JP7485388B2 - Drainage pump - Google Patents

Description

The present invention relates to a drainage pump that sucks up and discharges water.

For example, the indoor unit of an air conditioner that is attached to the ceiling of a building collects drain water generated during operation in a drain pan, and then uses a drainage pump to suck up the water and discharge it outside.

An example of this type of drainage pump is disclosed in the following Patent Document 1. This drainage pump is equipped with a pump body having a suction port, a discharge port, and a pump chamber communicating with them, a rotor blade disposed in the pump chamber, a motor for rotating the rotor blade, and a motor support member fixed to the top of the pump body and supporting the motor.

JP 2008-291780 A

In the drainage pump described above, noise generated within the pump chamber, specifically the paddling noise caused by the rotating blades stirring the water, enters the inside of the cylindrical motor receiving member, and the noise that enters the inside of the motor receiving member passes through the wall of the motor receiving member and is transmitted to the outside.

The object of the present invention is to provide a drainage pump that can reduce noise transmitted through the wall surface of the motor receiving member.

The drainage pump according to claim 1 comprises a pump body having a suction port, a discharge port, and a pump chamber communicating with the suction port and the discharge port and having an open top, a rotor blade disposed in the pump chamber, a motor for rotating the rotor blade, a lid disposed on the top of the pump body, covering the opening of the pump body, and having an opening through which a torque transmission member for transmitting the rotational driving force of the motor to the rotor blade passes, and a motor support member provided on the upper surface of the lid and supporting the motor at the top, and having a drainage channel formed to communicate the inside and outside of the cylindrical part, the cylindrical part having a radially inner inner wall surface and a radially outer outer wall surface, and a closed space is provided between the inner wall surface and the outer wall surface.

In the drainage pump described in claim 1, the drainage water sucked in through the suction port can be discharged from the discharge port by rotating the rotating blades arranged in the pump chamber with a motor.

When the rotor blades rotate inside the pump chamber, the sound of stirring the water inside the pump chamber is generated. The noise generated inside the pump chamber enters the cylindrical portion of the motor receiving member through an opening formed in the lid of the motor receiving member.

Part of the noise that enters the cylindrical section is transmitted to the outside of the cylindrical section via the drainage channel, and the other part passes through the cylindrical section and is transmitted to the outside.

In the drainage pump of claim 1, the cylindrical portion has an inner wall surface on the radial inside and an outer wall surface on the radial outside, and a closed space is provided between the inner wall surface and the outer wall surface, so that noise transmitted through the cylindrical portion can be reduced compared to when the cylindrical portion is formed by a single wall surface.

The invention described in claim 2 is the drainage pump described in claim 1, in which the cylindrical portion has a space between the inner wall surface and the outer wall surface that is open at the top, and the closed space is formed by blocking the opening of the space with the motor.

In the drainage pump described in claim 2, the cylindrical portion has a space between the inner wall surface and the outer wall surface that is open at the top, and the opening of the space is closed by closing it with the motor to form a closed space.

The drainage pump described in claim 3 is the drainage pump described in claim 2, which includes an inner cylinder that forms the inner wall surface, and an outer cylinder that forms the outer wall surface and is formed higher than the inner cylinder, and the motor inserted into the outer cylinder is placed on the upper end of the inner cylinder to close the opening.

In the drainage pump described in claim 3, the outer cylinder is formed higher than the inner cylinder, and by inserting the motor into the outer cylinder and placing the motor on the upper end of the inner cylinder, the opening between the upper end of the inner cylinder and the outer cylinder can be blocked, and the space between the outer cylinder and the inner cylinder can be made into a closed space.

The invention described in claim 4 is the drainage pump described in claim 2 or claim 3, in which the space is filled with soundproofing material.

The cylindrical portion of the drainage pump described in claim 4 has a space filled with sound-proofing material, so noise is less likely to pass through compared to a cylindrical portion in which the space is not filled with sound-proofing material.

The drainage pump of the present invention can reduce noise transmitted through the wall surface of the motor receiving member.

