JPH0783460A - Drain pump - Google Patents

Abstract

PURPOSE:To contrive the improvement of drain pump performance by a method wherein the discharge opening of a casing is so designed as to increase the discharging capacity of the drain pump. CONSTITUTION:In a drain pump having a blade 5 housed in a casing 1 consisting of a peripheral side wall 2 and a top lid 3 and made into the shape of an inverted truncated cone, with its axis set vertically and in a rotary manner, and having a suction opening 6 formed in the lower surface of the peripheral side wall 2 of the casing and a discharge opening 7 formed in the upper part thereof, the discharge opening 7 in the upper part of the peripheral side wall 2 has the axis of its opening directed in an oblique and upward direction and is eccentrically disposed on a tangent to the rotating direction of the blade 5.

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 as a central suction grill 12 having a filter 13 in a unit casing 11 and an outlet grill 17 outside the central suction grill 12. A drain pan 18 for accommodating a fan 15 and a heat exchanger 16 which are rotated by a motor 14 inside and a drain water 18 for accommodating drain water generated in the heat exchanger 16, and a drain pump P on the drain pan 18. It is configured to suck in water and drain it to the outside of the machine through the in-machine drainage hose 19 and the outside discharge port 20.

As a drain pump P arranged on the drain pan 18 in the above-mentioned air conditioner, a pump having a structure as shown in FIG. 3 is conventionally disclosed in Japanese Utility Model Laid-Open No. 4-127887. It is used.

That is, the structure is as shown in FIGS.
As shown in (c), a casing 4 having an inverted truncated cone shape consisting of a peripheral side wall 2 and a canopy 3 is connected to a motor 4 and a small blade 2 to 4 blades 5 are connected to the inner surface of the casing 1 with a gap therebetween. It is built in so that it can be rotated vertically, and the suction port 6 is formed on the small diameter side of the casing 1, and the discharge port 7 is formed on the side surface of the large diameter side in the lateral direction. The drain thus formed balances with the atmospheric pressure of the air introduced from above the casing canopy 3, and is discharged from the discharge port 7 in the lateral direction by the velocity component given by the rotation of the blade 5.

[0005]

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

As a result, in order to improve the performance of the pump, improvements are made such as increasing the output of the motor, increasing the outer dimensions of the blade housing, or narrowing the gap between the blade and the casing. Each had problems in that it became difficult to store them, and the durability deteriorated.

In view of the above-mentioned circumstances, the present invention improves the drainage capacity by modifying the casing discharge port without changing the output of the motor, the outer dimensions of the casing and the blade, etc. The purpose is to improve.

[0008]

In order to achieve the above object, the present invention firstly changes the opening direction of the discharge port, and
In the described drain pan, as shown in FIG. 1, a blade 5 is connected to a motor 4 and is rotatably stored with an axis line vertical, in a casing 1 having an inverted truncated cone shape composed of a peripheral side wall 2 and a canopy 3. In the drain pump in which the suction port 6 is provided on the lower surface of the casing peripheral side wall 2 and the discharge port 7 is provided on the upper side, the opening direction of the discharge port 7 on the upper side of the peripheral side wall 2 is formed with its central axis direction directed obliquely upward.

Further, in the drain pan according to the second aspect, 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 set to the blade as shown in FIG. It was formed so as to be eccentrically located on the tangential line of the rotational direction of 5, and the central axis line direction of the opening was directed obliquely upward.

[0010]

With the above configuration, the drain is sucked up 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 introduced into the casing 1. Therefore, the drain that has risen in the casing 1 is discharged from the discharge port 7 while keeping the drain liquid level in the upper part of the casing 1 by balancing with the atmospheric pressure of the air introduced from above, but at this time, it rises in the casing 1. Since the drainage having a spiral shape is rotated and rises, the discharge port 7 directed obliquely upward reduces the resistance to the flow direction of the drain due to the inclination angle thereof, thus improving the drainage capacity of the drain pump.

According to the second aspect of the present invention, the tangential centrifugal force of the drain that is rotated and raised acts together with the action of the inclination of the discharge port 7 obliquely upward, and the synergistic action of both increases the drainage capacity. Up.

