KR102667469B1 - Submersible pump capable of enforcing corrosion protective ability - Google Patents

Abstract

The present invention includes a pump housing 10 with a built-in drive motor, an impeller 20 installed on the lower side of the pump housing 10 and rotated by the drive motor, and an impeller (20) coupled to the bottom of the pump housing 10. 20) relates to a submersible pump including a pump chamber (30) through which the fluid pumped by the pump passes, and a suction pipe (40) coupled to the lower end of the pump chamber (30) to guide the fluid to the pump chamber (30). ) is detachably fastened to the bottom of the pump chamber 30 by a bolt (not shown) and is connected to the outlet pipe portion 41 having an inner diameter that narrows toward the bottom, and the lower end of the outlet pipe portion 41. An inlet pipe portion 42 having an inner diameter that gradually widens toward the lower side, a stepped inner peripheral surface 43 formed on the inner peripheral surface of the outlet pipe portion 41 and stepped from the upper end of the inlet pipe portion 42, and a stepped inner peripheral surface 43. It has a shape that engages and is characterized by including a corrosion-prevention sleeve 44 made of stainless steel.

Description

Submersible pump capable of enforcing corrosion protective ability}

The present invention relates to a submersible pump, and more specifically, to a submersible pump with an enhanced anti-corrosion function that can prevent corrosion in the suction pipe even when operated for a long period of time.

Figure 1 is a diagram to explain corrosion of the suction pipe in a submersible pump.

In general, submersible pumps are installed individually or built into a column in a storage space such as a sewage treatment plant or pumping station, and are used to pump water to the outside. Submersible pumps are implemented in various sizes depending on the displacement, and basically consist of a pump housing with a built-in drive motor, an impeller rotated by the drive motor, a pump chamber through which the fluid pumped by the impeller passes by coupled to the bottom of the pump housing, and a fluid pump. It consists of a suction pipe that guides to the pump room.

On the other hand, when the submersible pump is operated and the suction water level is lower than the specified water level, air is sucked in during the operation process, resulting in cavitation phenomenon. For example, when there is no or little water sucked at the dry or low water level, the water sucked by the impeller contains excessive air, causing cavitation around the suction pipe. In this case, the inner peripheral surface of the suction pipe is excessively corroded due to contact with oxygen in the air.

If the suction pipe is excessively corroded, water cannot be guided to the actual pump, which drastically reduces pumping efficiency. As a result, the suction pipe must be replaced on a regular or irregular basis. Normally, when the suction pipe is about 5 years old, it becomes corroded and eroded by cavitation and needs to be replaced.

However, in order to replace the suction pipe, the submersible pump had to be completely separated from the installation space and moved to the ground. Then, after replacing the suction pipe, the submersible pump was moved to the installation space and then reinstalled. This process took at least a week, and a lot of replacement costs were incurred during this process.

Additionally, because submersible pumps are a product produced in small quantities and with a variety of products, the specifications vary from company to company. Therefore, when it is time to replace the suction pipe several years after installing the submersible pump, it is generally not easy to supply suction pipe parts. Therefore, in order to replace the suction pipe, the suction pipe had to be custom-produced, and this process generally requires more time and cost.

Additionally, since the submersible pump cannot be used while the suction pipe is being replaced, damage to life and property may occur if heavy rain occurs and flooding occurs while the suction pipe is being replaced. In particular, in a reality where abnormal weather phenomena are becoming common and heavy rains and frequent typhoons are repeated, there is a problem that if the operation of the submersible pump is stopped for a long time due to the replacement of the suction pipe, the possibility of major damage increases.

The present invention was created to solve the above problems, and can delay corrosion in the suction pipe even if the suction water level is lower than the specified water level or operated for a long period of time. Accordingly, the suction pipe replacement cycle is increased to prevent pump operation from stopping. The purpose is to provide a submersible pump with enhanced anti-corrosion function that can minimize maintenance costs as well as the possibility of flooding.

In order to achieve the above object, the submersible pump with enhanced corrosion prevention function according to the present invention includes a pump housing 10 with a built-in drive motor, and is installed on the lower side of the pump housing 10 and connected to the drive motor. An impeller 20 rotated by an impeller 20 is coupled to the bottom of the pump housing 10 and a pump chamber 30 through which the fluid pumped by the impeller 20 passes, and a pump chamber 30 is coupled to the bottom of the pump chamber 30 to pump fluid. In the submersible pump including a suction pipe 40 that guides to the pump chamber 30, the suction pipe 40 is detachably fastened to the bottom of the pump chamber 30 by a bolt (not shown) and is directed to the lower side. An outlet pipe portion (41) having an inner diameter that narrows as the water flows, an inlet pipe portion (42) connected to the lower end of the outlet pipe portion (41) and having an inner diameter that widens toward the lower side, and the outlet pipe portion (41). It is formed on the inner peripheral surface and includes a stepped inner peripheral surface 43 formed to be stepped with the upper end of the inlet pipe portion 42, and a corrosion prevention sleeve 44 made of stainless steel and having a shape engaged with the stepped inner peripheral surface 43. It is characterized by

