JP2018155132A - Land pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a land pump that can prevent electric corrosion.SOLUTION: A land pump 100 includes: a casing 1; a flange connected to piping; an impeller 8 disposed inside the casing 1; a motor 5 for rotating the impeller 8; a direct-current power supply 43; an anode electrode 40 connected to the direct-current power supply 43; and a cathode electrode 41 connected to the direct-current power supply 43. The anode electrode 40 or cathode electrode 41 is provided to a flange.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a land pump.

  2. Description of the Related Art Conventionally, an anticorrosion system that prevents corrosion of metal pipes that transfer seawater is known (see Patent Document 1). This cathodic protection system includes two flange portions for connecting a joint portion of a metal pipe, an anode electrode for cathodic protection provided between the two flange portions and in contact with water inside the metal pipe, and a metal pipe. And a DC power source. In such an anticorrosion system, by supplying a current between the anode electrode and the terminal, it is possible to prevent the metal pipe from being thinned due to corrosion and the occurrence of leakage due to pitting corrosion.

  Further, a submersible pump facility is known that prevents corrosion in facilities such as a submersible pump (see Patent Document 2). This submersible pump facility is electrically connected to the submersible pump connected to the opening at one end of the connecting pipe, the drain pipe connected to the opening at the other end of the connecting pipe, and the connecting pipe via a conductive material. The anticorrosion member made into the connection state is provided. In such a submersible pump equipment, corrosion of a submersible pump, a connecting pipe, etc. is prevented when a corrosion prevention member melts in water.

JP2015-129346A JP 2000-310194 A

  By the way, the said conventional cathodic protection system does not disclose applying to a general-purpose small land pump. Moreover, the submersible pump equipment provided with the anticorrosive member has a problem that a large equipment is required and the miniaturization cannot be achieved.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a land pump capable of cathodic protection.

  In order to solve the above problems, a land pump according to one aspect of the present invention includes a casing, a flange connected to a pipe, an impeller disposed in the casing, a motor that rotates the impeller, A DC power supply, an anode electrode connected to the DC power supply, and a cathode electrode connected to the DC power supply are provided, and the anode electrode or the cathode electrode is provided on the flange.

In the land pump according to the above aspect, the anode electrode may be provided on the flange, and the cathode electrode may be provided on the casing or the pipe.
According to the land pump according to the above aspect, current is supplied from the DC power source to the anode electrode. For this reason, electrons are supplied to the inner surface of the casing or pipe to which the cathode electrode is connected, that is, the inner surface in contact with seawater. The cations (positive ions) in the sea water are attracted to the inner surface of the casing or the inner surface of the pipe, and release of metal cations on the inner surface of the casing or the inner surface of the pipe due to the corrosion reaction is suppressed.

  For example, when the inner surface of the casing or the inner surface of the pipe is corroded, the corroded material may enter the land pump due to peeling of the corroded material, and the land pump may be damaged due to the corroded material. On the other hand, according to the land pump concerning the above-mentioned mode, since corrosion of a casing or piping is controlled, failure of the above-mentioned land pump can be prevented.

  In addition, the above effect can be obtained simply by providing the anode electrode on the flange and connecting the cathode electrode to the casing or piping, so the corrosion of the casing or piping can be suppressed with a simple structure, and breakdown of the land pump can be prevented. can do.

In the land pump according to the above aspect, the flange may be a suction flange provided on the suction side of the casing, and the anode electrode or the cathode electrode may be provided on the suction flange.
In the land pump according to the above aspect, the flange may be a discharge flange provided on the discharge side of the casing, and the anode electrode or the cathode electrode may be provided on the discharge flange.

The land pump according to the above aspect may include a generator that converts the rotational force of the motor into electric power and supplies electric power to the DC power source.
According to the land pump according to the above aspect, it is possible to apply a voltage between the anode electrode and the cathode electrode by using the electric power generated by the generator, and to pass a current through the anode electrode.

  According to the above aspect of the present invention, a land pump capable of cathodic protection can be provided.

It is a fragmentary sectional view showing a schematic structure of a land pump concerning an embodiment of the present invention. It is a fragmentary sectional view which shows the modification 1 of the land pump which concerns on embodiment of this invention. It is a fragmentary sectional view which shows the modification 2 of the land pump which concerns on embodiment of this invention.

