KR102487110B1 - Submersible pump - Google Patents

Abstract

The present invention relates to a three-phase underwater pump with a leakage current shielding function, which comprises: a pump housing (20) which connects to a power cable (C) having R, T, S, and N lines, and houses a drive motor (10) operating by the three-phase power supplied through the R, T, and S lines, and to which the N line is grounded; a pump chamber (30) which is installed on the lower side of the pump housing (20), and suctions and discharges water by an impeller (33) rotated by the drive motor (10); a housing cap (40) which is coupled to the upper side of the pump housing (20) and has an internal accommodation space (41); a first leakage current shielding unit (50) which is installed in the accommodation space (41) and, when a first leakage current occurs through the R line, passes the first leakage current through the N line; a second leakage current shielding unit (60) which is installed in the accommodation space (41), and when a second leakage current occurs through the S line, passes the second leakage current through the N line; and a third leakage current shielding unit (70) which is installed in the accommodation space (41), and when a third leakage current occurs through the T line, passes the third leakage current through the N line.

Description

Three-phase submersible pump having a leakage current shielding function {Submersible pump}

The present invention relates to a three-phase submersible pump operated by a three-phase power supply, and more particularly, a leakage current shielding function that significantly reduces the possibility of electric shock by preventing leakage current generated from each of the three-phase power lines from flowing into the working environment. Branches relate to three-phase submersible pumps.

In general, a submersible pump is for draining stagnant water to the outside in a depression in the ground, for example, a puddle or a basement. These submersible pumps can be implemented in various sizes according to the amount of displacement. Basically, a pump housing with a built-in drive motor and an impeller installed on the lower side of the pump housing suck and discharge water by the impeller rotated by the drive motor. It consists of a pump chamber and a housing cap coupled to the upper side of the pump housing and containing accessories for operating the drive motor. The pump chamber includes an inlet toward the bottom of the depression and an outlet to which a drain hose connected to the outside is connected do. At this time, in order to implement a large-capacity submersible pump, a three-phase 600V or less, for example, a driving motor operating with 380V power is used. In such a submersible pump, when the drive motor rotates the impeller, water is introduced through the inlet of the bottom of the depression and then drained to the outside through the outlet and the drainage hose.

However, since the environment in which submersible pumps are used is often very harsh, there is always a possibility that the power cable coating connected to the drive motor may be peeled off by other objects, and also, there is a possibility that the power cable coating is hardened and peeled off during long-term use. there is. In this case, a current of 600V may leak through the power cable, and a worker performing drainage work may be electrocuted, resulting in a dangerous situation to the extent of losing life.

In reality, cases in which a worker is electrocuted while performing drainage work using a submersible pump occur repeatedly every year.

The present invention has been created to solve the above problems, and in a three-phase underwater motor, a three-phase underwater motor having a leakage current shielding function that can significantly reduce the possibility of electric shock to the operator by preventing leakage current from flowing into the working environment. It is intended to provide a pump.

In order to achieve the above object, the three-phase submersible pump having a leakage current shielding function according to the present invention is connected to a power cable (C) consisting of R, T, S, and N lines, and the R, T, A pump housing 20 in which a driving motor 10 operated by a three-phase power supplied through an S line is embedded and an N line is grounded; A pump chamber 30 installed on the lower side of the pump housing 20 and sucking and discharging water by the impeller 33 rotated by the driving motor 10; a housing cap 40 coupled to the upper side of the pump housing 20 and having an accommodation space 41 therein; a first leakage current shielding unit 50 built into the accommodating space 41 and flowing the first leakage current through the N line when the first leakage current is generated through the R line; a second leakage current shielding unit (60) built into the accommodating space (41) and passing the second leakage current through the N line when the second leakage current is generated through the S line; and a third leakage current shield 70 built into the receiving space 41 and flowing the third leakage current through the N line when the third leakage current is generated through the T line. characterized by

