JP6754333B2 - Drainage pump - Google Patents

Description

The present invention relates to a drainage pump.

Air-conditioning equipment is provided with a drainage pump that discharges water or the like accumulated in the drain pan to the outside. The drainage pump includes, for example, as shown in Patent Documents 1 to 3, a lower housing (referred to as a pump body in Patent Document 1) having a suction pipe forming a suction port at the lower end of a central portion, and a lower. A rotor (referred to as a rotary vane in Patent Document 1) rotatably arranged in the rotor housing chamber of the housing, a receiving member forming the rotor housing chamber together with the inner peripheral portion of the lower housing, and an upper portion of the receiving member. The drive motor, which is arranged in the main body support portion of the above and drives the rotor, and the cover that holds the drive motor in cooperation with the receiving member are included as main elements.

In Patent Document 1, the receiving member and the lower housing are connected to each other by a snap-fit type connecting means between the convex portion of the lid of the receiving member and the mounting legs of the lower housing. Further, the upper part of the receiving member and the cover are connected to the attachment of the cover and the main body support portion of the upper part of the receiving member by a snap-fit type connecting means.

Japanese Patent No. 59999942 Japanese Patent No. 5934515 Japanese Patent No. 6078307

The gap between the inner circumference of the lower housing and the outer circumference of the rotor, which forms the rotor housing chamber of the lower housing, is set to suppress the sound pressure level of the water scraping sound of the drainage pump over the entire circumference of the rotor. It is required to be maintained at the value. That is, the cover, the receiving member, and the lower housing are assembled to each other so that the center of rotation of the rotor connected to the output shaft of the drive motor and the center axis of the rotor accommodating chamber of the lower housing are on a common center axis. It is required that the rotor be placed in the rotor housing chamber of the lower housing.

However, the rotation center and lower of the rotor are caused by a manufacturing error of the end portion of the lower housing connected to the lower end of the lid member of the receiving member, and an assembly error of the convex portion of the lid member and the mounting leg of the lower housing. The central axis of the rotor housing chamber of the housing may not be on the common central axis, and the gap between the inner peripheral portion of the lower housing and the outer peripheral portion of the rotor may be biased and may not be uniform over the entire circumference of the rotor. In such a case, complicated adjustment work of the rotor axis is required so that the center of rotation of the rotor and the center axis of the rotor accommodating chamber of the lower housing are on the common center axis.

Further, from the viewpoint of improving the production efficiency of the drainage pump, it is also required to shorten the assembly work time of the drainage pump.

In consideration of the above problems, the present invention is a drainage pump provided with a lower housing having a rotor accommodating chamber for accommodating the rotor, and the center of rotation of the rotor and the central axis of the rotor accommodating chamber of the lower housing are common. An object of the present invention is to provide a drainage pump in which the rotor can be arranged in the rotor accommodating chamber so as to be surely on the central axis, and the assembly man-hours can be reduced.

In order to achieve the above object, the drainage pump according to the present invention has a lower housing having a rotor accommodating chamber communicating with a suction port and a discharge port concentrically with an inner peripheral portion of an opening end, and a rotor accommodating in the lower housing. A pump rotor rotatably arranged in a room, a drive motor having an output shaft connected to the pump rotor to drive the pump rotor, and a motor cover member for holding the upper outer periphery of the drive motor are provided. The inner circumference of the upper opening end of the lower housing holds the lower outer circumference of the drive motor, and the motor cover member and the lower housing are detachably connected by a connecting means , and the lower housing forms a part of the rotor housing chamber. It is characterized in that a partition member having a lid portion is housed inside .

Further, specification Setsu member, a pair of motor receiving portion for receiving the driving motor held in the motor cover member or may have integrally with the lid.

Further, the connecting means may be composed of a pair of hook stoppers formed on the outer peripheral portion of the lower housing and a pair of hook portions of the motor cover member that are elastically displaced with respect to the pair of hook stoppers. ..

