JPH09303282A - Drain pump for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an impact noise of water in a pump body and a backflow noise to be produced during the rotation and stoppage of a moving blade from leaking outside to generate noise. SOLUTION: A pump case 3 is made up of a body part 11a having an inner circumferential surface whose diameter is gradually increased, and being opened at the upper end, and an outer case 9 provided with a discharge port part 13 hanging down in a level higher than a pump body 11 and interconnecting an upper part of the body part upwards, and a drainage passage 15 extending over the vertical direction. A motor storage case 5 is formed by way of installing a bootom face plate 5b with a through hole 5c in the central part and a rising partition wall 5h in the inner part respectively, after covering the pump case. A moving blade 25 being integrally formed in a boss part 25a, and provided with a curved blade part 25c hanging down as twisting along the inner circumference of a cylinder part is attached to a turning shaft 23b if an electric motor 23 projecting from the through hole 5c. In addition, a hanging partition wall 7a holding the electric motor between in conjunction with the rising partition wall 5h and a cover case 7 provided with a setting part upwards are attached to a top opening of the motor storage case 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 for an air conditioner for pumping up drain accumulated in a drain pan of the air conditioner.

[0002]

The present applicant has found that
As shown in JP-A-38385, a pump main body is formed from a cylindrical portion having a predetermined height at a lower portion and a main body portion having an inner peripheral surface whose diameter gradually increases upward at an upper portion of the cylindrical portion. At the same time, a rotary vane was formed at the lower part of the shaft while being twisted in the hollow part of the cylindrical part while being twisted, and a vane part which was located inside the main body part and was continuous with the curved vane, and the drain reached the lower end part of the pump main body. At this time, after the drain is pumped up into the main body by the curved blades inside the cylinder that rotates with the drive of the electric motor, centrifugal force is applied to the pumped drain by the rotating blades and the drain is discharged from the upper discharge port. A drain pump for an air conditioner was proposed.

In the above-described drain pump for an air conditioner, since a gap for inserting the drive shaft is formed in the cover that covers the upper opening of the pump body, when the drain pump is rotationally driven, water against the inner surface of the pump body The collision sound of
Further, there is a problem that the returning sound of water flowing back into the pump body from the discharge pipe becomes noise when the drain pump is stopped. In particular, an air conditioner mounted on a ceiling in a room is required to have high quietness, but it is difficult to achieve the quietness required by the noise.

Further, in the electric motor for rotating the rotary blade, it is necessary to form the bearing portion of the bracket for rotatably supporting the rotary shaft with high accuracy to prevent dust and water from entering the inside of the motor. However, this has been a factor in increasing the cost of the electric motor itself.

Further, the drain pump is provided with a mounting bracket, and is fixed to the drain pan or the equipment of the air conditioner through the mounting bracket. For this reason, after assembling the drain pump, it is necessary to further attach other parts such as a mounting bracket, which increases the number of drain pump assembly work steps and increases the cost of the drain pump itself.

The present invention has been invented in order to solve the above-mentioned conventional drawbacks, and the problems to be solved are the collision noise of water in the pump body and the reverse flow of water generated when the rotation of the rotary blades is stopped. An object of the present invention is to provide a drain pump for an air conditioner, which can prevent sound from leaking outside and becoming noise.

Another object of the present invention is to provide a drain pump for an air conditioner which can simplify the structure of an electric motor for rotating a rotary blade and reduce the cost.

Still another object of the present invention is to provide a drain pump for an air conditioner which can be directly attached to the drain pan without providing any other member and which can reduce the cost.

[0009]

Therefore, according to the present invention, an inner peripheral surface having a constant diameter is provided at the main body portion having an inner peripheral surface of which the diameter is gradually increased and the upper end is open, and the lower central portion of the main body portion. A pump body in which a cylindrical portion having a surface is formed at a predetermined height and a pump body which is continuous at the upper portion of the pump body and hangs at a height higher than that of the pump body while covering the outside, and communicates with the upper portion of the body portion at the upper portion. A pump case consisting of an outlet case and an outer case having a drainage passage extending in the vertical direction, and a motor housing case in which a bottom plate that covers the pump case and has a through hole in the center and an upright partition wall are integrally formed inside And an electric motor having a rotary shaft inserted through the through hole in the motor housing case, and a boss portion that is fitted into the rotary shaft of the electric motor protruding from the through hole, and is integrally formed with the inner periphery of the main body. Multiple wings with shapes facing each other And a rotary blade integrally formed on the lower part of the blade portion and the blade portion and integrally formed with a curved blade portion that hangs down while twisting along the inner circumference of the cylindrical portion, and covers the upper opening of the motor housing case to which the electric motor is attached, Further, a drain pump for an air conditioner is constituted by a hanging partition wall for sandwiching an electric motor by an upright partition wall and a lid case having an attachment portion at an upper part thereof.

