JP7302421B2 - underwater pump - Google Patents

Description

The present invention relates to submersible pumps.

Conventionally, there is known a submersible pump provided with anti-corrosion electrodes that suppress corrosion of a rotating shaft (see, for example, Patent Document 1).

The above Patent Document 1 includes an impeller, a metal housing (pump casing), and an anticorrosion electrode made of a metal material (a metal material with a high ionization tendency) that is less noble than the metal material forming the housing. A submersible pump is disclosed.

JP-A-2000-310194

Although not specified in the above Patent Document 1, when a 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 the deposits gradually accumulate on the surfaces of the housing and the impeller, and the impeller comes into contact with the deposited deposits, thereby hindering the rotation of the impeller. It should be noted that it is not preferable for the deposits to impede the rotation of the impeller because the efficiency of the pump will decrease. It is considered that the submersible pump described in Patent Document 1 also has the same problem.

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

As a result of intensive studies by the inventors of the present application to solve the above problems, a submersible pump provided with anticorrosion electrodes made of a metal material that is less noble than the impeller and the pump casing is superior to a submersible pump without anticorrosion electrodes. As a result, it was found that deposits are particularly likely to adhere to the impeller and the pump casing, and deposits do not adhere (hardly adhere) to the anticorrosive electrode, which is the structure on the corroding side. That is, by providing the submersible pump with an anti-adhesion electrode made of a metal material more noble than the impeller and the pump casing, and making the impeller and the pump casing on the positively corroding side, The inventors have obtained knowledge that it is possible to effectively prevent (suppress) the adhesion of substances to the surface, and have conceived the present invention by paying attention to this knowledge. Therefore, a submersible pump according to a first aspect of the present invention comprises a metal pump casing, a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing, and Adhesion prevention electrode installed in the vicinity and made of a metal material more noble than the metal material forming the impeller and the metal material forming the pump casing, for preventing the adhesion of contaminants to the impeller and the pump casing The pump casing includes a pump casing main body having a pump chamber provided therein, and a cover member having a suction port to the pump chamber and installed on the pump casing main body, and the adhesion prevention electrode includes a pump It is located on the opposite side of the surface of the cover member facing the impeller inside the chamber and is installed on the outer surface located outside the pump chamber.

In the submersible pump according to the first aspect of the present invention, as described above, the metal material forming the impeller and the metal material forming the pump casing are made of a nobler metal material, and attached to the impeller and the pump casing. Adhesion prevention electrodes are provided to prevent the adhesion of substances. As a result, the ionization tendencies between the impeller/pump casing and the anti-adhesion electrode can be reversed from the conventional ionization tendencies between the pump casing and the anti-corrosion electrode. That is, the impeller and pump casing can be made to be the aggressively corroding side. 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) impediment of rotation of the impeller due to contact (or adhesion) of the deposits to the impeller. As a result, it is possible to prevent (suppress) the deterioration of the pump efficiency. Here, it is considered that the impediment of rotation of the impeller due to the deposits is caused particularly by the deposits adhering to the facing surfaces (between the impeller and the cover member). Therefore, with the above configuration, the adhesion prevention electrode can be arranged relatively close to the opposing surface, so that the adhesion of the deposit to the opposing surface can be effectively prevented (suppressed). . Therefore, it is possible to effectively prevent (suppress) impediment of the rotation of the impeller due to contact of the deposit adhering to the opposing surface with the impeller.

The submersible pump according to the first aspect preferably further includes a cover member fixing member for fixing the cover member to the pump casing main body, and the adhesion prevention electrode is secured to the pump casing main body together with the cover member by the cover member fixing member. is fixed to According to this structure, the adhesion prevention electrode can be fixed by the cover member fixing member, which is an existing structure, without providing a special structure for fixing the adhesion prevention electrode. That is, it is possible to prevent the device configuration from becoming complicated.

In the submersible pump according to the first aspect , the anti-adhesion electrode is preferably an annular plate-like member surrounding the suction port. With this configuration, the adhesion prevention electrode can be arranged relatively close to the facing surface over a wider range of the facing surface, so that the adhesion of deposits to the facing surface can be more effectively prevented ( suppression). Therefore, it is possible to effectively prevent (suppress) impediment of the rotation of the impeller due to contact of the deposit adhering to the opposing surface with the impeller.