1A is a front view showing a drainage pump according to a first embodiment of the present invention, and FIG. 1B is a plan view showing the drainage pump shown in FIG. 1A. FIG. FIG. 2 is a longitudinal sectional view showing the drainage pump along its axis. 11 is an explanatory diagram showing a configuration for fixing a molded motor and a motor receiving member. FIG. 4 is a horizontal cross-sectional view of the drainage pump (cross-sectional view taken along line 4-4 in FIG. 2). FIG. 4 is an enlarged view showing a main part of FIG. 3 . 6 is a vertical cross-sectional view (cross-sectional view taken along line 6-6 in FIG. 4) showing a portion of the tubular member. FIG. 4 is a horizontal cross-sectional view showing a drainage pump according to a comparative example. FIG. 5 is a horizontal cross-sectional view showing a drainage pump according to a second embodiment of the present invention.

[First embodiment]
As shown in Figures 1 and 2, the drainage pump 1 has a pump body 10 made of synthetic resin. The pump body 10 has a suction port 12 that protrudes downward, a discharge port 16 that protrudes horizontally, and a pump chamber 14 that communicates with the suction port 12 and the discharge port 16.

A rotating blade 20 is disposed in the pump chamber 14. The rotating blade 20 includes a mounting shaft 21 as an example of a rotational force transmission member, a plurality of large diameter blades (not shown) extending radially from the mounting shaft 21, a plurality of small diameter blades 22 extending axially downward from each large diameter blade, a disk 23 connecting the lower edges of the plurality of large diameter blades and having an opening in the center, and a ring 24 connecting the outer peripheries of the plurality of large diameter blades. An output shaft 110 of a molded motor 100 described later is press-fitted into a mounting hole (not shown) formed in the center of the mounting shaft 21. When the molded motor 100 is driven, the rotating blade 20 rotates in the pump chamber 14. The molded motor 100 is an example of a motor of the present invention.

The top surface of the pump body 10 is open, and a motor receiving member 50 made of synthetic resin is attached to cover this opening. The motor receiving member 50 is connected to the pump body 10 by a pair of hook-shaped mounting parts 80 that are integrally molded with the pump body 10. The motor receiving member 50 has a lid part 52 that covers the opening of the pump body 10, and an O-ring 40 is disposed between the lid part 52 and the pump body 10.

The cover 52 has an opening 54 in the center through which the mounting shaft 21 of the rotor blade 20 passes. An annular gap G is provided between the mounting shaft 21 and the opening 54. When the drainage pump 1 is stopped, some of the drainage water may flow back and spurt out into the pump chamber 14 and the motor support member 50 above through the gap G. However, the drain 30 attached between the mounting shaft 21 and the output shaft 110 prevents the drainage water spurting out from the gap G from splashing toward the molded motor 100. Water that enters the motor support member 50 is discharged to the outside of the motor support member 50 through the drainage channel 68 described below.

A cylindrical section 60 having a double-tube structure is integrally formed on the upper part of the lid section 52. The cylindrical section 60 includes an inner tube 56 and an outer tube 58 that is spaced apart radially outward from the inner tube 56. The inner tube 56 constitutes the inner wall surface of the cylindrical section 60, and the outer tube 58 constitutes the outer wall surface of the cylindrical section 60.

In this embodiment, the cylindrical portion 60 is formed such that the inner cylinder 56 is lower than the outer cylinder 58, and as shown in FIG. 3, the molded motor 100 is inserted into the outer cylinder 58, and as shown in FIG. 2, the molded motor 100 inserted into the outer cylinder 58 is mounted and supported on the upper end of the inner cylinder 56.

As shown in FIG. 4, the inner tube 56 is formed with a pair of slit-shaped openings 62. The outer tube 58 is formed with a pair of openings 64 at positions circumferentially spaced apart from positions facing the openings 62 of the inner tube 56.

The outer tube end at one circumferential end of the opening 64 and the outer circumferential surface of the inner tube 56 are integrally connected by a partition wall 66, and both circumferential ends of the arc-shaped space S between the outer tube end and the inner tube 56 are blocked by the partition wall 66.

