JP2021060031A - Submerged pump - Google Patents

Abstract

To provide a submerged pump capable of preventing (suppressing) the inhibition of rotations of an impeller with deposits when the deposits contact with the impeller.SOLUTION: A submerged pump 100 is equipped with a metallic pump casing 3, a metallic impeller 5 that is fixed to one end 1a of a rotary shaft 1, and is disposed in a pump chamber 3a in the inside of the pump casing 3, and an adhesion preventive electrode 6 that is installed near the impeller 5, is formed by a metallic material nobler than a metallic material forming the impeller 5 and a metallic material forming the pump casing 3, and prevents the adhesion of deposits to the impeller 5 and the pump casing 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a submersible pump.

Conventionally, a submersible pump provided with an anticorrosive electrode that suppresses corrosion of the rotating shaft is known (see, for example, Patent Document 1).

Patent Document 1 includes an impeller, a metal housing (pump casing), and an anticorrosion electrode formed of a metal material (a metal material having a high ionization tendency) that is lower than the metal material forming the housing. Submersible pumps are disclosed.

Japanese Unexamined Patent Publication No. 2000-310194

Although not specified in Patent Document 1, when the submersible pump is used at a tunnel work site or the like, deposits may adhere to the surfaces of the housing (pump casing) and the impeller. For example, calcium carbonate deposits are known to adhere to the surfaces of housings and impellers. In such a case, there is a problem that deposits gradually accumulate on the surfaces of the housing and the impeller, and the impellers come into contact with the deposited deposits to hinder the rotation of the impeller. It should be noted that if the deposits hinder the rotation of the impeller, the pump efficiency is lowered, which is not preferable. It is considered that the submersible pump described in Patent Document 1 has the same problem.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is that the rotation of the impeller is hindered by the deposits due to the contact of the deposits with the impeller. It is to provide a submersible pump capable of preventing (suppressing).

As a result of diligent studies by the inventor of the present application in order to solve the above problems, a submersible pump having an anticorrosion electrode formed of a metal material that is lower than the impeller and the pump casing is compared with a submersible pump that does not have an anticorrosion electrode. It has been found that deposits are particularly likely to adhere to the impeller and the pump casing, and that deposits do not adhere (difficult to adhere) to the anticorrosion electrode, which is a configuration on the corroding side. That is, the submersible pump is provided with an anti-adhesion electrode formed of a metal material that is nobler than the impeller and the pump casing, and the impeller and the pump casing are on the side that actively corrodes the impeller and the pump casing. We obtained the finding that the adhesion of deposits to the casing can be effectively prevented (suppressed), and we came up with the present invention by paying attention to this finding. Therefore, the submersible pump according to one aspect of the present invention has a metal pump casing, a metal impeller fixed to one end of the rotating shaft and arranged in the pump chamber inside the pump casing, and the vicinity of the impeller. It is made of a metal material that is installed in the impeller and a metal material that is nobler than the metal material that forms the pump casing, and is used as an adhesion prevention electrode to prevent adhesion of deposits to the impeller and pump casing. To be equipped.

In the submersible pump according to one aspect of the present invention, as described above, the submersible pump is formed of a metal material forming the impeller and a metal material nobler than the metal material forming the pump casing, and deposits on the impeller and the pump casing. An adhesion prevention electrode is provided to prevent adhesion of the metal. Thereby, the magnitude relationship of the ionization tendency between the impeller and the pump casing and the adhesion prevention electrode can be reversed from the magnitude relationship of the ionization tendency between the conventional pump casing and the anticorrosion electrode. That is, the impeller and the pump casing can be on the side that actively corrodes. Therefore, it is possible to prevent (suppress) deposits from adhering to the impeller and the pump casing. As a result, it is possible to prevent (suppress) the rotation of the impeller from being hindered by the deposits due to the deposits coming into contact with (or sticking to) the impeller. As a result, it is possible to prevent (suppress) a decrease in pump efficiency.

In the submersible pump according to the above one aspect, the adhesion prevention electrode is preferably arranged in the vicinity of the impeller and in the pump chamber inside the pump casing or outside the pump casing. With this configuration, when the adhesion prevention electrode is placed in the pump chamber inside the pump casing, the adhesion prevention electrode can be placed relatively close to the impeller, so that the deposits come into contact with the impeller. By (or adhering), it is possible to effectively prevent (suppress) the rotation of the impeller from being hindered by the adhering matter. Further, when the adhesion prevention electrode is arranged on the outside of the pump casing, the adhesion prevention electrode can be easily replaced (attachment work and removal work).

In the submersible pump according to the above one aspect, the adhesion prevention electrode is preferably provided in the vicinity of the suction port to the pump chamber inside the pump casing. With this configuration, it is possible to effectively prevent (suppress) deposits from adhering to the impeller and the pump casing in the vicinity of the suction port.

