JPH08285306A - Drain water discharging pump - Google Patents

Abstract

PURPOSE: To enable eliminating of sound sufficiently as generated when drain water is stirred by a blade during the operation of a drain water discharging pump and moreover, discharging of the water smoothly without jamming an atmospheric air pressure introduction port with water. CONSTITUTION: A lid body 8 having a silencing cover 19 erected thereon is provided on the top surface of a pump body 2 housing a blade 24 inside. An upper bracket 22 and a lower bracket 15 are arranged above and below a stator 18 of a motor 14 respectively while gaps 28 are provided respectively between the stator 18 and the upper bracket 22 and between the stator 18 and the lower bracket 15 to build a drain water discharging pump.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In general household and commercial air conditioners, the drain condenses and accumulates in the heat exchange portion of the indoor unit, so it is necessary to drain this drain to the outside of the room. I am using. Various types have been proposed as this drain water drainage pump,
The one shown in FIG. 3 is known as one of them.

The drain water drainage pump 51 has a pump body 52 and a lid 53 with an O-ring 54 and a set screw 55.
The blades 57 are mounted in the pump chamber 56 formed therebetween. A shaft 58 is protruded from an upper end portion of the blade 57 through an air introduction port 60 of the lid 53 and is fixed above the pump body 52.
It is directly connected to the shaft 58 of.

The motor 61 includes a rotor 62, a stator 63,
The motor coil 64 is provided, and when the motor coil 64 is energized, the shaft 58 supported by the upper oil-impregnated bearing 65 and the lower oil-impregnated bearing 66 is rotated, and the blades 57 are rotated at high speed. At this time, if the drain is accumulated above the lower end opening 67 in the drain pan where the lower end opening 67 of the pump body 52 is located, the drain 57 is rotated by the rotation of the blades 57 into the pump chamber 56 from the lower end opening 67. Is sucked up along the inner peripheral surface of the blade, and a large centrifugal force is applied by the blades 57,
The drain is converted from velocity energy into pressure energy, is discharged from the outlet 68, and is discharged to the outside of the room.

At this time, the drain water flow that swirls in the pump chamber 56 has a cross section with a free surface formed in the center because the outside air at atmospheric pressure is introduced into the center of the drain water flow from the upper air inlet 60. It becomes a parabolic drain water flow, and the lower end opening 6
It flows from 7 to the exit 68.

[0006] When the pump is stopped, a part of the water flow in the pump chamber 56 flowing back from the outlet 68 to the lower end opening 67 tries to move further upward along the wall surface of the pump chamber.
The air introduction port 60 is guided downward by the drainer 70 formed at the lower edge of the opening end. Further, a part of the water, which flows backward due to the discharge pressure that cannot be completely recovered and tries to rise on the outer periphery of the shaft 58, does not rise further into the motor 61 by the drain plate 71 provided on the shaft 58. .

[0007]

In the drain water drainage pump as described above, in order to form the free surface of the drain water flow in the pump chamber, it is necessary to introduce the atmospheric pressure into the central portion, and therefore the air introduction port is provided. Although it must be provided at the center of the upper part, the sound generated when the drain water is swirled by the rotation of the blades during the operation of the pump leaks from this air introduction port and causes noise in the room.

As a countermeasure, it has been proposed to provide a sound deadening box so as to cover the draining plate, communicate the lower end of the sound deadening box with the air inlet, and form a small hole in a part of the side wall of the sound deadening box. .

However, even if such a muffling box is used, noise is leaked from a small hole formed in a part of the side wall of the muffling box, so that it cannot be said to be sufficient. Also, if drain water is clogged in the small holes formed in the side wall of the muffling box, the circulation of the atmosphere is hindered, the free water surface is not formed in the pump, and the drain water may not be drained smoothly.

Therefore, according to the present invention, it is possible to sufficiently muffle the sound of the blades stirring the drain water during operation of the drain water drainage pump, and to smoothly drain water without clogging the atmospheric pressure inlet. It is an object of the present invention to provide a drain water drainage pump capable of

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a lid body in which a sound deadening cover is erected on the upper surface of a pump main body for accommodating blades, and is provided above and below a stator of a motor. A drain water drainage pump is provided in which a bracket and a lower bracket are provided, and a gap is provided between the stator and the upper bracket and between the stator and the lower bracket.

