KR101549954B1 - Device for preventing reverse of canned mortor pump and reactor coolant pump having the same - Google Patents

Abstract

The present invention relates to a device for preventing reverse flow caused by reverse rotation of a CANNED MORTOR pump, which solves problems of noise and service life that may occur when the pump is used in an enclosed underwater environment, And an impeller (112) for generating a thrust by rotation, the operation member (110) being transported on an axis line, and an operation member A case part 120 for guiding the insertion of one side of the operation member 110 and rotating the operation member 110 integrally with the operation member 110 inserted into the case part 120, And a stop member 140 formed on an axis line of the actuating member 110 and interlocking with the actuating member 110 to prevent reverse rotation of the actuating member 110. [ And to the main reactor coolant pumps for applying them.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for preventing reverse rotation of a candle motor pump, and a main coolant pump for a nuclear reactor,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for preventing reverse rotation of a candle-motor-type pump that prevents reverse flow caused by reverse rotation of a main impeller installed in a cannulated port pump, and a main coolant pump for a nuclear reactor.

REACTOR COOLANT PUMPs in the reactor are mounted on a number of annular covers of the reactor to provide sufficient forced circulation flow to the reactor main coolant line to properly remove heat from the reactor core during normal operation of the nuclear power plant Is used.

The main coolant pump serves to circulate heated water from the core to the steam generator when the reactor is in normal operation.

Heat exchange occurs between the high temperature primary cooling water forced into the steam generator by the main coolant pump and the secondary cooling water flowing into the tube sheet.

Such a heat exchange method generates steam, the temperature of which is lowered, the primary cooling water whose temperature has been lowered is circulated back to the core and heated, and then has an operating cycle in which the primary coolant pump forcibly circulates the steam to the steam generator.

The reactor's main coolant pump consists of an AXIAL FLOW TYPE pump installed in the reactor. It has excellent cooling performance to prevent deterioration of the main coolant pump, low noise, A main cooling water pump of a candle motor type which is easy to prevent leakage of air is widely used.

The main coolant pump of the candemotor type is in direct contact with the primary coolant of the reactor, but is isolated from the outside, because all components are located in the pump body.

Further, the main coolant pump of the candle motor type has a structure in which the rotor of the electric motor and the rotating shaft are integrally coupled to each other so that there is no connection portion for power transmission.

The main coolant pump of these reactors is driven by a large number of coolants so that the coolant can flow without stopping even when one of them is stopped.

However, in the case of a stationary pump, the impeller reversely rotates as the flow rate is reversed by another pump.

If this reverse rotation occurs freely, the bypass flow rate of the first coolant becomes large and the flow rate of the coolant to be fed into the core is reduced, which is not good on the cooling side, and the motor rotates reversely even in the position of the pump, There is a problem that a device for preventing the reverse rotation of the main coolant pump is needed.

As a conventional technique that can be applied to prevent the reverse rotation of the main coolant pump, for example, there is a technique for preventing the reverse rotation of the impeller by connecting the clutch bearing to the rotation shaft.

However, when a clutch bearing is used, a lubrication is required, so that there is a limit in that the life time of the main coolant pump when it is applied to a candle motor type main coolant pump, in which the rotating shaft is driven in a water-

As a prior art that can be applied to prevent the reverse rotation of the main coolant pump, a submerged motor pump with a reverse rotation preventive device of Korean Patent No. 10-1068840 is mounted on the upper end of the electric motor part of the pump, And a braking device for preventing the reverse rotation of the impeller by compression-locking the lining and the disc plate together with the impeller rotating shaft.

The pump disclosed in Korean Patent Laid-Open No. 10-2013-0045300 "Pump equipped with detent device for preventing reverse rotation" is provided with a detent and a spring between a rotating plate rotating together on a drive shaft connected to a pump impeller, The detent which is urged in the reverse rotation direction by the spring when the reverse rotation of the drive shaft is generated travels along the detent detent guide groove having a narrow space in the direction of reverse rotation to separate the rotary plate, So as to prevent rotation of the impeller to prevent reverse rotation of the impeller.