Then, the drain pump is attached to the air conditioner or a part of the drain pan via the mounting portion. When the drain in the drain pan reaches the water level in contact with the lower end of the curved blade, the drain in the cylindrical portion is pumped up into the main body by the curved blade rotating with the drive of the electric motor, and centrifugal force is applied by the rotating blade. Is discharged from the discharge port. At this time, a draining sound is generated in the cylindrical portion and a drain collision sound is generated in the main body portion, but the pump body is blocked by the outer case submerged in the drain and the through hole is blocked by the motor housing case. Therefore, the noise is prevented from leaking outside, and the noise is reduced.

Further, when the drive of the electric motor is stopped, the drain in the discharge pipe flows back into the pump main body, and a part overflows from the through hole into the motor accommodating case, but the overflowed drain is accommodated in the motor. It is returned to the inside of the drain pan via the drainage passage communicating with the case. At this time, noise is generated due to the reverse flow of the drain, but this noise is blocked by the motor housing case and the drainage passage submerged in the drain,
It is designed to prevent noise from leaking out and reduce noise.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a central longitudinal sectional view of a drain pump for an air conditioner.

FIG. 2 is a partially exploded perspective view of a drain pump for an air conditioner.

FIG. 3 is a partially exploded perspective view of a drain pump for an air conditioner.

FIG. 4 is a vertical sectional view of a support shaft to which the float is attached.

The case of the air conditioner drain pump 1 comprises a pump case 3, a motor housing case 5, and a lid case 7.

The pump case 3 has a structure in which a pump body 11 is integrally formed in an outer case 9 having a substantially rectangular tube shape so that the upper part thereof is connected. The pump body 11 has a height slightly lower than that of the outer case 9, and an upper body portion 11a and a lower cylindrical portion 11b are integrally formed. The body portion 11a is formed in a substantially hemispherical shape whose diameter gradually increases from the lower side to the upper side, and the cylindrical portion 11b hangs down from the lower central portion of the body portion 11a with a constant diameter and communicates with the inside. It is formed to have a surface. And the cylindrical portion 11
The lower end of b is a suction port.

Further, the through hole 1 is formed in the upper portion of one side surface of the outer case 9.
The discharge port portion 13 having 3a is integrally formed so as to communicate with the inside of the main body portion 11a. The axis of the discharge port portion 13 is relative to the radial direction of the main body portion 11a, and the rotary blade 2 described later
5 is formed so as to be slightly inclined in the rotation direction.
Further, the through hole 13a of the discharge port portion 13 is formed to have a small diameter on the main body portion 11a side and a large diameter on the outer side.

Further, the outer case 9 on the side opposite to the discharge port portion 13
On the other side surface, a substantially half-divided cylindrical drainage passage 15 is formed over the entire vertical direction. A connection port 15a is provided at an upper portion of the drainage passage 15 so as to slightly project from the upper end surface of the outer case 9 and communicate with an opening 5e of the motor housing case 5 described later.

Furthermore, the outer case 9 and the pump main body 11
A protrusion 3b is formed on the upper surface plate 3a of the pump case 3 that connects the upper portions of the above, around the upper opening of the main body 11a.

On the other hand, the motor accommodating case 5 is formed such that the lower part thereof has a size substantially corresponding to the outer case 9 and the accommodating part 5a is integrally formed in the upper part on the discharge port 13 side so as to bulge laterally. Has been done. A through hole 5c is formed in a central portion of a bottom plate 5b that closes the lower surface of the motor housing case 5 to allow a boss portion 25a of a rotary blade 25, which will be described later, to be inserted with a gap. A recess 5d is formed on the lower surface of the bottom plate 5b so as to be able to engage with the projection 3b, and an elastic hermetic material 17 is inserted into the recess 5d.

