JP4560866B2 - pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump that can reduce noise and vibration and improve pump efficiency.
[0002]
[Prior art]
In a conventional pump, a rear blade is formed in the shape of a groove on the rear shroud surface of the impeller with respect to the main blade. As a result, when the impeller rotates, the back vane formed in the shape of a groove together with the main vane of the impeller also acts to improve the self-priming performance of the pump. Some have a front shroud with grooves.
[0003]
Below, the impeller of the conventional pump is demonstrated. FIG. 4 is a structural diagram of a conventional pump having an impeller having grooves formed on the surface of the front shroud. In FIG. 4, 1 is an impeller, 2 is a driven magnet that is integrally formed with the impeller 1 and rotates the impeller 1, 3 is a bearing press-fitted concentrically to the impeller 1, and 4 is a bearing 3. The shaft for supporting 5 is a motor frame that forms the appearance of the pump, and 6 is a stator that is press-fitted concentrically to the motor frame 5, and windings having the required number of turns and wire diameter are provided according to the driving voltage and current. It is rolled up. Reference numeral 7 denotes a control board for controlling the pump.
[0004]
Reference numerals 8a and 8b denote bearing plates for supporting the load in the thrust direction by contacting the bearing 3 press-fitted into the impeller 1 when the impeller 1 moves in the axial direction. Reference numeral 9 denotes an external appearance of the pump, and a casing that covers the impeller 1 and forms a pump portion, and 10 is an O-ring for preventing water leakage. Reference numeral 11 denotes a partition wall that separates a pump unit including the impeller 1, the driving drive magnet 2, the bearing 3, and the like from a motor unit including the stator 6, the control board 7, and the like.
[0005]
FIG. 5A is a detailed view of an impeller disposed in a conventional pump, and FIG. 5B is a sectional view taken along the line ZZ. In FIG. 5A, 101 is a front shroud, 102 is a rear shroud, 103 is a mouse portion, and a driven magnet 2 is integrally formed with components forming the rear shroud 102. On the surface of the front shroud 101, back blades are formed in the form of grooves 105 (FIG. 5B) with respect to the main blades. The front shroud 101 and the rear shroud 102 are fixed by welding.
[0006]
The operation of the pump having the impeller having the groove formed on the surface of the conventional front shroud configured as described above will be described. First, when a control current for driving is applied to the stator 6, the driven magnet 2 reacts to the rotation, and the impeller 1 further provided with the driven magnet 2 rotates. When the impeller 1 rotates, energy is given to the water by its pumping action, and water absorption and water discharge start.
[0007]
[Problems to be solved by the invention]
However, as can be seen from FIG. 4, there is a gap between the front shroud 101 of the impeller 1 and the casing 9, and negative pressure is generated on the suction side of the impeller 1 and positive pressure is generated on the discharge side. Therefore, the water that has exited the impeller 1 returns to the suction side, that is, a phenomenon occurs in which leakage occurs and the efficiency of the pump deteriorates.
[0008]
Therefore, a pump has been proposed in which a groove is provided on the surface of the front shroud 101 to serve as a blade to prevent leakage and increase efficiency. However, when the groove 105 is formed in the front shroud 101, the depth of the groove 105 cannot be made so large. In particular, when the impeller 1 is made of sheet metal or the like, the processing of the groove 105 is almost impossible. Further, the portion of the groove 105 is thin. For example, even when the impeller 1 is formed by resin molding, there is a problem that uneven portions are generated in the thickness and weakened in strength.
[0009]
Further, speeding up is desired for miniaturization of the pump, but pulsation occurs in proportion to the number of blades. The waveform is bordered by the blade position, which causes noise and vibration.
[0010]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a pump that increases the efficiency of the pump without reducing the strength of the impeller, and that has less noise and vibration during operation.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the pump of the present invention is formed by integrally forming the main blades forming the impeller with the front shroud, thereby increasing the efficiency of the pump without reducing the strength of the impeller. In addition, a pump with less noise and vibration during operation can be realized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, the main blade forming the impeller is formed integrally with one of the front shroud or the rear shroud, and the surface of the shroud formed integrally with the main blade has the same center as the main blade. This is a pump in which a groove serving as a back blade is formed on a line, whereby a groove serving as a back blade can be formed on the surface of the shroud of the impeller, and the thickness of the impeller can be made uniform, thereby improving the strength of the impeller.
