WO2021186955A1

WO2021186955A1 - Drain water pump

Info

Publication number: WO2021186955A1
Application number: PCT/JP2021/004836
Authority: WO
Inventors: 克司佐藤; 友也加藤
Original assignee: 株式会社不二工機
Priority date: 2020-03-17
Filing date: 2021-02-09
Publication date: 2021-09-23
Also published as: CN115280021A; JP2023181205A; JP7367982B2; JP2021148030A

Abstract

This drain water pump includes: a motor; and a pump unit provided with a housing, a rotating blade, and a cover. The housing is open at an upper section thereof and is provided with a suction port on a lower end section thereof and a discharge port on a side section thereof. The rotating blade is coupled to the motor. The cover has a through hole in a center section thereof and is attached to an upper end section of the housing. The housing and the cover define a pump chamber. The discharge port has a discharge port inlet that opens through an inner peripheral surface of the pump chamber so as to straddle a joint region where an inner peripheral surface formed by the housing and an inner peripheral surface formed by the cover are joined. A corner section of the discharge port inlet is chamfered, the corner section being positioned at a boundary between the inner peripheral surface of the housing and an inner surface of the discharge port.

Description

Drainage pump

The present disclosure relates to a drainage pump, and particularly to a drainage pump suitable for draining the drain water in the drain pan that receives the condensed water in the indoor heat exchanger of the air conditioner to the outside.

As disclosed in Japanese Patent Application Laid-Open No. 2016-11941, in the conventional air conditioner embedded in the ceiling of a room, a drain pan that accepts drain water condensed on the surface of the indoor heat exchanger of the air conditioner is used. Equipped. A drainage pump (drain pump) is used to drain the drain water in the drain pan to the outside.

This drainage pump consists of a motor and a pump body. The pump body has a housing with an open upper part, a suction port at the lower end, and a discharge port on the side composed of a substantially cylindrical inner peripheral wall, a rotary blade connected to a motor, and a central part. Has a through hole and is provided with a cover attached to the upper end of the housing. In addition, the pump chamber is defined by the housing and the cover. The discharge port is provided with a discharge port inlet that opens into the pump chamber.

However, in the above-mentioned conventional example, an acute-angled, right-angled, or obtuse-angled corner is formed at the portion (outer corner portion) where the discharge port inlet opens into the pump chamber due to the die punching structure for molding the housing. Will be done. Therefore, it is considered that a loss occurs at the boundary portion when the drain water flows from the pump chamber to the discharge port inlet and is drained when the drainage pump is operated.

The purpose of this disclosure is to provide a drainage pump capable of improving drainage efficiency.

In order to solve the above problems, the drainage pump according to the present disclosure includes a motor, a housing having an upper opening and a suction port at the lower end and a discharge port at the side, and a rotary vane connected to the motor. , And a pump body having a through hole in the center and a cover attached to the upper end of the housing, the housing and the cover defining the pump chamber and the discharge port. A drainage pump provided with a discharge port inlet that opens into the pump chamber, wherein the pump chamber has a substantially cylindrical inner peripheral surface formed by joining the housing and the cover, and the discharge. The outlet inlet is open to the joint portion between the housing and the cover on the inner peripheral surface of the pump chamber, and the inner peripheral surface of the inner peripheral surface of the pump chamber formed by the housing and the discharge. The feature is that the corners located at the boundary with the inner surface of the exit are chamfered.

In this drainage pump, a step portion is formed at the joint portion of the housing so as to extend outward in the radial direction of the housing from the upper edge position of the inner peripheral surface and have a width in the radial direction of the housing. The upper part of the housing may be opened to the step portion with respect to the housing, and the chamfer width of the corner portion may be set to be equal to or less than the width of the step portion. Further, the inner peripheral surface formed by the cover and the corner portion located at the boundary with the inner surface of the discharge port may be chamfered. Further, in the corner portion, the chamfer width of the portion located on the upstream side of the flow of drainage from the pump chamber to the discharge port inlet may be larger than the chamfer width of the portion located on the downstream side.

According to the present disclosure, it is possible to provide a drainage pump capable of improving drainage efficiency.