According to the drainage pump according to the present invention, the inner circumference of the upper opening end of the lower housing having the rotor accommodating chamber communicating with the suction port and the discharge port concentrically with the inner peripheral portion of the opening end is the lower portion of the drive motor. Since the outer circumference is held and the motor cover member and the lower housing are detachably connected by the connecting means, the rotation center of the rotor and the central axis of the rotor accommodating chamber of the lower housing are surely on the common central axis. The rotor can be arranged in the rotor accommodation chamber, and the assembly man-hours can be reduced.

It is a perspective view which shows the appearance of the 1st Example of the drainage pump which concerns on this invention. It is an exploded perspective view which shows the structure of the drainage pump shown in FIG. 1 by disassembling. It is a top view of the drainage pump shown in FIG. It is sectional drawing which is shown along the IV-IV line in FIG. It is sectional drawing which is shown along the VV line in FIG. It is sectional drawing which shows the structure of 2nd Example of the drainage pump which concerns on this invention. It is a perspective view which shows the appearance of the partition member used in the example shown in FIG. It is a top view of the partition member shown in FIG. It is a front view of the partition member shown in FIG. 7.

FIG. 1 is a schematic view of the appearance of a first embodiment of the drainage pump according to the present invention, FIG. 2 is an exploded perspective view of the first embodiment, FIG. 3 is a top view of the first embodiment, and FIG. A cross-sectional view shown along the IV-IV line in FIG. 3, FIG. 5 shows a cross-sectional view shown along the VV line in FIG. The concept of "up and down" in the following description corresponds to the top and bottom in the drawing of FIG.

As shown in FIG. 1, the drainage pump 10 is made of a resin lower housing 20 having a suction pipe 20E forming a suction port 20a at the lower end of the central portion, and a resin lower housing 20 rotatably arranged in the lower housing 20. The pump rotor 22 and the resin partition member 24 that forms the rotor housing chamber 20A together with the inner peripheral portion of the lower housing 20, the drive motor 25 that drives the pump rotor 22, and the resin that covers the drive motor 25. It is configured to include a motor cover member 26 as a main element.

One end of the suction pipe 20E forming the lower portion of the cylindrical lower housing 20 is arranged, for example, in a drain pan (not shown) for collecting the liquid that has fallen from the evaporator in the air conditioner. As shown in FIGS. 4 and 5, the inner peripheral portion of the lower portion of the lower housing 20 is formed so as to spread like a funnel around the suction port 20a. Further, in the discharge pipe 20J on the lower side wall of the lower housing 20, the discharge port 20b extends along the direction orthogonal to the central axis of the suction port 20a described above. An elbow joint 30 is connected to the discharge pipe 20J. One end 30P of the elbow joint 30 has a notch 30K engaged with a stopper 20JK provided on the discharge pipe 20J. One end 30P has a passage inside which communicates with the discharge port 30C. A groove 30G in which the C-shaped retaining ring 32 is locked is formed on the outer peripheral edge of the one end 30P except for the notch 30K. Further, as shown in FIG. 5, the discharge pipe 20J has a connection end portion 20JE that is fitted into the opening of one end 30P of the elbow joint 30. An O-ring 34 is attached to the outer peripheral portion of the connection end portion 20JE. The O-ring 34 is intended to seal the gap between the outer peripheral portion of the connection end portion 20JE and the peripheral edge of the opening at one end 30P. A groove 20JG in which the C-shaped retaining ring 32 is locked is also formed at a position adjacent to the stopper 20JK along the central axis direction of the discharge pipe 20J. Further, notches 20R are formed at positions adjacent to both ends of the stopper 20JK along the circumferential direction of the discharge pipe 20J, at which a part of the outer peripheral edge of the one end 30P is engaged. As a result, the stopper 20JK in the discharge pipe 20J is engaged with the notch 30K at one end 30P of the elbow joint 30, and the connection end 20JE is fitted into the opening at one end 30P with the O-ring 34. The mold retaining ring 32 is locked in the groove 20JG of the discharge pipe 20J and the groove 30G of the elbow joint 30. Therefore, as shown in FIG. 1, one end 30P of the elbow joint 30 is connected to the discharge pipe 20J. As shown in FIGS. 2 and 5, a rectangular return water discharge port 20EX is formed on the side wall of the lower housing 20 at a position facing the discharge pipe 20J.

On the outer peripheral portion of the upper end portion of the side wall of the lower housing 20, hook stopper portions 20LA and 20LB as locked portions forming a part of the detachable connecting means are shown in FIGS. 1, 2 and 4, respectively. As shown, they are integrally formed facing each other. The hook stop portions 20LA and 20LB are formed on a straight line passing through the central axis C of the lower housing 20 and substantially orthogonal to the central axis of the discharge pipe 20J described above.

Flat surfaces 24wa and 24wa of the guide walls 24WA and 24WB of the partition member 24, which will be described later, are engaged with the portions corresponding to the positions of the hook stoppers 20LA and 20LB on the inner peripheral portion of the side wall of the lower housing 20, respectively. A surface 20D is formed.

As shown in FIGS. 2 and 4, an annular groove 20G into which the O-ring 28 is inserted is formed at the lower end portion of the inner peripheral portion of the side wall of the lower housing 20. As a result, the lid portion 24B of the partition member 24, which will be described later, is in contact with the peripheral edge of the open end of the inner peripheral portion of the lower housing 20 via the O-ring 28.

As shown in FIGS. 2 and 5, for example, the partition member 24 is formed of a resin material and has a pair of motor receiving portions 24RA and 24RB and a pair of motor receiving portions 24RA and 24RB that receive the drive motor 25 from below. The lid portion 24B, which is formed integrally with the lower housing 20 and partitions the open end of the inner peripheral portion of the lower housing 20, is included as a main element. The disc-shaped lid portion 24B has a pair of guide walls 24WA and 24WB at predetermined intervals. A flow path through which the fluid discharged to the outside passes through the return water discharge port 20EX is formed between the pair of guide walls 24WA and 24WB. The guide walls 24WA and 24WB each extend along the circumferential direction of the lid portion 24B with a predetermined inscribed angle. The guide walls 24WA and 24WB each have a flat surface 24wa and a flat surface 24wa that are engaged with the flat surface 20D at the inner peripheral portion of the side wall of the lower housing 20 described above. As a result, the entire partition member 24 arranged in the inner peripheral portion of the lower housing 20 is positioned so that the return water discharge port 20EX and the flow path between the pair of guide walls 24WA and 24WB face each other. .. The positioning means for the inner peripheral portion of the lower housing 20 of the partition member 24 is not limited to such an example, and for example, instead of the flat surface 20D, the flat surface 24wa, and 24wb, a small protrusion and a small protrusion and It may be configured so that a corresponding shallow groove is formed.

Further, the output shaft 25S of the drive motor 25 and the hub member 22S of the pump rotor 22, which will be described later, are inserted between the pair of guide walls 24WA and 24WB, and between the pair of motor receiving portions 24RA and 24RB. The cylindrical portion 24C to be formed is integrally formed with the lid portion 24B. The cylindrical portion 24C has a hole 24a in the upper wall through which the output shaft 25S of the drive motor 25 is passed. An opening 24b is formed in a part of the side portion of the cylindrical portion 24C facing the motor receiving portions 24RA and 24RB. As a result, the space formed between the motor receiving portions 24RA and 24RB and the rotor accommodating chamber 20A communicate with each other through the opening 24b.

The motor receiving portions 24RA and 24RB are separated from each other in the radial direction of the disc-shaped lid portion 24B at a predetermined interval, and extend at a predetermined circumferential angle along the circumferential direction of the disc-shaped lid portion 24B. .. The motor receiving portions 24RA and 24RB are formed so as to cross the flow path between the pair of guide walls 24WA and 24WB described above. Further, the motor receiving portions 24RA and 24RB extend upward along the central axis higher than the heights of the guide walls 24WA and 24WB of the lid portion 24B. The positions of the upper ends of the motor receiving portions 24RA and 24RB (height from the surface of the lid portion 24B) are such that the lid portion 24B of the partition member 24 is the inner circumference of the lower housing 20 as shown in FIGS. 4 and 5, for example. When arranged at the open end of the portion, a part of the outer peripheral portion of the received drive motor 25 is set to be positioned at the upper portion of the inner peripheral portion of the lower housing 20. Further, the motor receiving portions 24RA and 24RB also have a function as a muffling guide wall. Therefore, the rotor accommodating chamber 20A is formed by being surrounded by the inner peripheral portion of the lower housing 20 and the lid portion 24B of the partition member 24.

The drive motor 25 is, for example, a flat DC brushless motor. The drive motor 25 is received by the upper end portions of the motor receiving portions 24RA and 24RB of the partition member 24, and is covered and held by the motor cover member 26. As shown in FIGS. 3 and 5, the connector portion 25C of the drive motor 25 goes over the uppermost end of the lower housing 20 and projects outward through a notch (not shown) of the motor cover member 26. .. The rotation speed of the output shaft 25S of the drive motor 25 is maintained at a predetermined maximum rotation speed. The rotation speed of the output shaft 25S of the drive motor 25 may be controlled by the control unit according to the discharge flow rate. The drive motor 25 is not limited to such an example, and may be an AC motor. The drive motor 25 may be, for example, a kumadori motor with an encoder.

The motor cover member 26 is made of, for example, a resin material. As shown in FIG. 3, hook portions 26NA and 26NB that are detachably locked to the hook stopper portions 20LA and 20LB are integrally formed on the outer peripheral portion of the motor cover member 26 so as to face each other. The hook portions 26NA and 26NB are elastically displaceable and have claw portions 26na and 26nb that are locked to the tips of the hook stoppers 20LA and 20LB, respectively. As a result, the claw portions 26na and 26nb of the hook portions 26NA and 26NB are pressed against the hook stopper portions 20LA and 20LB, and the claw portions 26na and 26nb are elastic in the direction of separating from each other against the elastic force of the hook portions 26NA and 26NB. After being displaced, the claws 26na and 26nb are locked to the hooking portions 20LA and 20LB, while the hooking portions 26na and 26nb are pulled apart from the hooking portions 20LA and 20LB. The 26NA and 26NB are unlocked with respect to the tips of the hook stoppers 20LA and 20LB. The motor cover member 26 has a motor accommodating portion for accommodating a part of the drive motor 25 inside. Bracket portions 26BK1, 26BK2, and 26BK3 are integrally formed at, for example, three places on the upper surface portion of the motor cover member 26. The bracket portions 26BK1, 26BK2, and 26BK3 each have a hole 26a into which a mounting screw is inserted. As a result, the output shaft 25S of the drive motor 25 housed in the motor housing portion of the motor cover member 26 is positioned at the upper inner peripheral portion where the lower portion of the drive motor 25 is close to the opening end of the inner peripheral portion of the lower housing 20. Therefore, it is substantially coaxial with the central axis C of the lower housing 20.

The number of bracket portions 26BK1, 26BK2, and 26BK3 is not limited to these examples, and may be, for example, two or less, or four or more.

The pump rotor 22 is inserted into, for example, a plurality of rotary blades 22B1 and 22B2 (i = 1 to 4), which are integrally formed of a resin material and constitute a stirring body that applies centrifugal force to a fluid, and into a suction port 20a. A truncated cone-shaped support plate 22T having a shaft portion 22B at the lower end and integrally formed with the lower ends of the rotary blades 22B1 and 22B2, and an annular side wall 22W formed integrally with the support plate 22T. It is configured.

The support plate 22T has a shaft portion 22B at the lower end. The shaft portion 22B has four protrusions as winglets forming a cross section extending along the central axis.

A hub member 22S connected to the periphery of the through hole 22a in the central portion of the support plate 22T is formed in the through hole 22a. The output shaft 25S of the drive motor 25 is connected to the hub member 22S. The hub member 22S is integrally formed on the central axis common to the central axis of the shaft portion 22B, and projects so as to penetrate the above-mentioned through hole 22a. That is, the hub member 22S is formed substantially perpendicular to the support surface of the support plate 22T.

The rotary blades 22B1 and 22B2 as the stirring pieces are formed of, for example, a resin material in a radial pattern integrally with the support plate 22T. The rotary blades 22B2 are formed at predetermined intervals between the adjacent rotary blades 22B1. The length of the rotary blade 22B1 along the radial direction of the pump rotor 22 is set to be larger than the corresponding length of the rotary blade 22B2.

In the pump rotor 22, instead of the rotary blades 22B1 and 22B2, for example, a plurality of skewer-shaped protrusions as stirring pieces are formed vertically and horizontally at predetermined intervals around the through holes 22a of the support plate 22T. It may be configured as follows.

In such a configuration, when the drive motor 25 is in the operating state, for example, the centrifugal force of the pump rotor 22 that is rotated clockwise causes suction from the suction port 20a along the direction indicated by the arrow in FIG. The fluid is guided into the space formed by the inner peripheral portion of the lower housing 20 and the lower end portion of the partition member 24, that is, into the rotor accommodating chamber 20A through the through hole of the pump rotor 22, and the discharge pipe 20J and the elbow. It is discharged to the outside along the direction indicated by the arrow through the discharge port 30C of the joint 30. At that time, the lower housing 20 and the motor cover member 26 are connected to each other by the hook portions 26NA and 26NB and the hook stopper portions 20LA and 20LB, and the center axis of the output shaft 25S of the drive motor 25 and the center of the lower housing 20. The pump rotor 22 is arranged in the rotor accommodation chamber 20A so that the axis C is on a common straight line, that is, concentrically. This improves the assembly dimensional accuracy of the drainage pump. Further, the lower portion of the outer peripheral portion of the drive motor 25 is positioned by the inner peripheral portion of the upper opening end portion of the lower housing 20, so that the central axis of the output shaft 25S of the drive motor 25 and the central axis C of the lower housing 20 Since the pump rotor 22 is arranged so as to be on a common straight line, the pump rotor 22 can rotate stably in the rotor accommodating chamber 20A, and factors leading to the generation of abnormal noise can be suppressed.

In assembling the drainage pump 10, for example, first, the motor cover member 26 is attached to the drive motor 25, and then the lower end surface of the drive motor 25 is the end of the motor receiving portion 24RA and 24RB of the partition member 24. The output shaft 25S of the drive motor 25 is inserted into the hole 24a of the cylindrical portion 24C of the partition member 24 until it comes into contact with the portion. Subsequently, after the pump rotor 22 is adhered to the tip of the output shaft 25S of the drive motor 25, the O-ring 28 is mounted in the groove 20G of the lower housing 20 to which the elbow joint 30 is connected. Then, the hook stoppers 20LA and 20LB of the lower housing 20 with the elbow joint 30 are pressed against the hooks 26NA and 26NB of the motor cover member 26 with the drive motor 25, the pump rotor 22 and the partition member 24. motor cover member 26, the assembly of the drainage pump 10 is completed because it is coupled to the lower housing 20. Thus, the hooking portion 20LA and 20LB, by connecting means consisting of a hook portion 26NA and 26Nb, motor cover member 26, by being connected to the lower housing 20, a conventional Because assembly of the drainage pump 10 is completed drainage The assembly work time of the drainage pump can be shortened compared to the pump.

FIG. 6 is a schematic view of the configuration of the second embodiment of the drainage pump according to the present invention, FIG. 7 is a perspective view showing the appearance of the partition member of the second embodiment, and FIG. 8 is the partition member shown in FIG. The plan view of is shown. The concept of "up and down" in the following description corresponds to the top and bottom in the drawing of FIG.

As shown in FIG. 6, the drainage pump is made of a resin lower housing 40 having a suction pipe 40E forming a suction port 40a at the lower end of the central portion, and a resin lower housing 40 rotatably arranged in the lower housing 40. The pump rotor 22, the resin partition member 44 that forms the rotor accommodating chamber 40A together with the inner peripheral portion of the lower housing 40, the drive motor 25 that drives the pump rotor 22, and the resin motor that covers the drive motor 25. It is configured to include a cover member 26 as a main element. In FIG. 6, the same components as those in the example shown in FIG. 1 are shown with the same reference numerals, and the duplicate description thereof will be omitted.

One end of the suction pipe 40E forming the lower portion of the cylindrical lower housing 40 is arranged, for example, in a drain pan (not shown) for collecting the liquid that has fallen from the evaporator in the air conditioner. As shown in FIG. 6, the inner peripheral portion of the lower portion of the lower housing 40 is formed so as to spread like a funnel around the suction port 40a. Further, in the discharge pipe 40J on the lower side wall of the lower housing 40, the discharge port 40b extends along the direction orthogonal to the central axis of the suction port 40a described above. An elbow joint 30 is connected to the discharge pipe 40J. Further, the discharge pipe 40J has a connection end portion 40JE that is fitted into an opening at one end of the elbow joint 30. An O-ring 34 is attached to the outer peripheral portion of the connection end portion 40JE. As a result, a rectangular return water discharge port 40EX is formed on the side wall of the lower housing 40 at a position facing the discharge pipe 40J.

A pair of hook stop portions (not shown) as locked portions forming a part of the detachable connecting means are integrally formed on the outer peripheral portion of the upper end portion of the side wall of the lower housing 40 so as to face each other. .. The configuration of the hook stopper portion has the same configuration as the configuration of the hook stopper portions 20LA and 20LB in the example shown in FIG.

At the lower end of the inner peripheral portion of the side wall of the lower housing 40, a step portion is formed in which the O-ring support portion 44F of the partition member 44 described later is fitted. The O-ring support 44F of the partition member 44 has an annular groove 44G into which the O-ring 28 is inserted, as shown enlarged in FIG. As a result, the lid portion 44B and the O-ring support portion 44F of the partition member 44, which will be described later, are in contact with the peripheral edge of the open end of the inner peripheral portion of the lower housing 40 and the stepped portion.

As shown in FIG. 7, the partition member 44 is integrally formed with a pair of motor receiving portions 44RA and 44RB and a pair of motor receiving portions 44RA and 44RB, which are formed of a resin material and receive the drive motor 25 from below. The lid portion 44B formed to partition the open end of the inner peripheral portion of the lower housing 40 and the O-ring support portion 44F formed integrally with the outer peripheral edge of the lid portion 44B to support the O-ring 28 are included as main elements. It is configured. An annular O-ring support portion 44F is integrally formed on the outer peripheral edge portion of the lid portion 44B. The lid 44B has a cylindrical portion 44C in the center, as shown in FIGS. 8 and 9. The cylindrical portion 44C formed integrally with the lid portion 44B has a hole 44a in the upper wall through which the output shaft 25S of the drive motor 25 passes. The hub member 22S of the pump rotor 22 connected to the output shaft 25S of the drive motor 25 is inserted into the space inside the cylindrical portion 44C.

The lid portion 44B has a pair of motor receiving portions 44RA and 44RB adjacent to the cylindrical portion 44C. An opening 44b is formed in a part of the motor receiving portion 44RA and a part of the side portion facing the 44RB in the cylindrical portion 44C. As a result, the space formed between the motor receiving portions 44RA and 44RB and the rotor accommodating chamber 40A communicate with each other through the through hole 44d of the opening 44b and the lid portion 44B.

The motor receiving portions 44RA and 44RB are separated from each other in the radial direction of the lid portion 44B at a predetermined interval, and extend at a predetermined circumferential angle along the circumferential direction of the lid portion 44B. Further, the motor receiving portions 44RA and 44RB extend upward along the central axis higher than the height of the O-ring supporting portion 44F of the lid portion 44B. The positions of the upper ends of the motor receiving portions 44RA and 44RB (height from the surface of the lid portion 44B) are such that, for example, as shown in FIG. 6, the lid portion 44B of the partition member 44 opens the inner peripheral portion of the lower housing 40. When arranged at the end, a part of the outer peripheral portion of the received drive motor 25 is set to be positioned at the upper part of the inner peripheral portion of the lower housing 40. Further, the motor receiving portions 44RA and 44RB also have a function as a muffling guide wall. Therefore, the rotor accommodating chamber 40A is formed by being surrounded by the inner peripheral portion of the lower portion of the lower housing 40 and the lid portion 44B of the partition member 44.

