Vortex pump

Abstract

The objective is to improve motor cooling performance in a vortex pump without significantly changing the size of the motor's air vents. [Solution] The motor comprises a double-shaft motor 2 with a rotating shaft 10 extending laterally, an impeller 5 provided on one side of the rotating shaft of the motor 2, a pump casing 3 that rotatably houses the impeller 5 and has a discharge port formed therein for discharging liquid sucked in by the rotation of the impeller 5, a cooling fan 6 provided on the other side of the rotating shaft 10 of the motor 2, and a fan cover 7 that rotatably houses the cooling fan 6 and has an intake port 7a formed therein for drawing in air by the rotation of the cooling fan 6. Multiple cylindrical holes are provided on the outer surface of the motor 2 that connect the inside and outside of the outer surface of the motor 2, and the entire circumference of the outer edge of the motor casing at the holes is rounded, thereby increasing the amount of air flowing into the motor and enhancing the cooling effect.

Description

Technical Field

[0001] The present invention relates to a self-priming vortex pump.

Background Art

[0002] Conventionally, a self-priming vortex pump used for sucking up water at a deep position such as a well will be described with reference to the drawings for a self-priming vortex pump 101 according to Patent Document 1 and Patent Document 2. FIG. 12 is a schematic view showing the configuration of the vortex pump 101.

[0003] As shown in FIG. 12, the vortex pump 101 is roughly divided into a pump casing 102 having an impeller for pressurizing water inside, a motor 105 for rotating the impeller, and a cooling unit for cooling the motor 105. The cooling unit is composed of a cooling fan 106 and a fan cover 107. The atmosphere passes through air holes provided in the fan cover 107 and is pressurized by the cooling fan 106. A part of the pressurized air flows along the wall surface of the fan cover 107 to the side surface of the motor​​​​​​​​​​​

[0005] [Patent Document 1] Japanese Patent Publication No. 2019-163715 [Patent Document 2] Japanese Patent Publication No. 2023-48219 [Overview of the project] [Problems that the invention aims to solve]

[0006] In conventional vortex pump cooling mechanisms, the amount of air flowing along the side of the motor frame and the amount of air flowing inside the motor affect the motor cooling effect. Therefore, a problem existed in that the motor would not be adequately cooled if these amounts of air were insufficient. Furthermore, the first, second, and third openings on the motor serve as outlets for flames to escape to the outside of the motor in the event of ignition inside the motor, so from a safety standpoint, it is desirable for them to have the smallest possible diameter.

[0007] Therefore, the present invention aims to solve the above problems by increasing the amount of air flowing into the motor without significantly changing the size of the motor's air holes, thereby improving motor cooling performance and providing a higher-output vortex pump. [Means for solving the problem]

[0008] To achieve this objective, the vortex pump according to the present invention comprises a motor with two rotating shafts extending laterally, an impeller provided on one of the rotating shafts of the motor, and a discharge valve that rotatably houses the impeller and discharges the liquid sucked in by the rotation of the impeller. The motor comprises a pump casing with an outlet formed therein, a cooling fan provided on the other side of the motor's rotating shaft, and a fan cover that rotatably houses the cooling fan and has an intake port formed therein for drawing in air as the cooling fan rotates. The motor's outer casing has a communication passage on its lower surface that connects the inside and outside of the motor's outer casing, and a plurality of cylindrical holes on the surface of the motor's outer casing facing the cooling fan that connect the inside and outside of the motor's outer casing, and the entire circumference of the outer edge of the holes on the outer surface of the motor's outer casing is rounded, thereby achieving the intended purpose. [Effects of the Invention]

[0009] According to the present invention, pressurized air from a cooling fan flows efficiently into the motor, resulting in high cooling performance for the motor. [Brief explanation of the drawing]