In this case, preferably, the pump casing includes a pump casing main body in which the pump chamber is provided inside, and a cover member having a suction port and installed in the pump casing main body, and the adhesion prevention electrode is provided in the pump chamber. It is located on the side opposite to the facing surface of the cover member facing the impeller on the inside, and is installed on the outer surface located on the outside of the pump chamber. Here, it is considered that the impediment to the rotation of the impeller due to the deposits is caused by the deposits adhering to the facing surface (between the impeller and the cover member). Therefore, with the above configuration, the adhesion prevention electrode can be arranged relatively close to the facing surface, so that it is possible to effectively prevent (suppress) the adhesion of deposits on the facing surface. .. Therefore, it is possible to effectively prevent (suppress) the rotation of the impeller from being hindered by the deposits adhering to the facing surface coming into contact with the impeller.

In a configuration in which the pump casing includes a pump casing main body and a cover member installed on the pump casing main body, preferably, a cover member fixing member for fixing the cover member to the pump casing main body is further provided, and the adhesion prevention electrode is provided. It is fixed to the pump casing main body together with the cover member by the fixing member for the cover member. With this configuration, the adhesion prevention electrode can be fixed by the existing cover member fixing member without providing a dedicated configuration for fixing the adhesion prevention electrode. That is, it is possible to prevent the device configuration from becoming complicated.

In a configuration in which the pump casing includes a pump casing main body and a cover member installed on the pump casing main body, the adhesion prevention electrode is preferably an annular plate-shaped member surrounding the suction port. With this configuration, the adhesion prevention electrodes can be arranged relatively close to the facing surface over a wider range of the facing surface, so that deposits can be more effectively prevented from adhering to the facing surface ( Can be suppressed). Therefore, it is possible to effectively prevent (suppress) the rotation of the impeller from being hindered by the deposits adhering to the facing surface coming into contact with the impeller.

In the submersible pump according to the above one aspect, preferably, the impeller has a plate-shaped portion extending in a direction intersecting the axial direction of the rotating shaft and a blade portion protruding from the plate-shaped portion toward the suction port side to the pump chamber. Including, the adhesion prevention electrode is installed inside the pump chamber on the other surface of the plate-shaped portion opposite to one surface on the blade portion side. With this configuration, the adhesion prevention electrode can be directly installed on the impeller surrounded by the pump casing, so that it is possible to effectively prevent (suppress) the adhesion of deposits to the impeller and the pump casing. Can be done.

In the submersible pump according to the above one aspect, the adhesion prevention electrode is preferably an impeller fixing member for fixing the impeller to one end of the rotating shaft. With this configuration, the impeller fixing member, which is an existing configuration for fixing the impeller to the rotating shaft, can be used as the adhesion prevention electrode. Therefore, a dedicated configuration is provided as the adhesion prevention electrode. Compared with the case, the number of parts can be reduced. As a result, it is possible to prevent the device configuration from becoming complicated.

In this case, the adhesion prevention electrode is preferably a bag nut that fixes the impeller to one end of the rotating shaft by sandwiching the impeller with the rotating shaft. With this configuration, it is possible to prevent (suppress) deposits from adhering to the impeller and pump casing simply by changing the material of the bag nut, which is an existing configuration.

In the submersible pump according to the above one aspect, the adhesion prevention electrode is preferably installed on the side of the pump casing outside the pump chamber via a mounting member attached to the submersible pump main body. With this configuration, the adhesion prevention electrode can be attached to the submersible pump body by the mounting member on the outside of the submersible pump body, so that the adhesion prevention electrode replacement work (mounting work and removal work) can be easily performed. It can be carried out.

In the submersible pump according to the above one aspect, preferably, the pump casing is made of iron or aluminum, and the adhesion prevention electrode is made of copper. With this configuration, deposits adhere to the pump casing by the adhesion prevention electrode formed of copper, which is a metal material (metal material with low ionization tendency) that is more precious than the pump casing made of iron or aluminum. Can be prevented (suppressed).

In the submersible pump according to the above one aspect, preferably, a water level detecting unit for detecting the water level in the area where the submersible pump main body is installed is further provided, and the submersible state of the pump casing is maintained based on the detection result of the water level detecting unit. It is configured in. Here, when the submerged state of the pump casing is maintained, the water containing the deposits adheres to the surface of the pump casing and is not exposed on the water surface to dry, so that the deposits adhere to the pump casing. It is thought to be suppressed. Therefore, with the above configuration, the water level detection unit can maintain the submerged state of the pump casing and effectively suppress the adhesion of deposits to the pump casing.

According to the present invention, as described above, it is possible to prevent (suppress) the rotation of the impeller from being hindered by the deposits due to the contact of the deposits with the impeller.

It is the schematic which showed the whole structure of the submersible pump by 1st Embodiment. It is an arrow view along the line 900-900 of FIG. It is the schematic which showed the whole structure of the submersible pump by 2nd Embodiment. It is an enlarged view which showed the electrode for preventing adhesion of the submersible pump according to 3rd Embodiment. It is an enlarged view which showed the electrode for preventing adhesion of the submersible pump according to 4th Embodiment. It is an enlarged view of the part A of FIG. It is the schematic which showed the whole structure of the submersible pump by 5th Embodiment. It is the schematic which showed the whole structure of the submersible pump by the modification.

Hereinafter, embodiments will be described with reference to the drawings.

