CN115118068A

CN115118068A - Water discharge pump

Info

Publication number: CN115118068A
Application number: CN202210284693.6A
Authority: CN
Inventors: 佐藤克司; 渡边良树
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2021-03-23
Filing date: 2022-03-22
Publication date: 2022-09-27

Abstract

The invention provides a drain pump capable of effectively reducing vibration transmission to a mounting component without increasing the number of parts. A drain pump (10) is provided with: a motor (28); a housing (20) that houses a pump driven by a motor (28); a lower cover (22); an upper cover (30); a mounting portion (38) provided to the upper cover (30) and used for mounting the upper cover (30) to the mounting member (34); and a plurality of protrusions (50, 54) that are provided inside the lower cover (22) and the upper cover (30) and that support the motor (28) by making point contact with the motor (28).

Description

Water discharge pump

Technical Field

The invention relates to a drainage pump.

Background

For example, in an indoor unit of a ceiling-mounted air conditioner, moisture in air condenses during a cooling operation and adheres to a heat exchanger, and water droplets generated by the adhered moisture drip into a drain pan provided below the heat exchanger. A drain pump (also referred to as a discharge pump) is used to discharge the drain accumulated in the drain pan to the outside of the indoor unit (outdoors) (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication No. 2012 and 082790

Technical problem to be solved by the invention

However, the drain pump using the motor has the following cases: vibration generated from the motor propagates to an indoor unit of the air conditioner as a mounting member and generates noise, thereby deteriorating quietness. Therefore, when the drain pump as described in patent document 1 is mounted to the indoor unit, for example, vibration-proof rubber or the like (also referred to as a vibration-proof bush) is disposed between the mounting portion of the drain pump and the mounting top plate of the indoor unit to reduce propagation of vibration.

However, when rubber for vibration damping or the like is used to cope with noise, the number of parts increases and the cost of parts increases. On the other hand, in recent years, in order to reduce the number of parts and the cost of parts, cases have been increasing in which (a mounting portion of) the drain pump is directly mounted to (a mounting top plate of) the indoor unit without using vibration-proof rubber or the like.

Disclosure of Invention

In view of the above, the present invention provides a drain pump capable of effectively reducing the propagation of vibration to a mounting member without increasing the number of parts.

Means for solving the problems

The drain pump according to claim 1 includes: a motor; a housing that houses a motor and a pump driven by the motor; a mounting portion provided to the housing and configured to mount the housing to a mounting member; and a plurality of protrusions provided inside the housing and in point or line contact with the motor to support the motor.

The drain pump according to claim 1 includes a motor and a housing that houses the pump driven by the motor. In other words, the drain pump includes a motor and a casing constituting a pump driven by the motor.

In the drain pump according to claim 1, since the motor is supported inside the housing by the projection in point contact or line contact with the motor, the contact area between the motor and the housing is reduced as compared with the case of supporting the motor by surface contact, and the propagation of vibration to the mounting member can be effectively reduced without increasing the number of parts or the cost of the parts. This can suppress vibration of the mounting member, thereby reducing noise.

In the drain pump according to claim 2 of the invention according to claim 1, the protrusion is provided at least on an inner surface of the housing on the mounting portion side.

In the drain pump, vibration of the motor is propagated to the mounting member in the order of the housing and the mounting portion. Further, since the mounting portion is attached to at least the mounting member, it is effective to suppress vibration of the portion of the housing to which the mounting portion is attached, and to make the mounting member less likely to vibrate.

In the drain pump according to claim 2, since the protrusion is provided on the inner surface of the mounting portion side of the casing, it is possible to effectively suppress propagation of vibration to the portion to which the mounting portion of the casing is mounted.

The invention described in claim 3 is the drain pump according to claim 1 or 2, wherein the protrusion is formed in any one of a hemispherical shape, a cylindrical shape, a conical shape, and a truncated conical shape.

In the drain pump according to claim 3, since the protrusion is formed in any one of a hemispherical shape, a cylindrical shape, a conical shape, and a truncated conical shape, the protrusion can be brought into point contact with the motor with a simple structure.