Hereinafter, the configuration of the land pump according to the present embodiment will be described with reference to FIG.
In each drawing used for explanation of the present embodiment, the scale of each member is appropriately changed in order to make each member a recognizable size.
In the present embodiment, the “suction side” means the position or region where the fluid flows into the land pump, that is, the upstream side in the fluid flow direction. “Discharge side” means the position or region where the fluid flows out from the land pump, that is, the downstream side in the fluid flow direction.

  The land pump according to the present embodiment is a general-purpose small pump (standard pump) having a diameter of 600 mm or less, and a centrifugal pump that sucks and discharges water containing salt such as seawater. In the following description, a case where the fluid transferred by the land pump is seawater will be described.

  As shown in FIG. 1, the land pump 100 includes a casing 1, a suction nozzle 4, a motor 5, an impeller 8, a main shaft 10, a suction flange 11 (flange), a discharge flange 14 (flange), Insulating seal member 15, discharge nozzle 22, anode electrode 40, cathode electrode 41, and DC power supply 43 are provided. Of the members constituting the above-described land pump 100, members that contact seawater, that is, the casing 1, the suction nozzle 4, the impeller 8, the suction flange 11, the discharge flange 14, and the discharge nozzle 22 are formed of high-grade materials such as stainless steel. Has been.

  A suction pipe flange 12 of a suction pipe 25 (pipe) is connected to the suction side of the land pump 100. A discharge pipe flange 13 of a discharge pipe 26 (pipe) is connected to the discharge side of the land pump 100. An end (not shown) of the suction pipe 25 opposite to the suction pipe flange 12 is disposed in seawater or in a storage tank in which seawater is stored. On the other hand, the end (not shown) of the discharge pipe 26 opposite to the discharge pipe flange 13 is disposed in a storage tank in which seawater transferred by the land pump 100 is stored.

  The impeller 8 is provided in the casing 1 and is connected to the main shaft 10. The main shaft 10 is connected to the motor 5. The motor 5 is connected to a power source (not shown), and the motor 5 is rotated by electric power supplied from the power source. The rotational driving force of the motor 5 is transmitted to the impeller 8 through the main shaft 10, and the impeller 8 can rotate in the casing 1.

On the suction side of the land pump 100, the suction nozzle 4 is located between the casing 1 and the suction flange 11. One end (first end) of the suction nozzle 4 is connected to the suction flange 11, and the other end (second end) of the suction nozzle 4 is connected to the casing 1.
The suction flange 11 is connected and fixed to the suction pipe flange 12 by fastening members 32 and 33. An insulating seal member (not shown) such as an insulating gasket is provided between the suction flange 11 and the suction pipe flange 12, and the connection between the suction flange 11 and the suction pipe flange 12 is hermetically sealed. ing.

On the discharge side of the land pump 100, the discharge nozzle 22 is located between the casing 1 and the discharge flange 14. One end (first end) of the discharge nozzle 22 is connected to the discharge flange 14, and the other end (second end) of the discharge nozzle 22 is connected to the casing 1.
The discharge flange 14 is connected and fixed to the discharge pipe flange 13 by fastening members 30 and 31. An insulating seal member 15 is provided between the discharge flange 14 and the discharge pipe flange 13, and a connection portion between the discharge flange 14 and the discharge pipe flange 13 is sealed.
As the fastening members 30, 31, 32, 33, for example, known bolts and nuts are used.

The anode electrode 40 is provided at a connection portion between the discharge flange 14 and the discharge pipe flange 13, and is covered and fixed by the insulating seal member 15. The anode electrode 40 is exposed inside the discharge flange 14 and the discharge pipe flange 13 so as to come into contact with seawater transferred by the land pump 100. Examples of the material constituting the anode electrode 40 include carbon, graphite, and ferrite.
The cathode electrode 41 is connected to the outside of the discharge pipe 26 at a position away from the position where the anode electrode 40 is installed.

  The wiring extending from each of the anode electrode 40 and the cathode electrode 41 is connected to the DC power source 43. The anode electrode 40 is connected to the positive side of the DC power supply 43 through a wiring. The cathode electrode 41 is connected to the negative side of the DC power supply 43 through wiring. The DC power supply 43 includes an AC-DC converter that converts commercial power (AC) into DC, and a DC voltage can be applied between the anode electrode 40 and the cathode electrode 41. Further, as the DC power source 43, for example, a primary battery, a secondary battery, a solar battery, or the like may be used. The voltage applied between the anode electrode 40 and the cathode electrode 41 is about 1V to 2V.