As shown in Figures 4 and 6, the gap between the opening 64 of the outer tube 58 and the opening 62 of the inner tube 56 is a drainage channel 68 for discharging water that has entered the internal space of the inner tube 56 of the motor receiving member 50 to the outside of the motor receiving member 50.

As shown in FIG. 2, when the molded motor 100 is inserted into the outer cylinder 58 and the molded motor 100 is mounted on the upper end of the inner cylinder 56, the opening between the upper end of the inner cylinder 56 and the inner peripheral surface of the outer cylinder 58 is blocked, and the space S surrounded by the lid portion 52, the outer cylinder 58, the inner cylinder 56, and the partition wall 66 is sealed to form a closed space.

As shown in FIG. 1, a number of mounting legs 70 that protrude upward and outward are integrally formed on the upper end of the outer cylinder 58. The mounting legs 70 have mounting holes 72 through which screws pass to secure the drainage pump 1 to the indoor unit.

Attachment holes 90 are formed at the upper end of the outer tube 58 at positions corresponding to the mounting legs 70. As shown in Figures 3 and 5, in this embodiment, the attachment holes 90 are formed as square holes. The attachment holes 90 and the protrusions 130 of the molded motor 100 constitute a fixing means for removably fixing the molded motor 100 to the outer tube 58 of the cylindrical portion 60 by snap-fit connection.

Three protrusions 130 are integrally molded on the outer periphery of the upper part of the molded motor 100. As shown in FIG. 5, the lower surface of the protrusions 130 is an inclined surface 132. When the molded motor 100 is inserted into the outer cylinder 58 with each protrusion 130 aligned with the mounting hole 90 of the outer cylinder 58, the bottom surface of the molded motor 100 abuts against the upper end of the inner cylinder 56, and the protrusions 130 fit into the mounting hole 90 at almost the same time, and the molded motor 100 is fixed inside the outer cylinder 58. The outer cylinder 58 elastically deforms in the radial direction, so that the protrusions 130 are connected to the mounting hole 90 by a so-called snap fit connection when the molded motor 100 is pushed into the outer cylinder 58.

(Action, Effect)
In the drainage pump 1 of this embodiment, when the molded motor 100 is driven and the rotating blades 20 rotate within the pump chamber 14 , water sucked in through the suction port 12 is discharged from the discharge port 16 .

Noise generated by the rotating blades 20 rotating inside the pump chamber 14 enters the inside of the motor receiving member 50 through the gap G between the mounting shaft 21 and the opening 54. As shown in FIG. 4, part of the noise that enters the inside of the motor receiving member 50 is transmitted to the outside through the drainage channel 68 as shown by arrow A, and the other part is transmitted to the outside through the inner tube 56 and outer tube 58 of the cylindrical portion 60 as shown by arrow B.

Figure 7 shows a drainage pump 200 according to a comparative example. The same components as those in this embodiment are given the same reference numerals and their description will be omitted. The drainage pump 200 according to the comparative example has an inner cylinder 56 and an outer cylinder 58, and a continuous annular space S1 is formed between the inner cylinder 56 and the outer cylinder 58 in the circumferential direction. This space S1 communicates with an opening 62 formed in the inner cylinder 56 and also communicates with an opening 64 formed in the outer cylinder 58.

In the drainage pump 200 of the comparative example, similar to the drainage pump 1 of the present embodiment, noise enters the interior of the inner cylinder 56 from the opening 54 of the lid portion 52. A portion of the noise that enters the interior of the inner cylinder 56 passes through the opening 62 of the inner cylinder 56, the space S1, and the opening 64 of the outer cylinder 58 as shown by arrow C and is transmitted to the outside, while another portion passes through the inner cylinder 56 and then the opening 64 of the outer cylinder as shown by arrow D and is transmitted to the outside.

As shown in FIG. 7, in the drainage pump 1 of this embodiment, the space S of the cylindrical portion 60 is a closed space, and the noise that passes through the inner tube 56 is further transmitted through the outer tube 58 before being transmitted to the outside. This reduces the noise level outside the motor receiving member 50 compared to the drainage pump 200 of the comparative example, in which the noise that passes through the inner tube 56 is transmitted directly to the outside via the opening 64 of the outer tube 58.