The invention described in claim 4 provides the drain pump according to any one of claims 1 to 3, wherein the plurality of projections are arranged in a circle with an axis of the motor as a center.

In the drain pump according to claim 4, the plurality of projections are arranged on a circle in a dispersed manner around the axial center of the motor, whereby the vibration mode of the pump casing can be changed. In addition, the motor can be stably supported.

The invention described in claim 5 provides the drain pump according to any one of claims 1 to 4, wherein the plurality of projections are arranged on a plurality of concentric circles having different radii, with an axis of the motor as a center.

In the drain pump according to claim 5, the plurality of projections are arranged on a plurality of concentric circles having different radii, with the axis of the motor as a center, whereby the vibration mode of the pump housing can be changed. In addition, the motor can be stably supported.

The invention described in claim 6 provides the drain pump according to claim 5, wherein the plurality of projections arranged in a dispersed manner on one concentric circle and the plurality of projections arranged in a dispersed manner on another concentric circle are provided, and the plurality of projections arranged in a dispersed manner on one concentric circle and the plurality of projections arranged in a dispersed manner on another concentric circle are provided at different angular positions in a circumferential direction.

In the drain pump according to claim 6, the plurality of projections arranged in a distributed manner on one concentric circle and the plurality of projections arranged in a distributed manner on the other concentric circle are provided at different angular positions in the circumferential direction, whereby the vibration mode of the pump housing can be changed.

The invention described in claim 7 provides the drain pump according to any one of claims 1 to 6, wherein the projection is formed on an annular rib formed on an inner surface of the casing.

In the drain pump according to claim 7, since the annular rib is formed on the inner surface of the casing, the rigidity of the casing can be improved as compared with the case where the annular rib is not formed, and the vibration mode of the pump casing can be changed while the casing is made less likely to vibrate as compared with the case where the annular rib is not formed.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the drain pump of the present invention, the propagation of vibration to the mounting member can be effectively reduced without increasing the number of parts.

Drawings

Fig. 1 is a side view showing a drain pump according to an embodiment of the present invention, partially in cross section.

Fig. 2 is a perspective view showing the drain pump according to the embodiment.

Fig. 3 a is a plan view showing the lower cover, and fig. 3B is a sectional view of the lower cover (sectional view taken along line 3B-3B of fig. 3 a).

Fig. 4 (a) is a perspective view showing the upper cover viewed upside down, and fig. 4 (B) is a bottom view of the upper cover viewed from below.

Fig. 5 is a side view showing a part of a drain pump of a conventional example in a cross section.

Fig. 6 is a graph showing the measurement result of noise.

Fig. 7 (a) is a perspective view showing an upper cover of another embodiment viewed from above and below, and fig. 7 (B) is a bottom view of the upper cover shown in fig. 7 (a).

Fig. 8 (a) is a perspective view showing an upper cover of another embodiment viewed from above and below, and fig. 8 (B) is a bottom view of the upper cover shown in fig. 8 (a).

Fig. 9 (a) is a perspective view showing an upper cover of another embodiment viewed from above and below, and fig. 9 (B) is a bottom view of the upper cover shown in fig. 9 (a).

Fig. 10 (a) is a perspective view showing an upper cover of another embodiment viewed from above and below, and fig. 10 (B) is a bottom view of the upper cover shown in fig. 10 (a).

Fig. 11(a) is a perspective view showing an upper cover of another embodiment viewed from above and below, and fig. 11 (B) is a bottom view of the upper cover shown in fig. 11 (a).

Fig. 12 is a perspective view of an upper cover of another embodiment viewed from above.

Description of the symbols

10 drainage pump

22 lower cover (casing)

28 electric machine

30 upper cover (casing)

34 mounting top board (mounting component)

36 mounting part

38 mounting part

40 mounting part

50 projection

54 projection

56 projection

Detailed Description

A drain pump 10 according to an embodiment of the present invention will be described with reference to fig. 1 to 4. In the figure, arrow Z indicates an upward direction of the drain pump 10, arrow Y indicates a direction orthogonal to arrow Z, and arrow X indicates a direction orthogonal to arrow Z and to arrow Y. The direction of the arrow X is, for example, a direction opposite to a direction in which the discharge port 18 described later protrudes.