It is a vertical sectional view which shows the drainage pump which concerns on embodiment of this disclosure. It is a perspective view which shows the housing. It is an enlarged perspective view which shows the housing side part of the discharge port inlet. FIG. 5 is a cross-sectional view showing a housing and a cover cut along a plane passing through the center line of a discharge port. (A) is an enlarged cross-sectional view showing a part A in FIG. (B) is an enlarged cross-sectional view showing a modified example with respect to FIG. 5 (A). It is a top view which shows the housing. It is an enlarged plan view which shows the part B in FIG. It is a top view corresponding to FIG. 7 which shows the modification 1 of the housing side part of a discharge port inlet. It is a top view corresponding to FIG. 7 which shows the modification 2 of the housing side part of a discharge port inlet. It is a perspective view corresponding to FIG. 3 which shows the modification 3 of the housing side part of a discharge port inlet. It is a perspective view corresponding to FIG. 3 which shows the modification 4 of the housing side part of a discharge port inlet.

Hereinafter, a mode for carrying out the present disclosure will be described based on the drawings. In FIG. 1, the drainage pump 10 according to the present embodiment has a motor 12 and a pump main body 20. The motor 12 is provided above the pump body 20. A motor case 30 that supports the motor 12 is provided between the motor 12 and the pump body 20. The pump body 20 is made of synthetic resin as an example, and includes a housing 40, a rotary vane 50, and a cover 32. By joining the housing 40 and the cover 32, a substantially cylindrical inner peripheral surface is provided. It constitutes a pump chamber 44 having 44A.

The housing 40 has an opening at the top and a suction port 42 at the lower end, and a discharge port 46 at the side. The suction port 42 is formed in a pipe shape having an opening 43 at the lower end. The discharge port 46 includes a discharge port inlet 48 that opens into the pump chamber 44, and projects laterally. The discharge port 46 is arranged on the radial side of the rotary shaft 50CL of the rotary blade 50, which will be described later. The axis 46CL of the discharge port 46 is arranged in the horizontal direction. Further, on the axis 46CL of the discharge port 46, a shaft portion 52 located at the center of the rotary blade 50, which will be described later, is located.

When the drainage pump 10 is used, a drain pipe (not shown) for draining the drain water discharged from the discharge port 46 to the outside of the pump body 20 to an external drainage facility or the like is attached to the discharge port 46. Be done. As shown in FIG. 2, the housing 40 is provided with, for example, a pair of claws 24 for fixing the motor case 30. The discharge port 46 is not limited to the one integrally molded with the housing 40, and may be formed separately from the housing 40 and assembled to the housing 40.

As shown in FIG. 1, the rotary vane 50 is connected to the motor 12 and housed in the pump chamber 44. The rotary blade 50 is made of synthetic resin as an example, and has a plurality of flat plate-shaped large plates extending from the shaft portion 52 and the outer peripheral portion of the shaft portion 52 in the radial direction (in other words, radially outside) of the rotary shaft 50CL. It has a diameter blade 60 and a plurality of flat plate-shaped small diameter blades 61 connected to the lower end edge of each large diameter blade 60 and inserted into the suction port 42. The large-diameter blades 60 are provided, for example, at equal angles in the circumferential direction. The lower end edge of each large-diameter blade 60 is formed in a tapered shape that inclines downward toward the inner diameter side. Each lower end edge is connected to a disk-shaped annular member 62 having a plurality of fan-shaped openings 58 in the center.

The large-diameter blade 60 is provided on the shaft portion 52 so that the large-diameter blade 60 of the rotary blade 50 is located in front of the discharge port 46, that is, on the axis 46CL of the discharge port 46. Further, the outer peripheral edge of the annular member 62 is located above the lower end of the inner surface 56 of the discharge port 46 and below the axis 46CL of the discharge port 46.

The shaft portion 52 penetrates the through hole 36 having the role of an air hole formed in the center of the cover 32 and projects toward the motor 12. The drive shaft of the motor 12 is inserted and fixed in the hole provided along the central shaft of the shaft portion 52. A gap is provided between the through hole 36 and the shaft portion 52.

A drainage disk 14 is attached to the upper surface of the shaft portion 52. The drainage disk 14 has a role of preventing the drained water from being directly scattered to the motor 12 even if the drained water is blown out from the through hole 36 of the cover 32.

The motor case 30 includes a tubular portion 22 that can be divided into upper and lower parts, and the motor 12 is housed in the upper portion of the tubular portion 22. Further, a vertically long slit-shaped drainage hole (in other words, an opening for drainage) (in other words, an opening for drainage) is formed on the side portion of the tubular portion 22.

