JP2010275972A - Drainage pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the waterproofness of a drainage pump and prevent corrosion of metal members caused by drippage. <P>SOLUTION: The drainage pump 1 includes a bump body 3 with moving vanes built inside, and a motor 5 situated above the pump body 3 and rotatively driving the moving vanes 2. The motor 5 is formed of a mold motor, an upper cover 6 for waterproof is provided on the motor 5 for covering the metal members on an upper face side of the same, and a lower cover 7 for waterproof is further provided between the motor 5 and the pump body 3 for covering the metal members on a lower face side of the motor 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drainage pump, and more particularly to a pump that is incorporated in an air conditioning indoor unit and is used to drain drain water generated in an evaporator during cooling or dehumidification to the outside of the room.

  Conventionally, as shown in FIG. 8, the separate type air conditioner includes an outdoor unit 32 including a compressor 34 and a condenser 35, and an indoor unit 33 including an expansion valve 36 and an evaporator 37. A gaseous refrigerant is compressed by a compressor 34, cooled by a condenser 35 to form a liquid, the pressure of the liquid is lowered by an expansion valve 36, and vaporized by an evaporator 37 to remove the heat of vaporization, thereby cooling the room. In addition, the arrow in a figure shows the direction through which a refrigerant | coolant flows.

  Here, in the indoor unit 33 of the air conditioner 31, moisture in the air condenses and adheres to the evaporator 37 during the cooling operation, and drops into a drain pan 38 provided below the evaporator 37. Therefore, a drain pump 39 is used to drain the drain water accumulated in the drain pan 38 to the outside. Using this drainage pump 39, drain water was once raised by a riser 40 and then led outside through an inclined pipe 41.

  However, in the above-described configuration, drain water stored in the riser pipe 40 and the like when the drain pump 39 is stopped flows backward toward the drain pump 39 and pierces the upper lid 42 of the drain pump 39 as shown in FIG. There is a case where it blows out from the provided through hole 43. Further, when the water level is high, drain water may overflow from the through hole 43 of the drain pump 39 during the pumping operation. In such a case, the discharged drain water W is scattered to the motor 44 side, causing the motor 44 to corrode and causing a malfunction.

  Therefore, as shown in FIG. 9B, for example, in the drainage pump described in Patent Document 1, a disk-shaped draining plate 46 is attached to the drive shaft 45 above the through hole 43, and the discharged drain water is Adhering to the motor 44 and the like is prevented.

JP 2000-240581 A

  In the indoor unit 33 shown in FIG. 8, water accumulated in the drain pan 38 may evaporate, and water droplets may adhere to the top plate of the indoor unit 33. In this case, water drops from above the drainage pump 39 and the motor 44 gets wet, which may cause corrosion of the motor 44 and the metal member in the motor 44, leading to malfunction.

  Then, this invention is made | formed in view of the problem in the said conventional drainage pump, Comprising: It provides a drainage pump which can improve waterproofness and can prevent the corrosion of the metal member by dripping water. Objective.

  In order to achieve the above object, the present invention is a drainage pump comprising a pump housing incorporating a rotating blade, and a motor positioned above the pump housing and rotationally driving the rotating blade. A waterproof cover that covers the metal member on the upper surface side of the molded motor is provided on the molded motor.

  And according to this invention, since the motor was comprised with the mold motor and the waterproof cover was provided so that the metal member of the upper surface side might be covered, a motor and a metal member are appropriately removed from the water dripped from the upper part of a drainage pump. It can be protected and it is possible to prevent their corrosion.

  In the drainage pump, the side surface of the waterproof cover can be provided with a recess into which the gate port formed on the side surface of the molded motor is fitted. According to this, the waterproof cover and the motor can be positioned with a simple configuration. Can do. In addition, the waterproof cover can be prevented from rotating on the motor, and vibration and noise during operation can be kept low.

  In the drainage pump, a second waterproof cover may be provided between the mold motor and the pump housing to cover the metal member on the lower surface side of the mold motor. According to this, the metal member located on the lower side of the motor can be protected, and appropriate waterproof measures can be taken over the entire drainage pump.

  In the drainage pump, a snap fit portion that protrudes toward the other of the waterproof cover and the second waterproof cover is integrally formed on one side surface of the waterproof cover and the second waterproof cover. And a locking portion for locking the locking claw on the other side surface of the waterproof cover and the second waterproof cover. According to this, attachment and detachment of a waterproof cover and a 2nd waterproof cover become easy, and it becomes possible to improve workability | operativity at the time of the assembly of a drain pump or repair. In addition, since the snap-fit portion is formed integrally with the waterproof cover or the second waterproof cover, a metal mounting member is unnecessary, and corrosion of the mounting member due to dripped water can be avoided.