As shown in fig. 1, the drain pump 10 according to the embodiment sucks up the drain water W accumulated in the drain pan 12 and discharges the drain water W to the outside.

As shown in fig. 1 and 2, the drain pump 10 includes: a pump chamber 14, the pump chamber 14 accommodating a rotary vane (not shown) as an example of a pump; a tubular suction port 16, the suction port 16 being provided at a lower portion of the pump chamber 14; and a synthetic resin housing 20, and a tubular discharge port 18 extending laterally from the pump chamber 14 is formed in the housing 20. The pump according to the present embodiment is a pump of a rotary-vane type, but may be a pump of another known structure, and the pump type is not particularly limited.

A cylindrical synthetic resin lower cover (also referred to as a housing cover) 22 is attached to an upper portion (upper opening) of the housing 20 via an O-ring (not shown) as a sealing member. The lower cover 22 is detachably attached to the housing 20 by a snap function using an elastic force of a snap arm 24 provided in the housing 20.

A motor 28 including a stator, a rotor, and the like is mounted on an upper portion of the lower cover 22 so that a lead wire drawing portion 26 for drawing a lead wire 26A is exposed to the outside. A drive shaft of the motor 28 is coupled to a rotary shaft of a rotary vane (not shown) disposed in the pump chamber.

A short cylindrical synthetic resin upper cover (also referred to as a motor cover) 30 is attached to an upper portion (upper opening) of the lower cover 22, and the upper cover 30 includes a ceiling portion 30A covering an upper side of the motor 28. The upper cover 30 is detachably attached to the lower cover 22 with the motor 28 interposed therebetween by a snap function using an elastic force of a snap arm 32 provided to the upper cover 30. The housing 20, the lower cover 22, and the upper cover 30 are examples of the case of the present invention.

The foot-shaped mounting

portions

36, 38, and 40 are formed by integral molding on the upper portion (ceiling portion 30A) of the upper cover 30, and the mounting

portions

36, 38, and 40 are used to mount the drain pump 10 to the mounting top plate 34, which is an example of a mounting portion in the indoor unit. Insertion holes 44 into which screws (not shown) for fastening and fixing are inserted are formed in fixing plate portions 42 extending horizontally outward from the upper ends of the mounting

portions

36, 38, 40. The drain pump 10 is fixed (fastened) to the mounting top plate 34 by screwing (fastening) the screw inserted through the insertion hole 44 to the mounting top plate 34 (a screw hole (not shown) provided in the mounting top plate 34).

In the drain pump 10, when the rotary vane housed in the casing 20 (pump chamber) by the motor 28 is rotated while being fixed to the mounting top plate 34 of the indoor unit of the air conditioner by the mounting

portions

36, 38, and 40, the drain water W accumulated in the drain pan 12 is sucked up from the suction port 16 and is discharged from the discharge port 18 via the pump chamber. The discharged drain water W is once guided upward through the pipe 46 connected to the discharge port 18, and then guided sideways to be discharged outdoors.

As shown in fig. 3, a hole 48 through which a drive shaft of the motor 28 is inserted is formed in the center of the bottom surface portion 22A of the lower cover 22, and a stepped portion 22Ba is formed on the upper end side of the cylindrical portion 22B rising from the bottom surface portion 22A.

On the upper surface of the stepped portion 22Ba, projections 50 for supporting the lower surface of the motor 28 in a dot shape are disposed (in a dot shape) on a concentric circle concentric with the hole 48 at an equal angular pitch (at equal angular intervals) except for a part thereof.

The protrusion 50 of the present embodiment is formed in a hemispherical shape as an example, and the top of the protrusion 50 is in point contact with the lower surface of the motor 28. The projection 50 is integrally formed with the lower cover 22.