As shown in FIG. 1, the cover 32 has a through hole 36 in the central portion and is attached to the upper end portion of the housing 40. Specifically, the cover 32 is integrally formed at the lower end of the tubular portion 22 of the motor case 30, for example. Further, the cover 32 is fitted into the housing 40 with the seal member 34 sandwiched between the cover 32 and the upper portion 19 of the housing 40. The cover 32 is fixed to the housing 40 by fitting the claw portion 24 (FIG. 2) to the motor case 30. In the pump body 20, the pump chamber 44 is defined by the housing 40 and the cover 32.

Below the suction port 42, a drain pan (not shown) for temporarily storing the drain water discharged from the air conditioner or the like is arranged.

As shown in FIG. 3, a step portion 18 is formed in a portion of the housing 40 to be joined to the cover 32. The step portion 18 extends radially outward of the housing 40 from the upper edge position of the inner peripheral surface 40A of the housing 40, and has a width W (FIG. 7) in the radial direction of the housing 40. As shown in FIG. 5, when the cover 32 is attached to the housing 40 (that is, when the housing 40 and the cover 32 are joined), the lower end 32B of the cover 32 abuts or faces the stepped portion 18. It has become. The inner peripheral surface 44A of the pump chamber 44 is composed of the inner peripheral surface 40A of the housing 40 and the inner peripheral surface 32A of the cover 32. The upper part of the housing 40 side portion forming a part of the discharge port inlet 48 is open to the step portion 18 with respect to the housing 40. As a result, when the housing 40 is viewed in a plan view, the step portion 18 is formed in an arc shape or a C shape that is discontinuous at the discharge port inlet 48 portion instead of a perfect circular ring shape. In a state where the housing 40 and the cover 32 are joined, the discharge port inlet 48 straddles the joint portion between the inner peripheral surface 40A formed by the housing 40 and the inner peripheral surface 32A formed by the cover 32, and the pump chamber 44 It is located so as to open to the inner peripheral surface 44A of the.

Further, the housing 40 side portion forming a part of the discharge port inlet 48 is formed in a substantially U shape. In other words, the inner surface 56 of the discharge port 46 near the discharge port inlet 48 is formed in a U-shaped cross section. Specifically, the inner surface 56 is composed of a pair of flat side surfaces 56A and, for example, an arc-shaped bottom surface 56B connecting the lower ends of the side surfaces 56A. The side surface 56A is formed parallel to the axial direction of the suction port 42. This is in consideration of pulling out the upper mold (not shown) upward in the axial direction of the suction port 42 when molding the inner surface 56 of the portion of the discharge port inlet 48. The axis of the suction port 42 corresponds to the rotating shaft 50CL (FIG. 1) of the rotating blade 50, which will be described later. The discharge port 46 may change to a circular cross section on the downstream side of the discharge port inlet 48. Further, the cross-sectional area on the downstream side of the discharge port 46 may be larger than the cross-sectional area of the discharge port inlet 48.

As shown in FIGS. 2 to 6, the corner portion 16 of the housing 40 side portion of the discharge port inlet 48 is chamfered. The corner portion 16 is a portion of the discharge port inlet 48 located at the boundary between the inner peripheral surface 40A of the housing 40 and the inner surface 56 of the discharge port 46. The chamfer of the corner portion 16 is, for example, a so-called R surface having an arc-shaped cross section. In addition, in this specification, "chamfering" refers to the case where a chamfering process such as cutting or plastic working is performed on a protruding corner having a corner to form an R surface or a C surface on the protruding corner, as well as casting. This also includes the case where a protruding corner having the shape of an R surface or a C surface is formed from a plastic material by injection molding or the like. Even in the latter case, which is not actually chamfered, expressions such as "chamfered corners" and "chamfered corners" may be used for convenience of explanation.

