JP3261821B2 - Drain pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pump used for drainage of an air conditioner.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an air conditioner embedded in a ceiling 21 or suspended from the ceiling is used for a central suction grill 12 having a filter 13 in a unit casing 11 and a blowing grill 17 on the outside thereof. And a drain pan 18 containing a fan 15 and a heat exchanger 16 that are rotated by a motor 14 therein and containing drain water generated in the heat exchanger 16, and a drain pump P disposed on the drain pan 18. It is configured so that water is sucked in and drained out of the machine through an in-machine drainage hose 19 and an outboard outlet 20.

As the drain pump P disposed on the drain pan 18 in the above-described air conditioner, a pump having a structure as shown in FIG. 3 as disclosed in Japanese Utility Model Laid-Open No. 4-128787 has conventionally been used. It is used.

That is, the structure is shown in FIGS.
As shown in FIG. 3C, two to four small blades 5 are connected to a motor 4 in an inverted truncated cone-shaped casing 1 composed of a peripheral side wall 2 and a canopy 3 and spaced apart from the inner surface of the casing 1 by an axis. A suction port 6 is formed on the small-diameter side of the casing 1 and a discharge port 7 is formed on the large-diameter side surface of the casing 1 in a lateral direction. The drain is balanced with the atmospheric pressure of the air introduced from above the casing canopy 3, and is discharged from the discharge port 7 in the horizontal direction by a speed component given by the rotation of the blade 5.

[0005]

By the way, with regard to the drain pump having the above structure, studies have been made to improve the performance of the pump in order to improve the efficiency of the air conditioner.

As a result, improvements such as increasing the output of the motor, increasing the outer dimension of the blade housing, or reducing the gap between the blade and the casing have been made to improve the performance of the pump. There were problems that storage became difficult and durability deteriorated, and this was an advantage and disadvantage.

In view of the above situation, the present invention does not change the output of the motor, the outer dimensions of the casing and the blade, etc., and improves the drainage capacity by modifying the casing discharge port while keeping the same, thereby improving the pump performance. The purpose of this is to improve the quality.

[0008]

In order to achieve the above object, the present invention firstly changes the opening direction of the discharge port. In the drain pan according to the first aspect, as shown in FIG. A motor 4 is provided in a casing 1 having an inverted truncated cone shape.
And the blade 5 is rotatably stored with the axis vertical, and a suction port 6,
In the drain pump provided respectively outlet 7 at the top, the opening direction of the peripheral side wall 2 an upper portion of the discharge port 7, is formed obliquely upward with respect to the horizontal plane position transverse to the central axis line direction of the peripheral side wall in the horizontal, the Upward tilt angle of blade 5
For the inclination angle α of the end plate 5a, θ = α + (5 °
± 5 °) and 20 ° ≧ θ ≧ 5 ° .

Further, in the drain pan according to the present invention, in addition to changing the opening direction of the discharge port 7, the position of the discharge port 7 with respect to the casing 1 is devised so that the position of the discharge port 7 is changed to a blade as shown in FIG. 5 and is positioned eccentrically on the tangent line in the rotation direction of 5, and its opening center axis direction is described above.
It is formed so as to be directed obliquely upward at the required upward inclination angle described in claim 1 .

[0010]

With the above construction, the drain is sucked into the casing 1 from the suction port 6 by the rotation of the blade 5 and rises. At the same time, although not shown, air is sucked from the upper canopy 3 side and is introduced into the casing 1. Then, the drain that has risen inside the casing 1 is discharged from the discharge port 7 while maintaining the drain liquid level in the upper part of the casing 1 by balancing with the atmospheric pressure of the air introduced from above. Since the discharged drain has a spiral shape and rotates upward, the obliquely upwardly directed discharge port 7 reduces the resistance in the flow direction of the drain due to the inclination angle, and thus increases the drainage capacity of the drain pump.

According to the second aspect of the present invention, a centrifugal force acts in the tangential direction of the drain which rotates upward together with the effect of imparting the discharge port 7 obliquely upward and the drainage ability is further increased by the synergistic action of the two. Up.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention according to the first aspect of the present invention, in which an inverted truncated cone-shaped casing 1 composed of a peripheral side wall 2 and a canopy 3 is connected to a motor 4 inside the casing 1.
An appropriate number, for example, two to four blades 5 having a slightly smaller diameter than that of the casing 5 are incorporated so as to be rotatable with their axes perpendicular to each other. Discharge ports 7 are provided in the upper part, respectively. In addition,
Here, the casing 1 generally has an inverted truncated cone shape,
It also includes the same polygonal pyramid shape.

In the above configuration, the discharge port 7 of the present invention is formed so as to have an upward central inclination that is slightly obliquely upward with respect to a horizontal plane position crossing the peripheral side wall 2. When the inclination angle θ is equal to the inclination angle α of the end plate 5a of the blade 5, θ = α + (5 ° ± 5
°) and θ ≧ 5 °.