[0010] [Figure 1] Perspective view of the vortex pump according to Embodiment 1 of the present invention [Figure 2] Exploded perspective view showing the configuration of the vortex pump. [Figure 3] Cross-sectional view of the motor of the vortex pump. [Figure 4] Cross-sectional view of the pump casing of the vortex pump. [Figure 5] Cross-sectional view showing the airflow inside the motor of the vortex pump. [Figure 6] Perspective view showing the motor of the vortex pump. [Figure 7] This diagram shows a cross-section of the motor housing of the vortex pump. [Figure 8] Perspective view showing the motor of the vortex pump according to Embodiment 2 of the present invention. [Figure 9] This diagram shows a cross-section of the motor housing of the vortex pump. [Figure 10] Perspective view showing the motor of the vortex pump according to Embodiment 3 of the present invention. [Figure 11] This diagram shows a cross-section of the motor housing of the vortex pump. [Figure 12]Perspective view showing the configuration of a conventional vortex pump [Figure 13] Rear view showing the configuration of a conventional vortex pump

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0012] (Embodiment 1) Hereinafter, the vortex pump 1 according to Embodiment 1 of the present disclosure will be described with reference to FIGS. 1 to 7. FIG. 1 is a perspective view showing the configuration of the vortex pump 1. FIG. 2 is an exploded perspective view showing the configuration of the vortex pump 1. FIG. 3 is a schematic cross-sectional view of the motor 2 of the vortex pump 1. Hereinafter, in some cases, the vertical direction in the state where the vortex pump 1 is installed (corresponding to the installation state according to the present disclosure) as shown in FIG. 1 will be described as the up-and-down direction. Also, in some cases, the side of the cooling fan 6 of the vortex pump 1 shown in FIG. 1 will be described as the "rear surface", and the side facing the rear surface will be described as the "front surface".

[0013] As shown in FIGS. 1 and 2, the vortex pump 1 includes a motor 2, a pump casing 3, a pump casing cover 4, a cooling fan 6, an impeller 5, and a fan cover 7. On one side (front side) in the rotational axis direction (front-rear direction) of the motor 2, the pump casing 3 and the impeller 5 are arranged, and on the other side (rear side) in the rotational axis direction (front-rear direction) of the motor 2, the cooling fan 6 and the fan cover 7 are arranged.

[0014] As shown in FIG. 3, the motor 2 includes a motor frame 8 which is the outer shell of the motor 2, and a terminal cover 9 at the top. Inside the motor frame 8, a rotor 11 having a rotating shaft of both axes 10 and a stator 12 are provided to generate torque. The terminal cover 9 is fixed to the motor 2.

[0015] As shown in FIGS. 2 and 3, the motor 2 is a two-shaft motor. An impeller 5 is fixed to a protruding portion on one side of the rotating shaft 10, and a cooling fan 6 is fixed to a protruding portion on the other side of the rotating shaft 10. The output torque of the motor 2 can be transmitted to both the impeller 5 and the cooling fan 6.

[0016] According to this configuration, the drive unit serves as a power source for the pump unit and at the same time as a power source for the cooling fan 6. By rotating the cooling fan 6, the heat generated by the motor 2 itself can be suppressed by air cooling.

[0017] As shown in FIG. 4, the upper part of the pump casing 3 is provided with a suction port 17 and a discharge port 18, and pipes (not shown) are attached to each of them. Inside the pump casing 3, there is a flow path communicating the suction port 17 and the discharge port 18, and the flow path is provided with a suction flow path 19, a volute chamber 20 (volute chamber flow path 22), and a gas-liquid separation chamber 21. An impeller 5 is rotatably provided in the volute chamber 20. When the impeller 5 rotates, liquid is sucked in from the suction port 17, and the liquid sucked in from the suction port 17 is sent to the discharge port 18 through the suction flow path 19, the volute chamber 20 (volute chamber flow path 22), and the gas-liquid separation chamber 21 in sequence. The volute chamber 20 is formed in the lower part of the pump casing 3, specifically, it is arranged below the suction port 17 and the discharge port 18. That is, the pump casing 3 is a volute chamber 20 in which the impeller 5 is accommodated, and in the installed state, it includes a volute chamber 20 installed below the discharge port 18. In the volute chamber 20, a volute chamber flow path 22 is formed in an arc shape at a portion corresponding to the outer peripheral portion of the impeller 5. The volute chamber flow path 22 has one end as the suction side and the other end as the discharge side, and is formed by substantially surrounding the outer periphery of the impeller 5. Note that the volute chamber 20 is open, and when the impeller 5 is accommodated in the volute chamber 20, one main surface of the impeller 5 is in an exposed state. For this reason, as shown in FIG. 1, a pump casing cover 4 is attached to one side of the pump casing 3 so as to cover the impeller 5.