A submersible pump according to a second aspect of the present invention comprises a metal pump casing, a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing, and a an anti-adhesion electrode which is installed and made of a metal material that is nobler than the metal material forming the impeller and the metal material forming the pump casing, and for preventing the adhesion of contaminants to the impeller and the pump casing; The impeller includes a plate-shaped portion extending in a direction intersecting with the axial direction of the rotating shaft, and a blade portion projecting from the plate-shaped portion toward the suction port side of the pump chamber, and the adhesion prevention electrode is attached to the pump chamber. It is installed on the other side of the plate-like portion opposite to the one side on the blade portion side inside the plate-like portion.
In the submersible pump according to the second aspect of the present invention, as described above, the metal material forming the impeller and the metal material forming the pump casing are made of a nobler metal material, and attached to the impeller and the pump casing. Adhesion prevention electrodes are provided to prevent the adhesion of substances. As a result, as in the submersible pump according to the first aspect, it is possible to prevent (suppress) impediment of rotation of the impeller due to deposits coming into contact with (or adhering to) the impeller. . In addition, since the adhesion prevention electrode can be directly installed on the impeller surrounded by the pump casing, it is possible to effectively prevent (suppress) the adhesion of deposits to the impeller and the pump casing.

A submersible pump according to a third aspect of the present invention comprises a metal pump casing, a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing, and a an anti-adhesion electrode which is installed and made of a metal material that is nobler than the metal material forming the impeller and the metal material forming the pump casing, and for preventing the adhesion of contaminants to the impeller and the pump casing; The adhesion prevention electrode is an impeller fixing member that fixes the impeller to one end of the rotating shaft.
In the submersible pump according to the third aspect of the present invention, as described above, the metal material forming the impeller and the metal material forming the pump casing are made of a nobler metal material, and attached to the impeller and the pump casing. Adhesion prevention electrodes are provided to prevent the adhesion of substances. As a result, as in the submersible pump according to the first aspect, it is possible to prevent (suppress) impediment of rotation of the impeller due to deposits coming into contact with (or adhering to) the impeller. . In addition, since 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, compared to the case of providing a dedicated configuration as the adhesion prevention electrode. , the number of parts can be reduced. As a result, it is possible to prevent the device configuration from becoming complicated.

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

A submersible pump according to a fourth aspect of the present invention comprises a metal pump casing, a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing, and a an anti-adhesion electrode which is installed and made of a metal material that is nobler than the metal material forming the impeller and the metal material forming the pump casing, and for preventing the adhesion of contaminants to the impeller and the pump casing; The anti-adhesion electrode is installed on the side of the pump casing outside the pump chamber via an attachment member attached to the submersible pump main body.
In the submersible pump according to the fourth aspect of the present invention, as described above, the metal material forming the impeller and the metal material forming the pump casing are made of a nobler metal material, and attached to the impeller and the pump casing. Adhesion prevention electrodes are provided to prevent the adhesion of substances. As a result, as in the submersible pump according to the first aspect, it is possible to prevent (suppress) impediment of rotation of the impeller due to deposits coming into contact with (or adhering to) the impeller. . In addition, since the anti-adhesion electrode can be attached to the submersible pump body by means of the attachment member outside the submersible pump body, replacement work (attachment and removal work) of the anti-adhesion electrode can be easily performed.

A submersible pump according to a fifth aspect of the present invention comprises a metal pump casing, a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing, and a an anti-adhesion electrode which is installed and made of a metal material that is nobler than the metal material forming the impeller and the metal material forming the pump casing, and for preventing the adhesion of contaminants to the impeller and the pump casing; The pump casing is made of iron or aluminum, and the anti-adhesion electrode is made of copper.
In the submersible pump according to the fifth aspect of the present invention, as described above, the metal material forming the impeller and the metal material forming the pump casing are made of a nobler metal material, and attached to the impeller and the pump casing. Adhesion prevention electrodes are provided to prevent the adhesion of substances. As a result, as in the submersible pump according to the first aspect, it is possible to prevent (suppress) impediment of rotation of the impeller due to deposits coming into contact with (or adhering to) the impeller. . In addition, the adhesion prevention electrode made of copper, which is a more noble metal material (a metal material with a lower ionization tendency) than the pump casing made of iron or aluminum, prevents the adhesion of deposits to the pump casing ( suppression).

