KR101577482B1 - Drain pump - Google Patents

Abstract

assignment
Provided is a drain pump capable of avoiding attachment of a drain over a motor shaft through a through hole formed in a pump chamber housing for partitioning the pump chamber by only the decoupling member.
Solution
The drain pump 1 has a wing car body 341 disposed in the pump chamber 33 and a wing body 341 extending upward from the wing car body 341 and connected to the bottom plate 361 of the upper pump chamber housing 36 of the pump chamber 33 A shaft portion 342 passing through the formed through hole 331 and a recessed portion 345 formed in the shaft portion 342 and into which the motor shaft 22 is inserted. The tearing member 37 is mounted on the shaft end portion 342a exposed upward from the bottom plate 361 of the upper pump chamber housing 36 in the shaft portion 342. The outer circumferential surface 342e of the shaft end portion 342a, And a ring-shaped collar portion 372 extending in the radial direction perpendicular to the motor shaft 22 from the cylinder portion 371. The cylindrical portion 371 is in contact with the cylindrical portion 371. The tilting member 37 is mounted on the bladed wheel 34 and the motor shaft 22 is not exposed therebetween.

Description

Drain pump {DRAIN PUMP}

The present invention relates to a drain pump for discharging a drain (drain) draining from a drain pan. More particularly, the present invention relates to a drain pump including a water cut-off member for preventing a drain overflowing from a through hole formed in a pump chamber housing for partitioning a pump chamber from being attached to a drive motor.

In the indoor unit of the air conditioner, the drain generated in the indoor unit by the evaporator during cooling or dehumidification is received by the drain pan, and the drain which is high in the drain pan is sucked up by the drain pump and discharged to the outside. The drain pump has a pump section having a pump chamber and a vane wheel arranged in the pump chamber, and a motor section having a motor shaft coaxially connected to the vane wheel. The pump section is used in a state where the pump section is positioned below the motor section.

The drain pump stirs the drain in the pump chamber by rotating the wing car in the pump chamber, sucking the drain of the drain pan into the pump chamber from the suction port formed at the lower end of the pump chamber by the centrifugal force generated thereby, As shown in Fig. A drain pipe is connected to the discharge port, and the drain is discharged from the discharge port to the outside through the drain pipe. A pump chamber housing the pump chamber of the drain pump is formed with a through hole for introducing air into the pump chamber when the drain is stirred by the blades. The wing car is connected to the motor shaft via this through hole and is driven by a motor.

When the rotation of the wing car is stopped by stopping the motor in the drain pump, the drain may flow back toward the pump chamber from the drain observation side. Here, if the drain flows backward, there is a possibility that the drain overflows through the through-hole from the pump chamber and is attached to the motor disposed above the pump chamber. When the motor is wet, there is a risk of electric leakage or malfunction of the motor. Therefore, the motor shaft is provided with a watertight plate so as to face the through hole, so that the drain blown from the through hole is not scattered to the motor side have. Such a drain pump is described in Patent Document 1.

The seal member is mounted on the outer circumferential side of the motor shaft exposed between the blades and the water cut-off plate in consideration of the possibility of occurrence of electric leakage even when the drain is attached to the motor shaft.

Japanese Laid-Open Patent Publication No. 2009-36167

In Patent Document 1, in order to prevent the drain from being attached to the motor, a seal member is required in addition to the watertight plate, resulting in an increase in the number of parts. In addition, in Patent Document 1, since the seal member is disposed between the blade wheel to which the motor shaft is connected and the water discharge plate mounted to the motor shaft, if the motor shaft and the blade wheel are not mounted with good accuracy in the axial direction There is a problem that the dimension between the blade car and the water cut-off plate changes and the sealing property by the seal member is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a drain pump capable of surely avoiding the attachment of the drain to the motor shaft through the through hole formed in the pump chamber housing partitioning the pump chamber .

In order to solve the above problems,

A pump unit having a pump chamber and an impeller, and a motor unit having a motor shaft connected to the impeller in a coaxial state, wherein the pump unit is located below the motor unit (drain fan side) ,

The vane car has a wing car body disposed in the pump chamber and a coaxial extension extending from the wing car body through a through hole formed in a pump chamber housing for partitioning the pump chamber, And a shaft portion projecting to the outside of the pump chamber,

The shaft portion is provided with a motor shaft pressing recessed portion extending downward on a coaxial axis from an upper end surface (end surface on the side of the motor) of the shaft portion,

And the shaft end portion is equipped with a water cutting member having a shape widening outwardly from the outer peripheral surface of the shaft end portion.

According to the present invention, the tractive members are not mounted on the motor shaft, but mounted on the shaft ends of the blades. As a result, since the motor shaft is not exposed between the decoupling member and the impeller, it is possible to prevent the leakage caused by the attachment of the drain to the motor shaft and the rust of the motor shaft. In addition, in order to prevent the drain from adhering to the motor shaft, it is not necessary to form a seal member covering the outer circumferential side of the motor shaft, so that the number of parts can be reduced.

In the present invention, it is preferable that the tearing member is fixed to the shaft end portion. In this case, for example, if the tear-off member is fixed to the shaft end portion by press-fitting, it can be fixed with sufficient strength, so that the assembling work is facilitated.