[0019] As shown in Figure 4, the impeller 5 rotates, thereby imparting energy to the liquid. Furthermore, as described above, the impeller 5 is connected to the rotating shaft 10 of the motor 2. In other words, the impeller 5 rotates using the motor 2 as its driving source. The rotation of the impeller 5 agitates the liquid in the vortex chamber 20, pressurizing it and discharging it into the gas-liquid separation chamber 21. The discharged water is then expelled from the outlet 18 outside the pump.

[0020] As shown in Figures 1, 2, and 5, the fan cover 7 rotatably encloses the cooling fan 6. The fan cover 7 has multiple intake ports 7a on the surface facing the cooling fan 6 (the other side in the direction of the rotation axis). The fan cover 7 has a gap 7b between it and the side of the motor 2. The cooling fan 6 is fixed to a rotating shaft 10 protruding from the motor 2, and the fan cover 7 is fixed to the motor 2 so as to cover the cooling fan 6, forming an air passage for the cooling fan 6. When the cooling fan 6 rotates, air from outside the fan cover 7 flows into the fan cover 7 through the intake ports 7a. Some of the air that flows into the fan cover 7 flows along the side of the motor 2 through the gap 7b between the fan cover 7 and the motor 2.

[0021] Next, the characteristic features of this embodiment will be described based on Figures 1 to 7.

[0022] The vortex pump 1 of this embodiment includes a cooling fan 6 and a fan cover 7, as shown in Figure 5. In this case, as shown in Figure 6, the motor frame 8 has a first opening 13 with a number of holes arranged horizontally on the cooling fan 6 side of the motor 2, and a second opening 14 with a number of holes arranged horizontally. On the lower surface of the motor 2 facing the floor, there is a third opening 15, which is a passage that also serves as a drain hole. Specifically, below the rotation axis 10 on the surface of the motor 2 facing the cooling fan 6, there are concentric circles around the rotation axis 10. The numerous holes are arranged in two rows, with a first opening 13 in the inner row closer to the center and a second opening 14 in the outer row further from the center.

[0023] In this configuration, the cooling function of the motor 2 is performed by the cooling fan 6. Figure 5 is a cross-sectional view of the vortex pump 1. When the vortex pump 1 is in operation, the cooling fan 6 rotates counterclockwise when viewed from the front (Y4) (see Figure 2). Due to the rotation of the cooling fan 6, air is drawn in from the intake port 7a of the fan cover 7 and pressurized by the cooling fan 6. The airflow between the cooling fan 6 and the motor frame 8 flows in one direction, counterclockwise when viewed from the front of the vortex pump 1. On the other hand, since the first opening 13 and the second opening 14 form holes from the back to the front, the air pressurized by the cooling fan 6 flows into the motor 2 by passing through the first opening 13 and the second opening 14. A portion of the air that has flowed into the motor 2 flows out to the outside of the motor 2 through the third opening 15 (Y1, Y2, Y3). By pushing the hot air inside motor 2 out of motor 2, a circulating flow is formed, and the exchange of hot air for cold air has the effect of cooling motor 2. Y1 is the direction of air inflow from the first opening, Y2 is the direction of air inflow from the second opening, and Y3 is the direction of air outflow from the third opening.