  In the drainage pump, the side surface of the second waterproof cover can be provided with a recess into which the gate port formed on the side surface of the molded motor is fitted. According to this, the second waterproof cover and the motor can be configured with a simple configuration. Can be positioned.

  In the drainage pump, a through hole is formed in a bottom portion of the second waterproof cover, and the bottom portion of the second waterproof cover is disposed on an upper portion of a pump chamber of the pump housing, and the rotary blade located in the pump chamber The connecting shaft provided in can be inserted into the through hole. Since the bottom part of the second waterproof cover and the lid member of the pump housing are integrated, the number of parts can be reduced, and the number of assembling steps and the part cost can be reduced.

  In the drainage pump, the waterproof cover and / or the second waterproof cover may be a resin molded product.

  In the drainage pump, the mold motor may have a flat DC brushless motor structure. According to this, the motor can be reduced in size and weight, and vibration and noise during operation can be suppressed low.

  As described above, according to the present invention, it is possible to provide a drainage pump capable of improving waterproofness and preventing corrosion of a metal member due to dripping water.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which shows one Embodiment of the drainage pump concerning this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is an AA partial fragmentary sectional view of Drawing 1 (a). It is an exploded view of the drainage pump of FIG. It is a figure which shows the structure of the rotary blade of the drainage pump of FIG. 1, Comprising: (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows the structure of the motor of the drainage pump of FIG. 1, (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the structure of the upper cover of the drainage pump of FIG. 1, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the structure of the lower cover of the drainage pump of FIG. 1, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is the schematic which shows the whole structure of the conventional separate type air conditioner. It is a figure which shows an example of the conventional drainage pump.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  1 to 3 show an embodiment of a drainage pump according to the present invention. This drainage pump 1 is roughly divided into a pump main body (pump housing) 3 containing a rotary blade 2 and an upper part of the pump main body 3. , The upper cover 6 provided on the upper portion of the motor 5, and the lower cover 7 interposed between the pump body 3 and the motor 5.

  The pump body 3 is for sucking up drain water collected in a drain pan (not shown) and draining it outside the room. As shown in FIG. 2, the pump body 3b for accommodating the rotary blades 2 and the pump chamber 3b A plastic housing 3a in which a suction pipe 3c provided in the lower part and a discharge pipe 3d extending in the horizontal direction from the pump chamber 3b are formed. As shown in FIGS. 1B and 1C, a snap fit portion 3f having a locking claw 3e protruding at the tip is formed on the side peripheral surface of the housing 3a. The lid member that closes the upper opening of the housing 3a is constituted by the bottom of the lower cover 7, as shown in FIG.

  As shown in FIG. 4, the rotary blade 2 is formed of plastic, and on the surface of the dish-like member 2a, a dish-like member 2a, a columnar connecting shaft 2b extending along the central axis of the dish-like member 2a, and the dish-like member 2a. A plurality of large-diameter blades 2 c formed and a plurality of small-diameter blades 2 d formed on the back surface side of the dish-like member 2 a and inserted into the suction pipe 3 c of the pump body 3 are provided. A connecting hole 2e for press-fitting the drive shaft 5b of the motor 5 is formed in the connecting shaft 2b.

  The motor 5 is provided for rotationally driving the rotary blade 2 built in the pump body 3, and a rotor (rotor), a stator (stator), and the like are accommodated therein. In the motor 5, as shown in FIG. 5, the stator, the circuit board 5e, and the like are subjected to a molding (resin sealing) process with an insulating resin to form a motor outer shell 5a.

  In addition, the motor 5 is a so-called flat DC brushless motor, has a Hall element drive IC, and has a rotor (rotor) provided with a permanent magnet facing the stator (stator side) on the inside. It is composed of an installed inner rotor type. This type of motor has the characteristics that the overall height can be reduced, and the operating sound and vibration are small with uniform torque.

  A drive shaft 5b connected to the rotary blade 2 in the pump body 3 protrudes from the lower part of the motor outer shell 5a. On the upper and lower surfaces of the motor outer shell 5a, bearings 5c for supporting the drive shaft 5b, 5d is arranged. The drive shaft 5b and the bearing portions 5c and 5d are all made of metal and are arranged in an exposed state. As shown in FIG. 2, a disk-shaped draining plate 8 that prevents water blown from the pump body 3 from adhering to the motor 5 is attached to the drive shaft 5 b.