In this case, it is preferable that the tear-off member is press-fitted and fixed to the shaft end portion, and the shrink-wound member is provided with a shaft-portion press-fitting barrel into which the shaft end portion is press- In this case, since the press-in stand for the axial end portion can be secured for a long time, looseness or positional displacement due to the rotational force or vibration of the pump, external impact, The fixing to the shaft end becomes stable and strong.

In this case, it is preferable that the pick-up member has a collar portion that widens outward from the outer peripheral surface of the shaft portion press-fitting cylinder portion, and the outer peripheral edge of the collar portion is located radially outward of the through-hole. In this case, the effect of preventing the drain overflowing from the through hole upwardly from scattering upward is more effective.

In this case, it is preferable that the pump chamber housing further comprises: an annular bottom plate having the through-hole; an inner circumferential wall extending upward from the outer circumferential edge of the bottom plate; And an outer circumferential wall extending upward from an outer circumferential edge of the circular ring plate portion. The lower end portion of the outer circumferential wall is provided with a long hole extending in the circumferential direction And the collar portion is formed above the lower end of the elongated hole. In this way, since the water surface of the drain is discharged from the slot before reaching the collar portion, the drain does not cross the collar portion and reach the motor shaft. Therefore, rusting of the motor shaft can be prevented.

In this case, the pick-up member is in contact with the positioning portion of the shaft portion when the shaft end portion is press-fitted into the shaft portion press-fitting cylinder portion, And a stopper for determining the position of the stopper. In this manner, the tear-off member can be mounted in a state of being positioned at the shaft end of the bladedine. Further, by bringing the stopper into contact with the positioning portion of the shaft portion, the posture of the pick-up member mounted on the shaft end portion can be set to a predetermined posture determined in advance.

In this case, it is preferable that the positioning portion of the shaft portion is the upper end surface of the shaft portion. In this case, the shaft portion can be shortened.

In this case, the stopper includes a shaft hole into which the motor shaft is inserted, and a gap is formed between the motor shaft and the stopper so that capillary force does not act desirable. By doing so, it is possible to prevent the drain from being held between the motor shaft and the relief member due to the capillary phenomenon even when the drain overflowing from the through hole is attached to the relief member.

In the present invention, it is preferable that the gap is formed above the lower end of the elongated hole. In this case, since the water surface of the drain is discharged from the slot before reaching the gap, the rust of the motor shaft can be prevented.

In the present invention, it is preferable that the motor shaft press-fit concave portion has a large-diameter portion that is larger in diameter than the motor shaft from the front end surface side of the shaft portion, and a small- It is preferable that the above- By doing so, the motor shaft can be press-fitted into the motor shaft press-fit concave portion even if the front end portion of the motor shaft press-fit concave portion is compressed inward by press-fitting the shaving member into the axial end portion. Therefore, connection work of the blades, the tearing members, and the motor shaft is facilitated.

In the present invention, it is preferable that a positioning portion is formed on the outer peripheral side of the shaft end portion, and the tear-off member is fixed to the positioning portion. In this way, the positions of the water disc and the blades can be accurately assembled.

In this case, it is preferable that the shaft end portion extends upward from the shoaling member. In this case, the drain does not reach the motor shaft.

In the present invention, it is preferable that the positioning portion is a ring-shaped stepped portion, and the tear-off member is a ring-shaped plate having a constant thickness, and the inner circumferential portion of the ring-shaped plate is fixed to the circular- Do. In this case, since the pick-up member is in the form of a plate, the manufacturing cost can be suppressed.

In the present invention, the positioning portion is an annular groove extending in the circumferential direction of the shaft end portion, and the tear-off member is a circular ring plate having a constant thickness, and the inner peripheral portion of the annular- It is preferable to fix it by being fitted. In this case, since the pick-up member is in the form of a plate, the manufacturing cost can be suppressed. It is also possible to prevent displacement of the pick-up member mounted on the axial end portion due to rotational force or vibration of the pump, external shock, or aged change.

According to the present invention, the tractive members are not mounted on the motor shaft, but mounted on the shaft ends of the blades. As a result, since the motor shaft is not exposed between the decoupling member and the impeller, it is possible to prevent the leakage caused by the attachment of the drain to the motor shaft and the rust of the motor shaft. In addition, in order to prevent the drain from adhering to the motor shaft, it is not necessary to form a seal member covering the outer circumferential side of the motor shaft, so that the number of parts can be reduced.

1 is an outline perspective view of a drain pump to which the present invention is applied.
2 is a longitudinal sectional view of a drain pump to which the present invention is applied.
3 is a cross-sectional view of the pump portion and a partial enlarged view of the periphery of the shaft portion of the wing car.
4 is a perspective view, a plan view, and a cross-sectional view of a wing car.
5 is a perspective view and a cross-sectional view of the tearing member.
6 is an explanatory view for explaining the operation of the drain pump.
7 is a partially enlarged view of the periphery of the shaft portion of the pump portion of the drain pump of the modified example.
8 is a longitudinal sectional view of the pump section of the drain pump of the second embodiment.
9 is a partially enlarged view of the periphery of the shaft portion of the pump unit of the drain pump of the modified example of the second embodiment.

Hereinafter, a drain pump to which the present invention is applied will be described with reference to the drawings.

(Example 1)

(Total configuration)

1 is an outline perspective view of a drain pump. 2 is a longitudinal sectional view of the drain pump. As shown in Fig. 1, the drain pump 1 is disposed in an indoor unit of the air conditioner, above the drain pan 100 that receives the drain (D) generated in the indoor unit by the evaporator during cooling or dehumidification .