[First Embodiment]
(Submersible pump configuration)
The submersible pump 100 of the first embodiment will be described with reference to FIGS. 1 and 2. The submersible pump 100 is a vertical submersible electric pump in which the rotating shaft 1 extends in the vertical direction (Z direction). In each figure, the axial direction of the rotating shaft 1 is indicated by the Z direction, the direction from the impeller 5 side to the motor 2 side is defined as the Z1 direction, and the opposite direction of the Z1 direction is indicated by the Z2 direction.

The submersible pump 100 includes a rotary shaft 1, a motor 2, a pump casing 3, an impeller 5, an adhesion prevention electrode 6, and a water level detection unit 7.

Here, in general, in a submersible pump used at a site where tunnel extension work is performed, deposits adhere (deposit) on the surface with time of use, and the amount of deposits gradually adheres (deposits). It is known that the amount of deposit) increases. As a specific example, it is known that calcium carbonate adheres to the impeller and pump casing of a submersible pump. When adhesion of deposits to the impeller and pump casing progresses, the deposits may hinder the rotation of the impeller arranged in the pump chamber inside the pump casing, resulting in a decrease in pump efficiency. Therefore, the submersible pump 100 of the first embodiment is provided with an adhesion prevention electrode 6 in order to prevent adhesion of deposits to the impeller 5 and the pump casing 3.

The rotating shaft 1 generally has a cylindrical shape extending in the vertical direction (Z direction). The impeller 5 is fixed to one end 1a (lower end) of the rotating shaft 1, and the motor 2 (rotor 21) is fixed to the other end 1b (upper end) side.

The rotating shaft 1 is provided with a fitting portion 10 at one end 1a on which the impeller 5 is installed by fitting. The fitting portion 10 is formed so that the diameter (outer diameter) is slightly smaller than the diameter (outer diameter) of the portion above the fitting portion 10. Further, the upper end of the fitting portion 10 is provided with a contact surface 11 that restricts the upward movement of the impeller 5 fitted in the fitting portion 10 by contact. The contact surface 11 functions as positioning of the impeller 5 in the vertical direction (axial direction of the rotating shaft 1). The impeller 5 is fixed to one end 1a of the rotating shaft 1 by the fixing member B1 in a state where the impeller 5 is fitted to the fitting portion 10 and is in contact with the contact surface 11 from below.

The motor 2 is configured to rotationally drive the rotating shaft 1. The motor 2 is configured to rotationally drive the impeller 5 via the rotating shaft 1. Specifically, the motor 2 includes a stator 20 having a coil and a rotor 21 arranged on the inner peripheral side of the stator 20. A rotation shaft 1 is fixed to the rotor 21. The motor 2 is configured to rotationally drive the rotating shaft 1 together with the rotor 21 by generating a magnetic field with the stator 20.

The pump casing 3 is made of metal. Specifically, the pump casing 3 is made of iron (including an alloy containing iron as a main component). A pump chamber 3a is provided inside the pump casing 3. Above the pump chamber 3a, an oil chamber 8 in which the mechanical seal 80 and the oil lifter 81 are arranged is provided. A strainer stand 30 is installed below the pump casing 3. The pump casing 3 includes a pump casing main body 3b in which a pump chamber 3a is provided inside, and a suction cover 4 having a suction port 4a and installed in the pump casing main body 3b. The suction cover 4 is an example of a "cover member" in the claims.

The suction cover 4 is configured to be installed from below with respect to the pump casing 3. The suction cover 4 has a circular outer edge shape when viewed from the axial direction (Z direction) of the rotating shaft 1 (see FIG. 2). The suction cover 4 has a recess 40 recessed upward on the inner peripheral side (rotational shaft 1 side). Further, the suction cover 4 has a suction port 4a for the pump chamber 3a. The suction port 4a is a through hole having a circular shape in a plan view. The suction port 4a is arranged directly below the rotating shaft 1 and the impeller 5.

Further, the submersible pump 100 includes a suction cover bolt 6a for fixing the suction cover 4 to the pump casing main body 3b. The suction cover bolt 6a is an example of a "fixing member for a cover member" within the scope of the claims.

As shown in FIG. 2, the suction cover bolt 6a is configured to be installed from below on the outer surface 4c described later. The suction cover bolt 6a is arranged on the outer peripheral side of the recess 40 when viewed from the axial direction (Z direction) of the rotating shaft 1. A plurality (four) of suction cover bolts 6a are provided at equal angular intervals so as to surround the suction port 4a (rotating shaft 1). The suction cover 4 is provided with an adhesion prevention electrode 6 by a suction cover bolt 6a. Details will be described later.

As shown in FIG. 1, the impeller 5 is fixed to one end 1a of the rotating shaft 1 and is arranged in the pump chamber 3a inside the pump casing 3. The impeller 5 includes a plate-shaped portion 50 (shroud) and a blade portion 51 (vane). The plate-shaped portion 50 extends in the horizontal direction intersecting the axial direction of the rotating shaft 1. The plate-shaped portion 50 has a disk shape. The blade portion 51 projects from the plate-shaped portion 50 to the suction port 4a side (lower side) to the pump chamber 3a.

The impeller 5 is made of metal. Specifically, the impeller 5 is formed of iron (including an alloy containing iron as a main component). As a more specific example, the impeller 5 is made of ductile cast iron (Ferrum Casting Ductile), high chrome cast iron, or the like.