The bottom plate 5 located on the center side of the recess 5d.
The lower surface of b is formed into a curved surface that bulges upward.

An opening 5e is formed in the lower side surface of the motor housing case 5 on the side of the drainage passage 15 so as to have a size substantially corresponding to the connection port portion 15a, and is closed in the motor housing case 5 located above the opening 5e. The plate 5f is integrally formed so as to close the upper end opening of the connection opening 15a.

A cutout portion 5g is formed on the bottom plate 5b on the side of the storage portion 5a.
The standing partition wall 5h having the above is integrally formed so as to partition the inside of the motor housing case 5. Further, a plurality of slits 5i are formed on the lower surface and the side surface of the housing portion 5a. Further, on the lower surface side of the accommodation portion 5a, there is an axis line in the vertical direction,
A support shaft 5j is integrally formed as a float switch mounting portion whose lower end extends almost to the lower part of the pump case 3, and a part of the float switch having a magnet 19b mounted on its inner peripheral surface is formed on the support shaft 5j. The constituent float 19 is movable in the axial direction, and is attached so as to be prevented from coming off by a lower stopper 21. And the support shaft 5j
A float switch 19a such as a reed switch or a hall element is provided in the upper hollow part of the float switch 19a. When the drive of the electric motor 23 described later is stopped, for example, when the drive of the air conditioner is stopped, the float switch 19a is stopped. When the drain inside the discharge pipe 35, which will be described later, is returned to the inside of the drain pan and its water level rises, the magnet 19b of the float 19 that moves the support shaft 5j upward is turned on to operate the electric motor 2
By driving 3 for a predetermined time, the drain is prevented from overflowing from the drain pan 27.

An electric motor 23 is housed in the motor housing case 5. The electric motor 23 has a coil portion 2
3a, and an iron core portion 23c that rotatably accommodates and supports a rotor having a rotating shaft 23b having an axis in the vertical direction. The electric motor 23 is housed in the motor housing case 5 with the coil portion 23a positioned in the housing portion 5a and the iron core portion 23c engaged with the cutout portion 5g of the standing partition wall 5h. It When the electric motor 23 is housed in the motor housing case 5, the rotary shaft 23b of the electric motor 23 is positioned so as to substantially coincide with the center of the through hole 5c.

A rotary blade 25 is attached to the lower end of the rotary shaft 23b protruding from the through hole 5c of the bottom plate 5b. The rotary blade 25 includes a boss 25a that is fitted into the rotary shaft 23b,
At the equally divided position of the boss 25a, the tips of the blades 25b extend in the radial direction, and the tips of the blades 25b face each other with a gap on the inner peripheral surface of the body 11a, and the lower center of the blades 25b. A curved blade portion 25c is integrally formed along the inner peripheral surface of the cylindrical portion 11b and hangs while twisting in a required direction.
In addition, reference numeral 25d in the drawing denotes the rotary shaft 23b above the boss 25a.
It is a draining board attached to.

The lid case 7 has a shape that can be inserted into the upper portion of the motor housing case 5, and a hanging partition wall 7a having a notch portion 7b is integrally formed inside the lid case 7 so as to face the standing partition wall 5h.
Further, a mounting portion 7c is integrally formed on the upper surface of the lid case 7, and the assembled drain pump 1 for an air conditioner has a fixing screw for inserting a through hole 7d of the mounting portion 7c into a part of the air conditioner or the drain pan 27. It is fixed by (not shown).

The pump case 3 and the motor housing case 5
Is a through hole 3c formed in the upper surface plate 3a on the drainage passage 15 side.
A fixing screw 29 for inserting the screw is fixed to a boss portion (not shown) formed in the motor housing case 5 by screwing.
Further, the pump case 3, the motor housing case 5, and the lid case 7 have a through hole 3d formed in the upper surface plate 3a on the discharge port 13 side.
A fixing screw (not shown) for inserting a fixing screw 31 for inserting a fixing screw 31 and a through hole (not shown) formed on the accommodation portion 5a side of the motor accommodating case 5 into a boss portion (either (Not shown) are also screwed and fixed.

Next, a method for assembling the air conditioner drain pump 1 will be described.

First, the iron core portion 23c of the electric motor 23 is inserted into the motor housing case 5 and the cutout portion 5g of the standing partition wall 5h is formed.
And the electric motor 23 is attached. At this time, the coil portion 23a of the electric motor 23 is housed in the housing portion 5a, and the lower end portion of the rotating shaft 23b is inserted into the through hole 5c.