The drain pump (1) has a motor unit (2) and a pump unit (3) as a drive source. 1, the pump section 3 is located below the motor section 2, that is, on the side of the drain pan 100, in the state where the drain pump 1 is used. Three mounting arms 21 for fixing the drain pump 1 to the indoor unit are projected upward from the upper portion of the motor unit 2. [ The motor shaft 22 is projected downward from the lower end face of the motor unit 2. [

The pump unit 3 includes a suction pipe 30 extending downward and a discharge pipe 31 extending laterally. The lower end opening 30a of the suction pipe 30 is located inside the drain pan 100 and the drain pipe 101 is connected to the discharge pipe 31. [

2, a pump chamber 33 is partitioned by a pump chamber housing 32 inside the pump portion 3, and a vane wheel 34 is disposed in the pump chamber 33. As shown in Fig. The pump chamber housing 32 includes a lower pump chamber housing 35 and an upper pump chamber housing 36. The vane wheel 34 has a through hole 331 formed in the bottom plate 361 of the upper pump chamber housing 36 And is connected to the motor shaft 22 interposed therebetween. The wing wheel 34 is provided with a recovery member 37 for preventing the drain D overflowing upward from the pump chamber 33 through the through hole 331.

The drain D accumulated in the drain pan 100 is sucked into the pump chamber 33 from the lower end opening 30a of the suction pipe 30 when the vane wheel 34 is rotated by driving the motor unit 2, (31). The drain (D) discharged from the discharge pipe (31) is discharged to the outside through the drain pipe (101).

(Motor section)

As shown in Fig. 2, the motor unit 2 includes a lower motor case 23 made of resin and an upper motor case 24. The lower motor case 23 includes an annular bottom plate 231, a cylindrical portion 232 extending upward from the inner peripheral edge portion of the bottom plate 231, And a flange 234 having an annular shape extending radially outward from the lower end of the circumferential wall 233. The flange 234 has an annular flange 234 extending radially outward from the lower end of the circumferential wall 233. On the bottom plate 231, an annular circuit board 25 is placed with a slight gap. The cylindrical portion 232 is provided with a circular ring shaped step portion 232a on the outer peripheral surface portion in the axial direction L and a stator 26 is fixed to the circular ring shaped step portion 232a. The stator 26 includes a stator core having a plurality of salient poles protruding in the radial direction, and a drive coil wound around each salient pole.

On the inner circumferential side of the cylindrical portion 232, two annular sintered (oil-containing) bearings 27 are mounted at positions away from the axial direction L. The sintered bearing 27 is supported in such a state that the motor shaft 22 is freely rotatable. The lower portion of the motor shaft 22 protrudes downward from the lower motor case 23 and the upper end portion of the motor shaft 22 protrudes upward from the barrel portion 232. A cup-shaped yoke 28 is mounted on the upper end of the motor shaft 22 with its opening facing downward. On the inner peripheral surface of the yoke 28 facing inward, an S pole and an N pole are alternately arranged in the circumferential direction Shaped permanent magnet 29 that is magnetized by a magnetic field is mounted.

The upper motor section case 24 includes a circular ceiling plate 241, an outer peripheral wall 242 extending downward from the outer peripheral edge portion of the ceiling plate 241, and an outer peripheral wall 242 extending radially outward from the outer peripheral wall 242 And a flange 243 having a circular ring shape. The upper motor part case 24 is covered from the upper side of the lower motor part case 23 and the inner peripheral part of the outer peripheral wall 242 is in contact with the outer peripheral surface of the peripheral wall 233 of the lower motor part case 23, And is fixed to the lower motor case 23 in a state in which the lower end surfaces of the outer peripheral wall 242 and the flange 243 are in contact with the upper end surfaces of the flanges 234 of the lower motor case 23. From the ceiling plate 241, three mounting arms 21 project upward.

(Pump section)

Fig. 3 (a) is a sectional view of the pump unit 3, and Fig. 3 (b) is a partial enlarged view of the periphery of the shaft portion of the vane wheel 34. Fig. The pump chamber housing 32 partitioning the pump chamber 33 in the pump section 3 is provided with a lower pump chamber housing 35 and an upper pump chamber housing 36. The lower pump chamber housing 35 includes a large diameter portion 353 having an annular bottom plate 351 and an outer peripheral wall 352 extending upward from the outer peripheral edge of the bottom plate 351, A discharge pipe 31 extending laterally from an opening edge of a circular opening 352a formed in a wall surface portion of the outer peripheral wall 352 and a discharge pipe 314 extending downward from the inner peripheral edge of the outer peripheral wall 352 And a flange 354 extending radially from the upper edge of the flange 354 and projecting upwardly.

The upper pump chamber housing 36 includes an annular bottom plate 361 having a through hole 331 at a central portion thereof, an inner circumferential wall 362 extending upward from the outer circumferential edge of the bottom plate 361, An annular plate portion 363 extending radially outward from the upper edge of the inner circumferential wall 362 and an outer circumferential wall 364 extending upward from the outer circumferential edge of the annular plate portion 363 . At the lower end portion of the outer circumferential wall 364, there are formed a plurality of elongated holes 365 extending circumferentially at equal angular intervals (see FIG. 1).

