JP2584335Y2 - Drain pump for air conditioner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an air conditioner for reducing the size and weight of a device for automatically draining condensed water stored in a drain pan (condensed water reservoir) of an air conditioner, and reducing maintenance work. It relates to a drain pump for a harmonic machine.

[0002]

2. Description of the Related Art The structure of a conventional drain pump is illustrated in FIG. 50 is a drain pan of an air conditioner not shown,
The condensed water 51 that has condensed and falls on the surface of the heat exchanger is temporarily stored. A drain pump 60 is composed of a pump 60A and a motor 60B for driving the pump 60A. Pump 6
0A accommodates a triangular plate-shaped impeller 62 coaxially in a funnel-shaped pump casing 61, and
The rotating shaft 63 of the motor 60B installed vertically is axially fitted in a shaft hole provided in the second boss 62a. The pump casing 61 has an upper surface opening sealed with a lid 64, a water suction port 65 provided at a bottom end, and a drainage port 66 provided at an upper side surface. The cover 64 has a shaft hole 64a through which the boss 62a is inserted. When the motor 60B is driven in a state where the water surface in the drain pan 50 has reached the water level blocking the water suction port 65, the water adhering to the lower end of the impeller 62 due to the high speed rotation of the impeller 62 by centrifugal force causes the impeller 6 to rotate.
It rises along 2 to reach the position of the drain 66 and is discharged outside the air conditioner.

[0003]

The above-mentioned drain pump is generally used for an air conditioner which is installed behind a ceiling and which is difficult to maintain and inspect. The drain pump under such use conditions has some problems to be improved as listed below. a) It is necessary to make the air conditioner installed in a narrow space above the ceiling as small as possible. However, the drain pump, which has a bulky outer shape due to its structure, prevents this miniaturization. b) If the drain pump absorbs a large amount of water, the water sucked up by the impeller 62 may rise to a position above the drain port 66 and overflow from the gap of the shaft hole 64a. In this case, dust floating on the surface of the condensed water 51 and mechanical lubricating oil pass through the gap and adhere to this portion. Then, when not in use during the off-season, the dust and oil film solidify and close the gap, so that the pump 60A does not easily absorb water or the load on the motor 60B increases. c) Even then, inspection and repair of the air conditioner installed above the ceiling is extremely troublesome. d) Since the pump 60A and the motor 60B are made separately and combined with each other, the number of parts and the number of assembling steps increase to increase the cost. Therefore, an object of the present invention is to provide an air conditioner that is as small as possible and has a simple structure, can be provided at a low cost, and eliminates the problem that the suction water of a pump overflows upward, thereby achieving maintenance-free operation. To provide a drain pump for the machine.

[0004]

In order to achieve the above object, a drain pump for an air conditioner according to the present invention has a substantially funnel shape, and has a water inlet at a lower end and a drain at an upper side surface. A pump A in which an impeller is housed in a pump casing provided is driven by a motor B.
The motor B has a rotor 4 made of synthetic resin containing magnetic powder in an inner space of a stator in which a stator coil 2 is concentrically embedded in a thick cylindrical stator casing 1 made of synthetic resin.
Is provided in an upper portion of the stator casing 1 in a cantilever support state, and an impeller 10 made of a synthetic resin and having an inverted triangular plate shape is integrally formed below the rotor 4. The open upper end of the pump casing 11 is joined and united with the open lower end of the stator casing 1. Then, a plurality of vents 13 for communicating the inside of the pump casing 11 with the atmosphere may be provided at the joining / joining portion.

[0005]

[Function] With the operation of the air conditioner, condensed water condensed on the surface of the heat exchanger drops and accumulates in the drain pan,
When the motor B is driven in a state where the water inlet of the pump A is immersed in the water surface of the condensed water, the impeller 10 rotates at high speed to suck up the condensed water by its centrifugal force and discharge it from the drain. This drain pump differs from the conventional one as shown in FIG. 8 in which the pump portion and its drive motor are separately formed, and the casings made of the synthetic resin of the motor B and the pump A are respectively provided in half. Made to be shared. Therefore, it can be made much more compact than the conventional one, and the number of parts and the number of assembly steps can be greatly reduced. Further, by assembling the rotating shaft 5 of the rotor 4 to the stator casing 1 in a cantilevered state and by molding the impeller 10 integrally with the rotor 4, the number of parts and the number of assembling steps can be greatly reduced. Further, even when an excessively large amount of condensed water containing dust and oil is sucked up, the condensed water overflows from the ventilation holes 13 provided at a plurality of locations, returns to the drain pan, and is contaminated with contaminated water as in the conventional case. The solid content closes the gap around the motor shaft and the exhaust port, so that there is no need to cause a problem of poor suction of condensed water and an increase in the load on the motor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the drain pump has a configuration in which a pump A is integrally mounted below a pump driving motor B which is installed with a rotating shaft oriented vertically. The water inlet provided at the lower end of the pump A touches the surface of the condensed water 51 accumulated in the drain pan 50 of the air conditioner (not shown).