In the present invention, a ring-shaped stepped outlet holder (41b) connected to the upper end of the stepped inner peripheral surface (43) is formed on the inner upper side of the outlet pipe portion (41), and the anti-corrosion sleeve (44) is It includes a sleeve body (44a) engaged with the stepped inner peripheral surface (43), and a sleeve mounting rim (44b) extending radially from the top of the sleeve body (44a) and mounted on the outlet mounting end (41b). do.

In the present invention, a plurality of mounting end screw grooves (41c) are formed in a circular orbit at the outlet mounting end (41b), and a mounting end opposing the mounting end screw groove (41c) is formed on the sleeve mounting rim (44b). A rim hole 44c is formed.

In the present invention, a plurality of mounting end position alignment grooves (41d) are formed on the outlet mounting end (41b) outside the mounting end screw groove (41c), and the mounting hole is located at the bottom of the sleeve mounting rim (44b). A mounting protrusion 44d is formed to be inserted into the mounting end position alignment groove 41d to align the position of the mounting end screw groove 41c so that (44c) and the mounting end screw groove 41c are exactly opposite to each other.

In the present invention, a ring-shaped sleeve fitting groove (42a) is formed at the stepped upper end of the inlet pipe portion (42) into which the lower end of the sleeve body (44a) is inserted, and the outer surface of the sleeve fitting groove (42a) is formed. A fitting groove inclined end (42b) is formed that is inclined toward the outlet pipe portion (41).

According to the present invention, the suction pipe 40 coupled to the lower end of the pump chamber 30 includes an outlet pipe portion 41 having an inner diameter that narrows toward the lower side, and an inlet pipe portion 42 having an inner diameter that becomes wider toward the lower side. and a stepped inner peripheral surface 43 formed on the inner peripheral surface of the outlet pipe portion 41 and stepped with the upper end of the inlet pipe portion 42, and a corrosion-resistant sleeve made of stainless steel that is shaped to engage with the stepped inner peripheral peripheral surface 43. By including 44), for example, even if a lot of air is contained in the fluid sucked by the impeller 20 at low water level or low water and a cavitation phenomenon occurs around the suction pipe 40, the suction pipe (20) is protected by the corrosion prevention sleeve 44. It is possible to prevent corrosion from occurring in the suction pipe (40), thereby preventing corrosion or erosion of the suction pipe (40), thereby increasing the replacement cycle of the suction pipe (40), minimizing the stoppage of operation of the submersible pump, and increasing the service life. .

1 is a diagram to explain the corrosion of the suction pipe in a submersible pump;
Figure 2 is a cross-sectional view of a submersible pump with enhanced corrosion prevention function according to the present invention;
Figure 3 is a side view showing an excerpt of the suction pipe of Figure 2;
Figure 4 is an exploded view of the suction pipe of Figure 3;
Figure 5 is a view for explaining the sleeve fitting groove and fitting groove inclined edge for preventing vortex formation on the inner peripheral surface of the step constituting the suction pipe of Figure 3;

Hereinafter, a submersible pump with an enhanced corrosion prevention function according to the present invention will be described in detail with reference to the attached drawings.

Hereinafter, the term “above” or “above” may include not only what is directly above in contact but also what is above without contact. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. Terms are used only to distinguish one component from another. Singular expressions include plural expressions unless the context clearly dictates otherwise. Additionally, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary. Additionally, terms such as "...unit" and "module" used in the specification refer to a unit that processes at least one function or operation. Additionally, in the drawings, the sizes of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are shown arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is shown.

Figure 2 is a cross-sectional view of a submersible pump with an enhanced corrosion prevention function according to the present invention, Figure 3 is a side view showing an excerpt of the suction pipe of Figure 2, and Figure 4 is an exploded view of the suction pipe of Figure 3.

As shown, the submersible pump with enhanced corrosion prevention function according to the present invention includes a pump housing 10 with a built-in drive motor, and an impeller ( 20) and the pump chamber 30, which is coupled to the lower end of the pump housing 10 and through which the fluid (water) pumped by the impeller 20 passes, and is coupled to the lower end of the pump chamber 30 to transfer the fluid to the pump chamber 30. Includes a suction pipe 40 that guides.

In the present invention, fluid may be wastewater for treatment at a sewage treatment plant, water for treatment at a pumping plant, or rainwater for drainage from an underground space.

