JPH0643516Y2 - Drain pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a drain pump for discharging drain water of an air conditioner or the like.

<Prior Art> Conventionally, as a pump of this type, there is one as shown in FIG. 3, for example. To explain this, the suction port at the bottom
A casing 1 which is formed into a substantially hollow inverted conical shape by forming 101 and opening an upper part thereof and providing a discharge port 102 on one side thereof.
00, a plate-shaped rotating body 103 having a substantially inverted triangular shape arranged with a gap from the inner peripheral surface of the casing 100, and an annular convex portion 105 on the lower surface facing the upper end of the rotating body 103. Have
The cover 104 attached to the upper open end of the casing 100.
And the rotating shaft 10 of the rotating body 103 on the top of the cover 104.
A motor 1 that rotates the rotating body 103 in a direction perpendicular to 3a.
06 and the drive shaft 107 of the motor 106, the cover 104
Is rotatably pierced through and inserted into a protruding rotary shaft 103a, and the cover 104 is provided with an air circulation hole 108 for communicating the atmosphere with the inside of the casing 100.

Then, by driving the motor 106, the rotating body 103 rotates via the drive shaft 107, and this rotation causes the drain pan 109 to rotate.
The drain water 110 stored in the suction port 101 is sucked from the suction port 101, is pumped along the inner peripheral surface of the casing 100 by the centrifugal force, is discharged from the discharge port 102, and is discharged through the discharge pipe 111 to a desired head H (for example, It is pumped up to 500 mm) and discharged.

<Problems to be solved by the invention> However, in the case of the one configured as described above,
Since the pump is pumped up to the desired lift H, the drain water that has been pumped along the inner peripheral surface of the casing by the centrifugal force applied to the water and has not been discharged from the discharge port collides with the lower surface of the cover and has an annular convex portion. Since the water received by the water will fall downward, the drain water that has been lifted up will not be effectively discharged, and there is a problem that the volume efficiency will decrease.
Water that was not received by the annular convex portion leaks out through the air circulation hole, splashes water on the bearing and coil of the motor, rusts the rotating part, locks the rotation of the motor, and impairs the discharge function, There is a problem in that there is a risk of a burnout accident due to deterioration of insulation.

The present invention has been made in view of the above points, and its purpose is to improve the volumetric efficiency of drain water and prevent the drain water from leaking from the air flow passage without providing a special waterproof structure. In order to provide a communication between the atmosphere and the inside of the casing.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides an annular concave portion having a reverse L-shaped cross section, which is inclined toward the position of the discharge port, on the lower surface of the cover, The upper end of the rotating body is inclined along the inclined surface of the recess, and a slit-shaped groove extending in the axial direction is provided in the shaft hole of the rotating shaft of the rotating body to communicate the atmosphere with the inside of the casing. It is characterized by.

<Operation> Due to centrifugal force, the drain water that is pumped along the inner surface of the casing and that is not discharged from the discharge port and collides with the lower surface of the cover is along the inclined surface of the annular recess whose cross section is inverted V-shaped. It is moved by centrifugal force and discharged from the discharge port.

Moreover, the drain water that has not been moved to the discharge port due to the annular recess hits the outer periphery of the rotating shaft of the rotating body and falls, so that it is prevented from leaking to the upper portion of the cover.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, 1 has a suction port 2 formed at the lower end,
The casing is formed in an approximately hollow inverted conical shape by opening the upper portion and providing a discharge port 3 on one side thereof. The discharge port 3 has a rectangular shape extending in the circumferential direction of the casing 1 with the inlet side 3a having the same area as the diameter of the outlet side 3b. A flange 1a is provided around the upper open end of the casing 1, and a plurality of screw insertion holes 1b are provided in the flange 1a at, for example, equal positions. Reference numeral 5 denotes a cover which is attached to the upper open end of the casing 1 and which has a through hole 5a at the axial center position of the casing 1 and is provided with a flange of the casing 1.
A screw hole 5e is provided at a position facing the screw insertion hole 1b of 1a, and is fastened with a screw 7 via a packing 6. In addition, the lower surface of the cover 5 has a cross section composed of an annular projecting piece 5b provided concentrically around the periphery of the through hole 5a and an annular inclined surface 5c inclined toward the position of the discharge port 3. An annular concave portion 5d having an inverted V shape is formed.
Reference numeral 4 denotes a plate-shaped rotating body which is arranged in the pump chamber formed by the casing 1 and the cover 5 with a gap. As shown in FIG. 2, this has an inverted triangular shape along the inner peripheral surface of the casing 1, and the upper end edge is discharged along an annular recess 5d having an inverted V-shaped cross section provided on the lower surface of the cover 5. The flat blade 4a inclined toward the position of the outlet 3 and the cover 5
A rotary shaft 4b that rotatably penetrates the through hole 5a is integrally formed. The rotary shaft 4b is provided with a shaft hole 4c and a plurality of slit-shaped (4 in this example) grooves 4d communicating with the shaft hole 4c in the axial direction. Further, receiving projections 4e integrally formed on both sides of the blade 4a are provided so as to face the lower end surface of the rotating shaft 4b with a gap α therebetween and form a substantially inverted conical shape. Reference numeral 8 is a motor mounted on the upper surface of the cover 5 with the drive shaft 9 concentric with the rotary shaft 4b of the rotary body 4 in the vertical direction. The drive shaft 9 is inserted into the shaft hole 4c of the rotary shaft 4b by a fixing means such as press-fitting or adhering to rotate the rotating body 4. Further, the atmosphere and the inside of the casing 1 are slit-shaped grooves 4d axially provided along the drive shaft 9.
It is designed to communicate via.