[0024] Furthermore, air that has been pressurized by the cooling fan 6 but has not flowed into the motor 2 flows towards the side of the motor 2 through the gap 7b between the fan cover 7 and the side of the motor 2. The heat generated inside the motor 2 is transferred to the side of the motor frame 8 by thermal conduction, and this heat is cooled by the air pressurized by the cooling fan 6, thus providing a cooling effect.

[0025] Therefore, when the amount of air flowing along the side of motor 2 is the same, the amount of air circulating into or out of motor 2 affects the cooling effect of motor 2.

[0026] Figure 6 shows the motor frame 8 of the vortex pump 1, with the cooling fan 6 and fan cover 7 not shown, viewed from the lower rear side. Figure 7 is a cross-sectional view showing the hole shapes of the first opening 13 and the second opening 14 at that time. As shown in Figure 6, the rear surface of the motor frame 8 has multiple first openings 13 and second openings 14.

[0027] In this case, the entire circumference of the edges on the outer side of the motor 2 (the outer surface side of the motor frame 8) of the holes in the first opening 13 and the second opening 14 is rounded (corner radius). In other words, the inner surface of the hole in the first opening 13 and the outer surface of the motor frame 8, which is the outer casing of the motor 2, are connected by a curved surface that is convex toward the cooling fan, and the inner surface of the hole in the second opening 14 and the outer surface of the motor frame 8, which is the outer casing of the motor 2, are connected by a curved surface that is convex toward the cooling fan. The curved surface is rounded (corner radius).

[0028] As shown in Figure 7, when the edges of each first opening 13 and each second opening 14 are rounded (corner radius), the air is drawn inward towards the opening by the rounded edge (corner radius) on the upstream side when viewed from the rotation direction of the cooling fan 6. The air that flows into the motor 2 circulates inside and is discharged outside the motor 2 through the third opening 15.

[0029] In this case, the amount of air circulating inside the motor 2 can be increased compared to when there is no rounded corner (R), and a greater cooling effect is achieved by providing rounded corners (R). In this case, as shown in Figure 6, the plate thickness 16 of the motor frame is almost uniform on all surfaces of the motor frame 8.

[0030] Furthermore, when rounded corners (R) are provided around the entire circumference of the first opening 13 and the second opening 14, if the radius of the rounded corners (R) is equal to the thickness 16 of the motor frame, the amount of air circulating inside the motor 2 increases compared to when the radius of the rounded corners (R) is half the thickness 16 of the motor frame. The larger the radius of the rounded corners (R), the better the cooling performance can be achieved.

[0031] (Embodiment 2) Figure 8 shows the cooling fan 6 and fan cover 7 of the vortex pump 1, as viewed from the lower rear of the motor frame 8 (not shown). Figure 9 is a cross-sectional view showing the hole shapes of the first opening 13a and the second opening 14a at that time. Components similar to those in Embodiment 1 are given the same reference numerals, and their detailed descriptions are omitted. As shown in Figure 9, the difference from Embodiment 1 is the hole shapes of the first opening 13a and the second opening 14a.

[0032] In this case, a rounded edge (radius corner) is provided on a portion of the outer edge of the motor 2 (outer surface of the motor frame 8) in the holes of the first opening 13a and the second opening 14a. The rounded edge (radius corner) is provided only on the upstream (rear) half in the direction of rotation of the cooling fan 6, while the remaining half of the edge remains perpendicular to the surface and has a corner. In other words, in the hole of the first opening 13a, the inner surface of the semicircular portion of the hole on the upstream side in the direction of rotation of the cooling fan 6 and the outer surface of the motor frame 8, which is the outer casing of the motor 2, are connected by a curved surface with a convex shape toward the cooling fan 6, and in the hole of the second opening 14a, the inner surface of the semicircular portion of the hole on the upstream side in the direction of rotation of the cooling fan 6 and the outer surface of the motor frame 8, which is the outer casing of the motor 2, are connected by a curved surface with a convex shape toward the cooling fan 6. The curved surface is the rounded edge (radius corner).