According to the present invention, as described above, it is possible to prevent (suppress) impediment of rotation of the impeller due to deposits coming into contact with the impeller.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which showed the whole structure of the submersible pump by 1st Embodiment. FIG. 2 is a view along line 900-900 of FIG. 1; It is the schematic which showed the whole structure of the submersible pump by 2nd Embodiment. It is the figure which expanded and showed the electrode for adhesion prevention of the submersible pump by 3rd Embodiment. It is the figure which expanded and showed the electrode for adhesion prevention of the submersible pump by 4th Embodiment. It is the figure which expanded the A section of FIG. It is a schematic diagram showing the whole structure of the submersible pump by a 5th embodiment. It is the schematic which showed the whole structure of the submersible pump by a modification.

Hereinafter, embodiments will be described based on the drawings.

[First embodiment]
(Configuration of submersible pump)
A submersible pump 100 of the first embodiment will be described with reference to FIGS. 1 and 2. FIG. The submersible pump 100 is a vertical submersible electric pump with a rotating shaft 1 extending 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 in the Z direction is indicated by the Z1 direction, and the opposite direction to 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 anti-adhesion electrode 6 , and a water level detector 7 .

Here, in general, submersible pumps used at sites where tunnel extension work is carried out are subject to deposits (accumulation) on the surface as they are used over time, and the amount of deposits ( is known to increase. As a specific example, it is known that calcium carbonate adheres to impellers and pump casings of submersible pumps. If the adhesion of deposits to the impeller and the 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 the anti-adhesion electrode 6 in order to prevent the adhering matter from adhering to the impeller 5 and the pump casing 3 .

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

The rotary shaft 1 is provided at one end 1a with a fitting portion 10 to which the impeller 5 is fitted. The fitting portion 10 is formed such that its 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 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 (the axial direction of the rotating shaft 1). The impeller 5 is fixed to one end 1a of the rotating shaft 1 by a fixing member B1 in a state where the impeller 5 is fitted in 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 coils and a rotor 21 arranged on the inner peripheral side of the stator 20 . The rotating shaft 1 is fixed to the rotor 21 . The motor 2 is configured to rotate 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 3 a is provided inside the pump casing 3 . An oil chamber 8 in which a mechanical seal 80 and an oil lifter 81 are arranged is provided above the pump chamber 3a. A strainer stand 30 is installed below the pump casing 3 . The pump casing 3 includes a pump casing main body 3b inside which a pump chamber 3a is provided, and a suction cover 4 having a suction port 4a and installed on the pump casing main body 3b. The suction cover 4 is an example of the "cover member" in the claims.

The suction cover 4 is configured to be installed on the pump casing 3 from below. 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 an upward recessed portion 40 on the inner peripheral side (rotating shaft 1 side). The suction cover 4 also has a suction port 4a leading to the pump chamber 3a. The suction port 4a is a through hole having a circular shape in plan view. The suction port 4 a is arranged directly below the rotating shaft 1 and the impeller 5 .

The submersible pump 100 also 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 the "cover member fixing member" in the scope of claims.

As shown in FIG. 2, the suction cover bolt 6a is configured to be installed from below on an outer surface 4c, which will be described later. The suction cover bolt 6 a 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 the suction cover bolts 6a are provided at equal angular intervals so as to surround the suction port 4a (rotating shaft 1). An adhesion prevention electrode 6 is installed on the suction cover 4 with a suction cover bolt 6a. Details will be described later.

As shown in FIG. 1 , the impeller 5 is fixed to one end 1 a of the rotary shaft 1 and arranged in the pump chamber 3 a inside the pump casing 3 . The impeller 5 includes a plate-like portion 50 (shroud) and blade portions 51 (vanes). The plate-like portion 50 extends in a horizontal direction that intersects with the axial direction of the rotating shaft 1 . The plate-like portion 50 has a disc shape. The blade portion 51 protrudes from the plate-like portion 50 toward the suction port 4a side (lower side) of the pump chamber 3a.

The impeller 5 is made of metal. Specifically, the impeller 5 is made 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-chromium cast iron, or the like.