Next, the operation of the land pump 100 configured as described above will be described.
When the motor 5 rotates, the driving force of the motor 5 is transmitted to the impeller 8 via the main shaft 10, and the impeller 8 rotates in the casing 1. Seawater is sucked into the casing 1 from the suction pipe 25 through the suction nozzle 4 by the rotational force of the impeller 8, and seawater is discharged from the casing 1 into the discharge pipe 26 through the discharge nozzle 22. On the other hand, when the rotation of the motor 5 stops, seawater remains in the suction pipe 25, the suction nozzle 4, the casing 1, the discharge nozzle 22, and the discharge pipe 26. In such a land pump 100, the rotation drive and rotation stop of the motor 5 are repeated, and seawater flows from the inner surface of the casing 1, the inner surface of the suction nozzle 4, the inner surface of the impeller 8, the inner surface of the suction flange 11, and the discharge flange 14. And the inner surface of the discharge nozzle 22.

  In the use state of the land pump 100 as described above, a current is supplied from the DC power supply 43 to the anode electrode 40. For this reason, electrons are supplied to the inner surface of the discharge pipe 26 to which the cathode electrode 41 is connected, that is, the inner surface of the discharge pipe 26 in contact with seawater. The cations (positive ions) in the sea water are attracted to the discharge pipe 26 and the release of metal cations in the discharge pipe 26 due to the corrosion reaction is suppressed.

  As described above, according to the land pump 100 according to the present embodiment, corrosion of the discharge pipe 26 can be suppressed. For example, when the discharge pipe 26 corrodes, the corroded matter generated from the discharge pipe 26 is peeled off from the discharge pipe 26, and the peeled corroded substance enters the inside of the land pump 100, and the trouble of the land pump 100 due to the corroded substance. There is a risk of inviting. On the other hand, in this embodiment, since the corrosion of the discharge pipe 26 is suppressed, the above-described failure of the land pump 100 can be prevented.

Further, the above effect can be obtained only by providing the anode electrode 40 between the discharge flange 14 and the discharge pipe flange 13 and connecting the cathode electrode 41 to the discharge pipe 26. Therefore, the discharge pipe 26 has a simple structure. Corrosion can be suppressed, and failure of the land pump 100 can be prevented.
Moreover, as a member which comprises the land pump 100, although high-grade materials, such as stainless steel, are used as mentioned above, corrosion of such high-grade materials can be prevented.

(Modification 1)
Next, Modification 1 of the land pump will be described with reference to FIG.
In FIG. 2, the same members as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

The land pump 200 according to the first modification is different from the land pump 100 according to the above-described embodiment in that an anode electrode 40 is provided at a connection portion between the suction flange 11 and the suction pipe flange 12.
Specifically, the anode electrode 40 is covered and fixed by the insulating seal member 15 at the connection portion between the suction flange 11 and the suction pipe flange 12. The anode electrode 40 is exposed inside the suction flange 11 and the suction pipe flange 12 so as to be in contact with seawater transferred by the land pump 200. The cathode electrode 41 is connected to the outside of the suction pipe 25 at a position away from the position where the anode electrode 40 is installed.

  In the use state of the land pump 200 as described above, current is supplied from the DC power supply 43 to the anode electrode 40. For this reason, electrons are supplied to the inner surface of the suction pipe 25 to which the cathode electrode 41 is connected, that is, the inner surface of the suction pipe 25 in contact with seawater. The cations (positive ions) in the sea water are attracted to the suction pipe 25 and the release of metal cations in the suction pipe 25 due to the corrosion reaction is suppressed.

  As described above, according to the land pump 200 according to the first modification, the corrosion of the suction pipe 25 can be suppressed. For example, when the suction pipe 25 corrodes, the corroded matter generated from the suction pipe 25 peels off from the suction pipe 25, and the peeled corroded substance enters the inside of the land pump 200. There is a risk of inviting. On the other hand, in this modification 1, since corrosion of the suction pipe 25 is suppressed, the above-described failure of the land pump 200 can be prevented.

  Further, the above effect can be obtained only by providing the anode electrode 40 between the suction flange 11 and the suction pipe flange 12 and connecting the cathode electrode 41 to the suction pipe 25. Therefore, the discharge pipe 26 has a simple structure. The corrosion of the land pump 200 can be prevented.