In the present invention, the first leakage current shielding unit 50 sets a first modulation frequency for compensating the frequency so that the potential difference of the first leakage current is zero potential when the first leakage current is generated in the R line. A first modulation frequency generator 51 generated and a first grounding distributor 52 for flowing a first leakage current corresponding to the first modulation frequency to an N line grounded to the pump housing 20, ; The second leakage current shielding unit 60 generates a second modulation frequency for compensating the frequency so that the potential difference of the second leakage current is zero potential when the second leakage current is generated in the S line. It includes a frequency generator 61 and a second ground divider 62 for flowing a second leakage current corresponding to the second modulation frequency to the N line grounded to the pump housing 20; The third leakage current shielding unit 70 generates a third modulation frequency for compensating the frequency so that the potential difference of the third leakage current is zero potential when the third leakage current is generated on the T line. It includes a frequency generator 71 and a third ground divider 72 for flowing a third leakage current corresponding to the third modulation frequency to the N line grounded to the pump housing 20.

In the present invention, it is built in the accommodation space 41 of the housing cap 40, and the drive motor 10 when the pump housing 20 and the pump chamber 30 are directed in the vertical direction (gravity direction) It further includes a tilt interlocking operation unit 80 that supplies power and cuts off the power applied to the drive motor 10 when it falls and tilts.

In the present invention, the inclined interlocking operation unit 80 includes a case 81 fixed to the ceiling of the housing cap 40 from the inside of the accommodation space 41; a spherical surface 82 formed inside the case 81 to open upward; a micro switch 83 installed on the bottom of the spherical surface 82 and having a button 83a protruding upward from the central bottom surface of the spherical surface 82; When the pump housing 20 faces the vertical direction, it is located at the center of the spherical surface 82 and pushes the button 83a, and when the pump housing 20 is tilted, it moves away from the center of the spherical surface 82. A ball 84 to release the push of the button 83a; includes.

In the present invention, the spherical surface 82 has a main spherical surface 82a formed to open to the upper side of the case 81 and a discontinuous step 82c formed at the center of the bottom of the main spherical surface 82a. and a sub-spherical surface 82b having a greater curvature than the main spherical surface 82a to be formed.

In the present invention, as built into the accommodation space 41, when leakage current occurs in at least one of the R line, S line, and T line, a warning unit 90 for informing the outside that leakage current is generated contains more

In the present invention, the warning unit 90 is installed in the receiving space 41 and is installed between the first, second, and third ground distributors 52, 62, and 72 and the pump housing 20 and a leakage current detection sensor 91 generating a leakage current signal when leakage current occurs, and an LED 92 installed inside the accommodation space 41 so as to face the transparent window 42 of the housing cap 40. ) and a blinking operation unit 93 for flickering and lighting the LED 92 in conjunction with each other when the leakage current signal is generated.

According to the present invention, by adopting the first, second, and third leakage current shielding parts 50, 60, and 70 embedded in the accommodation space 41 of the housing cap, as the coating of the power cable C is damaged, Even if the first, second, and third leakage currents of 600V are generated, the first, second, and third leakage currents are collected and sent through the N line, thereby preventing workers working in the surrounding field from being electrocuted.

In addition, by adopting the tilt interlocking operation unit 80, when the submersible pump 100 falls and tilts, power applied to the drive motor 10 can be automatically cut off, thereby preventing the submersible pump from malfunctioning.

In addition, since the first, second, and third leakage current shielding units 50, 60, and 70 and the inclined interlocking operation unit 80 are embedded in the housing cap 40, they are dispatched with various structures during drainage work and are damaged. that can be prevented

1 is a cross-sectional view of a three-phase submersible pump having a leakage current shielding function in the present invention;
2 is a block diagram for explaining the configuration of first, second, and third leakage current shielding units of FIG. 1;
3 is a view for explaining the configuration of the tilt interlocking operation unit of FIG. 1;
4 is a view for explaining the operation of the tilt interlocking operation unit of FIG. 3;
5 is a view for explaining the configuration of the warning unit of FIG. 1;

Hereinafter, a three-phase submersible pump having a leakage current shielding function according to the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, what is described as "above" or "above" may include not only what is directly on top of contact but also what is on top of non-contact. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from another. Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated. In addition, terms such as "...unit" and "module" described in the specification mean a unit that processes at least one function or operation. In addition, in the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the illustrated bar.

