JPH04121492U - underwater pump - Google Patents

Abstract

(57) [Summary] [Purpose] Even light specific gravity foreign matter floating on the water surface is reliably sucked together with water (fluid) to prevent light specific gravity foreign matter from remaining on the water surface, and to remove foreign matter mixed in the fluid. The suction capacity of the pump is improved by making it possible to cut it into small pieces and suck it. [Structure] Upper part 13B of pump casing 2 housing impeller 3 attached to vertical pump main shaft 10
An upward suction port 9 is formed to guide the fluid to the impeller 3,
If necessary, a fixed blade 4 having passages 11, 11, . There is.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention reliably absorbs light specific gravity foreign objects floating on the water surface together with water (fluid). In addition to cutting foreign matter mixed into the fluid into small pieces, it can be sucked in. Regarding the submersible pump that also made it possible.

0002

[Conventional technology]

For submersible pumps, cut cloth and long string-like foreign objects mixed into the fluid into small pieces. There is a grinder pump that is designed to suck fluid together when it is disconnected. . Grinder pumps are mainly motor driven, as shown in Figures 2 and 3. pump casing 2, impeller 3, annular fixed blade 4, rotating blade 5, discharge pipe 6 and a supporting leg 7. An intermediate seat 8 is attached to the lower end of the motor frame 1. The pump casing 2 is attached to the suction port 9 of the pump casing 2. An annular fixed blade 4 is attached. Inside the motor frame 1, there is a motor ( (not shown) is housed in a watertight manner, and an impeller 3 is fixed to its output rotating shaft 10. ing. The impeller 3 is housed in the pump casing 2 and is attached to the shaft end of the impeller 3. The rotary blade 5, which rotates together with the impeller 3, rotates into the inner peripheral space of the annular fixed blade 4. They are fitted freely. The fixed blade 4 has an inlet 3A of the impeller 3 that supplies fluid to its inner circumference. A plurality of passages 11, 11... are formed to penetrate in the axial direction at equal intervals in the circumferential direction. , the counter-rotation direction of the rotary blade 5 at the boundary between each passage 11, 11... and the inner peripheral surface 4A A fixed blade portion 4B is formed on the side. The rotary blade 5 has equal intervals on its outer circumference in the circumferential direction. A plurality of (two in the illustrated example) rotary blade portions 5A, 5A extending in the axial direction are formed. Ru. Therefore, due to the rotation of the impeller 3, the inlet 3 passes through the passages 11, 11... If a piece of cloth or a long string-like foreign object is mixed into the fluid sucked into A, this foreign object After being cut short by the cutting action of the fixed blade part 4B and the rotary blade part 5A, the flow It is sucked into the impeller 3 along with the body through passages 11, 11..., and discharged from the discharge pipe 6. It will be served.

0003 However, in the conventional grinder pump, the suction port 9 is formed downward. ing. Therefore, if the water level is, for example, the lowest water level LWL of the water supply well 12 or its associated Even if the temperature drops to near the water, the distance from the water surface to the suction port 9 is long. Moreover, it floats on the water surface. As shown by arrow A, the light specific gravity foreign matter that is It does not reach the suction port 9 unless it goes through a detour where it sinks. Therefore, light specific gravity foreign matter It has the disadvantage that water remains without being absorbed together with water.

0004

[Problem that the idea aims to solve]

The problem we are trying to solve is that the water level is, for example, at or near the lowest water level in a water supply well. This is the point where light specific gravity foreign objects floating on the water surface remain even if the water level decreases to a certain level.

[0005]

[Means to solve the problem]

The invention of claim 1 includes an impeller attached to a pump main shaft having a vertical axis. , and a pump casing that rotatably accommodates this impeller. , an upward suction is provided in the upper part of the pump casing to direct fluid to the impeller. characterized by the formation of a mouth, and the water level is, for example, at or near the lowest water level of the water supply well. Make sure to suck up light specific gravity foreign objects floating on the water surface into the suction port before the water drops to around . The purpose of this system was to prevent light specific gravity foreign objects from floating and remaining on the water surface.