The adhesion prevention electrode 6 is an elongated plate-shaped member. A plurality (4) of the adhesion prevention electrodes 6 are provided (see FIG. 2). The adhesion prevention electrode 6 is arranged near the impeller 5 and outside the pump casing 3. Further, the adhesion prevention electrode 6 is provided in the vicinity of the suction port 4a to the pump chamber 3a inside the pump casing 3.

Specifically, the adhesion prevention electrode 6 is located inside the pump chamber 3a on the opposite side of the facing surface 4b (upper surface of the suction cover 4) facing the impeller 5 of the suction cover 4, and the pump chamber 3a. It is installed on the outer surface 4c (lower surface of the suction cover 4) located on the outside of the suction cover 4. The adhesion prevention electrode 6 is fixed to the pump casing main body 3b together with the suction cover 4 by a suction cover bolt 6a. That is, the adhesion prevention electrode 6 is fixed to the pump casing body 3b by the suction cover bolt 6a so as to sandwich the suction cover 4 between the adhesion prevention electrode 6 and the pump casing body 3b. There is.

As shown in FIG. 2, the adhesion prevention electrode 6 is arranged so that the longitudinal direction substantially coincides with the radial direction of the rotation axis 1. The inner peripheral side end 61 of the adhesion prevention electrode 6 is located on the outer peripheral side of the suction port 4a, which does not overlap with the suction port 4a when viewed from the axial direction (Z direction) of the rotating shaft 1, and is at the suction port. It is arranged in the vicinity of 4a. The inner peripheral side end portion 61 is arranged at a position overlapping the recess 40 when viewed from the axial direction (Z direction) of the rotating shaft 1. The outer peripheral side end portion 62 of the adhesion prevention electrode 6 is arranged in the vicinity of the outer peripheral side end portion of the suction cover 4 when viewed from the axial direction (Z direction) of the rotating shaft 1. Further, the adhesion prevention electrode 6 is arranged below the recess 40 (outside the recess 40) (see FIG. 1).

The adhesion prevention electrode 6 shown in FIG. 1 is formed of a metal material (a metal material having a low ionization tendency) which is more precious than the metal material forming the pump casing 3 and the impeller 5. That is, the adhesion prevention electrode 6 is formed of a metal material that is noble than iron (including an alloy containing iron as a main component). Specifically, the adhesion prevention electrode 6 is made of copper (including an alloy containing copper as a main component).

Here, when two metal materials having different ionization tendencies are placed close to each other in water, deposits are positively attached to the metal material having a low ionization tendency, while deposits are attached to the metal material having a high ionization tendency. Does not adhere (difficult to adhere). Therefore, the pump casing 3 and the impeller 5 can be prevented from adhering by the adhesion prevention electrode 6. That is, the submersible pump 100 is configured to be able to prevent the pump casing 3 and the impeller 5 from being corroded by setting the pump casing 3 and the impeller 5 to the side that actively corrodes by the adhesion prevention electrode 6. ing.

The water level detection unit 7 is a float type water level detection unit 7. The water level detection unit 7 is configured to detect the water level in the area R where the submersible pump main body 9 is installed. The submersible pump 100 is configured to maintain the submerged state of the pump casing 3 based on the detection result of the water level detection unit 7.

Specifically, the water level detection unit 7 includes a first float 70 and a second float 71 arranged below the first float 70. The second float 71 is arranged above the upper end of the pump casing 3. Further, the second float 71 is arranged near the upper end of the pump casing 3 in the vertical direction (Z direction).

The first float 70 has a function of starting the submersible pump 100. That is, as the water level in the region R rises, the first float 70 moves upward and a predetermined pump starting water level is detected. Then, the submersible pump 100 starts based on the detection of the pump starting water level of the first float 70.

The second float 71 has a function of stopping the submersible pump 100. That is, as the water level in the region R drops, the second float 71 moves downward and a predetermined pump stop water level is detected. Then, the submersible pump 100 stops based on the detection of the pump stop water level of the second float 71. The submersible pump 100 is configured to stop after a predetermined time has elapsed from the detection of the pump stop water level. As an example, the submersible pump 100 is configured to stop 10 seconds after the detection of the pump stop water level.

(Effect of the first embodiment)
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the metal material forming the impeller 5 and the metal material forming the pump casing 3 are more noble than the metal material, and the deposits on the impeller 5 and the pump casing 3 are formed. An adhesion prevention electrode 6 is provided to prevent adhesion. Thereby, the magnitude relationship of the ionization tendency between the impeller 5 and the pump casing 3 and the adhesion prevention electrode 6 can be reversed from the magnitude relationship of the ionization tendency between the conventional pump casing 3 and the anticorrosion electrode. That is, the impeller 5 and the pump casing 3 can be on the side that actively corrodes. Therefore, it is possible to prevent (suppress) the deposits from adhering to the impeller 5 and the pump casing 3. As a result, it is possible to prevent (suppress) the rotation of the impeller 5 from being hindered by the deposits due to the deposits coming into contact with (or adhering to) the impeller 5. As a result, it is possible to prevent (suppress) a decrease in pump efficiency.

