JP4718053B2 - Self-priming pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-priming pump that makes the pump compact and shortens the self-priming time.
[0002]
[Prior art]
FIG. 4 is a longitudinal sectional view of a conventional self-priming pump 50 having a general structure.
[0003]
As shown in the figure, the casing (A) 51 and the casing (B) 52 are fastened with a partition 53 interposed therebetween to form a pump casing. In the casing (A) 51, a rotating body including a rotor 54 and an impeller 55 is rotatably mounted on a support shaft 57 in a horizontal and horizontal manner via a bearing 56. Further, the casing (B) 52 has a water absorption pipe 58 and a discharge pipe 59 and is provided with a water intake / drain water passage 60 and a priming water tank 61.
[0004]
The impeller 55 is rotated by driving the electric motor, and the priming water is sucked into the vortex chamber of the pump chamber 62 from the priming water tank 61 to start the self-priming operation, sucked from the water suction pipe 58 and introduced into the pump chamber 62 through the water passage 60. The water is sent to the discharge pipe 59 by the circulation action of the impeller 55 and drained to the outside.
[0005]
In addition, during the self-priming operation, the air accumulated in the pump and the water absorption hose is agitated into water by the rotation of the impeller 55 to form bubbles, and these bubbles are completely discharged out of the pump together with water. Water supply operation is started.
[0006]
In the conventional self-priming pump 50 having the above-described configuration, since the rotating body of the impeller 55 is a horizontal horizontal type, the casing (A) 51 and the casing (B) 52 are connected in the horizontal direction, and the pump 50 is long in the horizontal direction. Therefore, the space cannot be effectively used, and the self-priming pump 50 is large.
[0007]
Further, before the operation of the self-priming pump 50 is started, only a part of the impeller 55 is immersed in the priming water. Therefore, there is a problem that the self-priming characteristic at the start of operation is poor and the self-priming operation takes time.
[0008]
Further, during the self-priming operation, the air in the pump and the air sucked from the water absorption pipe 58 are efficiently discharged from the discharge pipe 59 to enable smooth self-priming operation. In addition, there is a problem that the self-priming characteristic is deteriorated by returning to the pump chamber again through the priming water circulation hole.
[0009]
[Problems to be solved by the invention]
The present invention solves the above-described problems, and aims to provide a self-priming pump capable of reducing the self-priming time by reducing the size of the pump and improving the self-priming efficiency. To do.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, a stator, and a rotor provided with a rotor and an impeller disposed inside the stator are attached to a support shaft through bearings, and the upper casing and the lower casing are vertically formed. In the self-priming pump, a water absorption pipe is provided on the upper side of the support shaft arranged in the vertical direction, a water introduction path is provided on the inner side of the rotating body, and the impeller is disposed on the pump lower side of the support shaft. A self-priming pump, which is arranged in a lower pump chamber, absorbs water from the water absorption pipe by rotation of the impeller, and drains from the discharge pipe through the pump chamber and the water supply passage from the water introduction path. .
[0011]
According to the self-priming pump of the present invention, since the rotating body can be accommodated almost in the motor, the self-priming pump can be made compact, particularly in the axial direction. Further, since the impeller blades are always immersed in the priming water, the self-priming characteristic at the start of the self-priming operation can be improved and the self-priming time can be shortened.
[0012]
According to a second aspect of the present invention, there is provided a self-priming pump according to the first aspect, wherein an annular partition plate having a discharge hole and a water circulation hole is provided between the upper casing and the lower casing. is there.
[0013]
With this annular partition plate, the strength of the pump casing can be increased.
[0014]
According to a third aspect of the present invention, a return water window from the discharge pipe to the water supply path is provided at a boundary between the water supply passage and the discharge pipe, and the interior of the casing continues from the discharge port of the pump chamber to the return water window. The self-priming pump according to claim 1 or 2, wherein a wall that forms a passage for guiding the discharge air is provided to prevent the discharge air from returning to the priming circulation hole.
[0015]
According to the self-priming pump of the present invention, the exhaust air flowing into the water supply passage together with the circulating water from the pump chamber is efficiently discharged to the outside from the discharge pipe, and the air pushed up to the return water window reaches the priming circulation hole. Due to the difference in elevation, the return water does not return to the priming circulation hole again, and the air in the pump is completely discharged to the outside in a short time.
[0016]
A fourth aspect of the present invention is the self-priming pump according to any one of the first to third aspects, wherein the discharge pipe is disposed on an outer peripheral portion of the stator.
[0017]
In this self-priming pump, the water passage from the water absorption to the discharge is simplified, and the centrifugal force generated by the impeller is discharged without being reduced, so that the discharge efficiency of the pump can be improved.
[0018]
A fifth aspect of the present invention is the self-priming pump according to any one of the first to fourth aspects, wherein the stator is molded with a thermosetting resin and incorporated in the resin.