[0006] Further, the invention of claim 2 provides an axial direction for guiding fluid to the impeller through the upward suction port. A fixed blade having a passage formed therethrough is attached and rotates together with the impeller. The blade is rotatably fitted inside the fixed blade, and passes through the passage. Even if a piece of cloth or a long string-like foreign object is mixed into the fluid being sucked, this foreign object can be fixed. By cutting short with the cutting action of the blade and rotating blade, fluid and cut It also makes it possible to smoothly suck in foreign objects and improve the suction capacity of the pump. Ta.

[0007]

[Effect]

According to the invention of claim 1, since the suction port is formed upward, the suction can be taken in from the water surface. The distance to the mouth becomes shorter. Moreover, light specific gravity foreign objects floating on the water surface are Since the sea urchin can reach the inlet directly without going through a detour, the water level can be lowered. For example, before water drops to or near the lowest water level in a water supply well, light It can be sucked into the suction port along with the body.

[0008] Further, according to the invention of claim 2, the fluid sucked into the suction port may include a piece of cloth or a long Even if a string-like foreign object is mixed in, the foreign object can be removed by cutting by the cooperation of the fixed blade and the rotating blade. Since it can be cut into short lengths, the suction port is prevented from becoming clogged with foreign matter. Therefore This ensures a smooth flow of fluid and cut debris, increasing the suction capacity of the pump. It can also be improved.

[0009]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. Note that it is the same as the conventional example above. In other words, corresponding parts are given the same reference numerals, and detailed structural explanations are omitted. Shown in Figure 1 As shown in FIG. An intermediate casing 13 is interposed. This intermediate casing 13 has a peripheral wall. A plurality of windows 13A, 13A are formed, and the upper flange is connected to the motor frame 1. Fasten with a fastening member such as a bolt (not shown) to the lower flange of the By this, it is attached to the lower side of the motor frame 1, and the bottom part 13B is connected to the pump casing. It fits into the upper opening 2A of the tag 2 and is tightened with a fastening member such as a bolt (not shown). By tying it together, the pump casing 2 is attached to the lower side. In other words, the intermediate case The bottom part 13B of the ring 13 constitutes the upper part of the pump casing. pump casing The bottom part 13B of the intermediate casing 13, which functions as the upper part of the A suction port 9 is formed, and an annular fixed blade 4 is attached to this suction port 9. solid As shown in FIG. A plurality of passages 11, 11... leading to 3A are formed by penetrating in the axial direction at equal intervals in the circumferential direction. and counter-rotation of the rotary blade 5 at the boundary between each passage 11, 11... and the inner circumferential surface 4A. A fixed blade portion 4B is formed on the direction side. A rotating blade is attached to the top of the output rotating shaft 10 in Figure 1. 5 is set. As shown in FIG. A plurality of rotary blade portions 5A, 5A are formed extending in the axial direction. Therefore, the feather Due to the rotation of the root wheel 3, the flow passes through the passages 11, 11... and is sucked into the inlet 3A. If a piece of cloth or a long string-like foreign object is mixed into the body, this foreign object will be connected to the rotating fixed blade part 4B. After being cut short by the cutting action in cooperation with the blade portion 5A, the passage 11 is released along with the fluid. , 11... to be sucked into the impeller 3 in FIG. 1 and discharged from the discharge pipe 6. become.

0010 Further, inside the intermediate casing 13, a funnel-shaped guide member 14 is arranged around the output rotation shaft. (pump main shaft) 10 is rotatably inserted through the guide member 14 and the motor. A mechanical seal 15 is disposed between the bottoms of the frame 1 so that the motor frame 1 This prevents water from entering.