[0012]

Since the present invention is configured as described above, the noise generated when drain water is drained by the rotation of the blades inside the pump body is silenced by the muffler cover, and the air is provided on the lower bracket of the motor. When going out through the gaps provided between the introduction hole, the stator and the upper bracket, and the stator and the lower bracket, the sound is sufficiently damped in these passages. Air is guided into the pump chamber in the opposite direction to continue smooth drainage.

[0013]

Embodiments of the present invention will be described with reference to the drawings. The pump body 2 of the drain water drainage pump 1 is provided with a suction port 3 at the lower end, a discharge pipe 5 is provided on the upper side surface through a discharge port 4, and the upper surface is open. The lid body 8 is fixed by means of the set screw 7 via the, and thereby the pump chamber 9 is formed inside.

A drainer chamber 10 is formed at the center bottom of the lid body 8, and a drain water return port 11 is provided at the upper end thereof. The drain water return port 11 at the upper end of the drainer chamber has a drainer inclined downward. The edge portion 12 is formed. A sound deadening cover 13 extending upward is provided upright on the lid body 8. A lower bracket 15 of the motor 14 is fitted into an upper end opening of the sound deadening cover 13, and a lower surface of the lower bracket 15 and the drain water return port 1 are provided.
A sound deadening chamber 17 is formed between the sound absorbing chamber 17 and the bottom surface 16 formed around the center 1.

The motor 14 is provided with a rotor 19 which rotates in its stator 18, and a rotating shaft 20 fixed to the center of the rotor 19 is fitted on the stator and a lower oil-impregnated bearing 21 of the lower bracket 15. It is rotatably supported by an upper oil-impregnated bearing 23 of the bracket 22, and a vane 24 housed in the pump chamber 9 is fixed to the lower end thereof. Rotating shaft 2
At 0, a draining plate 25 is fixed to a portion located in the muffling chamber 17, and the backflow water when the pump is stopped is generated by the draining plate 2
The water in 5 is drained and dropped into the muffling room, and the bottom surface 16 of the muffling room 17 is inclined downward toward the drain water return port 11 side in the center. It flows down and is returned from the drain water return port 11 into the pump chamber.

A gap 26 is formed between the lower bracket 15 of the motor 14 and the stator 18. Further, one end of the lower bracket 15 is in the muffling chamber 17 and the other end is in the rotor 1.
An air introduction port 27 communicating with 9 is provided. A gap 28 is also provided between the upper bracket 22 and the stator 18. As a result, an atmospheric pressure introduction passage is formed in the pump chamber 9 through the gaps 26, 28, the gap between the inner surface of the stator 18 and the outer circumference of the rotor 19, the air introduction port 27 of the lower bracket, the muffling chamber 17, and the drain water return port 11. To be done.

In the above device, the drainage is attached to the heat exchanger of the indoor unit by the operation of the air conditioner, and is collected in the drain pan arranged below. When the drain is stored in the drain pan, the motor 14 is driven, the blades 24 are rotated via the rotary shaft 20, the water in the drain pan is sucked from the suction port 3 into the pump chamber 9, and the velocity energy is generated by the centrifugal force of the blades. The drain is given and rises along the inner surface of the pump chamber, and at that time, the velocity energy of the drain is converted into pressure energy by the external atmospheric pressure supplied to the central portion, and is pushed out from the discharge port 4 and passes through the discharge pipe 5 to the outside. Is discharged to. At this time, in the pump chamber 9, as described above, the stator 18 and the lower bracket 15 and the gap 26, and the stator 18 and the upper bracket 22 are provided.
, A gap between the inner surface of the stator 18 and the outer circumference of the rotor 19, an air inlet 27 of the lower bracket 15, a muffling chamber 17,
External pressure is surely introduced through the drain water return port 11,
The drain water drainage action is surely continued.

On the other hand, the noise generated by the water agitated by the vanes 24 rotating at high speed in the pump chamber 9 is
From the drain water return port 11 enters the muffling chamber 17 and is muffled,
Further, from the air inlet 27 of the lower bracket 15 to the rotor chamber 2
6 and is silenced through the gap between the rotor 19 and the inner surface of the stator 18, so that the noise leaking from the ventilation hole extending from the gap between the stator 18 and the lower bracket 15 and the gap 26 between the stator 18 and the upper bracket 22 to the outside. Is almost eliminated by the silencer effect in which sound waves are attenuated while hitting each member.