In addition, as a prior art that can be applied to prevent the impeller from rotating backwards, the domestic integrated reactor SMART main coolant pump is installed at the lower end of the flow guide pipe for introducing the primary coolant into the impeller, And the upper weight balance weight and the lower weight balance weight are integrally fixed to the fluid distribution pipe at a predetermined angle, thereby preventing the primary coolant from flowing backward with the main coolant pump stopped at the time of emergency operation.

However, in Korean Patent No. 10-1068840, a chamber is formed inside a pump device so as to be connected to a rotating shaft rotated by an electric motor, so that the volume and size of the coolant pump are increased, and the solenoid port It is difficult to apply it to a coolant pump of a candle motor type in which the rotating shaft including the rotor of the motor is submerged in the coolant.

In addition, in the Japanese Laid-Open Patent Publication No. 10-2013-0045300, the detent for preventing reverse rotation inserted into the guide groove of the rotary plate contacts with the rotary plate and the guide groove by the pressing force of the spring even during the regular rotation of the rotary plate. There is a problem that noises are generated and the lifetime is deteriorated due to the continuous contact of the detent.

In addition, in Korean Patent No. 10-0558054, a separate device for preventing the backflow of the coolant is installed on the flow path through which the coolant flows, so that the differential pressure of the flow path is inevitably increased. When the foreign matter enters the flow path, So that it is difficult to recover the foreign matter.

Accordingly, the present invention can be applied to a reactor coolant pump to prevent a reverse rotation of an impeller while preventing noise from being generated and applied to a coolant pump of a candle motor type, Is the urgent need of development.

Korean Patent No. 10-1068840 Korean Patent Publication No. 10-2013-0045300 Korean Patent No. 10-0558054

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a structure for preventing back flow by reverse rotation of a candle motor pump on an internal flow path, Which is capable of solving the problem of deterioration of the service life and the problem of deterioration of the service life of the motor, and eliminating the need to provide a complicated structure for preventing reverse flow on the flow path of the candem motor pump, And an object of the present invention is to provide a main coolant pump of a nuclear reactor to which the present invention is applied.

In order to achieve the above object, according to the present invention, there is provided an apparatus for preventing reverse rotation of a canned mortar pump, comprising: an impeller for generating a thrust in one direction by rotation, A case part inserted into the case part and guided by the driving shaft of the main impeller so as to integrally rotate with the driving shaft of the main impeller, And a stop member provided on an axial line of the actuating member and having a second shape engaged with the first shape of the actuating member, An apparatus for preventing reverse rotation of a motor pump is provided.

According to another aspect of the present invention, a main impeller for forming an injection pressure of a main coolant pump of a candle motor reactor, and an electric motor and a drive shaft for transmitting a rotational force of the electric motor to the main impeller are simultaneously installed on a closed coolant flow path 1. A nuclear reactor main cooling pump of a candle motor type comprising: an operating member having an impeller for generating a thrust in one direction by rotation and being transported on an axis line, and having a first shape formed on an upper surface thereof; And an elastic member which is inserted in the inside of the case portion and supports the actuating member so as to apply an elastic force in a direction opposite to the direction in which the thrust acts, And an engaging member formed on an axis line of the actuating member and engaged with the first shape of the actuating member, The phase comprising a stationary member having preventing reverse rotation of the motor pump unit kaendeu the reactor main coolant pumps of kaendeu motor type is provided on the coolant channel is provided.

According to another aspect of the present invention, there is provided a method for preventing reverse rotation of a reactor main coolant pump, comprising the steps of: rotating an integrally rotating unit on the same axis as a main impeller forming a discharge pressure of a primary coolant, The impeller is formed on the circumferential axis of the member so that the operating member is transferred to the lower portion by the generation of thrust of the impeller for forward rotation of the main impeller, and when the rotation of the main impeller is stopped, And is returned to the upper portion by the action of the elastic member to prevent reverse rotation of the main impeller which is engaged with the stop member fixed on the upper portion of the operation member so as to prevent rotation in the reverse direction and rotates integrally with the operation member A method of preventing reverse rotation of a reactor main coolant pump is provided.