In the example shown in FIG. 5A, the corner portion 54 at the lower end of the cover 32 constituting the cover 32 side portion of the discharge port inlet 48 is not chamfered, but in order to further improve the drainage efficiency, FIG. As shown in B), the corner portion 54 may be chamfered in the same manner as the corner portion 16 of the housing 40 side portion of the discharge port inlet 48. As a result, the corner portion 54 located at the boundary between the inner peripheral surface 32A formed by the cover 32 and the inner surface 56 of the discharge port 46 is also chamfered. Although not shown, a protruding portion is provided on a part of the cover 32 so as to enter the upper part of the housing 40 side portion of the discharge port inlet 48 from the step portion 18, and the protruding portion is line-symmetrical with the bottom surface 56B of the discharge port 56. It is also possible to make the shape of the discharge port inlet 48 circular by providing the arcuate ceiling surface. Further, the corner portion of the protruding portion may be chamfered. As described above, the

corner portions

16 and 54 are formed so as to straddle the housing 40 and the cover 32, whereby at least a part of the

corner portions

16 and 54 is chamfered.

As shown in FIGS. 6 and 7, the chamfer width (radius of curvature) R of the corner portion 16 is set to be equal to or less than the width W of the step portion 18. The minimum value of the chamfer width R is, for example, 0.2 mm. In the illustrated example, the chamfer width R is smaller than the width W, but the chamfer width R may be the same as the width W. Further, the chamfer width R of the corner portion 16 in the plan view of the housing 40 is set equally on both sides of the discharge port inlet 48.

In order to further improve the drainage efficiency, as in the modified example 1 shown in FIG. 8, the portion of the corner portion 16 located on the upstream side of the drain water flow F from the pump chamber 44 to the discharge port inlet 48. The chamfer width R1 may be larger than the chamfer width R2 of the portion located on the downstream side. In this case, since the chamfer width R1 of the portion located on the upstream side of the flow F of the drain water is relatively large, the drain water easily flows into the discharge port inlet 48 smoothly. Further, since the chamfer width R2 of the portion located on the downstream side of the flow F of the drain water is relatively small, it is suppressed that the drain water passes through the discharge port inlet 48 and goes around the pump chamber 44 again. Further, as in the modified example 2 shown in FIG. 9, the chamfering of the corner portion 16 is not limited to the R surface having an arc-shaped cross section, and may be a so-called C surface having a flat cross section.

Further, the housing 40 side portion of the discharge port inlet 48 is not limited to a substantially U shape, and may be a substantially quadrangular shape as in the modified example 3 shown in FIG. In this case, the discharge port 46 having a circular cross section opens in a substantially quadrangular shape at the discharge port inlet 48. Further, of the four sides of the discharge port inlet 48, the corners 16 of the three sides of the housing 40 side portion excluding one side on the extension of the step portion 18 are chamfered. In a configuration in which the upper mold (not shown) is pulled out above the axis of the suction port 42 (in other words, the direction of the rotation shaft 50CL of the rotary blade 50 described later), the housing 40 side of the discharge port inlet 48 having such a shape. It is possible to mold the part. Further, instead of the modification 3 of FIG. 10, as in the modification 4 shown in FIG. 11, the discharge port 46 has a circular cross section, and the lower half circle portion of the discharge port inlet 48 is chamfered. You may. As a result, the continuity between the discharge port 46 and the discharge port inlet 48 is increased, and the drain water can be drained more efficiently.

(Action)
This embodiment is configured as described above, and its operation will be described below. In FIG. 1, the drainage pump 10 according to the present embodiment is appropriately installed so that the lower end of the suction port 42 is below the surface of the drain water collected in the drain pan (not shown). Then, when the motor 12 is driven to rotate the rotary blade 50 at high speed, the drain water collected in the drain pan 80 is sucked up from the suction port 42 and discharged from the discharge port 46 via the pump chamber 44. The drain water discharged from the discharge port 46 is discharged to an external drainage facility or the like via a drain pipe (not shown). The water stream containing air bubbles generated from the drain water, which is agitated by the rotation of the rotary blade 50, obtains centrifugal force in the pump chamber 44 and smoothly flows to the discharge port 46, and is discharged to the outside through the drain pipe.

In the present embodiment, as shown in FIG. 7, the corner portion 16 located at the boundary between the inner peripheral surface 40A of the housing 40 in which the housing 40 side portion of the discharge port inlet 48 opens and the inner surface 56 of the discharge port 46 is chamfered. Therefore, as compared with the case where the corner portion 16 is not chamfered, the flow of the drain water is less likely to be disturbed, and the drain water smoothly flows from the pump chamber 44 to the discharge port inlet 48. Therefore, the drainage efficiency of the drainage pump 10 can be improved.