[0033] If the edges of the holes in the first opening 13a and the second opening 14a are rounded (corner radius) only on the upstream (rear) half in the direction of rotation of the cooling fan 6, the rounded (corner radius) on the upstream side, as viewed from the direction of rotation of the cooling fan 6, draws air into the holes. Furthermore, some of the air collides with the surface that maintains a right angle and then flows into the motor 2 along the air drawn in by the aforementioned rounded (corner radius). In this case, the amount of air circulating inside the motor 2 can be increased compared to when the entire circumference of the first opening is rounded (corner radius), thereby improving the cooling performance of the motor. Note that when the vortex pump 1 is operated, the cooling fan 6 rotates clockwise when viewed from the fan cover side (rear) (see Figure 2).

[0034] Furthermore, the size of the rounded edges (corner radius) provided on the outer surface of the motor 2, specifically the edges of the first opening 13a and the second opening 14a, may be set to the maximum size that does not change the diameter of the holes on the inside of the motor 2, relative to the plate thickness 16 of the motor frame in which the first opening 13a and the second opening 14a are provided. This increases the amount of air flowing into the motor 2, further enhancing the cooling effect of the cooling fan 6 on the motor 2.

[0035] (Embodiment 3) Figure 10 shows the cooling fan 6 and fan cover 7 of the vortex pump 1, as viewed from the lower rear of the motor frame 8 (not shown). Figure 11 is a cross-sectional view showing the hole shapes of the first opening 13b and the second opening 14b at that time. Components similar to those in Embodiment 1 are given the same reference numerals, and their detailed descriptions are omitted. As shown in Figure 11, the difference from Embodiment 1 is the hole shapes of the first opening 13b and the second opening 14b.

[0036] In this case, the rounded (R-shaped) edges of the holes in the first opening 13b and the second opening 14b on the outer side of the motor 2 (the outer surface side of the motor frame 8) are provided only on the upstream (rear) half in the direction of rotation of the cooling fan 6. In addition, the edges of the holes in the first opening 13b and the second opening 14b on the inner side of the motor 2 (the inner surface side of the motor frame 8) may also be similarly rounded (R-shaped). In other words, the inner surface of the semicircular portion of the hole in the first opening 13b on the upstream side in the direction of rotation of the cooling fan 6 is connected to the outer surface of the motor frame 8, which is the outer casing of the motor 2, by a convex curved surface toward the cooling fan 6, and the inner surface of the semicircular portion of the hole in the first opening 13b on the downstream side in the direction of rotation of the cooling fan 6 is connected to the inner surface of the motor frame 8, which is the outer casing of the motor 2, by a convex curved surface toward the inside of the motor 2. Furthermore, a cooling fan 6 is located in the hole of the second opening 14b. The inner surface of the semicircular hole on the upstream side in the rotational direction of the motor 6 and the outer surface of the motor frame 8, which is the outer casing of the motor 2, are connected by a convex curved surface toward the cooling fan 6 side. At the hole of the second opening 14b, the inner surface of the semicircular hole on the downstream side in the rotational direction of the cooling fan 6 and the inner surface of the motor frame 8, which is the outer casing of the motor 2, are connected by a convex curved surface toward the inward side of the motor 2. The curved surface is rounded (corner radius).

[0037] This increases the amount of air flowing into the motor 2, further enhancing the cooling effect of the cooling fan 6 on the motor 2. When the vortex pump 1 is in operation, the cooling fan 6 rotates clockwise when viewed from the fan cover side (rear) (see Figure 2).