1 is a cross-sectional view of a three-phase submersible pump having a leakage current shielding function according to the present invention, and FIG. 2 is a block diagram illustrating the configuration of first, second, and third leakage current shielding units of FIG. 1 .

As shown, the three-phase submersible pump having a leakage current shielding function according to the present invention is connected to a power cable (C) consisting of R, T, S, and N lines, and is supplied through R, T, and S lines. A pump housing 20 in which a drive motor 10 operated by a three-phase power supply is built in and the N line is grounded; As installed on the lower side of the pump housing 20, the pump chamber 30 for sucking and discharging water by the impeller rotated by the driving motor 10; a housing cap 40 coupled to the upper side of the pump housing 20 and having an accommodation space 41 therein; a first leakage current shielding unit 50 built into the accommodating space 41 of the housing cap 40 and allowing the first leakage current to flow through the N line when the first leakage current is generated through the R line; a second leakage current shield 60 built into the accommodation space 41 of the housing cap 40 and flowing the second leakage current through the N line when the second leakage current is generated through the S line; a third leakage current shield 70 built into the accommodation space 41 of the housing cap 40 and flowing the third leakage current through the N line when the third leakage current is generated through the T line; includes

The driving motor 10 is operated by a 3-phase power supply of 600V or less, for example, 380V, and is sealed in the cylindrical pump housing 20. Since the driving motor 10 is built into the metal pump housing 20, the N line is directly or indirectly grounded to the driving motor 10 through the pump housing 20.

In the pump chamber 30, an impeller 33 rotated by a drive motor 10 is installed between the inlet 31 and the outlet 32.

Since the pump housing 20 and the pump chamber 30 are general components of a submersible pump, further detailed descriptions thereof will be omitted.

The housing cap 40 includes an accommodation space 41 coupled to the upper side of the pump housing 20 to be sealed off from the external environment, and a transparent window 42 installed to be sealed at the top. The first, second, and third leakage current shielding units 50, 60, 70 and the inclined interlocking operation unit 80 are embedded in the accommodation space 41 to be sealed.

The first, second, and third leakage current shielding parts 50, 60, and 70, when leakage current is generated while the submersible pump 100 of the present invention operates in a basement or puddle in water (underwater) By shielding the leakage current, workers working in the water are prevented from being electrocuted.

The first leakage current shielding unit 50 provides a first leakage current when a first leakage current is generated in the R line, for example, when the coating surrounding the R line of a power cable submerged in water is damaged and the first leakage current is generated. A first modulation frequency generating unit 51 generating a first modulation frequency for frequency compensation so that the potential difference of the leakage current is zero potential, and the first leakage current corresponding to the first modulation frequency is supplied to the pump housing 20 It includes a first ground distributor 52 that flows to the grounded N line.

The second leakage current shielding unit 60 provides a second leakage current when a second leakage current is generated in the S line, for example, when the sheath surrounding the S line of the power cable submerged in water is damaged and the second leakage current is generated. 2 The second modulation frequency generator 61 that generates a second modulation frequency for compensating the frequency so that the potential difference of the leakage current is zero potential, and the second leakage current corresponding to the second modulation frequency is supplied to the pump housing 20 It includes a second ground distributor 62 that flows to the grounded N line.

The third leakage current shielding unit 70 is provided when a third leakage current is generated in the T line, for example, when the coating surrounding the T line of the power cable submerged in water is damaged and the third leakage current is generated. 3 A third modulation frequency generating unit 71 generating a third modulation frequency for compensating the frequency so that the potential difference of the leakage current is at zero potential, and a third leakage current corresponding to the third modulation frequency is applied to the pump housing 20 It includes a third ground distributor 72 flowing to the grounded N line.

The pump housing 20 has a drive motor 10 built in, so that the N line is also grounded with the drive motor 10 through the pump housing 20.

The first, second, and third leakage current shielding units 50, 60, and 70 described above have substantially the same configuration.

The first, second, and third modulation frequency generators 51, 61, and 71 collect the first leakage current when the first, second, and third leakage currents are generated in the R, S, and T lines, respectively. The frequency of the generated first leakage current is changed to a constant amplitude to make the lines of electric force electronically arranged, thereby zeroing the potential difference of the first leakage current.