According to the apparatus for preventing reverse rotation of the candle motor pump according to the present invention, by using only the rotational force for driving the main impeller and the elastic force of the elastic member, the main impeller is prevented from rotating backward when stopped, , It is possible to prevent the reverse rotation of the cand motor pump by a simple operation.

Therefore, according to the main coolant pump of the nuclear reactor to which the apparatus for preventing reverse rotation of the candem motor pump is applied, it is possible to prevent the back flow of the main coolant pump even in an emergency where supply of power is difficult and safety of the main coolant system can be improved .

Further, according to the reactor main coolant pump to which the apparatus for preventing reverse rotation of the candem motor pump and the apparatus for preventing reverse rotation of the candemap pump according to the present invention are applied, it is possible to prevent the problem of noise and life- There is an effect that the reverse rotation of the main impeller can be promptly prevented by the simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a combined shape of a reverse rotation prevention device according to an embodiment of the present invention; FIG.
Fig. 2 is a perspective view showing a disassembled shape of the anti-reverse device shown in Fig. 1. Fig.
3 is a cross-sectional view showing one end surface of the anti-reverse rotation device shown in Fig.
Fig. 4 is a cross-sectional view showing an engagement portion AB between the operation member and the case portion shown in Fig. 3;
5 is a conceptual view showing a normal operation state of the anti-reverse device according to the present embodiment.
6 is a cross-sectional view showing the normal operation state shown in Fig.
7 is a conceptual view showing a state of the anti-reverse rotation device according to the present embodiment at the time of preventing reverse rotation.
8 is a cross-sectional view showing a reactor main coolant pump installed in a reactor according to another embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing reverse rotation mounted on a main coolant pump of a reactor to which a candle motor type pump or a candle motor type is applied, and a main coolant pump for a nuclear reactor employing the same.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The exemplary embodiments of the present invention may be embodied in many different forms by those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments described in the foregoing.

Fig. 1 shows the combined shape of the anti-reverse rotation device 10 according to an embodiment of the present invention.

1, an anti-reverse rotation device 10 according to an embodiment of the present invention includes an operation member 110 having an impeller 112, An elastic member 130 for elastically supporting the actuating member 110 in the case 120 and a stopper 130 for engaging with the upper surface on the axial line of the actuating member 110, Member (140).

The operation member 110 is configured such that the rotation is transmitted from the power source to rotate, and the impeller 112 is formed at one circumferential portion to rotate integrally.

The impeller 112 formed on the operation member 110 is composed of a plurality of blades and generates thrust by rotation to move the integrally formed operation member 110 to the lower side of the axial line, The lower part of the operation member 110 is guided while being inserted into one side of the case part 120. [

Fig. 2 shows an exploded view of the anti-reverse device 10 shown in Fig. 1, and Fig. 3 shows a cross section of the anti-reverse device 10 shown in Fig. The configuration of the reverse rotation prevention device 10 will be described in more detail.

As shown in FIG. 2, the casing 120 is formed in a cylindrical shape having a hollow portion penetrating vertically through the inside thereof. One side of the actuating member 110 is inserted into the upper portion of the casing 120, and the lower portion is integrally formed with the main impeller 112 And one side of the driving shaft 310 is coupled.

For example, the case 120 includes a shaft insertion hole 126 into which a side of the drive shaft 310 extending from the main impeller 112 can be inserted, A plurality of shaft fastening portions 128 may be formed to allow the engaging members 312 (see FIG.

Thus, the case 120 is integrally rotatable with the drive shaft 310, and is rotated integrally with the main impeller 112.

An engaging end 124 is formed at an upper portion of the case 120 to prevent the operation member 110 from being separated from the case 120. A lower portion of the operation member 110, The engaging portion 116 is formed so as to be caught by the engaging end 124 of the portion 120 and prevented from being separated.