The lower portion of the inner circumferential wall 362 of the upper pump chamber housing 36 is inserted into the flange 354 of the lower pump chamber housing 35 via the O-ring 38, whereby the pump chamber 33 . That is, the bottom plate 361 of the upper pump chamber housing 36 defines the ceiling of the pump chamber 33, and the space inside the lower pump chamber housing 35 is the pump chamber 33. The pump chamber 33 has a large diameter pump chamber portion 333 located inside the large diameter portion 353 of the lower pump chamber housing 35 and a small diameter pump chamber portion 334 located inside the suction pipe 30 .

A small diameter concave portion 366 is formed above the pump chamber 33 from the pump chamber 33 by the upper surface of the bottom plate 361 of the upper pump chamber housing 36 and the inner circumferential wall 362, And a large-diameter concave portion 367 is defined by the circular-arc-shaped plate portion 363 and the outer circumferential wall 364. As shown in Fig.

(Wing car)

The vane wheel 34 will be described with reference to Figs. 3 and 4. Fig. 4 (a) is a perspective view of the vane wheel 34 viewed from above, Fig. 4 (b) is a perspective view of the vane wheel 34 viewed from below, And Fig. 4 (d) is a longitudinal sectional view of the vane wheel 34. As shown in Fig. 3, the wing car 34 is an integrally molded product made of resin. The wing car 34 is a wing car body 341 disposed in the pump chamber 33, and a wing wheel body 342 extending upwardly on the coaxial axis from the wing car body 341 And has a shaft portion 342 through which the axial end portion 342a passes through the through hole 331 of the upper pump chamber housing 36. [ The wing car body 341 includes a large diameter wing car 343 disposed in the large diameter pump chamber portion 333 and a large diameter wing wheel 343 extending downward coaxially from the large diameter wing car 343 and disposed in the small diameter pump chamber portion 334 And a small-diameter bladed wheel 344 which is provided on the outer periphery of the small-

As shown in Fig. 4, the large-diameter bladed wheel 343 has eight blades 343a extending outward from the center and a circular ring shape having a predetermined height arranged to surround the outer periphery of the blades 343a And a plate 343b. Each blade 343a extends along the axial direction L and is inclined in a direction opposite to the rotation direction (arrow) toward the outside in the radial direction (see Fig. 4 (c)). The four blade plates 343a arranged at intervals of one of the eight blade plates 343a are provided with cutouts 343c which are recessed upward toward the inner side at the lower end of the inner peripheral side. Diameter wing car 344 has four wing plates 344a extending radially outward from the center.

The shaft portion 342 extends upward from the center of the large-diameter bladed wheel 343. The shaft portion 342 is formed with a concave portion 345 (motor shaft press-fit concave portion) along the axial direction L (central axis line) from the upper end surface 342b of the shaft portion 342. [ The concave portion 345 is formed until reaching the upper end portion of the vane body 341, as shown in Fig. 4 (d).

Here, the upper end surface 342b of the shaft portion 342 is a positioning portion for determining the position of the pick-up member 37 when the pick-up member 37 is mounted. The concave portion 345 of the shaft portion 342 is inserted into the motor shaft 22 from the side of the upper end surface 342b of the shaft portion 342 as shown in Fig. Diameter portion 345a which is larger in diameter than the large-diameter portion 345a and a small-diameter portion 345b which is smaller in diameter than the large-diameter portion 345a and into which the inserted motor shaft 22 is inserted. 3 (b), the large-diameter portion 345a is located on the inner side of the tearing member 37 in the state where the tearing member 37 is mounted on the shaft portion 342. As shown in Fig. In this example, the depth dimension of the large-diameter portion 345a coincides with the length dimension of the shaft member 342 in the axial direction L of the fitting region of the shaving member 37. [

(Tearing member)

3 and 5, the decoupling member will be described. 5 (a) is a perspective view of the tearing member 37 seen from above, FIG. 5 (b) is a perspective view of the tearing member 37 as viewed from below, and FIG. 5 . The tearing member 37 is made of resin and has a coefficient of linear expansion close to that of the shaft portion 342 of the vane wheel 34 or the same material as the vane wheel 34 is used. The male thread member 37 includes a cylindrical portion 371 and a collar portion 372 having an annular shape protruding radially outward from the upper end edge of the cylindrical portion 371. The upper end of the cylindrical portion 371 And a circular-ring-shaped stopper 373 which projects radially inward from the edge. The inner peripheral edge portion of the lower end of the cylindrical portion 371 is cut to form a tapered surface 371a having a circular ring shape.

3 (a), the water gathering member 37 is formed on the inner side of the cylindrical portion 371 above the bottom plate 361 of the upper pump chamber housing 36 from the shaft portion 342 of the vane wheel 34 And is fixed to the shaft portion 342 in a state where the exposed shaft end portion 342a is press-fitted. The lower end face 373a of the annular stopper 373 is positioned at the position of the shaft portion 342 as shown in Figure 3 (b) And the collar portion 372 becomes a posture in which the collar portion 372 is widened in the direction orthogonal to the axial direction L. As a result, The lower end surface 371b of the cylindrical portion 371 faces the through hole 331 and the outer peripheral edge 372a of the collar portion 372 is in contact with the bottom of the upper pump chamber housing 36 of the pump chamber 33 Is located radially outward of the through hole (331) of the plate (361). After the pick-up member 37 is mounted on the shaft portion 342, the motor shaft 22 is inserted into the through hole 373b (shaft hole) at the center of the circular-ring-shaped stopper 373, The motor shaft 22 is inserted into the concave portion 345 of the motor shaft 22 so that the blades 34 and the motor shaft 22 are connected. A gap A (A) is provided between the inner peripheral surface 373c of the annular stopper 373 and the outer peripheral surface of the motor shaft 22 to prevent the capillary force from acting on the worm wheel 34 and the motor shaft 22, (See Fig. 3 (b)).