The first, second, and third ground dividers (52, 62, and 72) are connected to the first, second, and third leakage currents collected from the first, second, and third modulation frequency generators (51, 61, and 71). The leakage current, which is interlocked with zero potential, flows through the N line.

Even if the 12th, 3rd, leakage currents are generated in the R, S, and T lines by the 1st, 2nd, and 3rd leakage current shielding parts 50, 60, and 70, they flow through the N line, resulting in 1, 2, 3 The shielding effect of leakage current can be realized.

In addition, the first, second, and third leakage current shielding parts 50, 60, and 70 are embedded in the accommodation space 41 of the housing cap 40, so that they are completely blocked from the external environment. It is possible to prevent the inclined interlocking motion unit 80 from being damaged by colliding with the structure.

FIG. 3 is a diagram for explaining the configuration of the tilt interlocking operation unit of FIG. 1 , and FIG. 4 is a diagram for explaining the operation of the tilting interlocking operation unit of FIG. 3 .

The three-phase submersible pump 100 of the present invention is built in the accommodation space 41 of the housing cap 40, and the pump housing 20 and the pump chamber 30 constituting the submersible pump 100 are in the vertical direction ( Gravity direction), the drive motor 10 supplies power, and when it falls and tilts, it further includes a tilt interlocking operation unit 80 that cuts off the power applied to the drive motor 10 .

The inclined interlocking operation unit 80 includes a case 81 fixed to the ceiling of the housing cap 40 from the inside of the accommodation space 41; a spherical surface 82 formed inside the case 81 to be open to the upper side; a micro switch 83 installed on the bottom of the spherical surface 82 and having a button 83a protruding upward from the central bottom surface of the spherical surface 82; When the pump housing 20 faces the vertical direction, it is located at the center of the spherical surface 82 to push the button 83a, and when the pump housing 20 is tilted, it moves away from the center of the spherical surface 82, so that the button 83a A ball 84 to release the push; includes. The inclined interlocking movement unit 80 is embedded in the accommodation space 41 of the housing cap 40, so that it can be completely blocked from the external environment, and accordingly, the inclined interlocking movement unit 80 collides with various structures during drainage work. ) is prevented from being damaged.

The spherical surface 82 is formed in the center of the bottom of the main spherical surface 82a, which is formed to be open to the upper side of the case 81, and the main spherical surface 82a, so that a discontinuous step 82c is formed than the main spherical surface 82a. It includes a subspherical surface 82b having a large curvature.

The step 82c formed between the main spherical surface 82a and the sub-spherical surface 82b prevents the water pump 100 from being erected or slightly tilted in the vertical direction while the ball 84 is positioned on the sub-spherical surface 82b. Even if the button 83a is pushed while still maintaining the state of being caught in the sub-spherical surface 82b, and the sub-spherical surface 82b flows toward the main spherical surface 82a when the submersible pump 100 falls and tilts severely, the button The push state of (83a) is released.

The microswitch 83 includes a button 83a protruding toward the upper middle of the sub-spherical surface 82b constituting the spherical surface 82 . The button 83a turns the microswitch 83 on or off depending on whether it is pressed by the weight of the ball 84. When the micro switch 83 is on, the R, S, T lines and the drive motor 10 are electrically connected, and when it is off, the R, S, T lines and the drive motor 10 are electrically cut off. do.

The ball 84 selectively presses the button 83a of the micro switch 83 while rolling between the main spherical surface 82a and the sub-spherical surface 82b bounded by the step 82c.

By this inclined interlocking operation unit 80, the button 83a is pushed in a state where the ball 84 is positioned on the sub-spherical surface 82b, and in this state, the R, S, and T lines and the drive motor 10 electrically connected to At this time, since a step 82c is formed between the main spherical surface 82a and the sub-spherical surface 82b due to the difference in curvature, even if the submersible pump 100 is erected in the vertical direction or slightly tilted, it is still caught in the sub-spherical surface 82b. While maintaining the state, the button 83a is pushed. Accordingly, even if the submersible pump 100 is slightly tilted while being shaken by the water flow during operation, the submersible pump 100 operates normally.