Next, the operation will be described. When the motor 8 is driven with the tip of the rotating body 4 immersed in the drain water stored in the drain pan, the rotating body 4 rotates, and the drain water is sucked from the suction port 2 by the centrifugal force and the inner peripheral surface of the casing 1 is rotated. The water is pumped up along the line, discharged from the discharge port 3, and pumped up to the desired head through the discharge pipe.

At this time, the drain water, which is not discharged from the discharge port 3 and collides with the lower surface of the cover 5, is moved toward the discharge port 3 along the inclined surface 5c of the annular recess 5d provided on the lower surface of the cover 5 by the centrifugal force. Discharge from the discharge port 3. The drain water that has not moved toward the discharge port 3 is guided by the annular protrusion 5b and falls. Therefore, leakage of air from the flow passage due to the slit-shaped groove 4d provided in the shaft hole 4c of the rotary shaft 4b along the drive shaft 9 is prevented.

Further, even when the level of the drain water stored in the drain pan rises, when the drain water is pumped up, the drain water is provided with the inverted conical receiving projection 4e facing the lower end surface of the rotating shaft 4b through the gap α. It is received by the flow path and divided, and is discharged toward the inner peripheral surface of the casing 1 by the centrifugal force and discharged from the discharge port 3.
Leakage from 4d is blocked.

In this way, the drain water sucked from the suction port of the casing is pumped along the inner peripheral surface of the casing and discharged from the discharge port by the centrifugal force generated by the rotation of the rotating body, and is not discharged from the discharge port. Water that collides with the lower surface of the cover is also moved to the discharge port along the inclined surface and discharged,
The volume efficiency can be greatly improved as compared with the conventional one. Moreover, since the inlet side of the discharge port has a rectangular shape in the circumferential direction, the drain water can be discharged efficiently.

Now, immerse the tip of the rotating body in 4 mm drain water and lift the head to 500 mm.
When comparing the discharge flow rate from the discharge port between the present invention and the conventional one, it was confirmed that it was improved by about 50% and that the leakage of air from the flow passage according to the present invention hardly occurred. .

<Effect of the Invention> According to the present invention, an annular concave portion that is inclined toward the discharge port is provided on the lower surface of the cover attached to the upper opening end of the casing, and the upper end edge of the rotating body is discharged along the inclined surface. Since it is configured to incline toward the outlet, drain water pumped up by centrifugal force can also be discharged from the outlet by moving along the inclined surface even water that was not discharged from the outlet. Can be greatly improved.

Further, since the communication between the inside of the casing and the atmosphere is performed by the air flow passage formed by the slit-shaped groove provided in the axial direction of the rotating shaft of the rotating body in contact with the drive shaft of the motor, Even when the drain water is pumped up to a desired lift by being located closer to the axis, leakage of air from the flow passage can be prevented.

This does not require a special waterproof structure between the cover and the upper part of this cover to prevent water from locking the bearings and coils of the motor and causing a burnout accident due to insulation deterioration. It can be prevented, the number of parts can be reduced, each member can be molded with a resin material, etc., the assembly can be facilitated, the cost can be reduced, and the distance between the motor and the cover can be reduced. As a result, it is possible to reduce the height of the pump, which is a great advantage that it can contribute to downsizing and downsizing of equipment such as an air conditioner.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention in a sectional view of a main part,
FIG. 2 shows a rotating body, and FIG. 2 (a) is a front view,
FIG. 3B is a side view showing a part of it in cross section, FIG. 3C is a plan view, and FIG. 3 is a front view showing a cross section of a main part of a conventional example. 1: Casing, 2: Suction port, 3: Discharge port 4: Rotating body, 4a: Blade, 4b: Rotating shaft 4d: Slit-shaped groove, 4e: Receiving projection 5: Cover, 5b: Projection piece, 5c: Inclined Surface 5a: recess, 8: motor, 9: drive shaft

Claims (2)

[Scope of utility model registration request] 1. A substantially hollow inverted conical casing having a drain water suction port formed at the lower end and having an upper opening and a discharge port at one side of the opening end, and an upper opening end of the casing. A cover to be worn, a plate-like rotating body having a substantially inverted triangular shape provided with a gap from the inner peripheral surface of the casing, and a motor for rotating the rotating body positioned in a direction perpendicular to the rotation axis of the rotating body. A bottom surface of the cover is provided with an annular concave portion having an inverted L-shaped cross section that is inclined toward the position of the discharge port,
The upper edge of the plate-shaped rotating body is inclined toward the discharge port along the inclined surface of the annular concave portion, and a slit-shaped groove extending in the axial direction is formed in the shaft hole of the rotating shaft of the rotating body. A drain pump characterized in that it is provided so that the atmosphere communicates with the inside of the casing. 2. The drain pump according to claim 1, wherein the inlet side of the discharge port of the casing is formed in a rectangular shape extending in the circumferential direction.