(Assembly method of drain pump)

Here, a method for assembling the drain pump 1 will be described. The shaft portion 342 of the bladed wheel 34 is first passed through the through hole 331 of the bottom plate 361 of the upper pump chamber housing 36. Then,

Next, in the shaft portion 342, the pick-up member 37 is mounted on the shaft end portion 342a which is exposed above the bottom plate 361 of the upper pump chamber housing 36. Then, That is to say, the shaft end portion 342a of the vane wheel 34 is press-fitted into the inside of the cylindrical portion 371 of the scooping member 37 so that the upper end surface 342b of the shaft portion 342 and the annular stopper 373 Is brought into contact with the lower end surface 373a. This allows the tearing member 37 to be rotated in the predetermined position in which the collar portion 372 is widened in the direction orthogonal to the axial direction L in a state where the collar portion 372 is positioned at the upper end of the shaft portion 342, Respectively. Further, the pick-up member 37 is firmly fixed to the vane wheel 34 by press-fitting. Here, in this example, since the positioning portion is the upper end surface 342b of the shaft portion 342 and the tear-off member 37 is fixed to the upper end portion of the exposed portion of the shaft portion 342, It is possible to inhibit the drain D from overflowing upward from the pick-up member 331 from colliding against the pick-up member 37 forcibly. Therefore, scattering of the drain D can be suppressed. In other words, since the clearance between the collar portion 372 and the through hole 331 becomes large, the drain D overflowing from the through hole 331 tends to be weak until it reaches the collar portion 372 It becomes.

A sealant or an adhesive may be applied to the vicinity of the interface of the press-in portion, for example, the tapered surface 371a and the gap A, in order to improve the sealability of the clearance between the shake collecting member 37 and the shaft end portion 342a. The shake collecting member 37 and the shaft end 342a may be welded together.

Thereafter, the motor shaft 22 of the motor unit 2 is press-fitted into the concave portion 345 formed in the shaft portion 342 and fixed.

Even if the shaft end portion 342a of the concave portion 345 is compressed toward the inside by press-fitting the tear-off member 37 into the shaft end portion 342a of the shaft portion 342, It is easy to insert the motor shaft 22 into the concave portion 345 and the motor shaft 22 can be easily inserted into the concave portion 345 because the axial end portion 342a is a large diameter portion 345a having a larger diameter than the motor shaft 22. Therefore, Diameter portion 345b of the concave portion 345. In addition,

The lower pump chamber housing 35 is attached to the upper pump chamber housing 36 from below and the pump chamber 33 partitioned by the lower pump chamber housing 35 and the upper pump chamber housing 36, And the wing car body 341 is housed.

(Operation of drain pump)

6 is an explanatory view for explaining the operation of the drain pump. Arrows in the drawing indicate the flow of the drain (D).

When the drain D of the drain pan 100 rises to a position higher than the lower end opening 30a of the suction pipe 30 disposed inside the drain pan 100 and the motor portion 2 of the drain pump 1 . When the vane wheel 34 rotates, the air is introduced into the pump chamber 33 through the through hole 331, the drain D is stirred in the pump chamber 33, and the centrifugal force generated by this causes the drain D are sucked into the pump chamber 33. That is, the drain D is sucked up from the drain pan 100 to the large-diameter pump chamber portion 333 through the small-diameter pump chamber portion 334 (D1). Then, the air is discharged from the discharge pipe 31 through the circular opening 352a of the large-diameter pump chamber portion 333 (D2). The drain (D) discharged from the discharge pipe (31) is discharged to the outside through the drain pipe (101).

Here, when the motor section 2 is stopped and the vane wheel 34 stops rotating, the drain D flows backward from the drain pipe 101 side (D3). At this time, most of the drain D that has flowed back flows back to the drain pan 100 via the suction pipe 30 (D4), but a part of the drain D overflows the pump chamber 33 through the through hole 331 May come. For example, when the drain pipe 101 connected to the discharge pipe 31 is long and the discharge port of the drain pipe 101 is disposed above the drain pump 1, or when a part of the drain pipe 101 The drain D in the drain pipe 101 vigorously flows back toward the pump chamber 33. In this case, the drain D of the drain D And a part thereof overflows from the through hole 331 (D5).

In this case, the drain D overflowing from the through hole 331 is returned to the downward direction by colliding against the tearing member 37, and the small diameter concave portion 366, which is partitioned above the pump chamber 33, . The drain which has been drawn into the small diameter concave portion 366 is returned from the through hole 331 to the drain pan 100 via the pump chamber 33 again. The drain D that is about to overflow from the small diameter concave portion 366 is discharged from the long hole 365 toward the drain pan 100 below (D6). Therefore, it is possible to prevent the drain (D) overflowing from the through hole (331) from adhering to the motor portion (2). Therefore, it is possible to avoid a short circuit caused by the wetting of the motor unit 2 and a faulty operation of the motor unit 2. [ Since the collar portion 372 and the clearance A are formed above the lower end of the elongated hole 365 and the small diameter concave portion 366, Is discharged from the elongated hole 365 toward the drain pan 100 downward before reaching the collar portion 372 and the gap A. [ Therefore, the drain D does not touch the motor shaft 22, and the rust of the motor shaft 22 can be prevented.