2 and 3, a plurality of feed slots 122 are formed on the inner side surface of the case part 120 so as to extend in the axial direction and inserted into the periphery of the actuating member 110 A slot groove 118 for inserting the transfer slot 122 of the casing 120 in the axial direction is formed in the periphery of the actuating member 110 corresponding to the transfer slot 122, The operation member 110 is coupled to the inside of the unit 120 so that the rotation of the case unit 120 is transmitted to the operation member 110 so as to integrally rotate the operation member 110 while sliding the operation member 110 upward and downward.

Fig. 4 shows a cross section of a portion A-B where the actuating member 110 and case 120 shown in Fig. 3 are joined.

4, the transfer slot 122 formed in the case 120 and the slot groove 118 formed in the operation member 110 are formed in a circular shape of the case 120 and the operation member 110 But the present invention is not limited thereto. The operation member 110 may be moved in the axial direction by the coupling of the feed slot 122 and the slot groove 118, It can be configured to have various numbers and intervals so as to be transmitted.

In this case, it is preferable that the slot groove 118 formed in the operation member 110 is formed at the periphery of the locking part 116 inserted into the inner side of the case part 120.

1 to 3, the upper portion on the axial line formed by the actuating member 110 is fixedly installed inside the candle motor and is selectively in close contact with the upper surface of the actuating member 110, A stop member 140 for preventing rotation of the operation member 110 in one direction is formed.

For this purpose, stoppers 114a and 114b are formed on the lower surface of the stop member 140 and the upper surface of the actuating member 110, respectively, and the stoppers 114a and 114b, When the actuating member 110 rotates in the reverse direction, the ends formed perpendicular to both sides of the actuating member 110 are engaged with each other, And the rotation of the operation member 110 is blocked by the stop member 140 fixed to the inside of the motor.

The lower end of the actuating member 110 inserted into the case 120 is elastically supported by an elastic member 130 provided inside the case 120.

The elastic member 130 is inserted into the lower portion of the case 120 so that the upper end of the elastic member 130 is in direct contact with the lower end of the operation member 110. The elastic member 130 is provided on the inner surface of the lower side of the case 120, The elastic member 130 is pressed by the lower movement of the actuating member 110 to form a repulsive force acting on the actuating member 110.

At this time, the elastic member 130 supporting the actuating member 110 may be constituted by a coil spring.

3 shows a state in which the main impeller (not shown) of the candle motor pump is not driven. When the rotation of the operation member 110, which is rotated and stopped integrally with the main impeller, is stopped, The upper surface is brought into close contact with the stop member 140 by the pressing force of the elastic member 130 installed at the lower portion.

In this state, when the main impeller 112 is rotated in the forward direction by driving the candle motor pump, a rotational force is transmitted to the actuating member 110 to integrally rotate the impeller 112 formed on the periphery of the impeller 112, The actuating member 110 moves downward and is separated from the stopper 140 in a state in which the elastic member 130 is pressed to release the close contact.

Hereinafter, the operation of the anti-reverse device according to the present embodiment will be described in detail with reference to the accompanying drawings.

5 shows a state in which the actuating member 110 of the anti-reverse rotation device 10 according to the present embodiment is rotating, and Fig. 6 shows a cross section of the state shown in Fig.

5 and 6, the operation member 110 of the anti-reverse rotation device 10 according to the present embodiment applies power to an electric motor (not shown) for operation of the candle motor pump A rotational force for rotating the main impeller is transmitted to the operating member 110 through the case unit 120 so that the main impeller is integrally rotated.

When the operating member 110 rotates, the impeller 112 formed on the periphery rotates to generate a thrust force to move the entire operation member 110 downward. In the lower portion of the case 120, The elastic member 130 is moved to the lower side.

5 and 6, the upper end portion of the operation member 110 is spaced from the upper end portion of the stop member 140 by a predetermined distance, as shown in FIGS. 5 and 6, by continuously generating a downward thrust by the rotation of the operation member 110 And the rotation is maintained in unison with the main impeller.

7 shows a state where the rotation of the operation member of the reverse rotation prevention device according to the present embodiment is blocked.