[0013]
Then, it is possible to the groove for forming a groove serving as a rear vanes formed deeply on the same center line as the main blade on the sheet shroud surface, to improve the action of the rear vanes.
[0014]
According to a second aspect of the invention, a pump discharge angle is the same as the discharge angle of the main blade grooves formed in the shroud, the main discharge angle of the groove as the rear vanes formed on the sheet shroud surface Since it matches the discharge angle of the blades, it covers the drop of the waveform that occurs at the position of the main blades to improve noise and vibration.
[0018]
According to a third aspect of the present invention, the groove is a sink formed on the one shroud side of the intersection of the main blade and the shroud when the main blade of the impeller and the one shroud are integrally formed. a pump according to 1 or claim 2, it is possible by considering the thickness of the front shroud and the main blade at the impeller design, to form a groove which becomes the back vanes sheet shroud during molding.
[0022]
Hereinafter, an embodiment of the present invention will be described.
[0023]
FIG. 1 is a structural diagram of a pump having an impeller having a groove formed integrally with the front shroud on the surface of the front shroud according to an embodiment of the present invention, and FIG. 2 (a) is an embodiment of the present invention. FIG. 2B is a detailed view of the impeller having a groove formed on the surface of the front shroud by integral molding with the front shroud, FIG. 2B is an XX cross-sectional view of the impeller, and FIG. A detailed view of an impeller having a groove formed integrally with the rear shroud on the surface of the rear shroud in the embodiment, FIG. 3B is a YY sectional view of the impeller.
[0024]
In FIG. 1, reference numeral 1 denotes an impeller, 2 denotes a driven magnet that is integrally formed with the impeller 1 and rotates the impeller 1, 3 is a bearing that is integrally formed with the impeller 1, and 4 is a bearing 3. 5 is a motor frame that forms the external appearance of the pump, 6 is a stator that is press-fitted concentrically to the motor frame 5, and windings having the necessary number of turns and wire diameter according to the driving voltage and current Is wound. Reference numeral 7 denotes a control board for controlling the pump. Reference numerals 8a and 8b denote bearing plates for supporting the load in the thrust direction by contacting the bearing 3 press-fitted into the impeller 1 when the impeller 1 moves in the axial direction. Reference numeral 9 denotes an external appearance of the pump, and a casing that covers the impeller 1 and forms a pump portion, and 10 is an O-ring for preventing water leakage. Reference numeral 11 denotes a partition wall that separates a pump unit including the impeller 1, the driving drive magnet 2, the bearing 3, and the like from a motor unit including the stator 6, the control board 7, and the like.
[0025]
In FIG. 2A, 101 is a front shroud, 102 is a rear shroud, 103 is a mouth portion, and 104 is a main wing, which are formed integrally. Further, a driven magnet 2 and a bearing 3 disposed concentrically are integrally formed with the components forming the rear shroud 102. In FIG. 2B, reference numeral 105 denotes a groove formed on the surface of the front shroud 101 and has a function of a back blade with respect to the main blade 104. The discharge angle of the groove 105 is the same as the discharge angle of the main blade 104. Further, the front shroud 101 and the rear shroud 102 are fixed by welding.
[0026]
In FIG. 3 (a), 101 is a front shroud, 102 is a rear shroud, 103 is a mouth portion, 104 is a main blade, and the components forming the rear shroud 102 are arranged by the driven magnet 2 and concentric. The bearing 3 is integrally formed. In FIG. 3B, reference numeral 106 denotes a groove formed on the surface of the rear shroud 102 on the same center line as the main blade 104, and has a function of a back blade on the main blade. The discharge angle of the groove 106 is the same as the discharge angle of the main blade 104. Further, the front shroud 101 and the rear shroud 102 are fixed by welding.
[0027]
The operation of the pump configured as described above will be described. First, when a control current for driving is applied to the stator 6, the driven magnet 2 reacts to the rotation, and the impeller 1 further provided with the driven magnet 2 rotates. When the impeller 1 rotates, energy is given to the water by its pumping action, and water absorption and water discharge start.