  The upper cover 6 is provided to prevent a metal member (bearing portion 5c) exposed on the upper surface side of the motor 5 from getting wet or water from entering inside through a gap between the bearing portion 5c and the motor outer shell 5a. . The upper cover 6 is formed of plastic, and as shown in FIG. 6, includes a covered cylindrical cover body 6 a in which a housing portion 6 b for housing the bearing portion 5 c of the motor 5 is provided at the center of the upper surface.

  The inner diameter of the cover body 6a is substantially the same as the outer diameter of the motor 5, and a snap fit portion 6d having a locking claw 6c projecting from the tip thereof on the side peripheral surface of the cover body 6a, and a motor 5 is formed with a recess 6e corresponding to the lead wire connecting portion 5g (see FIG. 5) and a recess 6f corresponding to the gate port 5h (see FIG. 5) on the side surface of the motor outer shell 5a.

  The lower cover 7 is provided to prevent water from adhering to the metal members (drive shaft 5b, bearing portion 5d) exposed on the lower surface side of the motor 5 from the outside, and is formed of plastic as with the upper cover 6. The As shown in FIG. 7, the lower cover 7 includes a cylindrical cover main body 7a, a motor support portion 7b formed in the upper portion of the cover main body 7a, and a bottom portion 7d having a through hole 7c formed in the center. . A plurality of support portions 7e are provided inside the cover body 7a to supplement the strength of the lower cover 7, and water accumulated in the cover is discharged on the side surface of the cover body 7a, Is provided with a slit 7f for preventing negative pressure from becoming negative pressure.

  The motor support portion 7b is formed to have a larger diameter than the cover body 7a, and a first locking portion 7g for locking a snap fit portion 6d (see FIG. 6) of the upper cover 6 is formed on a side peripheral surface thereof. A recess 7h corresponding to the gate opening 5h (see FIG. 5) on the side surface of the motor outer shell 5a is formed. The bottom portion 7d functions as a lid member that closes the upper opening of the housing 3a of the pump body 3 (see FIG. 2), and the side peripheral surface has a second portion that locks the snap fit portion 3f of the housing 3a. Two locking portions 7i are provided.

  Next, a method for assembling the drainage pump 1 having the above configuration will be described with reference to FIGS.

  First, as shown in FIGS. 2 and 3, the draining plate 8 is attached to the drive shaft 5 b of the motor 5 and the motor 5 is placed on the lower cover 7. At this time, the gate opening 5h of the motor 5 is fitted into the recess 7h provided in the motor support portion 7b of the lower cover 7 (see FIGS. 5 and 7), and the motor 5 and the lower cover 7 are positioned.

  As shown in FIG. 1A, the position of the recess 7h is such that when the assembly of the drainage pump 1 is completed, the lead wire connecting portion 5g (the lead wire 10a pulling direction) is the opening surface 3g of the discharge pipe 3d. Set the position so that it faces the same direction. Thereby, as shown to Fig.1 (a)-(c), the lead wire 10 can be arrange | positioned using the upper space of the discharge pipe 3d, and the drainage pump 1 in an indoor unit (not shown) can be arranged. Occupied space can be kept small.

  Next, as shown in FIGS. 2 and 3, the upper cover 6 is put on the upper part of the motor 5, and the gate port 5 h of the motor 5 is fitted into the recess 6 f of the upper cover 6 (see FIGS. 5 and 6). 6 and the motor 5 are positioned. In addition, by fitting the gate opening 5h into the recess 6f, it is possible to prevent the upper cover 6 from rotating on the motor 5 and to suppress vibration and noise during operation.

  Then, as shown in FIG. 1 (c), the locking claw 6 c of the snap fit portion 6 d hanging from the side peripheral surface of the upper cover 6 is locked to the first locking portion 7 g provided on the upper portion of the lower cover 7. To do. As a result, the upper cover 6 and the lower cover 7 are connected, and at the same time, the motor 5 is held between the covers 6 and 7 to prevent the motor 5 from rattling during operation.

  As described above, since the snap-fit connection is used to fix the covers 6 and 7, the covers 6 and 7 can be easily attached and detached, and the workability at the time of assembling or repairing the drainage pump 1 can be improved. Further, since the snap fit portion 6d is formed integrally with the plastic upper cover 6, a metal mounting member (for example, a screw) is not required, and corrosion of the mounting member due to dripped water can be avoided. .

