JP5227892B2 - Drainage pump - Google Patents

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. 9, a 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, the drain pipe was once raised by the riser 40, and then drain water was led to the outside through the inclined pipe 41.

  However, in the above configuration, the 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 is pierced into 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. 10B, 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

  However, since the drainage pump described in Patent Document 1 includes the draining plate 46, it can prevent the drain water from adhering to the motor 44 and the like, but the number of parts increases, leading to an increase in manufacturing cost. There was a problem.

  Therefore, the present invention has been made in view of the problems in the conventional drainage pump described above, and it is possible to prevent water blown out from the through hole from adhering to the motor while reducing the number of parts. The purpose is to provide a drainage pump.

  In order to achieve the above object, the present invention includes a pump housing having a through-hole that opens upward and incorporating a rotating blade, and a motor that is positioned above the pump housing and rotationally drives the rotating blade. In the drainage pump, the rotary blade includes a shaft-like connecting portion connected to the motor, and at least a part of the connecting portion protrudes from the pump housing and is accommodated in the pump housing. The flange is formed integrally with the projecting portion.

  According to the present invention, since the flange provided on the rotary blade plays a role of draining water, it is possible to prevent the water blown out from the through hole from adhering to the motor without separately mounting a draining plate. Become.

  The said drainage pump WHEREIN: The said flange can be formed in the upper end part of the said connection part.

  In the drainage pump, the outer diameter of the flange can be made smaller than the minimum inner diameter of the through hole. According to this, it becomes possible to improve workability at the time of assembling the pump housing while avoiding the complexity of the structure of the pump housing.

  In the drainage pump, the pump housing includes a rising portion that is erected along the periphery of the through hole, and a chamfered portion is formed at an upper end portion of an inner peripheral surface of the rising portion. it can. According to this, it can guide so that the water which blows off from a through hole may be scattered to a horizontal direction, and it becomes possible to prevent suitably that the water which blows off adheres to a motor etc. exceeding a flange. Note that the chamfered portion is not limited to a flat shape, and may be formed in a curved shape.

  In the drainage pump, a guide portion may be provided at a lower portion of the flange for guiding the water obliquely downward by changing a scattering direction of the water blown out from the through hole. According to this, it is possible to reduce the risk that the water blown out from the through hole exceeds the flange, and it is possible to more suitably prevent water from adhering to the motor or the like.

  As described above, according to the present invention, it is possible to provide a drainage pump capable of preventing the water blown out from the through hole from adhering to the motor while reducing the number of components.

1 is an overall view showing a first embodiment of a drainage pump according to the present invention. It is a perspective view which shows the structure of the rotary blade | wing of FIG. It is an enlarged view which shows the connection part of a motor and a pump main body. It is a figure which shows the assembly | attachment procedure of a pump main body. It is an enlarged view which shows the other shape of a chamfer. It is an enlarged view which shows 2nd Embodiment of the drainage pump concerning this invention. It is an enlarged view which shows the other formation position of a flange. It is an enlarged view which shows the other shape of a standing part. 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.

  FIG. 1 is an overall view showing a first 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 a pump main body 3. And a motor 5 that rotationally drives the rotary blade 2 through the drive shaft 4.

  The pump body 3 is for sucking up drain water collected in a drain pan (not shown) and draining it outside the room, and includes a housing 6 and a lid member 7 for closing an opening in the upper part of the housing. The housing 6 is formed with a pump chamber 6a for accommodating the rotary blade 2, a suction pipe 6b provided at the lower part of the pump chamber 6a, and a discharge pipe 6c extending in the horizontal direction from the pump chamber 6a. On the other hand, the lid member 7 is formed with a through hole 7a drilled in the central part and a rising part 7b standing up around the through hole 7a. An O-ring 8 serving as a sealing material is interposed between the housing 6 and the lid member 7.

  The rotary blade 2 is formed of plastic, and as shown in FIG. 2, the dish-shaped member 2a, the columnar connecting shaft 2b extending along the central axis of the dish-shaped member 2a, and the dish-shaped member 2a. A plurality of large-diameter blades 2c formed on the surface, and a plurality of small-diameter blades 2d formed on the back surface side of the dish-like member 2a and inserted into the suction pipe 6b of the pump body 3. As shown in FIG. 3A, the rotary blade 2 includes the housing 6 in a state where the connecting shaft 2 b is inserted into the through hole 7 a of the lid member 7 and the upper portion of the connecting shaft 2 b protrudes from the lid member 7. Is accommodated in the pump chamber 6a.

  Returning to FIG. 2, a connecting hole 2e extending from the upper end surface of the connecting shaft 2b toward the dish-like member 2a is formed at the center of the connecting shaft 2b. A drive shaft 4 connected to the motor 5 is press-fitted into the connection hole 2 e, whereby the rotational force of the motor 5 is transmitted to the rotary blade 2.

  Moreover, the flange 2f extended in the horizontal direction from the outer peripheral surface of the connection shaft 2b is formed in the upper end part of the connection shaft 2b. The flange 2f is formed integrally with the connecting shaft 2b, and serves as a drainer for preventing water blown from the through hole 7a of the lid member 7 from adhering to the motor 5 as shown in FIG.