[0012]

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

FIG. 1 shows a first embodiment of the present invention according to claim 1, wherein a casing 1 having an inverted truncated cone shape consisting of a peripheral side wall 2 and a canopy 3 is connected to a motor 4 to form the casing 1.
On the other hand, an appropriate number of blades having a small diameter, for example, two to four blades 5 are rotatably built in with the axis line vertical, and a suction port 6 is provided on the lower surface of the casing peripheral side wall 2 while the peripheral side wall 2 is provided. Discharge ports 7 are provided in the upper part, respectively. In addition,
Here, the casing 1 generally has an inverted truncated cone shape,
The same effect polygonal pyramid shape is also included.

In the above-mentioned structure, the discharge port 7 of the present invention is provided so that the central axis of the opening thereof is inclined upward with respect to the horizontal plane position which horizontally traverses the peripheral side wall 2 and is directed upward. The inclination angle θ is θ = α + (5 ° ± 5 with respect to the inclination angle α of the end plate 5a of the blade 5.
°) and θ ≧ 5 °.

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

If the above-mentioned ranges are not satisfied and the upward inclination angle θ is large or small, the former is more susceptible to the lower side of the inner wall of the discharge port, while the latter is more susceptible to the upper side of the inner wall of the discharge port. As a result, the 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 comprises the upwardly inclined discharge port 7 structure shown in FIG. 1 and can be further seen in the plan view of FIG. 2 (a). In addition, the extending position of the discharge port 7 is the blade 5 in the casing 1.
Therefore, the suctioned drain is smoothly discharged from the discharge port 7 with a strong energy by the centrifugal force accompanying the rotation of the blade 5, and the drain hose 19 (Fig. 5). (Refer to FIG. 3) and rises and is discharged from the discharge port 20 outside the machine.

FIG. 4 compares the performance of the drain pumps (A), (A ₁ ), (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 figure, (A) is a drain pump according to claim 1 with θ of 15 °, and (A ₁ ) is also claim 1.
The drain pump according to the present invention has θ of 8 °, and the drain pump according to claim 2 has θ of 15 °.

As shown in the figure, the second embodiment in which the upward inclination and the tangential eccentricity are simultaneously given to the discharge port 7 (B)
Shows the best characteristic curve, and it is understood that those given only the upward inclination (A) and (A ₁ ) have a sufficiently increased drainage capacity as compared with the conventional drain pump.

[0021]

As described above, in the drain pump of the present invention, the drain sucked up from the suction port is directed in the drain flow direction in which the blade is rotated by tilting the discharge port on the upper side wall of the casing upward at the required angle. In response, resistance can be reduced, the flow can be smoothed, and drainage capacity can be increased.

Further, in the drain pump according to the second aspect, since the discharge port is arranged eccentrically on the tangent line in the rotation direction of the blade, the centrifugal energy of the flow of the drain accompanying the rotation of the blade can be utilized. In addition to the above effects, it has a remarkable effect of further improving the drainage capacity of the pump.

[Brief description of drawings]

FIG. 1 shows a drain pump according to a first embodiment of the present invention, (a) is a schematic sectional view, and (b) is a side view.

2A and 2B show a drain pump according to a second embodiment of the present invention, FIG. 2A is a plan view, FIG. 2B is a schematic cross-sectional view partially broken, and FIG.

FIG. 3 shows an example of a conventional drain pump, (a) is a plan view, (b) is a schematic sectional view, and (c) is a side view.

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

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

[Explanation of symbols]

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

Claims (2)

[Claims] 1. A lower surface of the casing side wall 2 in which a blade 5 is connected to a motor 4 and rotatably accommodates a blade 5 with its axis perpendicular to an inside of an inverted frustoconical casing 1 composed of a side wall 2 and a canopy 3. A drain pump having a suction port 6 and a discharge port 7 on an upper part thereof, wherein a direction of an opening center axis of the discharge port 7 on the peripheral side wall 2 is directed obliquely upward. 2. A lower surface of the casing peripheral side wall 2 in which a blade 5 is connected to a motor 4 and rotatably accommodates a blade 5 with its axis perpendicular to an inside of the casing 1 having an inverted truncated cone shape composed of a peripheral side wall 2 and a canopy 3. In a drain pump in which a suction port 6 and a discharge port 7 are provided in the upper part, the discharge port 7 in the upper part of the peripheral side wall 2 is eccentrically provided on a tangent line in the rotation direction of the blade 5, and the opening center axis direction is obliquely upward. The drain pump is characterized in that