Second Embodiment
Next, a drainage pump 1 according to a second embodiment of the present invention will be described with reference to Fig. 8. Note that the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.
As shown in FIG. 8 , in the drainage pump 1 of this embodiment, the space S of the cylindrical portion 60 is filled with a sound-proofing material 140 .

As the sound insulation material 140, for example, a fibrous material (glass wool, rock wool, natural fiber, etc.), putty, mortar, etc. can be used. To enhance the sound insulation effect, it is preferable to use a material with a large specific gravity for the sound insulation material 140, and for example, it is preferable to use a material with a larger specific gravity than the material constituting the motor receiving member 50. When using putty, metal powder may be mixed into the putty.

[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention.

In the drainage pump 1 of the above embodiment, the cylindrical portion 60 has a double-pipe structure, but it may have a multiple-pipe structure made up of three or more pipes with different diameters.
And, the closed space may be formed by two of the three or more cylinders that are opposed to each other in the radial direction. In the drainage pump 1 of the above embodiment, the upper opening between the inner cylinder 56 and the outer cylinder 58 is closed by the molded motor 100, but the upper opening between the inner cylinder 56 and the outer cylinder 58 may be closed by something other than the molded motor 100. For example, the upper opening between the inner cylinder 56 and the outer cylinder 58 may be closed by a wall portion.
In the drainage pump 1 of the above embodiment, the cylindrical portion 60 includes a plurality of cylinders, specifically, two cylinders, and a closed space is formed between the two cylinders. However, the present invention is not limited to a configuration in which the cylindrical portion 60 includes a plurality of cylinders. In another example, the cylindrical portion 60 may include one cylinder, and a closed space may be formed within the thickness of the cylinder. In such a drainage pump 1, for example, the cylindrical portion 60 may be made of a material that forms a closed space inside when hardened, such as a foamed resin. Alternatively, one or more closed spaces may be formed inside the cylindrical portion 60 by forming the pump body 10 with a 3D printer. The manufacturing method of the cylindrical portion 60 is not limited.
In this manner, by configuring the cylindrical portion 60 to have a single tube, the rigidity of the cylindrical portion 60 itself can be improved, and as a result, the rigidity of the drainage pump 1 can be improved.

REFERENCE SIGNS LIST 1 Drain pump 10 Pump body 12 Suction port 14 Pump chamber 16 Discharge port 21 Mounting shaft (rotational force transmission member)
20 Rotating blade 50 Motor receiving member 52 Lid portion 54 Opening portion 56 Inner cylinder (inner wall surface)
58 Outer cylinder (outer wall surface)
60: Cylindrical portion 68: Drainage channel 100: Molded motor (motor)
140 Soundproofing material

Claims (4)

a pump body including a suction port, a discharge port, and a pump chamber communicating with the suction port and the discharge port and having an open upper portion;
A rotating blade disposed in the pump chamber;
A motor that rotates the rotor blades;
a motor receiving member including a lid portion disposed on an upper portion of the pump body, covering an opening of the pump body, and having an opening through which a rotational force transmission member for transmitting a rotational driving force of the motor to the rotor blades passes, and a cylindrical portion disposed on an upper surface of the lid portion and supporting the motor at an upper portion, the cylindrical portion having a drainage passage formed therein to communicate the inside and the outside;
Equipped with
The cylindrical portion has a radially inner wall surface and a radially outer wall surface, and a closed space is provided between the inner wall surface and the outer wall surface.
Drain pump. The cylindrical portion has a space between the inner wall surface and the outer wall surface, the space having an open upper portion,
The closed space is formed by closing an opening of the space with the motor.
The drainage pump according to claim 1. An inner cylinder that constitutes the inner wall surface;
an outer cylinder that constitutes the outer wall surface and is formed higher than the inner cylinder;
Equipped with
The motor inserted into the outer cylinder is placed on the upper end of the inner cylinder to close the opening.
The drainage pump according to claim 2. The space is filled with a sound-insulating material.
The drainage pump according to claim 2 or 3.