[0019]
In this self-priming pump, the waterproofness of the stator is improved and the effect of shielding vibration and noise is improved.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0021]
(First embodiment)
FIG. 1 is a longitudinal sectional view of the self-priming pump 1 of the first embodiment.
[0022]
The rotating body 5 of the self-priming pump 1 is composed of an impeller 2 and a rotor 3 mounted on a bearing 6, and the bearing 6 is rotatably attached to a support shaft 4 via a thrust washer 7.
[0023]
The support shaft 4 is fixed by an upper casing 8 and a lower casing 9 so that the axis 4a is in the vertical direction.
[0024]
The upper casing 8 is provided with a water absorption pipe 10 on the vertical upper side of the support shaft 4, and has a circulating water path 11, a water supply path 12 and a discharge pipe 13, and the water supply path 12 and the subsequent discharge pipe 13 are connected to the stator 14. It arrange | positions along an outer peripheral part.
[0025]
The stator 14 is housed in a donut-shaped recessed portion of the upper casing 8 along the outer periphery of the rotating body 5 disposed at the center of the upper casing 8 and is covered with a steel plate or a resin outer shell 26.
[0026]
Further, as shown in FIG. 1, the stator 14 is molded by a thermosetting resin 27, and the connection portion of the iron core 22, the winding 23, the substrate 24, and the lead wire 25 of the stator 14 is in the resin 27. It may be molded and incorporated.
[0027]
The lower casing 9 is provided with a priming water tank 16 and a self-priming circulation hole 17 for sending priming water to the pump chamber 15.
[0028]
The upper casing 8 and the lower casing 9 are fastened with a waterproof packing 21 made of rubber plate or the like having a priming water circulation hole 18 and a discharge opening 19 interposed therebetween, and accommodates the rotating body 5 to accommodate a vertical self-priming pump. 1 is configured.
[0029]
The pump chamber 15 accommodates the impeller 2 formed by a plurality of radial blades provided at the lower part of the rotating body 5, and the pump chamber 15 is located at the lowermost part of the self-priming pump 1. The priming water flows from the priming water tank 16 through the self-priming circulation hole 17 so that the impeller 2 is always immersed in the priming water.
[0030]
Further, between the upper casing 8 and the lower casing 9, together with the packing 21 for waterproofing, an annular hole made of a synthetic resin plate, a metal plate, or the like, in which a discharge hole 19a and a water circulation hole 18a are opened. A partition plate 31 can be arranged to form a pump casing.
[0031]
With the above configuration, the pump rotor 5 can accommodate most of the impeller 2 except for the tip of the impeller 2 in the motor, so that the self-priming pump 1 can be made compact. In particular, the pump shaft direction can be reduced in thickness and the weight can be reduced.
[0032]
Further, when the self-priming operation is started by driving the rotating body 5, since the entire impeller 2 is under the surface of the water, the suction time of the priming water is shortened, the self-priming characteristic at the start of self-priming is improved, and the self-priming time is reduced. It can be shortened.
[0033]
When the water supply starts in earnest, the water absorbed from the water absorption pipe 10 passes through the water introduction path 20 inside the rotating body 5 and is sucked and circulated into the pump chamber 15, and further from the discharge port 19 to the stator 14. The water is discharged from the discharge pipe 13 through the water supply passage 12 arranged on the outer periphery of the discharge pipe 13.
[0034]
Since the water passes through the simple passage as described above, there are few obstacles for losing the water flow, and the discharge pipe 13 is disposed on the outer periphery of the stator 14, so that the centrifugal force of the circulating water generated by the impeller is reduced. Thus, the discharge efficiency can be improved, and the pump structure can be simpler than the conventional self-priming pump.
[0035]
In addition, the stator 14 that covers the outer periphery of the rotating body 5 serves as a shield for vibration and noise generated by the rotating body 5, so that the noise of the self-priming pump 1 can be reduced.
[0036]
Furthermore, when the stator 14 is molded with resin, the waterproofness in the stator 14 is further improved, and not only is it prevented from malfunctioning due to leakage or rust, but also the vibration and noise of the rotating body 5 are prevented. The shielding effect can also be improved.
[0037]
(Second Embodiment)
The self-priming pump 30 according to this embodiment further improves the self-priming characteristics of the self-priming pump 1 formed in the vertical shape described in the first embodiment. That is, the pump air 39 is efficiently discharged during the self-priming operation.
[0038]
FIG. 2 is a longitudinal sectional view of the self-priming pump 30 according to the second embodiment (cross section taken along line AA in FIG. 3), and FIG. 3 is a plan view thereof. The main structures of the upper and lower casings 8 and 9, the rotating body 5, the pump chamber 15 and the like of the self-priming pump 30 are the same as those of the self-priming pump 1 of the first embodiment.