(Modification 2)
Next, Modification 2 of the land pump will be described with reference to FIG.
In FIG. 3, the same members as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

The land pump 300 according to the second modification is different from the land pump 100 according to the above-described embodiment in that a generator 62 that supplies power to the DC power supply 43 is provided in the motor 5.
Specifically, the land pump 300 includes a generator 62 that converts the rotational force of the motor 5 into electric power and supplies the electric power to the DC power supply 43. The land pump 300 includes an AC-DC converter 61 that converts AC power generated by the generator 62 into DC power. The AC-DC converter 61 supplies DC power to the DC power supply 43.
If the DC power supply 43 has the function of an AC-DC converter, the generator 62 and the DC power supply 43 are not provided without providing the AC-DC converter 61 between the DC power supply 43 and the generator 62. May be connected.

  According to the second modification, a voltage can be applied between the anode electrode 40 and the cathode electrode 41 by using the power generated by the generator 62, and a current can flow through the anode electrode 40. Moreover, the effect mentioned above is acquired.

(Modification 3)
In the embodiment and the first and second modifications, the anode electrode 40 is flanged (a connection portion between the suction flange 11 and the suction piping flange 12 or a connection portion between the discharge flange 14 and the discharge piping flange 13). However, the cathode electrode 41 may be provided outside the flange. In this case, the anode electrode 40 is provided in piping (suction piping 25, discharge piping 26) so that it may contact seawater. In this case, cations in the seawater are attracted to the flange, and release of metal cations on the flange due to the corrosion reaction is suppressed. For this reason, corrosion of the flange is suppressed.

(Modification 4)
In the embodiment and the first and second modifications, the cathode electrode 41 is provided in the pipe (the suction pipe 25 and the discharge pipe 26), but the cathode electrode 41 may be provided in the casing 1. In this case, the anode electrode 40 is connected to the suction flange 11 or the discharge flange 14.
According to the fourth modification, electrons are supplied to the inner surface of the casing 1 to which the cathode electrode 41 is connected, that is, the inner surface of the casing 1 in contact with seawater. The cations (positive ions) in the sea water are attracted to the casing 1 and the release of the metal cations in the casing 1 due to the corrosion reaction is suppressed. Therefore, corrosion of the casing 1 can be suppressed. Since corrosion of the casing 1 is suppressed, it is possible to prevent a land pump from failing.
Since the above effect can be obtained simply by connecting the cathode electrode 41 to the casing 1, corrosion of the casing 1 can be suppressed and failure of the land pump can be prevented with a simple structure.
The cathode electrode 41 may be connected to the suction nozzle 4 or the discharge nozzle 22.

(Modification 5)
The anode electrode 40 is provided on both the suction flange 11 (connection portion between the suction flange 11 and the suction piping flange 12) and the discharge flange 14 (connection portion between the discharge flange 14 and the discharge piping flange 13). Also good.

(Modification 6)
In the embodiment and the first and second modifications, the cathode electrode 41 is provided in the pipe (the suction pipe 25 and the discharge pipe 26). However, the cathode electrode 41 and the impeller 8 are electrically connected. It may be adopted. In this case, corrosion of the impeller 8 can be prevented.

  While preferred embodiments and variations of the present invention have been described and described above, it should be understood that these are exemplary of the invention and should not be considered as limiting. is there. Additions, omissions, substitutions, and other changes can be made without departing from the scope of the invention. Accordingly, the invention is not to be seen as limited by the foregoing description, but is limited by the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Casing 4 Suction nozzle 5 Motor 8 Impeller 10 Main shaft 11 Suction flange 12 Suction piping flange 13 Discharge piping flange 14 Discharge flange 15 Insulation sealing member 22 Discharge nozzle 25 Suction piping 26 Discharge piping 30, 31, 32, 33 Fastening member 40 Anode Electrode 41 Cathode electrode 43 DC power supply 61 AC-DC converter 62 Generator 100, 200, 300 Land pump

Claims (5)

A land pump,
A casing,
A flange connected to the piping;
An impeller disposed in the casing;
A motor for rotating the impeller;
DC power supply,
An anode electrode connected to the DC power source;
A cathode electrode connected to the DC power source;
With
The anode pump or the cathode electrode is a land pump provided on the flange. The anode electrode is provided on the flange,
The land pump according to claim 1, wherein the cathode electrode is provided in the casing or the pipe. The flange is a suction flange provided on the suction side of the casing,
The land pump according to claim 1, wherein the anode electrode or the cathode electrode is provided on the suction flange. The flange is a discharge flange provided on the discharge side of the casing,
The land pump according to claim 1, wherein the anode electrode or the cathode electrode is provided on the discharge flange.   The land pump as described in any one of Claims 1-4 provided with the generator which converts the rotational force of the said motor into electric power, and supplies electric power to the said DC power supply.

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