On the other hand, when the submersible pump 100 falls and is severely tilted, as shown in FIG. , the ball 84 rides over the step 82c and flows toward the main spherical surface 82a. In this case, as the push state of the button 83a is released, the microswitch 83 electrically cuts off the R, S, and T lines and the driving motor 10 to stop the submersible pump 100.

That is, normal operation is possible even when the submersible pump 100 is slightly inclined in the vertical direction due to vibration or shock caused by the water flow during drainage work by the inclined interlocking operation unit 80, and it is in a draining state when it falls and is severely tilted. It is possible to automatically stop the operation of the submersible pump 100 when it becomes difficult.

5 is a diagram for explaining the configuration of the warning unit of FIG. 1;

The three-phase submersible pump 100 of the present invention further includes a warning unit 90 that informs the outside that leakage current occurs when leakage current occurs in at least one of R, S, and T lines.

The warning unit 90 is installed in the receiving space 41 and is installed between the first, second, and third ground distributors 52, 62, and 72 and the pump housing 20, and leaks when leakage current is generated. A leakage current detection sensor 91 generating a current signal, an LED 92 installed inside the receiving space 41 so as to face the transparent window 42, and the LED 92 interlocked when a leakage current signal is generated. ) and a blinking operation unit 93 for blinking. At this time, the LED is a high-brightness LED, and it is preferable that red and blue colors are alternately generated. By this warning unit 90, when leakage current occurs in at least one of the R, S, and T lines, the leakage current is notified to the outside through a flickering light. At this time, since the flickering light passes through the inside of the water, even if the submersible pump 100 is located at the depth of the work site, the flickering light can be confirmed from outside the work site.

For example, when the first leakage current is generated in the R line, the first leakage current shielding unit 50 sends the first leakage current to the N line through the first ground divider 52, and the warning unit 90 The leakage current detection sensor 91 detects the first leakage current flowing through the N line, and the blinking operation unit 94 blinks the LED 92 in conjunction with this. Accordingly, since the flickering light of the flickering LED 92 is dispersed to the work site through the transparent window 42, the worker at work can detect this and confirm that leakage has occurred, so that an appropriate response can be taken.

According to this principle, even when the first and second leakage currents occur in the S and T lines, the warning unit 90 detects this and blinks the LED 92 to warn the worker at work of leakage current and at the same time enable appropriate action to be taken.

In this way, according to the present invention, by adopting the first, second, and third leakage current shielding parts 50, 60, and 70 embedded in the accommodation space 41 of the housing cap, the covering of the power cable C is Even if the 1st, 2nd, and 3rd leakage currents of 600V are generated according to the damage, by collecting the 1st, 2nd, and 3rd leakage currents and sending them through the N line, it is possible to prevent workers working in the surrounding field from being electrocuted.

In addition, by adopting the inclined interlocking operation unit 80, when the submersible pump 100 falls and tilts, power applied to the drive motor 10 can be automatically cut off, thereby preventing the submersible pump from malfunctioning.

In addition, since the first, second, and third leakage current shielding units 50, 60, and 70 and the inclined interlocking operation unit 80 are embedded in the housing cap 40, they are dispatched with various structures during drainage work and are damaged. that can be prevented

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

100 ... submersible pump 10 ... drive motor
20 ... pump housing 30 ... pump chamber
40 ... housing cap 41 ... receiving space
42 .. transparent window 50 ... first leakage current shielding unit
51 ... 1st modulated wave number generator 52 ... 1st ground distributor
60 ... second leakage current shielding unit 61 ... second modulation wave number generating unit
62 ... 2nd ground distributor 70 ... 3rd leakage current shield
71 ... 3rd modulated wave number generator 72 ... 3rd ground distributor
80 ... inclined interlocking movement part 81 ... case
82 ... spherical surface 82a ... main spherical surface
82b ... subspherical surface 82c ... stepped
83 ... micro switch 83a ... button
84 ... ball 90 ... warning part
91 ... leakage current detection sensor 92 ... LED
93 ... flashing operation unit