[0028]
However, as can be seen from FIG. 1, there is a gap between the front shroud 101 of the impeller 1 and the casing 9, and negative pressure is generated on the suction side of the impeller 1 and positive pressure is generated on the discharge side. Therefore, the water that has exited the impeller 1 returns to the suction side again, that is, a phenomenon occurs in which leakage (reflux) occurs and the efficiency of the pump deteriorates.
[0029]
Therefore, the impeller 1 of this pump is manufactured by integrally forming the front shroud 101 and the main blade 104 that form the impeller 1, and steals meat at the point where sink marks occur at the intersection of the front shroud and the main blade during molding. The meat stealing shape is the groove 105. Thereby, since the groove | channel 105 can be formed easily and thickness can be made uniform, the intensity | strength of the impeller 1 improves.
[0030]
In the present embodiment, the groove shape is V-shaped, PPE is used as the material of the impeller 1, and the thickness of the front shroud 101 and the main blade 104 is basically 2 mm. The number of main blades 104 is set to 22, but in this case, 22 pulsations occur per rotation of the impeller. In the present embodiment, the grooves 105 provided on the surface of the front shroud 101 are configured to coincide with the center line of the main blade 104, and the number thereof is set to 22. Thereby, since the vicinity of the peak of the waveform created by the groove 105 overlaps the position where the waveform of the pulsation generated by the main blade 104 falls, the height difference of the pulsation is alleviated. That is, one of the causes of noise and vibration is reduced.
[0031]
Further, the groove 105 formed in the front shroud 101 has the effect of a back blade and pushes the surrounding fluid outward or forms a stable liquid ring with the casing. Thereby, the recirculation | reflux amount to the suction inlet side reduces, and the efficiency of a pump rises.
[0032]
The passage through which the discharge-side fluid that has become positive pressure returns to the negative-pressure suction side is not only between the front shroud 101 and the casing 9. Some return to the suction side through the back side of the impeller 1, that is, the rear shroud 102 side. There is also a gap between the bearing 3 formed integrally with the impeller 1 and the shaft 4 that supports it, and the recirculation of the bearing 3 also causes a reduction in pump efficiency. When the influence of the reflux from here is large, it is preferable to provide the groove 106 in the rear shroud 102 in the same manner as the groove 105 is provided in the front shroud 101.
[0033]
【The invention's effect】
As described above, in the pump of the present invention, the main blade is formed integrally with the front shroud or the rear shroud, so that the thickness of the impeller can be made uniform, so that the strength of the impeller can be improved and the thickness is uniform. a groove serving as rear vanes Ru can be formed at a position fell of waveform pulsations main blades cause by the. And the back blade formed in the shroud pushes the surrounding fluid outward, or forms a stable liquid ring with the casing, thereby reducing the amount of reflux to the suction port and increasing pump efficiency. Ru it is possible to reduce the one of the factors of noise and vibration. Moreover, since the discharge angle of the grooves formed on the shroud surface is matched to the discharge angle of the main blade, Ru can reduce noise and vibration and covers a drop of the waveform generated in the position of the main blade.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a pump having an impeller having a groove formed integrally with a front shroud on the surface of the front shroud according to an embodiment of the present invention. Detailed view of impeller having groove formed integrally with front shroud on front shroud surface in form (b) XX sectional view of impeller in one embodiment of the present invention FIG. Detailed view of impeller having groove formed integrally with rear shroud on rear shroud surface in one embodiment of the present invention (b) YY sectional view of impeller in one embodiment of the present invention. FIG. 4 is a structural diagram of a pump having an impeller having a groove formed on the surface of a conventional front shroud. FIG. 5A is a detailed view of an impeller disposed in a conventional pump. FIG. 4B is disposed in a conventional pump. ZZ cross section of the impeller Description]
1 impeller 2 driven magnet 101 front shroud 102 rear shroud 104 main blade 105 groove (front shroud side)
106 Groove (rear shroud side)

Claims (3)

The main blade forming the impeller is molded integrally with one of the front shroud or the rear shroud, and a groove serving as a back blade is formed on the same center line as the main blade on the surface of the shroud molded integrally with the main blade. Features a pump. The pump according to claim 1, wherein a discharge angle of a groove formed in the shroud is the same as a discharge angle of a main blade . The groove claim 1 or claim, characterized in that the main blade and one of the shroud of the impeller when molded integrally, a sink which is generated on the one shroud side of the intersection of the main blade and the shroud 2. The pump according to 2 .

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