The motor B uses a so-called molded motor in which a casing portion of the stator and a rotor are formed by casting synthetic resin, respectively, and the type of the motor is D.
It is a C brushless motor (DC non-commutator motor). The stator is formed in a vertically-oriented thick cylindrical shape, and has a form in which a stator coil 2 is embedded in a peripheral wall portion of a synthetic resin-made stator casing 1 whose top end face is closed.
Reference numeral 3 denotes a printed circuit board that controls driving of the motor, and is embedded in the resin layer in a state where it is mounted on the iron core of the stator coil 2. A bearing mounting hole 1a is provided at the center of the top end surface. An oil-impregnated bearing (bearing) 6 that cantileverly supports the rotating shaft 5 of the rotor 4 is fitted into the mounting hole 1a. The oil-impregnated bearing 6 is fixed in a retaining state by a retaining ring (not shown). 6a is an oil-containing packing layer made of felt or the like. A retaining ring 5a is fitted to the upper end of the rotating shaft 5 to prevent falling off.

The rotor 4 has the form shown in FIG. Reference numeral 7 denotes a cylindrical rotor main body, which is formed by casting a synthetic resin mixed with magnetic powder into a laminated iron core 8 and a rotating shaft 5.
Is buried in one. The rotor body 7 is magnetized in a predetermined magnetic pole arrangement state. The rotor body 7 has its rotating shaft 5
Is completely fitted into the inner space of the stator casing 1 in a state of being fitted to the oil-impregnated bearing 6. The impeller 10 of the pump A described below is integrally formed on the bottom surface of the rotor body 7. The impeller 10 is formed in a substantially inverted triangular thick plate shape, and the length of the upper side thereof is substantially equal to the diameter of the rotor body 7.

The pump A comprises an impeller 10 and a funnel-shaped pump casing 11 made of synthetic resin for accommodating the impeller 10. A water inlet 12 is provided at the lower end of the pump casing 11, and a flange 11a is provided around the periphery of the upper surface. The outer diameter of the flange portion 11a is equal to the outer diameter of the stator casing 1, and groove-shaped ventilation holes 13 are provided at four locations in the circumferential direction so that the inside of the pump casing 11 communicates with the atmosphere. In addition, a pipe-shaped drain port 14 is integrally formed at one location above the pump casing 11. A drain hose 15 is connected to the drain port 14. The pump casing 11 has four flanges 11a, as shown in FIG.
6 and is fastened and fixed to the bottom surface of the stator casing 1.

Next, the operation of the above configuration will be described. With the operation of the air conditioner, the water surface of the condensed water 51 that has condensed on the surface of the heat exchanger and has dropped and accumulated in the drain pan 50,
When the water inlet 12 of the pump A is closed, the motor B is driven and the impeller 10 rotates at a high speed. Then, the condensed water 51 in contact with the lower end of the inverted triangular impeller 10.
Rises so as to be sucked up by the centrifugal force, and is discharged out of the air conditioner from the drain port 14 through the drain hose 15. At this time, the air in the pump casing 11 is discharged to the outside through the vent 13.

As described above, the drain pump of the above embodiment has a structure in which the pump and its driving motor are separated from each other.
In contrast to the prior art shown in FIG.
Is made in a form in which each synthetic resin casing is shared on a half-by-half basis. And the rotating shaft 5 of the rotor 4 is
The impeller 10 is assembled integrally with the rotor 4 in a cantilevered state while being assembled to the stator casing 1.
Therefore, as apparent at a glance from a comparison between FIG. 1 and FIG. 8, the drain pump of this embodiment can be made extremely compact in external form as compared with the conventional one, and the height dimension is Almost halved. Further, since the structures of the motor B and the pump A are simplified, the number of parts and the number of assembly steps can be significantly reduced.

If a large amount of condensed water 51 containing dust and oil is sucked up and cannot be discharged only from the drain port 14, the condensed water 51 is removed from the upper motor B It can be recirculated toward the drain pan 50 from four vents 13 provided at the boundary between the pump A and the lower pump A. Therefore, as in the prior art, the solids contained in the overflowed contaminated condensed water closes the gap around the motor shaft and the exhaust port, resulting in poor suction of condensed water and an increase in motor load. There is no trouble.