Here, α is usually 0 to 10 °. Therefore, θ is preferably about θ ≦ 20 °.

If the upward inclination angle θ is out of the above ranges and the upward inclination angle θ is large or small, the former is more susceptible to resistance below the inner wall of the discharge port, while the latter is more susceptible to resistance above the inner wall of the discharge port. As a result, a smooth flow of discharge is hindered, which is not desirable.

FIG. 2 shows a second embodiment of the present invention according to claim 2, which has the upwardly inclined discharge port 7 structure shown in FIG. 1 and can be seen from the plan view of FIG. 2 (a). In addition, the extension position of the discharge port 7 is the blade 5 in the casing 1.
Therefore, the suctioned drain is smoothly and strongly discharged from the discharge port 7 by the centrifugal force accompanying the rotation of the blade 5 as the blade 5 rotates. ) And is discharged from the external discharge port 20.

FIG. 4 compares the performance of the drain pumps (A), (A ₁ ) and (B) according to the first and second embodiments of the present invention with the performance of the conventional drain pump C shown in FIG. It was done.

In the drawing, (A) is the drain pump according to the first aspect, wherein θ is 15 °, and (A ₁ ) is the same as the first aspect.
In the drain pump according to the first embodiment, θ is set to 8 °, and (B) is the drain pump according to the second embodiment, wherein θ is set to 15 °.

According to the table, the discharge port 7 is simultaneously inclined upward and tangentially eccentric to the second embodiment (B).
Shows the best characteristic curve, and it is understood that the pumps (A) and (A ₁ ) provided only with the upward inclination can sufficiently increase the drainage capacity as compared with the conventional drain pump.

[0021]

According to the drain pump of the present invention, as described above, the discharge port at the upper portion of the peripheral wall of the casing is inclined upward at a required angle so that the drain sucked up from the suction port flows in the drain flow direction rising by the rotation of the blade. Immediately, the resistance is reduced, the flow is smooth and the drainage capacity can be increased.

Further, in the drain pump according to the second aspect, the discharge port is disposed eccentrically on the tangent in the rotation direction of the blade, so that the centrifugal energy of the drain flow accompanying the rotation of the blade can be utilized. In addition to the above effects, the present invention has a remarkable effect of further increasing the drainage capacity of the pump.

[Brief description of the drawings]

FIGS. 1A and 1B show a drain pump according to a first embodiment of the present invention, wherein FIG. 1A is a schematic sectional view and FIG. 1B is a side view.

FIGS. 2A and 2B show a drain pump according to a second embodiment of the present invention, wherein FIG. 2A is a plan view, FIG.

3 (a) is a plan view, FIG. 3 (b) is a schematic sectional view, and FIG. 3 (c) is a side view.

FIG. 4 is a performance comparison chart between the drain pump according to the present invention and a conventional drain pump.

FIG. 5 is a partial explanatory view showing an arrangement configuration of a drain pump in the air conditioner.

[Explanation of symbols]

 Reference Signs List 1 casing 2 peripheral side wall 3 canopy 4 motor 5 blade 5a blade end plate 6 suction port 7 discharge port θ upward inclination angle of discharge port α angle of end plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-237228 (JP, A) JP-A-61-55532 (JP, A) Fully open Showa 61-116913 (JP, U) Really open Showa 57- 115993 (JP, U) Japanese Utility Model Showa 51-156502 (JP, U) Japanese Utility Model Showa 63-42890 (JP, U) Japanese Utility Model Utility Model 4-127887 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) F24F 1/00 361 F04D 1/14

Claims (2)

(57) [Claims] 1. An inverted truncated cone-shaped casing 1 comprising a peripheral side wall 2 and a canopy 3 connected to a motor 4 to store a blade 5 rotatably with its axis vertical and a lower surface of the casing peripheral side wall 2. In the drain pump provided with the suction port 6 and the discharge port 7 in the upper part, a horizontal plane horizontally crossing the peripheral wall in the direction of the central axis of the opening of the discharge port 7 in the upper part of the peripheral wall 2
The angle of inclination θ
Θ = α with respect to the inclination angle α of the end plate 5a of the arm 5
A drain pump characterized in that + (5 ° ± 5 °) and 20 ° ≧ θ ≧ 5 ° . 2. An inverted truncated cone-shaped casing 1 comprising a peripheral side wall 2 and a canopy 3 connected to a motor 4 to store a blade 5 rotatably with its axis vertical and a lower surface of the casing peripheral side wall 2. intake port 6, the drain pump provided respectively outlet 7 at the top, the with peripheral side wall 2 the upper part of providing the discharge port 7 eccentrically on a rotating direction of the tangent of the blade 5, the opening center axis direction peripheral sidewall Crosses horizontally
Upward tilt angle θ obliquely upward with respect to the horizontal plane position
With respect to the inclination angle α of the end plate 5a of the blade 5.
θ = α + (5 ° ± 5 °) and 20 ° ≧ θ ≧ 5 °
Drain pump, characterized in that it has.