As shown in fig. 1 and 4, an annular rib 52 is integrally formed on the disc-shaped ceiling portion 30A of the upper cover 30, and a plurality of projections 54 that support the upper surface of the motor 28 in a dot shape are arranged on the lower surface of the rib 52 in a dispersed manner at equal angular intervals (at equal angular intervals).

The protrusion 54 of the present embodiment is formed in a hemispherical shape, for example, and the top of the protrusion 54 is in point contact with the upper surface of the motor 28. The projection 54 is formed integrally with the upper cover 30.

Further, gaps (not shown in fig. 1) are provided between the outer peripheral surface of the motor 28 and the inner peripheral surface of the lower cover 22 and between the outer peripheral surface of the motor 28 and the inner peripheral surface of the upper cover 30 so that the outer peripheral surface of the motor 28 does not contact the inner peripheral surface of the upper cover 30 and the inner peripheral surface of the lower cover 22. Therefore, the motor 28 is supported only by the point contact of the

projections

50 and 54 with the lower cover 22 and the upper cover 30. Further, only one of the

projections

50 and 54 may be supported by point contact with the lower cover 22 and the upper cover 30.

(action, Effect)

Next, the operation and effect of the drain pump 10 according to the present embodiment will be described.

The mounting

portions

36, 38, and 40 of the drain pump 10 according to the present embodiment are fixed to the mounting top plate 34 of the indoor unit of the air conditioner, and when the rotary vane housed in the casing 20 (the pump chamber 14) is rotated by the motor 28, the drain water W accumulated in the drain pan 12 is sucked up from the suction port 16 and is discharged from the drain port 18 via the pump chamber 14. The discharged drain water W is discharged to the outside through the pipe 46 connected to the discharge port 18.

At this time, although the vibration generated from motor 28 is transmitted to mounting

portions

36, 38, and 40 via lower cover 22 and upper cover 30, the vibration is reduced as described below and propagates to mounting top plate 34.

Although the vibration of the motor 28 propagates to the lower cover 22, since the lower surface of the motor 28 is in point contact with the protrusion 50, the contact area is greatly reduced as compared with the case where the lower surface of the motor 28 is in surface contact with the lower cover 22, and thus the propagation of the vibration to the lower cover 22 is suppressed.

Further, although the vibration of the motor 28 propagates to the upper cover 30, the upper surface of the motor 28 is in point contact with the projection 54, and therefore the contact area is significantly reduced compared to the case where the upper surface of the motor 28 is in surface contact with the upper cover 30, and the propagation of the vibration to the upper cover 30 is suppressed.

In this way, since the propagation of the vibration of motor 28 to lower cover 22 and upper cover 30 is suppressed, the propagation of the vibration to mounting top plate 34 via mounting

portions

36, 38, and 40 is also suppressed.

By reducing the propagation of vibration of the motor 28 to the top panel 34 of the indoor unit of the air conditioner, the propagation of vibration to the indoor unit can be effectively reduced without increasing the number of parts and the cost of parts, and the noise of the air conditioner can be reduced.

[ test examples ]

In order to confirm the effect of the present invention, the drain pump of the conventional example and the drain pump applied to the embodiment of the present invention were prepared, and the effect of reducing noise was confirmed.

The drain pump having the structure of the above embodiment was used in the test.

As shown in fig. 5, the drain pump 100 of the conventional example uses the lower cover 122 and the upper cover 130 which are not provided with the protrusion 50 and the protrusion 54 described in the above embodiment, and supports the motor 28 by surface-contacting the motor 28 with the lower cover 122 and the upper cover 130.

In the test, the drain pump was attached to the mounting top plate, and the noise generated when the motor was driven was measured using a noise meter. In the graph showing the measurement results shown in fig. 6, the vertical axis represents the noise level and the horizontal axis represents the frequency of the noise.

From the test results shown in fig. 6, it was found that the use of the drain pump applied to the embodiment of the present invention (countermeasure), compared with the use of the drain pump of the conventional example, can reduce the noise level.