  Next, as shown in FIGS. 2 and 3, the connecting shaft 2b of the rotary blade 2 is inserted into the through hole 7c of the lower cover 7, and the drive shaft 5b of the motor 5 is connected to the connecting hole 2e of the connecting shaft 2b (see FIG. 4). Press fit into. Thereafter, as shown in FIG. 1 (c), the locking claw 3e of the snap fit portion 3f rising from the side peripheral surface of the housing 3a is locked to the second locking portion 7i provided at the lower portion of the lower cover 7, The pump body 3 and the lower cover 7 are connected. An O-ring 11 as a sealing material is interposed between the pump body 3 and the lower cover 7 (see FIG. 2).

  As described above, according to the present embodiment, since the motor 5 is composed of a molded motor, the motor 5 can be made substantially waterproof, and the motor 5 can be made from water dripped from above the drainage pump 1. It becomes possible to protect. In addition, an upper cover 6 is provided on the motor 5 to protect the bearing portion 5c exposed on the upper surface side of the motor 5, so that the bearing portion 5c is corroded and water enters the motor through the gap. It becomes possible to prevent.

  In addition, since the lower cover 7 is disposed between the motor 5 and the pump body 3 so as to cover the bearing portion 5d and the drive shaft 5b exposed on the lower surface side of the motor 5, the metal located below the motor 5 is disposed. The members can be protected, and appropriate waterproofing measures can be taken throughout the drainage pump 1.

  In the above embodiment, a snap fit portion 6d that protrudes toward the lower cover 7 is provided on the side peripheral surface of the upper cover 6, and the corresponding first locking portion 7g is provided on the side peripheral surface of the lower cover 7. Although formed on the upper part (see FIG. 1C), the snap fit part projecting toward the upper cover 6 is provided on the upper side surface of the lower cover 7 by reversing the positional relationship between the snap fit part and the locking part. A locking portion may be formed on the side peripheral surface of the upper cover 6. This is the same between the lower cover 7 and the pump body 3.

DESCRIPTION OF SYMBOLS 1 Drain pump 2 Rotary blade 2a Dish-shaped member 2b Connection shaft 2c Large diameter blade 2d Small diameter blade 2e Connection hole 3 Pump body 3a Housing 3b Pump chamber 3c Suction pipe 3d Discharge pipe 3e Locking claw 3f Snap fitting part 3g Opening surface 5 Motor 5a Motor outer shell 5b Drive shaft 5c, 5d Bearing portion 5e Circuit board 5g Lead wire connecting portion 5h Gate port 6 Upper cover 6a Cover body 6b Bearing portion receiving portion 6c Locking claw 6d Snap fitting portion 6e Recessed portion 6f Recessed portion 7 Lower cover 7a Cover body 7b Motor support portion 7c Through hole 7d Bottom portion 7e Support portion 7f Slit 7g First locking portion 7h Recessed portion 7i Second locking portion 8 Drain plate 10 Lead wire 11 O-ring

Claims (8)

A drainage pump comprising a pump housing containing a rotating blade, and a motor positioned above the pump housing and rotationally driving the rotating blade,
A drainage pump characterized in that the motor is constituted by a mold motor, and a waterproof cover for covering the metal member on the upper surface side is provided on the mold motor.   2. The drainage pump according to claim 1, wherein a concave portion for fitting a gate port formed on a side surface of the molded motor is provided on a side surface of the waterproof cover.   3. The drainage pump according to claim 1, wherein a second waterproof cover is provided between the mold motor and the pump housing to cover a metal member on the lower surface side of the mold motor.   On one side of the waterproof cover and the second waterproof cover, a locking claw protrudes from the tip, and a snap fit portion that protrudes toward the other of the waterproof cover and the second waterproof cover is formed integrally. The drainage pump according to claim 3, wherein a locking portion for locking the locking claw is formed on the other side surface of the waterproof cover and the second waterproof cover.   5. The drainage pump according to claim 3, wherein a recess for fitting a gate port formed on a side surface of the molded motor is provided on a side surface of the second waterproof cover.   A through hole is formed in the bottom of the second waterproof cover, and the bottom of the second waterproof cover is disposed at the upper part of the pump chamber of the pump housing, and is connected to the rotary blade located in the pump chamber The drainage pump according to claim 3, 4 or 5, wherein a shaft is inserted into the through hole.   The drainage pump according to any one of claims 1 to 6, wherein the waterproof cover and / or the second waterproof cover is a resin molded product.   The drain pump according to any one of claims 1 to 7, wherein the mold motor has a flat DC brushless motor structure.

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