Then, the rotary shaft 23b which passes through the accommodating portion 5a
On the other hand, with the draining plate 25d inserted, the rotary blade 25
The boss 25a is inserted and fitted. At this time, boss 25
A gap is provided between the outer peripheral surface of a and the inner peripheral surface of the through hole 5c.

As described above, the pump case 3 is engaged with the motor mounting case 5 to which the electric motor 23 and the rotary vanes 25 are attached, the projection 3b is engaged with the recess 5d, and the opening 5e and the opening are closed at the connection port 15a. The plates 5f are attached while being aligned with each other. At this time, the blade portion 2 of the rotary blade 25
5b is rotatably housed in the main body portion 11a of the pump main body 11, and the curved blade portion 25c is rotatably housed in the cylindrical portion 11b. Then, in the above state, the fixing screw 2 which is inserted through the through hole 3c
The pump case 3 and the motor housing case 5 are fixed to each other by screwing 9 to the boss portion.

Next, the lid case 7 is attached to the upper part of the motor housing case 5 to which the pump case 3 is fixed, and the hanging partition wall 7
The iron core portion 23c of the electric motor 23 is engaged and attached to the notch portion 7b of a. At this time, the coil portion 23a of the electric motor 23 is accommodated in the housing portion 5 by the standing partition wall 5h and the hanging partition wall 7a.
It is accommodated in a in an isolated state. Then, the fixing screw 31 for inserting the through hole 3d and the fixing screw for inserting the through hole are respectively screwed to the opposing boss portions to fix the lid case 7 to the pump case 3 and the motor housing case 5.

Next, after connecting the discharge pipe 35 rising to a height of, for example, 300 to 600 mm to the discharge port portion 13 of the assembled air conditioner drain pump 1, the drain pan 2 is connected.
It is directly fixed to 7 by a mounting screw (not shown, a rubber bush may be mounted in the through hole 7d if necessary) which passes through the through hole 7d of the mounting portion 7c. At this time,
The distance between the lower end of the cylindrical portion 11b and the bottom surface of the drain pan 27 is set to a predetermined distance of about 10 mm, for example.

Next, the operation of the air conditioner drain pump 1 will be described.

FIG. 5 is a vertical sectional view showing a discharge state.

FIG. 6 is a vertical sectional view showing the drain return state when the pump is stopped.

Electric motor 2 of air conditioner drain pump 1
3 may be driven in conjunction with power ON / OFF operation of the air conditioner, or may be intermittently driven at fixed time intervals after the power ON operation of the air conditioner, and is not limited to the operating state, but In the explanation of, the power of the air conditioner is turned on-
The operation mode is such that the electric motor 23 is driven in association with the OFF operation.

When the electric motor 23 is driven to rotate in accordance with the power-on operation of the air conditioner (not shown), the rotary blades 25
The blade portion 25b and the curved blade portion 25c are rotated in a predetermined direction. Then, when the drainage generated by the dehumidifying function of the air conditioner is accumulated in the drain pan 27 and the water level reaches the curved blade portion 25c, the drainage is removed as shown in FIG.
The main body portion 11 is formed by the curved blade portion 25c that rotates in 1b.
A centrifugal force is applied by the vane portion 25b that rotates after being pumped into the inside a to eject from the ejection port portion 13. At this time,
Since the height of the outer case 9 is set to be higher than that of the pump body 11 and the lower end of the outer case 9 is submerged in the drain, the pumping sound generated by the curved blade portion 25c generated in the cylindrical portion 11b is generated in the outer case 9 and the drain. To prevent leakage to the outside.

Further, the drain to which the centrifugal force is applied by the blade portion 25b produces an impact sound due to the collision with the inner surface of the main body portion 11a, but is blocked by the pump case 3 itself, the outer case 9 and the motor housing case 5. Therefore, the impact sound is prevented from leaking to the outside through the through hole 5c.

Further, the electric motor 23 itself and the rotating shaft 23b
A drive sound is generated in the iron core portion 23c due to the rotation of the electric motor 23. However, since the electric motor 23 itself is housed and shielded in the motor housing case 5, the drive sound is prevented from leaking to the outside. ing. This reduces noise when the air conditioning drain pump 1 is driven.