[0039]
In this self-priming pump 30, a return water window 35 having a window hole 36 is provided at the entrance of the discharge pipe 13, and a water supply passage for sending the circulating water 40 from the discharge port 19 into the casing following the return water window 35. The self-priming pump 30 is formed by providing walls 32 and 33 for forming the discharge pipe portion 34.
[0040]
The walls 32, 33 are vertical walls that divide the upper casing 8 formed upward from the discharge port 19 to the window hole 36 of the return water window 35, and form the discharge pipe portion 34 in the upper casing 8, Through this, the circulating water 40 and the exhaust air 37 are sent to the discharge pipe 13 without waste. Here, excess water that could not be discharged from the discharge pipe 13 becomes return water 41 and circulates in the pump again. The baffle plates 42 and 42 provided at two locations decelerate the water flow from the priming water circulation hole 18 to the pump chamber. Return to 15.
[0041]
In the self-priming pump 30 having the above-described configuration, the circulating water 40 sent from the pump chamber 15 and the discharge air 37 contained therein pass through the discharge port 19 through the discharge pipe portion 34 provided in the upper casing 8. The exhaust air 38 pushed up to the return water window 35 and separated from the circulating water 40 is efficiently discharged out of the pump from the discharge pipe 13.
[0042]
As shown in FIG. 2, the return water window 35 and the water return hole 18 have a height difference (H), and the air is light with respect to water. Therefore, the discharge once pushed up to the height of the return water window 35. Since the air 38 is not included in the return water 41 returning from the window hole 36 into the pump, the air 38 circulates in the pump together with the return water 41 and does not return to the pump chamber 15 from the convection recirculation hole 18 again. Air is discharged to the outside, and the self-priming efficiency of the self-priming pump 30 can be improved.
[0043]
Further, by providing the discharge pipe portion 34 by forming the walls 32 and 33, the self-priming performance can be improved, the strength of the pump casing can be increased, and the durability of the self-priming pump 30 can be improved.
[0044]
【The invention's effect】
As described above, in the self-priming pump of the present invention, the rotating body portion can be accommodated substantially in the motor, and the pump can be made compact. In particular, the pump can be thinned. In addition, vibration and noise generated by the pump can be easily cut off, and noise can be reduced.
[0045]
In the self-priming pump of the present invention, the impeller is always immersed in priming water, and there is a difference in height between the discharge pipe portion serving as a discharge air passage in the casing, the return water window, and the priming water circulation hole. Since the exhaust air is efficiently discharged to the outside, the self-priming time can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a self-priming pump according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a self-priming pump according to a second embodiment of the present invention.
FIG. 3 is a plan view of a self-priming pump according to a second embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of a conventional self-priming pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,30 ... Self-priming pump 2 ... Impeller 3 ... Rotor 4 ... Support shaft 4a ... Support shaft axis 5 ... Rotating body 6 ... Bearing 8 ... Upper casing 9 ... Lower casing 10 ...... Water absorption pipe 11 ...... Circulating water channel 12 ...... Water feeding passage 13 ...... Discharge pipe 15 ...... Pump chamber 16 ...... 19a: Discharge hole 20 of annular partition plate ... Water introduction path 27 ... Thermosetting resin 31 ... Circular partition plate 32, 33 ... Wall 34 ... Discharge pipe portion 35 ... Return water window 37, 38 …… Exhaust air H …… Refer to the return window and the height difference of the water circulation hole

Claims (5)

A stator and a rotor provided with a rotor and an impeller disposed inside the stator are attached to a support shaft via a bearing,
In the self-priming pump formed vertically by the upper casing and the lower casing,
A water absorption pipe is provided above the support shaft arranged in the vertical direction,
And a water introduction path is provided inside the rotating body,
Furthermore, the impeller is arranged in the pump chamber at the bottom of the pump below the support shaft,
A self-priming pump characterized in that water is absorbed from the water absorption pipe by rotation of the impeller, and drained from the discharge pipe through the water introduction passage through the pump chamber and the water supply passage. 2. The self-priming pump according to claim 1, wherein an annular partition plate having a discharge hole and a water recirculation hole is disposed between the upper casing and the lower casing. At the boundary between the water supply passage and the discharge pipe, a return water window from the discharge pipe toward the water supply passage is provided,
Providing a wall that forms a passage that guides the exhaust air from the discharge port of the pump chamber into the casing following the return water window;
3. The self-priming pump according to claim 1, wherein exhaust air is prevented from returning to the priming water circulation hole. The self-priming pump according to any one of claims 1 to 3, wherein the discharge pipe is disposed on an outer peripheral portion of the stator. The self-priming pump according to any one of claims 1 to 4, wherein the stator is molded with a thermosetting resin and incorporated in the resin.

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