[0038] At this time, the rounded edge (corner radius) on the upstream side when viewed from the direction of rotation of the cooling fan 6 draws air inward towards the hole. Furthermore, some of the air collides with the rounded edge (corner radius) on the downstream side when viewed from the direction of rotation of the cooling fan 6, while maintaining its direction of flow, and then flows into the motor 2 along with the air drawn in by the aforementioned rounded edge (corner radius). At this time, the amount of air circulating inside the motor 2 increases compared to the amount of air circulating by providing a rounded edge (corner radius) around the entire circumference of the edge of the first opening, thereby improving the cooling performance of the motor 2.

[0039] A vortex pump according to one aspect of the present invention has a cooling fan, the fan rotates clockwise when viewed from the back of the vortex pump, and a motor is located opposite the cooling fan. The motor has a first opening on the side facing the cooling fan that serves as an air vent, and a second opening on the side of the motor facing the floor that serves both as an air vent and a drain hole.

[0040] Although the vortex pump according to the present invention has been described above based on embodiments, the present invention is not limited to these embodiments. Within the scope of the present invention, various modifications that a person skilled in the art could conceive of are applied to these embodiments, as well as configurations constructed by combining components from different embodiments, are also included without departing from the spirit of the present invention. [Industrial applicability]

[0041] The shape of the air vents in the motor according to the present invention suppresses the temperature rise of the vortex pump, and is expected to improve the pump output. [Explanation of Symbols]

[0042] 1. Vortex pump 2 motors 3. Pump casing 4 Pump casing cover 5 Impellers 6 Cooling fan 7 Fan Cover 7a Inlet 7b Gap 8 Motor Frames 9 Terminal cover 10 Rotation axis 11 rotors 12 staters 13. First opening 13a 1st opening 13b 1st opening 14. Second opening 14a Second opening 14b 2nd opening 15. Third opening 16. Thickness of the motor frame 17 Inlet 18 Outlet 19 Suction channel 20 vortex chamber 21 Gas-liquid separation chamber 22 Vortex chamber flow path 101 Vortex pump 102 Pump Casing 105 Motor 106 Cooling Fan 107 Fan Cover 108 First opening 109 Second opening 110 Third opening

Claims

1. A motor with two shafts, where the rotating shafts extend laterally, An impeller is provided on the rotating shaft on one side of the motor, A pump casing that rotatably houses the impeller and has a discharge port formed therein for discharging the liquid sucked in by the rotation of the impeller, A cooling fan is provided on the other side of the rotating shaft of the motor, The system comprises a fan cover that rotatably houses the cooling fan and has an air intake formed therein for drawing in air as the cooling fan rotates, The lower surface of the outer casing of the motor has a communication passage that connects the inside and outside of the outer casing of the motor, The outer casing of the motor is provided with a plurality of cylindrical holes on the surface facing the cooling fan, which communicate the inside and outside of the outer casing of the motor. A vortex pump characterized in that the entire circumference of the outer edge of the outer surface of the motor's outer casing in the aforementioned hole is rounded.

2. A motor with two shafts, where the rotating shafts extend laterally, An impeller is provided on the rotating shaft on one side of the motor, A pump casing that rotatably houses the impeller and has a discharge port formed therein for discharging the liquid sucked in by the rotation of the impeller, A cooling fan is provided on the other side of the rotating shaft of the motor, The system comprises a fan cover that rotatably houses the cooling fan and has an air intake formed therein for drawing in air as the cooling fan rotates, The lower surface of the outer casing of the motor has a communication passage that connects the inside and outside of the outer casing of the motor, The outer casing of the motor is provided with a plurality of cylindrical holes on the surface facing the cooling fan, which communicate the inside and outside of the outer casing of the motor. A vortex pump characterized in that the edge of the hole on the outer surface side of the motor enclosure of the semicircular portion of the hole on the upstream side in the rotation direction of the cooling fan is rounded.

3. The vortex pump according to claim 2, characterized in that the edge of the hole on the inner surface side of the outer casing of the motor of the semicircular portion downstream in the rotation direction of the cooling fan is rounded.

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