In the first embodiment, as described above, the adhesion prevention electrode 6 is arranged in the vicinity of the impeller 5 and outside the pump casing 3. Thereby, the replacement work (attachment work and removal work) of the adhesion prevention electrode 6 can be easily performed.

In the first embodiment, as described above, the adhesion prevention electrode 6 is provided in the vicinity of the suction port 4a to the pump chamber 3a inside the pump casing 3. As a result, it is possible to effectively prevent (suppress) deposits from adhering to the impeller 5 and the pump casing 3 in the vicinity of the suction port 4a.

In the first embodiment, as described above, the pump casing 3 has a pump casing main body 3b in which the pump chamber 3a is provided inside, and a suction cover 4 having a suction port 4a and installed in the pump casing main body 3b. The adhesion prevention electrode 6 is located inside the pump chamber 3a on the opposite side of the facing surface 4b facing the impeller 5 of the suction cover 4, and is located on the outer surface 4c located outside the pump chamber 3a. is set up. Here, it is considered that the impediment to the rotation of the impeller due to the deposits is caused by the deposits adhering to the facing surface 4b (between the impeller 5 and the suction cover 4). Therefore, by configuring as described above, the adhesion prevention electrode 6 can be arranged relatively close to the facing surface 4b, so that the adhesion prevention electrode 6 can be effectively prevented (suppressed) from adhering to the facing surface 4b. can do. Therefore, it is possible to effectively prevent (suppress) the rotation of the impeller 5 from being hindered by the deposits adhering to the facing surface 4b coming into contact with the impeller 5.

In the first embodiment, as described above, the suction cover bolt 6a for fixing the suction cover 4 to the pump casing main body 3b is further provided, and the adhesion prevention electrode 6 is pumped together with the suction cover 4 by the suction cover bolt 6a. It is fixed to the casing body 3b. As a result, the adhesion prevention electrode 6 can be fixed by the suction cover bolt 6a, which is an existing configuration, without providing a dedicated configuration for fixing the adhesion prevention electrode 6. That is, it is possible to prevent the device configuration from becoming complicated.

In the first embodiment, as described above, the pump casing 3 is made of iron or aluminum, and the adhesion prevention electrode 6 is made of copper. As a result, deposits adhere to the pump casing 3 by the adhesion prevention electrode 6 formed of copper, which is a metal material (metal material having a lower ionization tendency) that is more precious than the pump casing 3 made of iron or aluminum. Can be prevented (suppressed).

In the first embodiment, as described above, the water level detecting unit 7 for detecting the water level in the area R where the submersible pump main body 9 is installed is further provided, and the pump casing 3 is submerged based on the detection result of the water level detecting unit 7. Is configured to hold. Here, when the submerged state of the pump casing 3 is maintained, the water containing the deposits adheres to the surface of the pump casing 3 and is not exposed on the water surface to dry, so that the deposits on the pump casing 3 are not dried. It is considered that the adhesion of the casing is suppressed. Therefore, with the above configuration, the water level detection unit 7 can maintain the submerged state of the pump casing 3 and effectively suppress the adhesion of deposits to the pump casing 3.

[Second Embodiment]
The second embodiment will be described with reference to FIG. In the second embodiment, unlike the first embodiment in which the adhesion prevention electrode 6 is arranged below the recess 40 of the suction cover 4 (outside the recess 40), the adhesion prevention electrode 206 is the suction cover 4 An example of arranging the inside of the recess 40 of the above will be described. In the figure, the same reference numerals are given to the parts having the same configuration as that of the first embodiment.

The submersible pump 200 of the second embodiment includes an adhesion prevention electrode 206.

The adhesion prevention electrode 206 is arranged inside a recess 40 recessed above the suction cover 4. Specifically, the adhesion prevention electrode 206 is arranged at the bottom portion on the upper side of the recess 40. The adhesion prevention electrode 206 is an annular plate-shaped member that surrounds the suction port 4a. The adhesion prevention electrode 206 is fixed to the suction cover 4 by a bolt B2. The bolt B2 is a dedicated bolt for fixing the adhesion prevention electrode 206 to the suction cover 4.

The thickness of the rotation shaft 1 of the adhesion prevention electrode 206 in the axial direction (Z direction) is smaller than the thickness of the portion of the suction cover 4 where the adhesion prevention electrode 206 is installed. As an example, the thickness of the adhesion prevention electrode 206 is about half the thickness of the suction cover 4.

The suction cover 4 is fixed to the pump casing 3 by a suction cover bolt B3. Unlike the first embodiment, the suction cover bolt B3 is a bolt for fixing only the suction cover 4. The same applies to the subsequent embodiments.

(Effect of the second embodiment)
In the second embodiment, the following effects can be obtained.

In the second embodiment, by configuring as described above, the rotation of the impeller 5 is hindered by the deposits due to the adhesion (or adhesion) to the impeller 5 as in the first embodiment. Can be prevented (suppressed).