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

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

As shown in FIG. 2 , the anti-adhesion electrode 6 is arranged such that its longitudinal direction substantially coincides with the radial direction of the rotating shaft 1 . The inner peripheral side end portion 61 of the adhesion prevention electrode 6 is located at a position on the outer peripheral side of the suction port 4a that does not overlap with the suction port 4a when viewed from the axial direction (Z direction) of the rotating shaft 1, and 4a. The inner peripheral side end portion 61 is arranged at a position overlapping the concave portion 40 when viewed from the axial direction (Z direction) of the rotating shaft 1 . The outer peripheral end portion 62 of the adhesion prevention electrode 6 is arranged in the vicinity of the outer peripheral 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 made of a metal material (a metal material with a low ionization tendency) that is more noble than the metal material forming the pump casing 3 and the impeller 5 . That is, the adhesion prevention electrode 6 is made of a metal material that is more noble than iron (including alloys 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 with different ionization tendencies are placed in close proximity to each other in water, deposits will actively adhere to the metal material with low ionization tendency, while deposits will adhere to the metal material with 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 such that corrosion of the pump casing 3 and the impeller 5 can be prevented by making the pump casing 3 and the impeller 5 positively corroded by the anti-adhesion electrode 6 . ing.

The water level detector 7 is a float type water level detector. The water level detector 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 keep the pump casing 3 submerged in water based on the detection result of the water level detector 7 .

Specifically, the water level detector 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 . 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 the 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 is started based on 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 decreases, the second float 71 moves downward and a predetermined pump stop water level is detected. Then, the submersible pump 100 stops based on 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 passed since 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)
The following effects can be obtained in the first embodiment.

In the first embodiment, as described above, the metal material forming the impeller 5 and the metal material forming the pump casing 3 are made of a nobler metal material, and deposits on the impeller 5 and the pump casing 3 are removed. An adhesion prevention electrode 6 is provided to prevent adhesion. As a result, the ionization tendencies between the impeller 5 and the pump casing 3 and the anti-adhesion electrode 6 can be reversed from the conventional ionization tendencies between the pump casing 3 and the anti-corrosion electrode. That is, the impeller 5 and the pump casing 3 can be positively corroded. Therefore, it is possible to prevent (suppress) deposits from adhering to the impeller 5 and the pump casing 3 . As a result, it is possible to prevent (suppress) impediment of rotation of the impeller 5 due to contact (or adhesion) of the impeller 5 with the adhering matter. As a result, it is possible to prevent (suppress) the deterioration of the pump efficiency.

In the first embodiment, the adhesion prevention electrode 6 is arranged near the impeller 5 and outside the pump casing 3 as described above. This facilitates replacement work (attachment work and removal work) of the adhesion prevention electrode 6 .

In the first embodiment, 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 described above. 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 includes the pump casing main body 3b inside which the pump chamber 3a is provided, and the suction cover 4 having the suction port 4a and installed on the pump casing main body 3b. The adhesion prevention electrode 6 is positioned inside the pump chamber 3a on the opposite side of the facing surface 4b of the suction cover 4 that faces the impeller 5, and on the outer surface 4c positioned outside the pump chamber 3a. is set up. Here, it is considered that the impeding rotation of the impeller due to the deposits is caused particularly 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 of matter to the facing surface 4b can be effectively prevented (suppressed). can do. Therefore, it is possible to effectively prevent (suppress) impediment of the rotation of the impeller 5 due to contact of the deposits adhering to the opposing surface 4b 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. It is fixed to the casing main body 3b. As a result, the anti-adhesion electrode 6 can be fixed by the existing suction cover bolt 6 a without providing a special structure for fixing the anti-adhesion 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 anti-adhesion electrode 6 made of copper, which is a metal material (a metal material with a low ionization tendency) that is more noble than the pump casing 3 made of iron or aluminum. can be prevented (suppressed).

In the first embodiment, as described above, the water level detector 7 for detecting the water level in the area R where the submersible pump main body 9 is installed is further provided. is configured to hold Here, when the pump casing 3 is maintained in a submerged state, the water containing deposits adhering to the surface of the pump casing 3 will not be exposed above the water surface and dried. It is thought that the adhesion of Therefore, by configuring as described above, it is possible to maintain the submerged state of the pump casing 3 by the water level detection unit 7 and effectively suppress adhesion of deposits to the pump casing 3 .