Since the pump housing 10, impeller 20, and pump chamber 30 that constitute the submersible pump 20 are general structures, further detailed description will be omitted.

The suction pipe 40 is detachably fastened to the bottom of the pump chamber 30 with a bolt (not shown), and includes an outlet pipe portion 41 having an inner diameter that narrows toward the bottom, and a lower end of the outlet pipe portion 41. An inlet pipe portion 42 having an inner diameter that widens toward the lower side as connected to the bottom, a stepped inner peripheral surface 43 formed on the inner peripheral surface of the outlet pipe portion 41 and stepped from the upper end of the inlet pipe portion 42, and a stepped inner peripheral surface 43. It has a shape that engages the inner peripheral surface 43 and includes a corrosion-prevention sleeve 44 made of stainless steel.

The outlet pipe portion 41 and the inlet pipe portion 42 are made of cast iron, for example, a material having GC200 specifications.

At the portion where the outlet pipe portion 41 and the inlet pipe portion 42 are connected, a step is formed at the upper end of the inlet pipe portion 42, so that a stepped inner peripheral surface 43 is naturally formed on the inner peripheral surface of the outlet pipe portion 41. In order to form such a stepped inner peripheral surface 43, it may be formed by manufacturing the outlet pipe portion 41 and the inlet pipe portion 42 as one body and then cutting the stepped inner peripheral surface 43. However, the inner and outer diameters of the joined portions are different from each other. It may also be implemented by manufacturing the pipe portion 41 and the inlet pipe portion 42 independently and combining them.

The anti-corrosion sleeve 44 is made of stainless steel, which has stronger erosion and corrosion strength than the outlet pipe portion 41 and the inlet pipe portion 42, and in this embodiment, is made of a material having SC313 specifications.

A ring-shaped stepped outlet holder (41b) connected to the upper end of the stepped inner peripheral surface (43) is formed inside the upper end of the outlet pipe portion (41).

The anti-corrosion sleeve 44 includes a sleeve body 44a that engages the stepped inner peripheral surface 43, extends radially at the top of the sleeve body 44a, and is mounted on the outlet mount end 41b. Includes rim 44b.

Due to this structure, when the anti-corrosion sleeve 44 is inserted into the outlet pipe portion 41, as shown in FIG. 4, the sleeve body 44a is engaged and adhered to the stepped inner peripheral surface 43, and the sleeve mounting frame 44b is By being seated on this outlet holder 41b, the anti-corrosion sleeve 44 and the outlet pipe portion 41 become one body.

In addition, a plurality of mounting end screw grooves (41c) are formed in a circular orbit at the outlet mounting end (41b), and a mounting hole (44c) opposing the mounting end screw groove (41c) is formed on the sleeve mounting rim (44b). do.

According to this structure, when a bolt (not shown) is screwed into the mounting end screw groove (41c) through the mounting hole (44c), the sleeve mounting rim (44b) is fixed to the outlet mounting end (41b), and the anti-corrosion sleeve (44) may be coupled to the outlet pipe (41). Accordingly, by preventing the anti-corrosion sleeve 44 from being vibrated by fluid pressure flowing into the suction pipe 40, noise generation due to vibration can be prevented.

In addition, a plurality of mounting end position alignment grooves (41d) are formed on the outlet mounting end (41b) outside the mounting end screw groove (41c), and a mounting hole (44c) and a mounting stage are formed at the bottom of the sleeve mounting rim (44b). In order to align the screw grooves (41c) so that they are exactly opposite each other, a mounting protrusion (44d) is formed to fit into the mounting stage alignment groove (41d).

Due to this structure, when the mounting protrusion (44d) is inserted into the mounting end position alignment groove (41d), the mounting hole (44c) and the mounting end screw groove (41c) are aligned exactly, making bolt fastening easy. You can do it.

FIG. 5 is a diagram illustrating a sleeve cover blade for preventing vortex formation on the stepped inner peripheral surface constituting the suction pipe of FIG. 3.

A ring-shaped sleeve fitting groove (42a) is formed at the stepped upper end of the inlet pipe portion (42) into which the lower end of the sleeve body (44a) is inserted, and the outer surface of the sleeve fitting groove (42a) moves toward the outlet pipe portion (41). An inclined fitting groove inclined end (42b) is formed.

With this structure, when the lower end of the sleeve body 44a is inserted into the sleeve fitting groove 42a, the inlet pipe portion 42 and the sleeve body 44a are connected at an angle. Accordingly, even if the fluid flows toward the inlet pipe portion 42 at a high speed, the lower end of the sleeve body 44a is caught in the sleeve fitting groove 42a and does not receive any fluid resistance. As a result, the sleeve body 44a is provided with a step. It can be maintained firmly in close contact with (43).