In the second embodiment, as described above, the adhesion prevention electrode 206 is an annular plate-shaped member surrounding the suction port 4a. As a result, the adhesion prevention electrode 206 can be arranged relatively close to the facing surface 4b over a wider range of the facing surface 4b, so that deposits can be more effectively prevented from adhering to the facing surface 4b ( Can be suppressed). Therefore, it is possible to more effectively prevent (suppress) the deposits from hindering the rotation of the impeller 5 due to the deposits adhering to the facing surface 4b coming into contact with the impeller 5.

[Third Embodiment]
A third embodiment will be described with reference to FIG. In this third embodiment, unlike the first embodiment in which the adhesion prevention electrode 6 is installed on the suction cover 4, an example in which the adhesion prevention electrode 306 is installed on the rotating shaft 1 will be described. In the figure, the same reference numerals are given to the parts having the same configuration as that of the first embodiment.

The submersible pump 300 of the third embodiment includes an adhesion prevention electrode 306.

The adhesion prevention electrode 306 is an impeller fixing member that fixes the impeller 5 to one end 1a of the rotating shaft 1. Specifically, the adhesion prevention electrode 306 is a bag nut that fixes the impeller 5 to one end 1a of the rotating shaft 1 by sandwiching the impeller 5 with the rotating shaft 1 (contact surface 11). The adhesion prevention electrode 306 is arranged in the vicinity of the impeller 5 and in the pump chamber 3a inside the pump casing 3. The adhesion prevention electrode 306 is screwed onto one end 1a (lower end) of the rotating shaft 1.

(Effect of Third Embodiment)
In the third embodiment, the following effects can be obtained.

In the third embodiment, by configuring as described above, the rotation of the impeller 5 is hindered by the deposits due to the adhesion (or adhesion) to the impeller 5 as in the first embodiment. Can be prevented (suppressed).

In the third embodiment, as described above, the adhesion prevention electrode 306 is arranged in the vicinity of the impeller 5 and in the pump chamber 3a inside the pump casing 3. As a result, the adhesion prevention electrode 306 can be arranged relatively close to the impeller 5, so that the deposits contact (or adhere) to the impeller 5, and the rotation of the impeller 5 is hindered by the deposits. Can be effectively prevented (suppressed).

In the third embodiment, as described above, the adhesion prevention electrode 306 is an impeller fixing member that fixes the impeller 5 to one end 1a of the rotating shaft 1. As a result, the impeller fixing member, which is an existing configuration for fixing the impeller 5 to the rotating shaft 1, can be used as the adhesion prevention electrode 306. Therefore, a dedicated configuration is provided as the adhesion prevention electrode 306. Compared with the case, the number of parts can be reduced. As a result, it is possible to prevent the device configuration from becoming complicated.

In the third embodiment, as described above, the adhesion prevention electrode 306 is a bag nut that fixes the impeller 5 to one end 1a of the rotating shaft 1 by sandwiching the impeller 5 between the impeller 5 and the rotating shaft 1. .. As a result, it is possible to prevent (suppress) deposits from adhering to the impeller 5 and the pump casing 3 simply by changing the material of the bag nut, which is an existing configuration.

[Fourth Embodiment]
A fourth embodiment will be described with reference to FIGS. 5 and 6. In the fourth embodiment, unlike the first embodiment in which the adhesion prevention electrode 6 is provided on the suction cover 4, an example in which the adhesion prevention electrode 406 is installed on the impeller 5 will be described. In the figure, the same reference numerals are given to the parts having the same configuration as that of the first embodiment.

As shown in FIG. 5, the submersible pump 400 of the fourth embodiment includes an adhesion prevention electrode 406.

Here, as described in the first embodiment, the impeller 5 has a plate-shaped portion 50 extending in a direction intersecting the axial direction of the rotating shaft 1, and a suction port 4a from the plate-shaped portion 50 to the pump chamber 3a. It includes a blade portion 51 projecting to the side. The adhesion prevention electrode 406 is installed inside the pump chamber 3a on the other surface 50b of the plate-shaped portion 50 on the side opposite to the one surface 50a on the blade portion 51 side. The adhesion prevention electrode 406 is formed in a ring shape surrounding the rotation shaft 1. The adhesion prevention electrode 406 is installed so as to come into contact with the entire (omitted) surface of the other surface 50b.

As shown in FIG. 6, the adhesion prevention electrode 406 is installed (fixed) on the plate-shaped portion 50 by a plurality of countersunk screws B4 attached from above. The countersunk screw B4 is attached to the adhesion prevention electrode 406 and the plate-shaped portion 50 so as not to protrude upward from the upper surface 406a of the adhesion prevention electrode 406. That is, the countersunk screw B4 is arranged on the Z2 direction side of the upper surface 406a of the adhesion prevention electrode 406.

As shown in FIG. 5, the gap (vertical gap) between the upper surface 406a of the adhesion prevention electrode 406 and the pump casing 3 is the gap (vertical gap) between the blade portion 51 and the suction cover 4. It is set large enough compared to. In this case, between the upper surface 406a of the adhesion prevention electrode 406 and the pump casing 3, even if the deposit adheres to the upper surface 406a, the deposit does not hinder the rotation of the impeller 5. A gap (relatively large gap) is required.

(Effect of Fourth Embodiment)
In the fourth embodiment, the following effects can be obtained.