(Action effect)

According to this example, the tearing member 37 is not mounted on the motor shaft 22 but mounted on the shaft portion 342 of the bladed wheel 34. [ As a result, since the motor shaft 22 is not exposed between the decoupling member 37 and the vane wheel 34, a short circuit that occurs due to the attachment of the drain to the motor shaft 22, It is possible to prevent this from rusting. In addition, in order to prevent the drain (D) from adhering to the motor shaft (22), it is not necessary to form a seal member covering the outer peripheral side of the motor shaft (22), and the number of parts can be reduced.

The outer circumferential edge of the collar portion 372 of the tearing member 37 is located radially outward of the through hole 331 and therefore overflows from the through hole 331 and the drain The effect of preventing scattering upward from the upper surface 37 is high.

According to the present example, the juxtaposed member 37 protrudes inward from the inner circumferential surface 371c of the cylindrical portion 371, and when the shaft end portion 342a is press-fitted into the cylindrical portion 371, positioning of the shaft portion 342 And a circular-ring-shaped stopper 373 that contacts the upper end surface 342b to determine the position of the scraping member 37. Therefore, it is possible to mount the trowel member 37 in a state of being positioned at the shaft end portion 342a of the vane wheel 34. [ The attitude of the pick-up member 37 mounted on the shaft end portion 342a can be set to a predetermined attitude by abutting the circular-ring-shaped stopper 373 against the upper end surface 342b of the shaft portion 342 .

In the present example, the pick-up member 37 is provided with a cylindrical tube portion 371, and the shaft portion 342 is press-fitted into the cylindrical portion 371. As a result, since the press-in stand against the shaft portion 342 can be secured long, the rotation or vibration of the pump portion 3, the shock from the outside, loosening due to aged change, The fixing of the tender body member 37 to the shaft end portion 342a becomes stable and strong.

A gap A is formed between the inner peripheral surface 373c of the annular stopper 373 of the decoupling member 37 and the outer peripheral surface of the motor shaft 22 so that the capillary force does not act, It is possible to prevent the drain D from being held between the motor shaft 22 and the relief member 37 by the capillary phenomenon even when the drain D overflowing from the relief member 331 is attached to the relief member 37 have.

Since the shaft portion 342 of the vane wheel 34 is elongated so as to extend upwardly through the through hole 331, the motor shaft 22 to be press-fitted into the shaft portion 342 can be shortened. Therefore, the material cost of the motor shaft 22 can be reduced.

Since the tooth decay member 37 is formed of the same material as the shaft portion 342 of the vane wheel 34 or a material having the same coefficient of linear expansion as the vane wheel 34, The change in the pressure input of the shaft portion 342 of the vane wheel 34 pressed into the cylinder portion 371 of the tractive element 37 is suppressed even when the temperature is changed. Therefore, the state in which the pick-up member 37 is firmly fixed to the shaft end portion 342a is maintained regardless of the temperature change.

(Modified example)

7 is an enlarged view of the vicinity of the shaft portion 342 of the vane wheel 34 of the drain pump of the modification of the first embodiment. In the drain pump 1, the upper end surface 342b of the shaft portion 342 of the vane wheel 34 is used as a positioning portion to fix the tie-up member 37. In the drain pump 1 'of the modified example, Ring shape stepped portion 342c is provided on the outer peripheral side of the axial end portion 342a of the shaft portion 342. The circular ring shaped stepped portion 342c is used as a positioning portion to be connected to the winding member 37, . Since the drain pump 1 'of the modified example has the same configuration as that of the drain pump 1, the same reference numerals are assigned to the corresponding components, and a description thereof will be omitted.

7, the shaft portion 342 has an annular projection 342d having an outer diameter smaller than the outer dimension of the shaft portion and extending coaxially with the shaft portion 342 at an upper end portion thereof. The circular ring shaped stepped portion 342c has an annular circular cross section extending in the direction orthogonal to the axial direction L from the outer peripheral surface 342e of the circular ring shaped projection 342d and the lower end of the circular ring shaped projection 342d 342f. The inner diameter dimension of the annular protrusion 342d is the same as the inner diameter dimension of the large diameter portion 345a of the concave portion 345 of the shaft portion 342 and the inner diameter of the annular protrusion 342d and the large diameter portion 345a are continuous.

The through hole 373b at the center of the annular stopper 373 is formed in the thread member 37 so as to have an inner diameter dimension corresponding to the outer diameter dimension of the annular protrusion 342d.