In addition, the generation of vortices can be fundamentally prevented by allowing fluid to flow smoothly around the sleeve fitting groove (42a) where a step is formed by the fitting inclined end (42b), thereby leading to smooth fluid flow.

As such, according to the present invention, the suction pipe 40 coupled to the lower end of the pump chamber 30 includes an outlet pipe portion 41 having an inner diameter that narrows toward the lower side, and an inlet pipe portion having an inner diameter that becomes wider toward the lower side. (42) and the stepped inner peripheral surface (43) formed on the inner peripheral surface of the outlet pipe portion (41) and stepped with the upper end of the inlet pipe portion (42), and the stepped inner peripheral peripheral surface (43), which is made of stainless steel and has a shape that engages corrosion. By including the prevention sleeve 44, for example, when the water level is low or low, the fluid sucked by the impeller 20 contains a lot of air and even if cavitation phenomenon occurs around the suction pipe 40, the corrosion prevention sleeve 44 is protected. This can prevent corrosion from occurring in the suction pipe (40). Accordingly, by preventing corrosion or erosion of the suction pipe (40), the replacement cycle of the suction pipe (40) can be increased to minimize the stoppage of operation of the submersible pump, and the service life can be increased. It can be increased.

In particular, by extending the replacement cycle of the suction pipe 40, the submersible pump can be operated continuously, so that potential damage can be prevented by appropriately responding to unexpected heavy rain and typhoons.

The present invention has been described with reference to an embodiment shown in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom.

10 ... pump housing 20 ... impeller
30 ... pump room 40 ... suction pipe
41 ... outlet pipe 41b ... outlet holder
41c... Mounting end screw groove 41d... Mounting end position alignment groove
42 ... inlet pipe 42a ... sleeve fitting groove
42b ... Fitting groove slope 43 ... If you give a step
44 ... anti-corrosion sleeve 44a ... sleeve body
44b ... sleeve mounting rim 44c ... mounting hole
44d ... crooked process

Claims (5)

A pump housing 10 with a built-in drive motor, an impeller 20 installed on the lower side of the pump housing 10 and rotated by the drive motor, and coupled to the bottom of the pump housing 10, the impeller ( In the submersible pump including a pump chamber (30) through which the fluid pumped by 20) passes, and a suction pipe (40) coupled to the lower end of the pump chamber (30) to guide the fluid to the pump chamber (30),
The suction pipe 40 is,
An outlet pipe portion 41 that is detachably fastened to the bottom of the pump chamber 30 by a bolt (not shown) and has an inner diameter that narrows toward the bottom and has a circular cross-section, and a lower end of the outlet pipe portion 41. It is connected to the inlet pipe portion 42, which has an inner diameter that widens toward the lower side and has a circular cross-section, and a stepped inner peripheral surface formed on the inner peripheral surface of the outlet pipe portion 41 and stepped from the upper end of the inlet pipe portion 42 ( 43) and a corrosion-prevention sleeve 44 made of stainless steel and having a shape engaged with the step inner peripheral surface 43;
A ring-shaped stepped outlet holder (41b) connected to the upper end of the stepped inner peripheral surface (43) is formed inside the upper end of the outlet pipe portion (41);
The anti-corrosion sleeve 44 includes a sleeve body 44a that engages the stepped inner peripheral surface 43, extends radially from the top of the sleeve body 44a, and is attached to the outlet holder end 41b. It includes a sleeve mounting frame (44b) that is mounted;
A plurality of mounting end screw grooves (41c) are formed in a circular orbit at the outlet mounting end (41b);
A submersible pump with an enhanced anti-corrosion function, characterized in that a mounting hole (44c) opposing the mounting end screw groove (41c) is formed in the sleeve mounting rim (44b). delete delete According to paragraph 1,
A plurality of mounting end position alignment grooves (41d) are formed on the outlet mounting end (41b) outside the mounting end screw groove (41c),
At the bottom of the sleeve mounting rim (44b), a mounting protrusion (44d) is inserted into the mounting end alignment groove (41d) to align the mounting hole (44c) so that the mounting screw groove (41c) is exactly opposed to the mounting hole (44c). A submersible pump with enhanced anti-corrosion function, characterized in that it is formed. According to paragraph 1,
A ring-shaped sleeve fitting groove (42a) is formed at the stepped upper end of the inlet pipe portion (42) into which the lower end of the sleeve body (44a) is inserted,
A submersible pump with an enhanced anti-corrosion function, characterized in that an inclined fitting groove (42b) is formed on the outer surface of the sleeve fitting groove (42a), which is inclined toward the outlet pipe part (41).

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