JP2004100457A - Pump for sucking up bath water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump for sucking up bath water, capable of facilitating air vent in a pump casing. <P>SOLUTION: An air vent hole 18 penetrating outwards in the diametrical direction is formed on a casing outer-periphery wall of a pump room 12 storing an impeller. A guide means 16 is provided to cover the outside opening of the air vent hole and change the direction of water flowing out of the air vent hole and guide the water. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bath water pump, and more particularly to a structure for preventing air lock due to air pools in a pump casing.
[0002]
[Prior art]
It is well known that electric pumps are used for domestic use to pump excess water in a bathtub into a washing machine. This pump is a kind of submersible pump, in which a hose connected to a discharge port is extended to a target washing machine, and by operating the pump, water in a bathtub is pumped and supplied to the washing machine.
[0003]
By the way, when this pump is operated, if water remains in the hose in the previous operation, air will be trapped between the remaining water and the pump casing, and a so-called airlock will occur and water will be pumped up. Can not be done.
[0004]
In addition, when air is sealed in the pump casing, there is a case where the pump itself does not sink in the water even if the pump is put in the water of the bathtub, and the pump itself floats and cannot even be operated.
[0005]
Conventionally, there is a pump in which a weight is attached to the pump itself so that the pump sinks by its own weight even if air is contained in the pump casing. However, it is disadvantageous in terms of handleability due to the increased weight of household products. In addition, as a solution by the handling method on the user side, the air in the pump casing is evacuated by changing the posture of the pump in various ways, such as turning the pump itself in the bathtub or turning the pump upside down. In some cases.
[0006]
The applicant of the present application does not know the existence of prior art documents related to the invention of this application. Therefore, there is no prior art document information to be described.
[0007]
[Problems to be solved by the invention]
The present invention has been made to solve the above-mentioned problems in the conventional bath water pump. Accordingly, an object of the present invention is to provide a bath water pump for easily removing air from a pump casing.
[0008]
[Means for Solving the Problems]
The bath water pump according to the present invention is provided with the following configuration in order to solve the above-mentioned problems and achieve the object. That is, the air vent hole is formed in the casing of the pump chamber that houses the impeller. This air vent hole is preferably formed in the outer peripheral wall of the casing of the pump chamber and penetrates radially outward. Further, it is preferable that a guide means is provided for covering the outer opening of the air vent hole and changing the direction of water flowing out of the air vent hole to guide the water.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a bath water pump according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of a bath water pump according to the present invention. In the figure, reference numeral 10 denotes an impeller, which is driven by a motor 11 and rotates in a pump chamber 12. Reference numeral 13 denotes a discharge pipe communicating with the inside of the pump chamber 12. The upper end of the discharge pipe 13 is a hose connection port. A suction port 14 is opened at the bottom of the pump chamber 12 toward the center of the impeller 10. A strainer 16 is attached to a lower portion of the pump body 15 having the above configuration so as to be integrated with the pump body 15. The lower part of the pump body 15 is formed with a male screw, and the upper end of the strainer 16 is formed with a female screw. The strainer 16 is provided so as to cover the suction port 14 of the pump chamber 12. The bottom surface is opened in a lattice shape to allow inflow of water, and foreign substances such as hair and dirt flow into the pump chamber 12. To prevent A filter 17 is held in the housing of the strainer 16 so as to cover the suction port 14. The filter 17 also prevents fine foreign matter and dust from flowing into the pump chamber 12.
[0010]
Although the casing forming the pump chamber 12 is composed of a plurality of members as shown in the drawing, the shape of the pump chamber 12 itself is such that water subjected to centrifugal force due to rotation of the impeller 10 flows into the discharge pipe 13. Thus, it is shaped to be guided radially outward and upward by a conical surface. An air vent hole 18 is formed in a portion of the casing constituting the outermost peripheral portion near the upper end of the pump chamber 12 so as to penetrate the wall body outward in the radial direction. In the example shown in the drawing, two air vent holes 18 are formed in a direction 180 degrees opposite to each other in the radial direction at a position beyond the slope formed by the conical surface. With this configuration, even if air enters the pump chamber 12 during operation, a part of the water subjected to centrifugal force due to the rotation of the impeller 10 flows out of the air vent hole 18 to the outside of the pump chamber together with the air. To release air. The number of air vent holes 18 may be increased or decreased as necessary.
[0011]
At a place where the air vent hole 18 is open outside the casing, a guide portion 19 is formed so as to cover the opening so as to guide water flowing radially outward from the air vent hole 18 downward. Is provided. The guide portion 19 is formed integrally with the housing of the strainer 16, has a substantially U-shaped cross section, extends downward between the housing of the strainer 16, and opens at the lower end. The flow path 20 is formed. The guide portion 19 forms a slight gap between the strainer 16 and the outer peripheral surface of the pump body 15 in a state where the strainer 16 is assembled to the pump body 15, and the air flowing out of the air vent hole 18 flows through the guide flow from the gap. It is also possible to go out of the road 20. Of course, it is also possible to flow in the guide passage 20 together with the water flowing out of the air vent hole 18 and to exit the guide passage 20 from the lower end opening.
[0012]
The guide portion 19 is relatively wide in the circumferential direction of the strainer housing so that when the housing of the strainer 16 is screwed to the pump body 15, the opening of the air vent hole 18 is surely covered at the final position where the screw is tightened. Are formed over the dimensions of
[0013]
By designing the pressure loss (i.e., the flow resistance to the water flowing out of the pump chamber through this portion) by the air vent hole 18 and the guide portion 19 to be sufficiently large, the water from the air vent hole 18 can be reduced. It is possible to supply desired water from the discharge pipe 13 while causing leakage. That is, the water supply is performed while the water leakage is positively performed, and the air in the pump chamber is vented. Therefore, if the position of the air vent hole 18 is at a low position on the slope of the conical surface or is an excessively large hole, the amount of water leakage therefrom is so large that water supply as intended cannot be performed. By appropriately combining the position and size of the air vent hole 18 and the magnitude of the pressure loss caused by the guide portion 19, the desired water supply can be performed while air is evacuated from the pump chamber. Of course, if the position and size of the air vent hole 18 are appropriate, the purpose of air vent and water supply can be achieved without providing a guide portion.
[0014]
【The invention's effect】
The bath water pump for pump constructed as described above can be evacuated from the pump chamber simply by submerging in the bathtub and operating normally.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a bath water pump according to the present invention.
[Explanation of symbols]
Reference Signs List 10 impeller 11 motor 12 pump chamber 13 discharge pipe 14 suction port 15 pump body 16 strainer 17 filter 18 air vent hole 19 guide section 20 guide flow path

Claims (3)

A pump for pumping bath water, wherein an air vent hole (18) is formed in a casing of a pump chamber (12) accommodating an impeller. A pump for pumping bath water, wherein an air vent hole (18) penetrating radially outward is formed in an outer peripheral wall of a casing of a pump chamber (12) accommodating an impeller. An air vent hole (18) penetrating radially outward is formed in a casing outer peripheral wall of the pump chamber (12) that houses the impeller,
A pump for bathing water, comprising: a guide means (19) for covering an outside opening of the air vent hole and changing and guiding a direction of water flowing out of the air vent hole.

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