[0011] In this way, passages 11, 11 that penetrate in the axial direction are formed in the suction port 9 that is formed upward. In the configuration in which the fixed blade 4 with... is attached, the suction port 9, that is, the passage 1 is The distance to 1, 11... becomes shorter. Moreover, light specific gravity foreign objects floating on the water surface are , a plurality of holes formed in the intermediate casing 13 without going through a detour as in the conventional case. Passages 11, 11... can be directly reached through windows 13A, 13A. Therefore, before the water level drops to, for example, the lowest water level LWL of the water supply well or its vicinity, , light specific gravity foreign matter can be reliably sucked into the passages 11, 11... along with the fluid. Therefore, light specific gravity foreign objects will not remain floating on the water surface at the lowest water level LWL. . Also, the fluid passing through the passages 11, 11... and being sucked into the inlet 3A of the impeller 3 If a piece of cloth or a long string-like foreign object is mixed into the After being cut short by the cutting action in cooperation with the section 5A, the passage 11, 11..., is sucked into the impeller 3, and is discharged from the discharge pipe 6. Therefore, it is possible to prevent clogging of the suction port 9 due to foreign matter, that is, to prevent the passages 11, 11... This prevents clogging and allows smooth flow of fluid and cut foreign matter to ensure that the port is clean. This will improve the suction capacity of the pump.

0012 Further, the fluid flowing into the intermediate casing 13 from the plurality of windows 13A, 13A is The outer surface of the funnel-shaped guide member 14 rectifies the vortex flow with a constant rotation direction. The user is guided along the outer surface toward the passages 11, 11, . . . . The result As a result, the fluid is smoothly sucked into the passages 11, 11..., and the pump suction is reduced. It is possible to significantly improve the loading capacity.

[0013] In the embodiment described above, the annular fixed blade 4 is attached to the suction port 9, and the upper part of the output rotation shaft 10 is Although the explanation is based on a configuration in which a rotary blade 5 is provided, the fixed blade 4 and the rotary blade 5 are not necessarily provided. do not need. Even with this configuration, from the water surface to the suction port 9 formed upward. The distance between the directly upward from the plurality of windows 13A, 13A formed in the intermediate casing 13. It is possible to reach the suction port 9 in the direction. For this purpose, if the water level is low, e.g. Before the water level drops to or near the lowest water level LWL, remove light specific gravity foreign objects along with the fluid. The suction can be reliably sucked into the suction port 9.

[0014]

[Effect of the idea]

As explained above, the invention of claim 1 has the suction port facing upward. , the distance from the water surface to the suction port has become shorter, making it easier to remove light specific gravity foreign objects floating on the water surface than before. Because water can be sucked in directly without a detour, for example, Remove light specific gravity foreign objects along with the fluid before the water level drops to or near the minimum water level in the supply well. It can be sucked into the suction port reliably. Therefore, light specific gravity foreign matter floats on the water surface. It will not remain.

[0015] Furthermore, the invention of claim 2 can be applied even if a piece of cloth or a long string-like foreign object is mixed in the fluid. This foreign material can be cut short by the cutting action of the fixed blade and the rotating blade, so the foreign material can be cut short. This prevents objects from clogging the suction port, allowing smooth flow of fluid and cut foreign objects. This has the advantage of improving the suction capacity of the pump.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of an embodiment of the present invention.

FIG. 2 is a partially sectional front view of an example of a conventional grinder pump.

FIG. 3 is an enlarged bottom view showing the relationship between the fixed blade and the rotary blade.

[Explanation of symbols]

2 Pump casing 3 Impeller 4 Fixed blade 5 Rotary blade 9 Upward suction port 10 Output rotating shaft (pump main shaft) 11 Passage 13B Bottom of intermediate casing (top of pump casing)

Claims (2)

[Scope of utility model registration request] 1. A submersible pump comprising an impeller attached to a pump main shaft having a vertical axis, and a pump casing rotatably housing the impeller, in which a fluid is supplied to an upper part of the pump casing. A submersible pump characterized by having an upward suction port that leads to an impeller. 2. A fixed blade having an axially penetrating passage for guiding fluid to the impeller is attached to the upward suction port, and a rotary blade that rotates together with the impeller is rotatably fitted inside the fixed blade. Claim 1 characterized in that:
Submersible pump as described.