In the modified example 1 shown in FIG. 8, the chamfer width R1 of the portion located on the upstream side (that is, the rear side in the rotation direction of the rotary blade 50) of the drain water flow F in the pump chamber 44 is on the downstream side (that is, that is). Since it is larger than the chamfer width R2 of the portion located on the front side in the rotation direction of the rotary blade 50, the drain water easily flows into the discharge port inlet 48 smoothly. Further, since the chamfer width R2 of the portion located on the downstream side of the flow F of the drain water is smaller than the chamfer width R1 of the portion located on the upstream side, the drain water is easily captured by the corner portion 16 on the downstream side. Therefore, the loss that the drain water passes through the discharge port inlet 48 and repeatedly circulates in the pump chamber 44 is reduced.

In the modified example 2 shown in FIG. 9, the chamfer of the corner portion 16 is the C surface, but even if the corner portion 16 is such a C surface, the drain water is compared with the case where the corner portion 16 is not chamfered. Can smoothly flow from the pump chamber 44 into the discharge port inlet 48. Further, in the modified example 3 shown in FIG. 10, while the discharge port 46 has a circular cross section, the housing 40 side portion of the discharge port inlet 48 is formed in a substantially U shape, and the corner portion 16 thereof is chamfered. Therefore, even if the discharge port 46 has a circular cross section, the drain water can be efficiently drained via the discharge port inlet 48 whose corners 16 are chamfered.

Further, in the modified example 4 shown in FIG. 11, the discharge port 46 has a circular cross section, and the lower half circular portion of the discharge port inlet 48 is chamfered. Since the shape continuity between the discharge port 46 and the discharge port inlet 48 is increased, drain water can be drained more efficiently.

[Other Embodiments]
Although an example of the embodiment of the present disclosure has been described above, the embodiment of the present disclosure is not limited to the above, and can be variously modified and implemented without departing from the gist thereof. Of course there is.

In the above embodiment, on the upper edge of the inner peripheral surface 40A of the housing 40, a step portion 18 extending radially outward from the position of the inner peripheral surface 40A and having a width in the radial direction is formed, and a discharge port inlet 48 is formed. However, the portion of the opening above the discharge port inlet 48 is not limited to such a step portion 18. If it is possible to form a chamfer at the corner 16 of the discharge port inlet 48 in consideration of die-cutting property, the upper part of the discharge port inlet 48 may be opened to another portion.

Further, the range in which the chamfer is formed in the corner portion 16 is not limited to the entire corner portion 16. The chamfer may be formed on a part of the corner portion 16.

The disclosure of Japanese Patent Application No. 2020-47039 filed on March 17, 2020 is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards described herein are to the same extent as if the individual documents, patent applications, and technical standards were specifically and individually stated to be incorporated by reference. Incorporated herein by reference.

Claims

A motor, a housing with an upper opening and a suction port at the lower end and a discharge port at the side, a rotary vane connected to the motor, and a through hole in the center and the upper end of the housing. A drainage pump having a pump body with a cover attached to the portion, the housing and the cover defining a pump chamber, and the discharge port having a discharge port inlet that opens into the pump chamber. There,
The pump chamber has a substantially cylindrical inner peripheral surface formed by joining the housing and the cover.
The discharge port inlet is open to the inner peripheral surface of the pump chamber so as to straddle the inner peripheral surface formed by the housing and the inner peripheral surface formed by the cover.
A drainage pump whose corners located at the boundary between the inner peripheral surface of the housing and the inner surface of the discharge port of the discharge port inlet are chamfered.
At the portion of the housing to be joined to the cover, a step portion extending radially outward from the upper edge position of the inner peripheral surface and having a width in the radial direction of the housing is formed.
The upper part of the housing side portion forming a part of the discharge port inlet is opened to the step portion with respect to the housing.
The drainage pump according to claim 1, wherein the chamfer width of the corner portion is set to be equal to or less than the width of the step portion.
The drainage pump according to claim 1 or 2, wherein the corner portion of the discharge port inlet located at the boundary between the inner peripheral surface of the cover and the inner surface of the discharge port is chamfered.
Claims 1 to 3 in which the chamfer width of a portion of the corner portion located on the upstream side of the flow of drainage from the pump chamber to the discharge port inlet is larger than the chamfer width of the portion located on the downstream side. The drainage pump according to any one item.