As shown in FIG. 7, when the power supplied to the electric motor of the candle motor pump is cut off and the driving of the main impeller is stopped, the operation member 110 is stopped as a whole and the generation of the thrust by the impeller 112 is canceled And is returned to the upper part by the elastic member 130 provided at the lower part of the case part 120 and is brought into close contact with the lower end surface of the stop member 140 provided with the upper end surface.

The engaging protrusion 114a formed on the upper end surface of the operation member 110 and the engaging protrusion 114b formed on the lower end surface of the stop member 140 are engaged with each other to prevent the operation member 110 from rotating in the reverse direction, The main impeller rotating integrally with the operation member 110 is prevented from rotating in the reverse direction.

According to the above-described operation, when the rotation of the main impeller of the candle motor pump is stopped, the operation member 110 moves to the elastic force of the elastic member 130 Thereby preventing the backward rotation of the main impeller, thereby preventing backflow of the fluid.

Particularly, the anti-reverse rotation device 10 according to the present embodiment can prevent the reverse rotation of the main impeller by using the thrust of the impeller 112 and the elastic force of the elastic member 130 without supplying a separate power source Thus, stable operation is possible even in an emergency where power supply is difficult.

When the jaws 11a formed on the upper end surface of the operation member 110 are engaged with the jaws 114b formed on the lower end surface of the stop member 140 and the candle motor pump is operated again in the forward direction, And enables rotation of the operation member 110 in the normal direction by the action of the jaws 114a and 114b.

As a result, after the actuating member 110 reaches a certain rotational speed, it can be separated from the stop member 140 by the generation of thrust, thereby minimizing the contact between the engaging jaws 114a and 114b on both sides, And the like.

In particular, in the case of the actuating member 110, driving is performed in the fluid in the closed space of the candle motor pump, so there is no fear of noise generation, and the existing life span degradation phenomenon can be also improved.

According to another aspect of the present invention, there is provided a main coolant pump for a nuclear reactor provided with the above-described device (10) for preventing reverse rotation of a candle motor pump.

8 shows a state where the reactor main coolant pump of the present invention is installed in a reactor.

8, a main coolant pump according to an embodiment of the present invention is installed at an upper portion of a nuclear reactor 800 and has a vertical structure for injecting and circulating a primary coolant therein. A main impeller 810 for forming an injection pressure of the electric motor 820 and a drive shaft 31 for transmitting the rotational force of the electric motor to an electric motor (not shown) and a main impeller 810 As shown in FIG.

Particularly, the main impeller 820 is formed in a lower portion adjacent to the diffuser formed in the lower portion of the main coolant pump 820 and leading to the interior of the reactor, and an electric motor can be installed on one side of the same axis as the main impeller 820 .

For example, the main coolant pump 820 according to the present embodiment may be composed of a vertical operation type candle motor type pump installed vertically to the pump nozzle formed in the cover 840 of the upper reactor to forcibly circulate the primary coolant.

The main coolant pump 820 is formed therein and a flow path guide pipe 830 for introducing the primary coolant into the inside of the reactor 800 is formed and operated by an electric motor at a lower side of the flow path guide pipe 830 A main impeller 810 for forming discharge pressure of the primary coolant is installed and the anti-reverse rotation device 10 according to the above-described embodiment is installed so as to integrally rotate on the same axis of the main impeller 810.

The main coolant pump 820 of the reactor according to the present embodiment is the same as the existing structures except for the configuration of the anti-reverse rotation device 10, and is not limited to the specific structure, . ≪ / RTI >

Further, according to another aspect of the present invention, a method of preventing the reverse rotation of the reactor main coolant pump can be provided.

According to the present embodiment, there is provided a method of preventing reverse rotation of a reactor main coolant pump, comprising the steps of: providing an operation member (110) rotating integrally on the same axis as a main impeller forming a discharge pressure of a primary coolant, The impeller 112 is formed on the circumferential axis of the impeller 112 so that the operation member 110 is moved downward by the generation of thrust of the impeller 112 for forward rotation of the main impeller, The stop member 140 fixed to the upper portion of the operation member 110 is prevented from rotating in the reverse direction by returning to the upper position by the action of the elastic member 130 There is provided a method for preventing reverse rotation of a reactor main coolant pump that is engaged to prevent reverse rotation of the main impeller rotating integrally with the operation member (110).