[Second embodiment]
A second embodiment will be described with reference to FIG. In this second embodiment, unlike the above-described 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 arranged on the suction cover 4. An example of arranging inside the recess 40 will be described. In addition, in the figure, the same code|symbol is attached|subjected to the part of the structure similar to the said 1st Embodiment.

The submersible pump 200 of the second embodiment has an anti-adhesion electrode 206 .

The anti-adhesion electrode 206 is arranged inside a recess 40 recessed above the suction cover 4 . Specifically, the anti-adhesion electrode 206 is arranged on the bottom portion of the upper side of the recess 40 . The adhesion prevention electrode 206 is an annular plate-like member surrounding the suction port 4a. The adhesion prevention electrode 206 is fixed to the suction cover 4 with a bolt B2. The bolt B<b>2 is a dedicated bolt for fixing the adhesion prevention electrode 206 to the suction cover 4 .

The thickness of the adhesion prevention electrode 206 in the axial direction (Z direction) of the rotation shaft 1 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 approximately half the thickness of the suction cover 4 .

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

(Effect of Second Embodiment)
The following effects can be obtained in the second embodiment.

In the second embodiment, by configuring as described above, like the first embodiment, the rotation of the impeller 5 is hindered by the deposits that come into contact with (or adhere to) the impeller 5. can be prevented (suppressed).

In the second embodiment, as described above, the adhesion prevention electrode 206 is an annular plate-like 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 the adhesion of deposits to the facing surface 4b can be more effectively prevented ( suppression). Therefore, it is possible to more effectively prevent (suppress) the impediment of the rotation of the impeller 5 due to the deposit adhering to the facing surface 4 b 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 arranged on the suction cover 4, an example in which the adhesion prevention electrode 306 is arranged on the rotating shaft 1 will be described. In addition, in the figure, the same code|symbol is attached|subjected to the part of the structure similar to the said 1st Embodiment.

The submersible pump 300 of the third embodiment has an anti-adhesion electrode 306 .

The adhesion prevention electrode 306 is an impeller fixing member that fixes the impeller 5 to the one end 1 a of the rotating shaft 1 . Specifically, the adhesion prevention electrode 306 is a cap 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 3 a inside the pump casing 3 . The adhesion prevention electrode 306 is installed on one end 1a (lower end) of the rotary shaft 1 by screwing.

(Effect of the third embodiment)
The following effects can be obtained in the third embodiment.

In the third embodiment, by configuring as described above, as in the first embodiment, the rotation of the impeller 5 is hindered by the deposits coming into contact with (or adhering to) the impeller 5. can be prevented (suppressed).

In the third embodiment, 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 described above. As a result, since the adhesion prevention electrode 306 can be arranged relatively close to the impeller 5, the rotation of the impeller 5 is hindered by the adhesion (or adherence) to the impeller 5. 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 the one end 1 a of the rotating shaft 1 . As a result, the impeller fixing member, which is an existing structure for fixing the impeller 5 to the rotating shaft 1, can be used as the adhesion prevention electrode 306, so that a dedicated structure is provided as the adhesion prevention electrode 306. The number of parts can be reduced compared to the case. 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 cap nut that fixes the impeller 5 to the one end 1a of the rotating shaft 1 by sandwiching the impeller 5 with 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 cap nut, which is an existing configuration.

[Fourth embodiment]
A fourth embodiment will be described with reference to FIGS. 5 and 6. FIG. In this fourth embodiment, unlike the first embodiment in which the adhesion prevention electrode 6 is arranged on the suction cover 4, an example in which the adhesion prevention electrode 406 is arranged on the impeller 5 will be described. In addition, in the figure, the same code|symbol is attached|subjected to the part of the structure similar to the said 1st Embodiment.

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

Here, as described in the first embodiment, the impeller 5 includes a plate-like portion 50 extending in a direction intersecting the axial direction of the rotating shaft 1 and a suction port 4a from the plate-like portion 50 to the pump chamber 3a. wing portions 51 protruding to the side. The adhesion prevention electrode 406 is installed on the other surface 50b of the plate-like portion 50 opposite to the one surface 50a on the blade portion 51 side inside the pump chamber 3a. The adhesion prevention electrode 406 is formed in an annular shape surrounding the rotating shaft 1 . The adhesion prevention electrode 406 is installed so as to contact the (substantially) entirety of the other surface 50b.