[ other embodiments ]

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above description, and various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the protrusion 54 of the upper cover 30 has a hemispherical shape, but the shape of the protrusion 54 is not limited to the above embodiment, and may be, for example, a short cylindrical shape as shown in fig. 7 (a) and (B) or a conical shape (or a truncated conical shape) as shown in fig. 8 (a) and (B). Although not shown, the projection 50 of the lower cover 22 may have a short cylindrical shape or a conical shape (or a truncated cone shape) similar to the projection 54.

In the above embodiment, the hemispherical protrusions 54 are annularly arranged in a dispersed manner, but as shown in fig. 9 (a) and (B), the hemispherical protrusions 54 may be arranged in a dispersed manner on the

ribs

52A and 52B having different radii. In this case, the plurality of protrusions 54 dispersedly disposed on the rib 52A and the plurality of protrusions 54 dispersedly disposed on the concentric circles on the other rib 52B may be disposed at the same angular position (circumferential position) and may be in phase with each other in the circumferential direction, or may be disposed at different angular positions (circumferential positions) and may be in phase with each other in the circumferential direction.

Further, as shown in fig. 10 (a) and (B), the short columnar protrusions 54 may be arranged in a dispersed manner on the ceiling portion 30A in concentric circles having different radii, or as shown in fig. 11(a) and (B), the distal end of the linear cross-sectional mountain-shaped protrusion 54 having a constant height may be brought into line contact with the motor 28. Although not shown, the protrusion 50 of the lower cover 22 may have the same cross-sectional shape as the protrusion 54 of the upper cover 30.

In the case of line contact, since the contact area is reduced compared to the case of surface contact, propagation of vibration can be suppressed similarly to point contact.

It is needless to say that the shape, number, arrangement, and the like of the projections 50 and the projections 54 are not limited to those of the above embodiment.

Further, the ribs 52 may be provided as needed, and the rigidity of the upper cover 30 can be adjusted by the presence or absence of the ribs 52, the width of the ribs 52, the height of the ribs 52, the number of the ribs 52, and the like, and the vibration mode can be changed. For example, the vibration mode can be changed so that the attachment top plate 34 does not resonate.

Further, it is preferable that the contact area of the point contact portion and the line contact portion with each protrusion is 2mm2 or less.

In the above embodiment, the motor 28 is supported only by the projection 50 and the projection 54, but for example, as shown in fig. 12, a cross-sectional mountain-shaped projection 56 linearly extending in the axial direction may be provided on the inner peripheral surface of the upper cover 30 at intervals in the circumferential direction, and the motor 28 may be supported by bringing the outer peripheral surface of the motor 28 into contact with the top of the projection 56.

Although not shown, a projection may be provided on the outer surface of the motor 28, and the motor 28 may be supported by bringing the projection of the motor 28 into point contact with the lower cover 22 and the upper cover 30.

Claims

1. A drain pump is characterized by comprising:

a housing that houses a motor and a pump driven by the motor;

a mounting portion provided to the housing and configured to mount the housing to a mounting member; and

a plurality of protrusions provided inside the housing and in point or line contact with the motor to support the motor.

2. A drain pump according to claim 1,

the projection is provided at least on an inner surface of the housing on the mounting portion side.

3. A drain pump according to claim 1 or 2,

the protrusion is formed in any one of a hemispherical shape, a cylindrical shape, a conical shape, and a truncated conical shape.

4. Drain pump according to any of claims 1-3,

the plurality of projections are arranged on a circle in a dispersed manner with the axis of the motor as a center.

5. A drain pump according to claim 4,

the plurality of protrusions are disposed on a plurality of concentric circles having different radii, with the axis of the motor as a center.

6. A drain pump according to claim 5,

the projection-type heat exchanger includes the plurality of projections arranged in a distributed manner on one concentric circle and the plurality of projections arranged in a distributed manner on the other concentric circle,

the plurality of protrusions arranged in a dispersed manner on one concentric circle and the plurality of protrusions arranged in a dispersed manner on the other concentric circle are provided at different angular positions in the circumferential direction.

7. Drain pump according to any of claims 1-6,

the projection is formed on an annular rib formed on an inner surface of the housing.