  The outer diameter φa of the flange 2f is formed smaller than the minimum inner diameter φb of the through hole 7a of the lid member 7 as shown in FIG. This is in consideration of convenience in assembling the pump body 3 and simplification of the structure of the lid member 7, and is specifically as follows.

  As shown in FIG. 4, the assembly of the pump body 3 needs to be press-fitted into the rotary blade 2 of the drive shaft 4 protruding from the through hole 7 a of the lid member 7, and in the process, the rotary blade It is necessary to pass the two connecting shafts 2b through the through holes 7a of the lid member 7. At this time, if the outer diameter φa of the flange 2f is smaller than the minimum inner diameter φb of the through hole 7a, the connecting shaft 2b can be easily passed without significant improvement to the lid member 7, and the lid member 7 It is possible to ensure good workability while maintaining the basic structure.

  However, in the above case, good workability can be secured, but the outer diameter φa of the flange 2f is limited to a certain size or less. Therefore, as shown in FIG. 3A, in the lid member 7, a chamfered portion 7c is provided at the upper end portion of the inner peripheral surface of the rising portion 7b, and the water W blown from the through hole 7a is laterally transmitted by the chamfered portion 7c. (See FIG. 3B). Thereby, it is avoided as much as possible that the water W blows upward, and it is suitably prevented from adhering to the motor 5 beyond the flange 2f.

  The chamfered portion 7c is formed in an annular shape when viewed from above over the entire inner periphery of the rising portion 7b. In this case, the chamfered portion 7c is not limited to the curved shape as shown in FIG. It can also be formed into a shape.

  As described above, according to the present embodiment, since the flange 2f is provided at the upper end portion of the rotary blade 2, a through-hole can be formed without mounting a conventionally used draining plate 46 (see FIG. 10B). It can prevent that the water W which blows off from 7a adheres to the motor 5 grade | etc.,. For this reason, it becomes possible to cope with a reverse flow of drain water or the like when the drain pump is stopped while reducing the number of parts.

  FIG. 6 is an enlarged view showing a second embodiment of the drainage pump according to the present invention. In this figure, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted.

  In the drainage pump 10 shown in FIG. 6, a guide portion 2g for guiding the water W obliquely downward by changing the scattering direction of the water W blown from the through hole 7a is provided below the flange 2f. The guide portion 2g is formed so that the flange 2f is thick at the outer peripheral portion of the flange 2f, and is formed in an annular shape in a bottom view over the entire outer periphery of the flange 2f. The guide portion 2g is not limited to a curved surface shape as shown in FIG. 6A, but may be formed in a flat shape as shown in FIG.

  Thus, by providing the guide part 2g at the lower part of the flange 2f, the risk that the water W blown from the through hole 7a exceeds the flange 2f can be reduced, and the water W can be more adhered to the motor 5. It becomes possible to prevent suitably.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, in the above embodiment, the flange 2f is provided at the upper end of the connecting shaft 2b. However, it is sufficient that the flange 2f is formed at any position of the protruding portion of the connecting shaft 2b. As shown in FIG. It can also be provided below the upper end of the shaft 2b.

  In the above embodiment, the rising portion 7b of the lid member 7 is formed so as to be narrowed to the inner side (through hole 7a side) (see FIG. 3A). However, as shown in FIG. Can also be formed upright.

DESCRIPTION OF SYMBOLS 1, 10 Drain pump 2 Rotary blade 2a Dish-shaped member 2b Connection shaft 2c Large diameter blade 2d Small diameter blade 2e Connection hole 2f Flange 2g Guide part 3 Pump body 4 Drive shaft 5 Motor 6 Housing 6a Pump chamber 6b Suction tube 6c Discharge tube 7 Lid member 7a Through hole 7b Rising part 7c Chamfered part 8 O-ring

Claims (6)

A drainage pump comprising a pump housing having a through-hole that opens upward and having a built-in rotary blade, and a motor that is positioned above the pump housing and rotationally drives the rotary blade;
The rotary blade includes a shaft-like connecting portion connected to the motor, and is accommodated in the pump housing in a state where at least a part of the connecting portion protrudes from the pump housing, and a flange is formed on the protruding portion. A drainage pump characterized by being integrally formed.   The drainage pump according to claim 1, wherein the flange is formed at an upper end portion of the connecting portion.   The drainage pump according to claim 1 or 2, wherein an outer diameter of the flange is smaller than a minimum inner diameter of the through hole.   The pump housing includes a rising portion that is erected along the periphery of the through hole, and a chamfered portion is formed at an upper end portion of an inner peripheral surface of the rising portion. 3. The drainage pump according to 3.   The drainage pump according to claim 4, wherein the chamfered portion is formed in a curved shape.   The drainage according to any one of claims 1 to 5, wherein a guide portion is provided at a lower portion of the flange to guide the water obliquely downward by changing the direction of scattering of the water blown out from the through hole. pump.

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