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

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. is set sufficiently large compared to In this case, a predetermined amount of space is provided between the upper surface 406a of the adhesion prevention electrode 406 and the pump casing 3 so that even if the adhesion adheres to the upper surface 406a, the adhesion does not hinder the rotation of the impeller 5. A clearance (relatively large clearance) is required.

(Effect of the fourth embodiment)
The following effects can be obtained in the fourth embodiment.

In the fourth embodiment, by configuring as described above, like the first embodiment, the rotation of the impeller 5 is hindered by the deposits coming into contact with (or adhering to) the impeller 5. can be prevented (suppressed).

In the fourth embodiment, as described above, the impeller 5 includes the plate-like portion 50 extending in the direction intersecting the axial direction of the rotating shaft 1 and protruding from the plate-like 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-like portion 50 opposite to the one surface 50a of the plate-like portion 50 on the side of the blade portion 51 inside the pump chamber 3a. As a result, the adhesion prevention electrode 406 can be directly installed on the impeller 5 surrounded by the pump casing 3 , thereby effectively preventing (suppressing) adhesion of deposits to the impeller 5 and the pump casing 3 . be able to.

[Fifth embodiment]
A fifth embodiment will be described with reference to FIG. In this fifth embodiment, unlike the first embodiment in which the anti-adhesion electrode 6 is arranged below the pump casing 3, an example in which the anti-adhesion electrode 506 is arranged on the side of the pump casing 3 will be described. In addition, in the figure, the same code|symbol is attached|subjected to the part of the structure similar to the said 1st Embodiment.

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

The anti-adhesion 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 that is mounted on the submersible pump main body 9. As shown in FIG. That is, the adhesion prevention electrode 506 is arranged at a position where at least a portion thereof overlaps with the pump casing 3 in the vertical direction (the axial direction of the rotating shaft).

(Effect of the fifth embodiment)
The following effects can be obtained in the fifth embodiment.

In the fifth embodiment, by configuring as described above, like the first embodiment, the rotation of the impeller 5 is hindered by the deposits coming into contact with (or adhering to) the impeller 5. 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 attachment member 506a attached to the submersible pump main body 9. As shown in FIG. As a result, the anti-adhesion electrode 506 can be attached to the submersible pump body 9 by the attachment member 506a outside the submersible pump body 9, so that the replacement work (attachment work and removal work) of the adhesion prevention electrode 506 is facilitated. can be done.

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

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

Further, in the above-described first to fifth embodiments, an example in which the adhesion prevention electrode is made of copper has been shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be made of a metal material other than copper, such as silver or lead, as long as the metal material is more noble than the impeller and the pump casing. However, from the viewpoint of suppressing corrosion of the impeller and the pump casing, it is preferable that the ionization tendency of the adhesion prevention electrode is close to the ionization tendency of the impeller and the pump casing.

Further, in the above-described first to fifth embodiments, an example in which the pump casing is made of iron has been shown, but the present invention is not limited to this. In the present invention, the pump casing may be made of a metal material other than iron, such as aluminum, as long as the metal material is less noble than the adhesion preventing electrode. However, from the viewpoint of suppressing corrosion of the pump casing, it is preferable that the ionization tendency of the pump casing is close to the ionization tendency of the anti-adhesion electrode.

Further, in the above-described first to fifth embodiments, an example in which the impeller is made of iron (such as ductile cast iron or high-chromium cast iron) has been shown, but the present invention is not limited to this. In the present invention, the impeller may be made of a metal material other than iron as long as the metal material is less noble than the adhesion preventing electrode. However, from the viewpoint of suppressing 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 made of either the same metal material as the pump casing or a different metal material.

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

Further, in the above-described first to fifth embodiments, examples were shown in which the pump casing includes the suction cover, 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 body may have the suction port. In this case, the adhesion prevention electrode may be directly installed 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 above-described first embodiment, an example in which the submersible pump includes a plurality of anti-adhesion electrodes has been described, but the present invention is not limited to this. In the present invention, the submersible pump may have one anti-adhesion electrode. In this case, one anti-adhesion electrode may be an annular plate member surrounding the suction port.

Further, in the above second to fifth embodiments, an example in which the submersible pump is provided with one anti-adhesion electrode has been shown, but the present invention is not limited to this. In the present invention, the submersible pump may have a plurality of anti-adhesion electrodes.