FIGS. 4 to 6 show a second embodiment of the present invention. The main difference from the first embodiment lies in the position where the vent 13 is formed. That is, in this embodiment, the circulation path for the impregnated oil provided at a total of four locations
We use as 7. The vent 17 communicates with the inside of the pump casing 11 through a gap between the inner peripheral surface of the stator casing 1 and the outer peripheral surface of the rotor body 7. In the case of this drain pump, even if the amount of water absorbed by the pump A is too large, even if condensed water contaminated with dust or oil rises up to the gap between the stator casing 1 and the rotor body 7,
Since the surface of the gap is made of a smooth synthetic resin and has a sufficiently large area, there is no problem that dust and oil adhere to the gap and clog the gap.

FIG. 7 shows another embodiment of the rotor of the motor B. The rotor 4A has four blades such that an impeller 10A integrally formed on the lower surface is formed by combining two inverted triangular impellers 10 in a cross shape. However, the number of blades may be three or five or more.

In each of the above-mentioned structures, the object of the present invention can be achieved even if the design of the detailed structure is appropriately changed.
The stator casing 1 and the pump casing 11 may be integrally formed. In that case, the top surface of the stator casing 1 may be made separately and screwed or screwed to its main body in order to enable the rotor to be assembled. Further, the structure of the bearing 6 and the method of mounting the bearing 6 are not limited to those illustrated, and may be changed as appropriate.

[0016]

As is apparent from the above description, the drain pump for an air conditioner according to the present invention has the following practically excellent effects. (A) The pump and the molded motor for driving the pump are:
Since the plastic casings are each shared in a half-shape, the size and weight of the drain pump can be reduced, and the air conditioner installed in a narrow space behind the ceiling can be reduced accordingly. it can. (B) In addition to the common use of the casing, the impeller of the pump is formed integrally with the rotor of the motor, and the rotating shaft of the rotor is cantilevered by the bearing provided on the upper part of the stator casing. The required number of parts and the number of assembly steps can be greatly reduced. (C) Therefore, it can be made significantly smaller, lighter and cheaper than conventional ones. (D) Even when a large amount of condensed water mixed with dust and oil is temporarily sucked up, the condensed water is returned to the drain pan from a plurality of vents provided at a joint / union portion between the pump casing and the stator casing. Is done. Therefore, unlike the conventional ones, dust and oil adhering to the gaps in the bearing holes and the ventilation holes solidify when not in use during the off-season and close the openings, making it difficult for the pump to absorb water and reducing the load on the motor. The problem of increase is eliminated. (E) In other words, an air conditioner that is installed behind a narrow ceiling and that is extremely troublesome to inspect and repair can be made maintenance-free.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a perspective view of the rotor, same as above.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 5 is a plan view of the same.

FIG. 6 is a bottom view of the same.

FIG. 7 is a perspective view showing another embodiment of the rotor.

FIG. 8 is a diagram corresponding to FIG. 1, showing a conventional example.

[Explanation of symbols]

 Reference Signs List A pump B motor 1 stator casing 1a mounting hole 2 stator coil 3 printed circuit board 4, 4A rotor 5 rotating shaft 5a retaining ring 6 oil-impregnated bearing (bearing) 6a oil-impregnated packing 7 rotor body 8 laminated iron core 10, 10A impeller 11 pump casing 11a Flange part 12 Water suction port 13, 17 Vent port 14 Drain port 15 Drain hose 16 Set screw 60 Drain pump 60A Pump 60B Motor 61 Pump casing 62 Impeller 62a Boss 63 Rotating shaft 64 Cover 64a Shaft hole 65 Water suction port 66 Drain port

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 29/02 F04D 11/00 101

Claims (2)

(57) [Scope of request for utility model registration] 1. A pump A having a substantially funnel shape, a pump A having an impeller housed in a pump casing having a water supply port at a lower end and a drainage port at an upper side surface is driven by a motor B. The motor B includes a rotor 4 made of synthetic resin containing magnetic powder in an inner space of a stator in which a stator coil 2 is concentrically embedded in a thick cylindrical stator casing 1 made of synthetic resin.
Is provided in an upper portion of the stator casing 1 in a cantilevered support state. On the lower side of the rotor 4, an inverted triangular plate-shaped impeller 10 made of synthetic resin is integrally formed. A drain pump for an air conditioner, wherein an open upper end of a pump casing 11 is joined and united with an open lower end of the stator casing 1. 2. A plurality of vents 13 for connecting the inside of the pump casing 11 to the atmosphere at the joining / unifying portion.
The drain pump for an air conditioner according to claim 1, further comprising: