JP4462843B2 - Drainage pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage pump, and more particularly to a drainage pump equipped in an air conditioner.
[0002]
[Prior art]
In the indoor unit of the air conditioner, moisture in the air condenses and adheres to the heat exchanger during the cooling operation, and drops into a drain pan provided below the heat exchanger. A drainage pump is used to drain the drain water accumulated in the drain pan. In this drainage pump, a suction port is formed in the lower part, an upper part is opened, and a blade is rotatably provided in a housing which is a pump body provided with a discharge port on a side, and the blade is disposed on an upper part of the opening of the housing. It is rotated by a motor fixed through a cover. The drive shaft of the motor is rotatably connected to the shaft portion of the blade through a through hole formed in the cover, and when the blade is rotated by driving the motor, the drain water stored in the drain pan is sucked. The air is sucked in from the lower end of the blade of the mouth, pumped up along the inner surface of the housing by centrifugal force, and discharged from the discharge port of the casing to the outside.
This type of drainage pump is disclosed in, for example, Patent Document 1 related to the present applicant.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-213770
[Problems to be solved by the invention]
The air treated by the air conditioner includes foreign matters such as dust such as dust and fiber waste floating in the room, and the floating foreign matters are mixed into the drain water and fall into the drain pan.
Drain pump is the drain water this foreign matter is mixed is to discharge from the outlet portion of the discharge passage is sucked from the inlet portion of the suction passage, a corner portion of the turning water flow downstream of the inlet of the discharge passage in this is just drained Since it exists on the track | orbit where the rotational force by the rotary blade of a pump works, foreign substances, such as dust and fiber waste, will be caught and accumulated sequentially in this corner | angular part, the inlet part of a discharge passage will be blocked, and it will cause a pumping failure.
This invention provides the drainage pump which eliminates the malfunction mentioned above.
[0005]
[Means for Solving the Problems]
The drainage pump of the present invention includes, as basic means, a motor, a rotary blade connected to the output shaft of the motor, and a housing including a pump chamber that accommodates the rotary blade. A suction port into which a small-diameter blade of the rotating blade is inserted, a discharge port provided in a side portion of the pump chamber, a cylindrical inner peripheral wall forming the pump chamber, and a discharge extending radially from the pump chamber In a drainage pump having a discharge passage formed at an outlet, a stepped portion is provided at a portion of the inner peripheral wall corresponding to the inlet of the discharge passage, and the stepped portion is provided in a swirling water flow in the pump chamber. On the other hand, a portion of the inner peripheral wall on the downstream side of the stepped portion is formed so as to be offset outward in the radial direction from the upstream portion. Moreover, the said step part can be provided in the edge part of the said swirling water flow upstream in the said inlet part, Furthermore, the said step part can be provided on the axis line of the said discharge passage.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view of a drainage pump to which the present invention is applied, and FIG. 2 is a sectional view of a pump main body.
The drainage pump generally indicated by reference numeral 1 has an electric motor 10, and the electric motor 10 is supplied with power via a line 11. The electric motor 10 is supported by a bracket 20, and a lower end portion of the bracket 20 is connected to a lid member 30 attached to an upper portion of a pump housing (pump main body) 50.
[0007]
The housing 50 is made of plastic and has a pump chamber 52 formed therein. The housing 50 is integrally formed with a suction port 60 and a discharge port 70 that communicate with the pump chamber 52.
The rotary vane 100 is disposed in the pump chamber 52, and the opening of the pump chamber 52 is covered with the lid member 30. A seal member 40 is inserted between the housing 50 and the lid member 30 to prevent drain water from leaking from the pump chamber.
[0008]
The rotary blade has a shaft portion 110, and the output shaft 12 of the electric motor 10 is inserted into a bottomed hole of the shaft portion 110. The lid member 30 has an opening 32 through which the shaft portion 110 passes. A disc-shaped stopper 14 is attached to prevent the drain water ejected from the opening 32 from scattering to the motor side.
[0009]
The rotary blade 100 has a plate-shaped large-diameter blade 120 extending in the radial direction from the shaft portion 110. The large-diameter blade 120 is connected to the plate-shaped small-diameter blade 140 via a tapered connecting portion 130.
The large-diameter blade 120 is accommodated in the pump chamber 52 of the housing 50, and the small-diameter blade 140 is accommodated in the suction port 60.
[0010]
The lower edge and the outer edge of the large-diameter blade 120 are covered with an annular member 160. The annular member 160 includes a cylindrical wall member 164 that covers the outer edge portion of the large-diameter blade 120 and a dish-shaped bottom member 162 that covers the lower edge portion of the large-diameter blade 120 that is continuous therewith. The bottom member 162 has a shape corresponding to the bottom shape of the pump chamber 52 of the housing 50. In the figure, the bottom member 162 is provided with an auxiliary blade 120 ′ standing on the upper surface between the large-diameter blades 120 and connected to the circular wall of the cylindrical wall member 164 in the radial direction with respect to the shaft portion 110. ing. The auxiliary blade 120 ′ may be omitted.
[0011]
The small-diameter blade 140 has a flat plate shape, and the lower end edge 140 a extends to the vicinity of the inlet portion 62 of the suction port 60. The auxiliary small-diameter blade 142 disposed at a position orthogonal to the small-diameter blade 140 has a lower edge portion 142 a away from the inlet portion 62 of the suction port 60 with respect to the lower edge portion 140 a of the small-diameter blade 140. Formed to be.
[0012]
FIG. 3 is a plan view (a) and a front view (b) of the housing according to the first embodiment of the present invention.
The housing 50 has a pump chamber 52 surrounded by an inner peripheral wall 56, and the central portion of the pump chamber 52 communicates with the inlet portion 62 of the suction port 60.
The housing 50 has a pair of attachment portions 54 with the suction port 60 interposed therebetween. The attachment portion 54 has a function of holding the lid member 30.
[0013]
A discharge passage 72 is formed in the discharge port 70 extending in the radial direction from the pump chamber 52. The discharge passage 72 is tapered such that the inner diameter dimension increases from the inlet portion 74 to the outlet portion 76 of the discharge passage that opens to the pump chamber 52.
A stepped portion 56 a is formed in the planar shape of the pump chamber 52 at the boundary between the pump chamber 52 and the inlet portion 74 of the discharge passage 72. The stepped portion 56a is formed so that the downstream portion of the inner peripheral wall 56 with respect to the swirling water flow in the pump chamber 52 is more radially offset than the upstream portion. .
[0014]
FIG. 4 is a plan view showing the relationship between the housing 50 and the rotary blade 100.
In the figure, the rotary vane 100 is rotated in an arrow _{R 1} direction. The stepped portion 56a is provided at the upstream end of the swirling water flow in the discharge passage inlet portion 74 in the same manner as the stepped portion 56a shown in FIG .
[0015]
This configuration, the foreign matter contained in the swirling water flow that flows in the arrow R ₁ direction is no longer possible to adhere to the boundary of the pump chamber 52 and the discharge passage inlet section 74, the experiment can cause pumping failure is removed Confirmed by
[0016]
FIG. 5 is a plan view (a) and a front view (b) of a housing according to the second embodiment of the present invention.
The housing 50 has a pump chamber 52 surrounded by a circumferential wall 56, and the central portion of the pump chamber 52 communicates with the inlet portion 62 of the suction port 60.
The housing 50 has a pair of attachment portions 54 with the suction port 60 interposed therebetween. The attachment portion 54 has a function of holding the lid member 30.
[0017]
A discharge passage 72 is formed in the discharge port 70 extending in the radial direction from the pump chamber 52. The discharge passage 72 is tapered such that the inner diameter dimension increases from the inlet portion 74 to the outlet portion 76 of the discharge passage that opens to the pump chamber 52.
A stepped portion 56 b is formed in the planar shape of the pump chamber 52 at the boundary between the pump chamber 52 and the inlet portion 74 of the discharge passage 72. The stepped portion 56b is provided on the axis of the discharge passage inlet portion 74 and functions in the same manner as the stepped portion 56a in FIGS.
[0018]
It has been confirmed by experiments that this configuration prevents foreign matter from adhering to the drain water generated at the boundary between the pump chamber 52 and the discharge passage inlet 74, and eliminates the cause of pumping failure.
[0019]
【The invention's effect】
According to the drainage pump of the present invention, the stepped portion is provided at a portion corresponding to the inlet portion of the discharge passage in the inner peripheral wall of the pump chamber, and the stepped portion is provided with respect to the swirling water flow in the pump chamber. Since the downstream portion of the stepped portion is formed so as to be offset radially outward from the upstream portion, foreign matters such as floating dust contained in the indoor air sent to the air conditioner are drained. At the same time, when being discharged from the discharge port, it is possible to prevent adhesion near the inlet of the discharge passage. Therefore, it is possible to prevent pumping failure caused by clogging of the discharge port.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the overall structure of a drainage pump according to the present invention.
FIG. 2 is a cross-sectional view of a main part of the drainage pump of the present invention.
FIG. 3 is an explanatory view showing a first embodiment of a housing of a drainage pump according to the present invention.
FIG. 4 is a plan view showing the operation of the first embodiment of the drainage pump housing of the present invention.
FIG. 5 is an explanatory view showing a second embodiment of the housing of the drainage pump of the present invention.
[Explanation of symbols]
1 drainage pump 10 electric motor 20 bracket 30 lid member 50 housing 52 pump chamber 56 inner peripheral wall 56a stepped portion 60 suction port 70 discharge port 72 discharge channel 74 discharge channel inlet unit 76 discharge channel outlet unit 100 rotating blade 120 large diameter blade 140 Small diameter blade 142 Auxiliary small diameter blade

Claims (3)

A motor, a rotating blade connected to the output shaft of the motor, and a housing having a pump chamber for accommodating the rotating blade, the housing including a suction port into which the small-diameter blade of the rotating blade is inserted; A discharge port provided in a side portion of the pump chamber, a cylindrical inner peripheral wall forming the pump chamber, and a discharge passage formed in a discharge port extending radially from the pump chamber In the drainage pump
A stepped portion is provided at a portion of the inner peripheral wall corresponding to the inlet portion of the discharge passage, and the stepped portion is a portion of the inner peripheral wall on the downstream side of the stepped portion with respect to the swirling water flow. The drainage pump is characterized in that is formed so as to be offset toward the outside in the radial direction from the upstream portion.   The drainage pump according to claim 1, wherein the stepped portion is provided at an end of the inlet portion on the upstream side of the swirling water flow.   The drain pump according to claim 1, wherein the stepped portion is provided on an axis of the discharge passage.

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