Claims (7)

It is connected to a power cable (C) consisting of R, T, S, and N lines, and a drive motor 10 operated by three-phase power supplied through the R, T, and S lines is built-in, and the N line is A pump housing 20 that is grounded;
A pump chamber 30 installed at the lower side of the pump housing 20 and sucking and discharging water by the impeller 33 rotated by the driving motor 10;
a housing cap 40 coupled to the upper side of the pump housing 20 and having an accommodation space 41 therein;
a first leakage current shielding unit 50 built into the accommodating space 41 and flowing the first leakage current through the N line when the first leakage current is generated through the R line;
a second leakage current shielding unit (60) built into the accommodating space (41) and passing the second leakage current through the N line when the second leakage current is generated through the S line; and
A third leakage current shield 70 built into the accommodating space 41 and flowing the third leakage current through the N line when the third leakage current is generated through the T line; includes,
The first leakage current shielding unit 50 generates a first modulation frequency for compensating the frequency so that the potential difference of the first leakage current is zero potential when the first leakage current is generated in the R line. It includes a frequency generator 51 and a first ground divider 52 for flowing a first leakage current corresponding to the first modulation frequency to the N line grounded to the pump housing 20;
The second leakage current shielding unit 60 generates a second modulation frequency for compensating the frequency so that the potential difference of the second leakage current is zero potential when the second leakage current is generated in the S line. It includes a frequency generator 61 and a second ground divider 62 for flowing a second leakage current corresponding to the second modulation frequency to the N line grounded to the pump housing 20;
The third leakage current shielding unit 70 generates a third modulation frequency for compensating the frequency so that the potential difference of the third leakage current is zero potential when the third leakage current is generated in the T line. A frequency generator 71 and a third grounding distributor 72 for flowing the third leakage current corresponding to the third modulation frequency to the N line grounded to the pump housing 20; characterized in that A three-phase submersible pump with a leakage current shielding function. delete According to claim 1,
It is built in the accommodation space 41 of the housing cap 40, and supplies power to the drive motor 10 when the pump housing 20 and the pump chamber 30 face in the vertical direction (gravity direction), The three-phase submersible pump having a leakage current shielding function, characterized in that it further comprises a tilt interlocking operation unit 80 that cuts off power applied to the drive motor 10 when it falls and tilts. The method of claim 3, wherein the inclined interlocking operation unit 80,
a case 81 fixed to the ceiling of the housing cap 40 inside the accommodation space 41;
a spherical surface 82 formed inside the case 81 to open upward;
a micro switch 83 installed on the bottom of the spherical surface 82 and having a button 83a protruding upward from the central bottom surface of the spherical surface 82;
When the pump housing 20 faces the vertical direction, it is located at the center of the spherical surface 82 and pushes the button 83a, and when the pump housing 20 is tilted, it moves away from the center of the spherical surface 82. A three-phase submersible pump having a leakage current shielding function, characterized in that it includes; a ball 84 for releasing the push of the button 83a. The method of claim 4, wherein the spherical surface (82),
A main spherical surface 82a formed to be open to the upper side of the case 81;
It is formed at the center of the bottom of the main spherical surface 82a and includes a sub-spherical surface 82b having a greater curvature than the main spherical surface 82a so that a discontinuous step 82c is formed, leakage current shielding function A three-phase submersible pump with According to claim 1,
It is built into the accommodation space 41, and further includes a warning unit 90 that informs the outside that leakage current occurs when leakage current occurs in at least one of the R line, S line, and T line. A three-phase submersible pump having a leakage current shielding function. The method of claim 6, wherein the warning unit 90,
Built in the accommodation space 41 and installed between the first, second, and third ground distributors 52, 62, 72 and the pump housing 20 to generate a leakage current signal when leakage current occurs A leakage current detection sensor 91,
An LED 92 installed inside the accommodation space 41 to face the transparent window 42 of the housing cap 40;
A three-phase submersible pump having a leakage current shielding function, characterized in that it includes a blinking operation unit 93 for blinking and lighting the LED 92 in conjunction when the leakage current signal is generated.

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