In the fourth embodiment, by configuring as described above, the rotation of the impeller 5 is hindered by the deposits due to the adhesion (or adhesion) to the impeller 5 as in the first embodiment. Can be prevented (suppressed).

In the fourth embodiment, as described above, the impeller 5 has a plate-shaped portion 50 extending in a direction intersecting the axial direction of the rotating shaft 1 and protruding from the plate-shaped portion 50 toward the suction port 4a to the pump chamber 3a. The adhesion prevention electrode 406 is installed on the other surface 50b of the plate-shaped portion 50 on the side opposite to the one surface 50a on the blade portion 51 side inside the pump chamber 3a, including the blade portion 51. As a result, the adhesion prevention electrode 406 can be directly installed on the impeller 5 surrounded by the pump casing 3, so that the adhesion prevention electrode 406 can be effectively prevented (suppressed) from adhering to the impeller 5 and the pump casing 3. be able to.

[Fifth Embodiment]
A fifth embodiment will be described with reference to FIG. 7. In the fifth embodiment, unlike the first embodiment in which the adhesion prevention electrode 6 is arranged below the pump casing 3, an example in which the adhesion prevention electrode 506 is arranged on the side of the pump casing 3 will be described. In the figure, the same reference numerals are given to the parts having the same configuration as that of the first embodiment.

The submersible pump 500 of the fifth embodiment includes an adhesion prevention electrode 506.

The adhesion prevention electrode 506 is arranged near the impeller 5 and outside the pump casing 3. The adhesion prevention electrode 506 is installed on the side of the pump casing 3 outside the pump chamber 3a via a mounting member 506a attached to the submersible pump main body 9. That is, the adhesion prevention electrode 506 is arranged at a position where at least a part of the adhesion prevention electrode 506 overlaps with the pump casing 3 in the vertical direction (axial direction of the rotation axis).

(Effect of the fifth embodiment)
In the fifth embodiment, the following effects can be obtained.

In the fifth embodiment, by configuring as described above, the rotation of the impeller 5 is hindered by the deposits due to the adhesion (or adhesion) to the impeller 5 as in the first embodiment. Can be prevented (suppressed).

In the fifth embodiment, as described above, the adhesion prevention electrode 506 is installed on the side of the pump casing 3 outside the pump chamber 3a via the mounting member 506a attached to the submersible pump main body 9. As a result, the adhesion prevention electrode 506 can be attached to the submersible pump body 9 by the attachment member 506a on the outside of the submersible pump body 9, so that the adhesion prevention electrode 506 can be easily replaced (attachment work and removal work). Can be done.

(Modification example)
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the first and second embodiments, the adhesion prevention electrode is installed on the outer surface (lower surface) of the suction cover, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode 606 may be installed on the facing surface 4b (upper surface) of the suction cover 4, as in the modified submersible pump 600 shown in FIG. The adhesion prevention electrode 606 is installed (fixed) on the suction cover 4 by a plurality of countersunk screws B4a attached from above. In this case, there is a predetermined gap (relatively large gap) between the blade portion 51 and the adhesion prevention electrode 606 so that the deposit does not hinder the rotation of the impeller 5 even if the deposit adheres. )is required. Even if the deposits adhere to the adhesion prevention electrode 606, there is no problem as long as the adhesion amount is such that it can be peeled off by the contact of the impeller 5.

Further, in the first to fifth embodiments, an example in which the adhesion prevention electrode is made of copper is shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be formed of a metal material other than copper, such as silver or lead, as long as it is a metal material nobler than the impeller and the pump casing. However, from the viewpoint of suppressing the corrosion of the impeller and the pump casing to a small extent, the ionization tendency of the adhesion prevention electrode is preferably close to the ionization tendency of the impeller and the pump casing.

Further, in the first to fifth embodiments, an example in which the pump casing is formed of iron is shown, but the present invention is not limited to this. In the present invention, the pump casing may be formed of a metal material other than iron, such as aluminum, as long as it is a metal material that is lower than the adhesion prevention electrode. However, from the viewpoint of suppressing the corrosion of the pump casing to a small extent, it is preferable that the ionization tendency of the pump casing is close to the ionization tendency of the adhesion prevention electrode.

Further, in the first to fifth embodiments, an example in which the impeller is formed of iron (ductile cast iron, high chrome cast iron, etc.) is shown, but the present invention is not limited to this. In the present invention, the impeller may be formed of a metal material other than iron as long as it is a metal material that is lower than the adhesion prevention electrode. However, from the viewpoint of suppressing the corrosion of the impeller, it is preferable that the ionization tendency of the impeller is close to the ionization tendency of the adhesion prevention electrode. The impeller may be either a metal material of the same quality as the pump casing or a metal material of a different quality.

Further, in the first to fifth embodiments, an example in which the water level detection unit is a float type water level detection unit is shown, but the present invention is not limited to this. In the present invention, the water level detection unit may be a water level detection unit of a different type such as an electrode type water level detection unit.

Further, in the first to fifth embodiments, an example in which the pump casing includes a suction cover is shown, but the present invention is not limited to this. In the present invention, the pump casing may not include the suction cover, and the pump casing main body may have a suction port. In this case, the adhesion prevention electrode may be installed directly on the pump casing main body.