Further, in the above-described second and fourth embodiments, an example in which the adhesion prevention electrode is formed in an annular shape has been shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be formed in a shape such as a semicircular shape or a rectangular shape.

In the second embodiment, the thickness of the adhesion prevention electrode in the axial direction of the rotating shaft is smaller than the thickness of the portion of the suction cover where the adhesion prevention electrode is installed. Although an example in which the thickness is approximately half the thickness of the suction cover has been shown, the present invention is not limited to this. In the present invention, the thickness of the anti-adhesion electrode in the axial direction of the rotating shaft may be thicker than the thickness of the portion of the suction cover where the anti-adhesion electrode is installed, or the thickness of the anti-adhesion electrode may be thicker than the thickness of the suction cover. It may be configured to be less than about half the thickness of the cover.

Further, in the above-described fourth embodiment, an example in which the anti-adhesion electrode is fixed to the suction cover with 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 above-described third embodiment, an example in which the impeller is fixed to the rotating shaft by the cap nut, which is the adhesion prevention electrode, is shown, but the present invention is not limited to this. In the present invention, the adhesion prevention electrode may be configured by a bolt, and the impeller may be fixed to the rotating shaft by the bolt, which is the adhesion prevention electrode.

Reference Signs List 1 rotary 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-like part 50a One surface 50b Other surface 51 Blades 100, 200, 300, 400, 500, 600 Submersible pump 506a Mounting member R area

Claims (8)

a metal pump casing;
a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing;
It is installed near the impeller and made of a metal material that is more noble than the metal material forming the impeller and the metal material forming the pump casing, and prevents deposits from adhering to the impeller and the pump casing. and an anti-adhesion electrode for preventing
The pump casing includes a pump casing main body inside which the pump chamber is provided, and a cover member having a suction port to the pump chamber and provided on the pump casing main body,
The adhesion prevention electrode is located inside the pump chamber on the opposite side of the surface of the cover member facing the impeller, and is installed on the outer surface located outside the pump chamber. ,underwater pump. further comprising a cover member fixing member for fixing the cover member to the pump casing main body,
2. The submersible pump according to claim 1 , wherein said adhesion prevention electrode is fixed to said pump casing main body together with said cover member by said fixing member for cover member. 3. The submersible pump according to claim 1 , wherein said anti-adhesion electrode is an annular plate member surrounding said suction port. a metal pump casing;
a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing;
It is installed near the impeller and made of a metal material that is more noble than the metal material forming the impeller and the metal material forming the pump casing, and prevents deposits from adhering to the impeller and the pump casing. and an anti-adhesion electrode for preventing
The impeller includes a plate-shaped portion extending in a direction intersecting with the axial direction of the rotating shaft, and a blade portion projecting from the plate-shaped portion toward the suction port side of the pump chamber,
The anti-adhesion electrode is disposed inside the pump chamber on the other surface of the plate-like portion opposite to the one surface on the blade portion side. a metal pump casing;
a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing;
It is installed near the impeller and made of a metal material that is more noble than the metal material forming the impeller and the metal material forming the pump casing, and prevents deposits from adhering to the impeller and the pump casing. and an anti-adhesion electrode for preventing
The submersible pump, wherein the adhesion prevention electrode is an impeller fixing member that fixes the impeller to the one end of the rotating shaft. 6. The submersible pump according to claim 5 , wherein the adhesion prevention electrode is a cap nut that fixes the impeller to the one end of the rotating shaft by sandwiching the impeller and the rotating shaft. a metal pump casing;
a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing;
It is installed near the impeller and made of a metal material that is more noble than the metal material forming the impeller and the metal material forming the pump casing, and prevents deposits from adhering to the impeller and the pump casing. and an anti-adhesion electrode for preventing
The submersible pump, wherein the anti-adhesion electrode is installed on the side of the pump casing outside the pump chamber via an attachment member attached to the submersible pump main body. a metal pump casing;
a metal impeller fixed to one end of a rotating shaft and arranged in a pump chamber inside the pump casing;
It is installed near the impeller and made of a metal material that is more noble than the metal material forming the impeller and the metal material forming the pump casing, and prevents deposits from adhering to the impeller and the pump casing. and an anti-adhesion electrode for preventing
The pump casing is made of iron or aluminum,
The submersible pump, wherein the anti-adhesion electrode is made of copper.

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