The method of preventing the reverse rotation of the reactor main coolant pump of the present embodiment can be performed by using the main coolant pump of the reactor described above, and the specific operation and operation thereof will be omitted below to avoid redundant description.

According to the reactor main pump of the present invention and the method of preventing reverse rotation of the main coolant pump of the reactor, the main coolant pump stopped by the pressure of the main coolant pump, It is possible to prevent deterioration of the cooling efficiency by preventing the primary coolant from flowing backward by rotating in the reverse direction and preventing the electric motor from being adversely affected by reverse rotation of the main coolant pump, have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

10: Anti-reverse device
110: operating member
112: impeller
114a, 114b:
118: Slot home
120: Case portion
122: Feed Slot
130: elastic member
140: stop member
310: drive shaft

Claims (11)

An operating member having an impeller for generating a thrust in one direction by rotation and being transported on an axis line and having a first engaging step formed on an upper surface thereof;
A case part inserted into one side of the operation member to guide the movement and coupled to a drive shaft of the main impeller to integrally rotate the operation member;
An elastic member inserted into the case portion and supporting the operation member to apply an elastic force in a direction opposite to the direction in which the thrust acts; And
A stop member provided on an axis line of the operation member and having a second stopping jaw which engages with the first stopping jaw of the operation member;
And a reverse rotation prevention device of the candle motor pump.
The method according to claim 1,
Wherein the engaging portion is formed at an inner side of an end portion of the case portion into which the operation member is inserted and an engaging portion is formed at one end of the operation member to prevent the releasing of the engaging portion from being caught by the engaging end. .
3. The method of claim 2,
A slot formed in the inner side surface of the case part to extend in the axial direction and to be inserted into the slot part of the locking part in the axial direction so as to be slid and to be integrally rotated with the case part A device for preventing reverse rotation of a candle motor pump.
The method of claim 3,
And a support step for supporting and supporting one end of the elastic member which is not in contact with the operation member is formed at a lower portion of the inner side surface of the case part.
The method according to claim 1,
When the actuating member is rotated in the forward direction, the beveled surface of the first engaging jaw and the second engaging jaw abuts the beveled surface to enable rotation of the actuating member, and when the actuating member is rotated in the reverse direction, the first engaging jaw and the second engaging jaw And the jaws are engaged to prevent rotation of the candle motor pump.
delete The method according to claim 1,
Wherein the case portion is formed of a hollow shaft having an inner side penetrated therethrough and has a shaft insertion hole for inserting the drive shaft into an opposite end portion into which the operation member is inserted, and a coupling member is inserted into one side of the shaft insertion hole, And a shaft fastening part for fastening the fastening part to the fastening part.
The method according to claim 1,
Wherein the elastic member is a coil spring.
A cannulated motor type reactor in which a main impeller for forming an injection pressure of a reactor main cooling pump and a drive shaft for transmitting a rotational force of the electric motor to the main impeller are simultaneously installed on a closed coolant flow path, In the main coolant pump,
A canned motor type reactor main coolant pump in which a device for preventing reverse rotation of a candle motor pump according to any one of claims 1 to 5 is provided on the coolant flow path.
10. The method of claim 9,
Wherein the apparatus for preventing reverse rotation of the candem motor pump is installed on an upper portion coaxial with the main impeller.
A method for preventing reverse rotation of a candle motor type reactor coolant pump,
An impeller is formed on a peripheral axis of an operating member that rotates integrally with the main impeller coaxially with the main impeller forming the discharge pressure of the primary coolant introduced into the reactor, The operation member is moved downward,
When the rotation of the main impeller is stopped, the thrust generation of the operating member is extinguished and returned to the upper portion by the action of the elastic member, so that the stop member fixed to the upper portion of the operating member is engaged with the stop member, Wherein the main impeller rotates together with the main impeller to prevent reverse rotation of the main impeller.

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