In such a configuration, when the drive motor 25 is in the operating state, for example, the centrifugal force of the pump rotor 22 that is rotated clockwise causes suction from the suction port 40a along the direction indicated by the arrow in FIG. The fluid is guided into the space formed by the inner peripheral portion of the lower housing 40 and the lower end portion of the partition member 44, that is, into the rotor accommodating chamber 40A through the through hole of the pump rotor 22, and the discharge pipe 40J and the elbow. It is discharged to the outside along the direction indicated by the arrow through the discharge port 30C of the joint 30. At that time, the lower housing 40 and the motor cover member 26 are connected to each other by the hook portions 26NA and 26NB and the hook stopper portion (not shown), and the central axis of the output shaft 25S of the drive motor 25 and the lower housing 40. The pump rotor 22 is arranged in the rotor accommodating chamber 40A so that the central axis C of the pump rotor 22 is substantially coaxial with the center axis C of the pump rotor 22. This improves the assembly dimensional accuracy of the drainage pump. Further, since the central axis of the output shaft 25S of the drive motor 25 and the central axis C of the lower housing 40 are arranged on a common straight line, the pump rotor 22 rotates stably in the rotor accommodating chamber 40A. , Factors leading to the generation of abnormal noise can be suppressed. In addition, since the lid 44B of the partition member 44 has the O-ring support 44F, the position of the lid 44B along the central axis C in the lower housing 40 is the lid 24B of the partition member 24 in the example shown in FIG. The volume of the rotor accommodating chamber 40A is larger than the volume of the rotor accommodating chamber 20A by being set in a direction farther away from the rotor accommodating chamber 40A than the corresponding position of the pump rotor 22. It is also possible to provide a large pump rotor.

In the first and second embodiments of the drainage pump according to the present invention described above, the discharge pipe of the lower housing is configured to be connected to the elbow joint, but is limited to such an example. Instead, for example, the discharge pipe of the lower housing may be configured to be connected to a straight joint. Further, in the first embodiment and the second embodiment of the drainage pump, a hook portion and a hook stopper portion are used as the connecting means, but the present invention is not limited to these examples, and for example, the motor cover member and the lower housing may be used. , Each of which has a plurality of flange portions having mounting holes, may be configured so that the motor cover member and the lower housing are connected to each other by connecting screws. Further, although the first embodiment and the second embodiment of the drainage pump according to the present invention are applied in the air conditioner, the present invention is not limited to these examples, and may be applied to other devices as well. Of course.

10 Drainage pump 20, 40 Lower housing 20LA, 20LB Hook stop 22 Pump rotor 24, 44 Partition member 25 Drive motor 26 Motor cover member 26NA, 26NB Hook section

Claims (3)

A lower housing having a rotor accommodating chamber communicating with the suction port and the discharge port concentrically with the inner peripheral portion of the opening end.
A pump rotor rotatably arranged in the rotor housing chamber of the lower housing,
A drive motor having an output shaft connected to the pump rotor and driving the pump rotor,
A motor cover member for holding the upper outer circumference of the drive motor is provided.
The inner circumference of the upper opening end of the lower housing holds the lower outer circumference of the drive motor, and the motor cover member and the lower housing are detachably connected by a connecting means .
The lower housing is a drainage pump for accommodating a partition member having a lid portion forming a part of the rotor accommodating chamber inside . The drainage pump according to claim 1 , wherein the partition member has a pair of motor receiving portions that receive the driving motor held by the motor cover member integrally with the lid portion . The connecting means is composed of a pair of hook stoppers formed on the outer peripheral portion of the lower housing and a pair of hook portions of the motor cover member that are elastically displaced with respect to the pair of hook stoppers. The drainage pump according to claim 1, wherein the drainage pump is characterized in that.

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