Further, in the first to fifth embodiments, an example in which the submersible pump is a vertical submersible electric pump is shown, but the present invention is not limited to this. In the present invention, the submersible pump may be a horizontal submersible electric pump.

Further, in the first embodiment, an example in which the submersible pump is provided with a plurality of adhesion prevention electrodes is shown, but the present invention is not limited to this. In the present invention, the submersible pump may include one adhesion prevention electrode. In this case, one adhesion prevention electrode may be an annular plate-shaped member surrounding the suction port.

Further, in the second to fifth embodiments, the example in which the submersible pump is provided with one adhesion prevention electrode is shown, but the present invention is not limited to this. In the present invention, the submersible pump may be provided with a plurality of adhesion prevention electrodes.

Further, in the second and fourth embodiments, an example in which the adhesion prevention electrode is formed in a ring shape is shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be formed in a semicircular shape or a rectangular shape.

Further, in the second embodiment, the thickness of the rotation axis of the adhesion prevention electrode in the axial direction is smaller than the thickness of the portion where the adhesion prevention electrode of the suction cover is installed. Although an example in which the thickness is composed of about half the thickness of the suction cover is shown, the present invention is not limited to this. In the present invention, the axial thickness of the rotation axis of the adhesion prevention electrode may be thicker than the thickness of the portion where the adhesion prevention electrode of the suction cover is installed, or the thickness of the adhesion prevention electrode may be suctioned. It may be configured to be smaller than about half the thickness of the cover.

Further, in the fourth embodiment, an example in which the adhesion prevention electrode is fixed to the suction cover by a countersunk screw is shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be fixed to the suction cover by adhesion or the like.

Further, in the third embodiment, an example in which the impeller is fixed to the rotating shaft by a bag nut which is an adhesion prevention electrode is shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be formed of bolts, and the impeller may be fixed to the rotating shaft by the adhesion prevention electrode bolts.

1 Rotating shaft 1a One end 3 Pump casing 3a Pump chamber 3b Pump casing body 4 Suction cover (cover member)
4a Suction port 4b Facing surface 4c Outer surface 5 Impeller 6, 206, 306, 406, 506, 606 Adhesion prevention electrode 6a Suction cover bolt (fixing member for cover member)
7 Water level detector 9 Submersible pump body 50 Plate-shaped part 50a One side 50b The other side 51 Blade part 100, 200, 300, 400, 500, 600 Submersible pump 506a Mounting member R area

Claims (12)

With a metal pump casing,
A metal impeller fixed to one end of the rotating shaft and placed in the pump chamber inside the pump casing.
It is installed in the vicinity of the impeller and is formed of a metal material that is nobler than the metal material that forms the impeller and the metal material that forms the pump casing, and adheres to the impeller and the pump casing. Submersible pump with anti-adhesion electrodes to prevent. The submersible pump according to claim 1, wherein the adhesion prevention electrode is arranged in the vicinity of the impeller and outside the pump chamber or the pump casing inside the pump casing. The submersible pump according to claim 1 or 2, wherein the adhesion prevention electrode is provided in the vicinity of a suction port to the pump chamber inside the pump casing. The pump casing includes a pump casing main body in which the pump chamber is provided inside, and a cover member having the suction port and installed in the pump casing main body.
The adhesion prevention electrode is located inside the pump chamber on the side opposite to the facing surface of the cover member facing the impeller, and is installed on an outer surface located outside the pump chamber. , The submersible pump according to claim 3. A cover member fixing member for fixing the cover member to the pump casing main body is further provided.
The submersible pump according to claim 4, wherein the adhesion prevention electrode is fixed to the pump casing main body together with the cover member by the cover member fixing member. The submersible pump according to claim 4 or 5, wherein the adhesion prevention electrode is an annular plate-shaped member surrounding the suction port. The impeller includes a plate-shaped portion extending in a direction intersecting the axial direction of the rotating shaft, and a blade portion protruding from the plate-shaped portion toward a suction port side to the pump chamber.
The invention according to any one of claims 1 to 6, wherein the adhesion prevention electrode is installed inside the pump chamber on the other surface of the plate-shaped portion opposite to one surface on the blade portion side. Submersible pump. The submersible pump according to any one of claims 1 to 7, wherein the adhesion prevention electrode is an impeller fixing member for fixing the impeller to the one end of the rotating shaft. The submersible pump according to claim 8, wherein the adhesion prevention electrode is a bag nut that fixes the impeller to the one end of the rotating shaft by sandwiching the impeller with the rotating shaft. The one according to any one of claims 1 to 9, wherein the adhesion prevention electrode is installed on the side of the pump casing outside the pump chamber via a mounting member attached to the submersible pump main body. underwater pump. The pump casing is made of iron or aluminum
The submersible pump according to any one of claims 1 to 10, wherein the adhesion prevention electrode is made of copper. It also has a water level detector that detects the water level in the area where the submersible pump body is installed.
The submersible pump according to any one of claims 1 to 11, which is configured to maintain the submerged state of the pump casing based on the detection result of the water level detection unit.

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