On the other hand, when the drive of the electric motor 23 is interrupted in conjunction with the operation of turning off the power of the air conditioner, the drain in the discharge pipe 35 during the pumping into the pump body 11 due to gravity as shown in FIG. Returned, part of which is cylindrical part 11
From the lower end opening of b into the drain pan 27, and partly through hole 5
It overflows from the pump case 3 via c and generates backflow noise. At this time, the drain overflowing from the through hole 5c is returned to the drain pan 27 through the opening 5e and the drainage passage 15 while being rectified by the draining plate 25d so as to avoid adhesion to the electric motor 23. Further, the noise generated by the reverse flow of the drain is blocked by the outer case 9 submerged in the drain and the motor housing case 5 covering the through hole 5c, and is prevented from leaking to the outside.

Further, since the electric motor 23 is covered by the motor housing case 5, it is possible to prevent dust and the like from adhering to the electric motor 23, particularly the iron core portion 23c, and it is excellent in durability.

[0045]

Therefore, according to the present invention, it is possible to prevent the collision noise of water in the pump main body and the backflow noise of water generated when the rotation of the rotary blades is stopped from leaking to the outside and generating noise. Further, according to the present invention, the structure of the electric motor for rotating the rotary blade can be simplified and the cost can be reduced. Further, the present invention provides
It can be directly attached to the drain pan without providing other members, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a central vertical cross-sectional view of a drain pump for an air conditioner.

FIG. 2 is a partially exploded perspective view of a drain pump for an air conditioner.

FIG. 3 is a partially exploded perspective view of a drain pump for an air conditioner.

FIG. 4 is a vertical sectional view of a support shaft to which a float is attached.

FIG. 5 is a vertical sectional view showing a discharge state.

FIG. 6 is a vertical sectional view showing a drain return state when the pump is stopped.

[Explanation of symbols]

1 Drain pumps for air conditioners, 3 pump cases, 5
Motor housing case, 5h standing partition, 7 lid case, 7a
Hanging partition wall, 7c mounting portion, 9 outer case, 11 pump body, 11a body portion, 11b cylindrical portion, 13 discharge port, 15 drainage passage, 23 electric motor, 25 rotating blades, 25a boss portion, 25b blade portion, 25c curved blade Department, 27 drain pans

Claims (5)

[Claims] 1. A cylindrical portion having an inner peripheral surface of which the diameter gradually increases and having an inner peripheral surface of a constant diameter at a main body portion having an open upper end and a lower central portion of the main body portion at a predetermined height. The formed pump main body and the upper part of the pump main body hang down at a height higher than that of the pump main body while covering the outside and have a discharge port communicating with the upper part of the main body and a drain passage extending in the vertical direction at the upper part. A pump case with an integrally formed outer case,
A motor housing case that covers the pump case and has a bottom plate having a through hole in the center and an upright partition wall integrally formed therein; And a plurality of vanes and a lower portion of the vanes, which are integrally formed on a boss portion that is fitted into the rotation shaft of the electric motor protruding from the through hole and have a shape facing the inner peripheral surface of the main body portion, A rotating blade integrally formed with a curved blade portion that hangs down while twisting along the inner circumference of the cylindrical portion,
A drain pump for an air conditioner, comprising: a hanging partition wall which covers an upper surface opening of a motor housing case to which an electric motor is mounted, and which holds an electric motor by a standing partition wall, and a lid case which has a mounting portion on an upper portion. 2. A drain pump for an air conditioner according to claim 1, wherein one of the standing partition wall of the motor housing case and the hanging partition wall of the lid case is provided with a cutout portion for engaging and positioning a part of the electric motor. . 3. The drainage passage according to claim 1, wherein the drainage passage communicates with a cylindrical portion having a length extending in a vertical direction on a side surface of the outer case, and an opening provided at a lower end portion of the motor housing case at an upper portion of the cylindrical portion. A drain pump for an air conditioner having a connection part. 4. The positioning according to claim 1, wherein a protrusion is formed around an opening in the pump case that connects the pump body and the outer case, and a recess is provided in the bottom surface of the bottom face plate of the motor housing case facing the protrusion. Drain pump for air conditioner made possible. 5. The drain pump for an air conditioner according to claim 1, wherein the float switch mounting portion is integrally formed on at least one of the pump case, the motor housing case, and the lid case.