The shaft end portion 342a of the bladed wheel 34 is pressed into the inside of the cylindrical portion 371 of the scooping member 37 and the circular portion 342a of the shaft portion 342 is press- And the annular stepped portion 342c and the annular stopper 373 are brought into contact with each other. That is, the inner circumferential surface 373c of the annular stopper 373 is brought into contact with the outer circumferential surface 342e of the annular protruding portion 342d, and the inner circumferential surface 373c of the circular- So that the lower end face 373a of the annular stopper 373 is abutted. Thereby, in the state in which the collar portion 372 is positioned at the annular stepped portion 342c of the shaft portion 342 and the predetermined portion of the collar portion 372 that widens in the direction orthogonal to the axial direction L And is attached to the wing car 34 in a posture. Further, the pick-up member 37 is firmly fixed to the vane wheel 34 by press-fitting. In the drain pump 1 'of the modified example, the same operational effect as that of the drain pump 1 can be obtained. The distance between the annular-shaped end face 342f of the annular step portion 342c and the lower end face 373a of the annular stopper 373 and between the outer peripheral face 342e of the annular protruding portion 342d and the annular- The capillary force acts between the inner circumferential surface 373c of the shape stopper 373 and the outer circumferential surface 372c of the annular protrusion 342d and the inner circumferential surface 373c of the circular- The drain D does not reach the motor shaft 22 because the shaft end portion 342a (annular protrusion 342d) extends above the upper surface of the decoupling member 37 .

(Example 2)

Next, with reference to Fig. 8, a drain pump according to the second embodiment in which a tractive element different from the above example is mounted will be described. 8 is a longitudinal sectional view of the pump portion of the drain pump of this embodiment. Since the drain pump 1A of this embodiment includes the same motor unit 2 as the drain pump 1, its illustration is omitted. The pump unit 3 of the drain pump 1A of the present embodiment has the same configuration as that of the pump unit 3 of the drain pump 1 so that the same reference numerals are given to the corresponding components, It is omitted.

In this example, the tearing member 40 is formed of an annular plate having a constant thickness. The bladed wheel 34 is rotatably supported on the outer peripheral surface of the shaft end portion 342a exposed above the bottom plate 361 of the upper pump chamber housing 36 of the pump chamber 33 in the shaft portion 342, And an annular groove 342g.

The shake collecting member 40 is fixed to the shaft end portion 342a by sandwiching the inner circumferential portion 41 thereof in the annular groove 342g. That is, the annular groove 342g is a position determining portion for determining the position of the tooth decubator 40 when the pick-off member 40 is fixed to the shaft end portion 342a, Is fixed to the shaft end portion 342a. When the shake removing member 40 is fixed to the shaft portion 342, the shake removing member 40 is resiliently deformed and press-fitted into the shaft end portion 342a so that the inner circumferential portion 41 thereof is inserted into the annular groove 342g .

In this way, since the shake removing member 40 is plate-shaped, its manufacturing cost can be suppressed. Since the pick-up member 40 is fixed to the shaft end portion 342a by being fitted in the annular groove 342g and positioned on the shaft end portion 342a of the vane wheel 34 And the posture of the pick-up member 37 mounted on the shaft end 342a can be set to a predetermined posture determined in advance. In addition, since the shake collecting member 40 is fitted and fixed in the annular groove 342g, the rotation and vibration of the pump unit 3, the shock from the outside, loosening due to aging, So that the fastening of the pick-off member 37 to the shaft end portion 342a becomes stable and strong. The drain D does not reach the motor shaft 22 because the shaft end portion 342a extends above the upper surface of the trowel member 40. [

In addition, a sealant or an adhesive may be applied to the annular groove 342g in order to improve the sealing of the gap between the shake collecting member 40 and the shaft end 342a. The shake collecting member 37 and the shaft end 342a may be welded together.

(Modified example)

9 is a partial enlarged view of the vicinity of the shaft portion 342 of the vane wheel 34 of the drain pump of the modification of the second embodiment. In the drain pump 1A, the annular groove 342g formed on the outer peripheral surface 342e of the shaft end portion 342a is used as a positioning portion and a fixing portion to fix the scooping member 40, The wing wheel 34 has the annular stepped portion 342c on the outer peripheral side of the shaft end portion 342a of the shaft portion 342 and the annular stepped portion 342c is located at the position So that the pick-up member 37 is fixed as a crystal part. In addition, since the drain pump 1A 'of the modified example has the same configuration as that of the drain pump 1', 1A, the same reference numerals are assigned to the corresponding components, and a description thereof will be omitted.

9, the shaft portion 342 has an annular projection 342d having an outer diameter smaller than the outer dimension of the shaft portion and extending coaxially with the shaft portion 342 at an upper end portion thereof. The annular stepped portion 342c has an annular stepped surface 342d extending in the direction orthogonal to the axial direction L from the outer peripheral surface 342e of the annular protruded portion 342d and the lower end of the annular protruded portion 342d, (Not shown). The inner diameter dimension of the annular protrusion 342d is the same as the inner diameter dimension of the large diameter portion 345a of the concave portion 345 of the shaft portion 342 and the inner diameter of the annular protrusion 342d and the large diameter portion 345a are continuous.

The tearing member 40 is an annular plate, and a circular ring shaped step portion 342c is inserted into the central opening portion 42 and fixed to the shaft end portion 342a by an adhesive or welding. The lower end surface 41a of the inner circumferential portion 41 of the torsion member 40 is engaged with the circular ring-shaped end surface of the annular step portion 342c in the state where the torsion member 40 is mounted on the shaft end portion 342a I have to touch. The collar portion 372 is positioned in the axial direction L by the annular stepped portion 342c of the shaft portion 342 and the collar portion 372 is positioned orthogonal to the axial direction L, To the wing car 34 in a predetermined posture in which the wing wheel 34 extends in the direction in which the wing wheel 34 extends. The inner circumferential surface 41b of the tucker member 40 may be configured to abut the outer circumferential surface 342e of the annular protrusion 342d. The drain D does not reach the motor shaft 22 because the shaft end portion 342a extends above the upper surface of the trowel member 40. [

(Other Embodiments)

In the above example, the tearing member 37 is made of resin, but may be made of metal such as stainless steel.