Lifting height 50 cm, voltage AC200V, 60H
Using the drain water drainage pump shown in FIG. 1 equipped with the induction motor 14 under the condition of z, the microphone is placed 50 cm above the starter.
Sound level meter (NA-29, manufactured by Rion Co., Ltd.)
The noise was measured at. As Comparative Example 1, noise was measured under the same conditions as in the drain water drainage pump shown in FIG. 1 in which a hole having a width of 4 mm was provided in the sound deadening cover. For comparison with these, noise was measured under the same conditions as in the example using the drain water drainage pump shown in FIG. 3 to obtain comparative example 2. The obtained measurement results are as shown in Table 1.

[0020]

[Table 1]

In Table 1, the equivalent noise level (Leq)
When the noise level changes with time, it means the noise level of a continuous normal sound having energy equal to this within the measurement time. As is clear from the results shown in Table 1, the drain water drainage pumps of the examples were less noisy than Comparative Examples 1 and 2.

When the drain water in the pump chamber 9 rises along the inner wall surface of the pump chamber, it reaches the upper end of the inner wall surface of the water draining chamber 10, is guided downward by the water draining edge 12, and is pumped again. Return to the room. Further, the return water when the pump is stopped is dropped into the muffling chamber 17 by the drain plate 25,
The inclined bottom surface 16 returns the water from the drain water return port 11 into the pump chamber. As a result, there is no drain water that goes above the draining plate 25 in the muffling chamber 17, and the air inlet 27 of the lower bracket 15 located above this is not blocked by the drain water, and the drain water does not reach the pump chamber. It does not hinder the introduction of atmospheric pressure.

As the air introduction port formed in the upper bracket, as shown in FIG. 2, an air introduction pipe 29 is formed in the lower bracket 15, whereby the muffling chamber 17 and the rotor chamber 26 are formed.
You may communicate with. Further, a bear removing coil induction motor, which is a type of a single-phase induction motor, is used as the motor 14, and the bear removing coil is formed between the upper and lower brackets 15 and 22 by a groove for the bear removing coil penetrating the stator 18. The gap may be used as the atmospheric pressure introducing passage.

[0024]

Since the present invention is constructed and operates as described above, the sound of the blades stirring the drain water during operation of the drain water drainage pump can be surely silenced by passing it through the rotor chamber. When the pump is stopped, the return water is returned to the lower side by the draining plate of the muffling chamber, and the drain water does not reach above it. Since water does not enter and drain water does not block the air inlet,
Drain water can be drained smoothly and continuously.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of Codes] 1 Drain water drainage pump 2 Pump body 3 Suction port 4 Discharge port 5 Discharge pipe 6 O-ring 7 Set screw 8 Lid body 9 Pump chamber 10 Drainage chamber 11 Drain water return port 12 Drain edge 13 Muting cover part 14 Motor 15 Lower Bracket 16 Bottom 17 Noise Suppression Chamber 18 Stator 19 Rotor 20 Rotating Shaft 21 Lower Oil Bearing 22 Upper Bracket 23 Upper Oil Bearing 24 Blade 25 Drain Plate 26 Gap 27 Air Inlet 28 Gap

Claims (4)

[Claims] 1. A lid body in which a sound deadening cover is erected on an upper surface of a pump main body for accommodating blades inside, an upper bracket and a lower bracket are respectively provided above and below a stator of a motor, and a stator, an upper bracket and a stator are provided. A drain water drainage pump characterized in that a gap is provided between the lower bracket and the lower bracket. 2. The drain water drainage pump according to claim 1, wherein the lower bracket is provided with an air introduction port communicating with the inside of the sound deadening cover. 3. The drain water drainage pump according to claim 1 or 2, wherein a drain water return port is provided inside the lid, and a drain water return inclined surface that is inclined downward toward the drain water return port is formed. . 4. The drain water drainage pump according to claim 1, 2 or 3, wherein a draining plate is fixed to a rotary shaft of a rotor of a motor having fixed blades.