1, 1 ', 1A, 1A': drain pump
2:
3:
21: mounting arm
22: Motor shaft
23: Lower motor part case
24: upper motor case
25: circuit board
26:
27: Sintered bearing
28: York
29: permanent magnet
30: Aspirator
30a: bottom opening
31: Discharge tube
32: pump chamber housing
33: pump room
34: Wing car
35: Lower pump chamber housing
36: Upper pump chamber housing
37:
38: O ring
40:
41a: bottom face
41: Inner circumference
42:
100: drain pan
101: drain pipe
231: bottom plate
232:
232a: circular ring shape stepped portion
233: Circumferential wall
234: Flange
241: Ceiling board
242: Outer wall
243: Flange
331: Through hole
333: large diameter pump chamber portion
334: Small diameter pump chamber part
341: wing car body
342:
342a:
342b: top surface
342c: an annular shape stepped portion
342d: an annular protrusion
342e:
342f: circle-shaped cross section
342g: circle shape groove
343: Large diameter wing car
343a: wing plate
343b: an annular plate
343c:
344: Small diameter wing car
344a: wing plate
345: recess (recess for motor shaft press fitting)
345a: large diameter portion
345b: small diameter portion
351: bottom plate
352: Outer wall
352a: circular opening
353:
354: Flange
361: bottom plate
362: Inner circumferential wall
363: circle-shaped plate portion
364: outer peripheral wall
365: Slots
366: Small diameter concave
367: large diameter concave portion
371: Cylindrical portion (cylinder portion for press fitting the shaft)
371a: Tapered surface
371b: bottom surface
371c:
372:
372a: Outer edge
373: Circular ring shape stopper
373a: bottom surface
373b: Through-hole
373c:
D: drain
L: Axial direction

Claims (16)

1. A drain pump used in a state in which the pump portion is located below the motor portion, characterized by comprising: a pump portion having a pump chamber and a wing car; and a motor portion having a motor shaft coaxially connected to the wing car,
The vane car has a wing car body disposed in the pump chamber and a coaxial extension extending from the wing car body through a through hole formed in a pump chamber housing for partitioning the pump chamber, And a shaft portion projecting to the outside of the pump chamber,
The shaft portion is formed with a motor shaft press-fitting recessed portion extending downward from the upper end surface of the shaft portion in a coaxial manner,
The shaft end portion is fitted with a water cutting member having a shape widening outwardly from the outer peripheral surface of the shaft end portion,
Wherein the juxtaposed member is fixed to the shaft end,
A shaft-side press-fitting cylinder portion into which the shaft end portion is press-
A collar portion extending outwardly from an outer peripheral surface of the shaft portion press-
And a stopper projecting inward from the inner circumferential surface of the shaft portion press-fitting cylinder portion and contacting the positioning portion of the shaft portion when the shaft end portion is press-fitted into the shaft portion press-fitting cylinder portion,
And the outer peripheral edge of the collar portion is located radially outward of the through hole. delete delete delete The method according to claim 1,
The pump chamber housing includes an annular bottom plate having the through-hole, an inner circumferential wall extending upwardly from the outer circumferential edge of the bottom plate, and a circle extending radially outward from an upper edge of the inner circumferential wall. And an outer circumferential wall extending upwardly from an outer circumferential edge of the circular ring plate portion, wherein a long hole extending long in the circumferential direction at an equi-angular interval is provided in the lower end portion of the outer circumferential wall Lt; / RTI &
And the collar portion is formed above the lower end of the elongated hole. delete The method according to claim 1,
And the positioning portion of the shaft portion is a top surface of the shaft portion. 6. The method of claim 5,
The stopper includes a shaft hole into which the motor shaft is inserted,
And a gap is formed between the motor shaft and the stopper so as to prevent a capillary force from acting. 9. The method of claim 8,
And the gap is formed above the lower end of the elongated hole. The method according to claim 1,
Wherein the motor shaft press-fit concave portion has a large-diameter portion larger in diameter than the motor shaft and a small-diameter portion smaller in diameter than the large-diameter portion and in which the motor shaft is press-fitted in order from the end face side of the shaft portion Wherein the drain pump is connected to the drain pump. The method according to claim 1,
A positioning portion is formed on the outer peripheral side of the shaft end portion,
Wherein the tearing member is fixed to the positioning portion. 12. The method of claim 11,
And the axial end portion extends upwardly from the shake member. delete delete 12. The method of claim 11,
The pump chamber housing includes an annular bottom plate having the through-hole, an inner circumferential wall extending upwardly from the outer circumferential edge of the bottom plate, and a circle extending radially outward from an upper edge of the inner circumferential wall. And an outer circumferential wall extending upwardly from an outer circumferential edge of the circular ring-shaped plate portion, wherein a slit extending in the circumferential direction at an equi-angular interval is formed in the lower end portion of the outer circumferential wall,
Wherein the juxtaposition member is widened outwardly from the positioning portion and has a collar portion whose outer peripheral edge is located radially outward of the through hole,
And the collar portion is formed above the lower end of the elongated hole. delete

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