KR101273512B1 - Hermetic underwater pump with preventing water hammer - Google Patents

Abstract

The present invention relates to an enclosed submersible pump having a water hammer prevention structure, and an object thereof is defined by a partition wall of a motor chamber and a pumping chamber, and a flywheel for preventing water hammer is provided in the pumping chamber, and an electromagnet provided in the motor chamber. The flywheel provided in the pumping chamber is bound by magnetic force so that the power of the motor is transmitted to the impeller, so that the water hammer can effectively prevent damage to the pump or pipes caused by water hammer and damage to the motor due to leakage. It is to provide a sealed submersible pump having a prevention structure. The submersible pump of the present invention for this purpose is connected to the motor, through the rotating shaft and the impeller to suck and discharge the fluid while rotating, in the submersible pump comprising a housing for accommodating the motor and the impeller, the housing, the motor And a pumping chamber in which an impeller is installed is partitioned by partition walls to form an independent space. The rotating shaft includes a first rotating shaft installed in the motor chamber and connected to the motor, and an impeller installed in the pumping chamber. The second rotary shaft is composed of a second rotary shaft connected to the magnetic block is installed on the first rotary shaft, the flywheel which is bound by the magnetic block and the magnetic force receives power and maintains the rotational inertia of the rotary shaft to prevent water hammer It is configured to be installed on.

Description

Hermetic underwater pump with preventing water hammer

The present invention relates to a submersible pump, and in particular, the motor chamber and the pumping chamber are partitioned by partition walls, and a flywheel for preventing water hammer is provided in the pumping chamber, and an electromagnet provided in the motor chamber and a flywheel provided in the pumping chamber are Bound by magnetic force, the power of the motor is transmitted to the impeller, so that it can effectively prevent the damage of the pump or pipes caused by water hammer and the damage of the motor by water leakage. It is about.

A pump is a device that sucks or moves a liquid or gas. A pump that sucks water from an inlet and discharges water through an outlet using a pressure difference caused by rotation of an impeller provided therein is generally used. have.

On the other hand, when the pump is stopped or the pump is stopped suddenly due to a power failure during normal operation, or when the opening degree of the valve is changed rapidly, the flow rate in the water supply line changes rapidly and the pressure increases or decreases. Fluid transients will occur. When the pressure wave reciprocates between the upstream end and the downstream end due to the sudden flow rate change in the pipeline, the pressure in the pipeline falls below the saturated steam pressure of the water according to the pipeline shape, resulting in the formation of vapor cavity, resulting in column separation. Phenomenon occurs. If the pressure in the pipeline is lower than atmospheric pressure, it may cause buckling in the pipeline, and high pressure is generated when the water column separated by the steam cavity recombines, causing the pipeline to be damaged.

Looking at the damage caused by such a water hammer, when the power of the pump is suddenly cut off, the pump motor is accelerated to reverse rotation due to the reverse flow of water flow, and an accident may occur, and the pump, The valves, pipelines, and other facilities may be damaged by damage, or the pipelines may collapse due to pressure rise and drop in the pipelines, or water column separation may occur. In addition, due to the periodic pressure fluctuations in the pipeline, it is difficult to accurately control the pressure in the automatic control system, and even the structure may be broken.

In order to prevent the damage caused by the water hammer, a flywheel is installed on the rotational axis of the pump to drive a stationary pump, or when the pump suddenly stops, the flywheel maintains the rotational inertia of the rotational axis connected to the impeller. The pump is driven or stopped slowly to prevent the occurrence of water hammer.

As described above, a general pump prevents water hammer by using a fly wheel. However, in the case of an underwater pump, since the entire pump is installed to be submerged in water, it is not easy to install the fly wheel. There is a problem that is difficult to cope.

On the other hand, Patent Publication No. 2007-0006404 discloses an underwater motor pump having a water hammer prevention means.

The submersible motor pump prevents damage caused by water hammer by using a bypass valve and a flywheel. A cover bracket is additionally installed at an upper end of the pump to install the flywheel. A fly wheel is installed in the space provided, and the fly wheel is configured to rotate in combination with a fly wheel shaft installed to extend from a shaft connected with the impeller.

The submersible motor pump as described above has the advantage of preventing water hammer since the rotational inertia of the shaft is extended by the flywheel, but the volume of the pump is increased due to the additional installation of the cover bracket for the installation of the flywheel. Due to this, there is a problem in that it is not easy to install underwater and receives a lot of resistance in the water.

In addition, in the conventional submersible pump, a mechanical seal is installed between the rotating shaft and the housing to block water from entering the motor through a gap between the rotating shaft and the housing, but the watertightness is deteriorated due to wear or damage of the mechanical seal. If it is, there is a big problem that the water is introduced into the space in which the motor is installed to damage the motor.

The present invention has been made in consideration of the above problems, and an object of the present invention is to partition the motor chamber and the pumping chamber in which the impeller is installed, into partitions to form independent spaces, and are arranged in the motor chamber and the pumping chamber, respectively. It is to provide a sealed submersible pump having a water hammer prevention structure that can effectively prevent the damage of the motor due to leakage by allowing the two rotating shafts to be coupled to each other by the magnetic force to transmit the power of the motor to the impeller.

Another object of the present invention is to install a flywheel for preventing water hammer phenomenon on the rotating shaft provided in the pumping chamber, and the electromagnet which is selectively bound by the flywheel and the magnetic force is installed on the rotating shaft provided in the motor chamber pump by water hammer phenomenon (B) providing a sealed submersible pump having a water hammer preventing structure to effectively prevent damage to the pipes and damage to the motor due to leakage.

The hermetic submersible pump having the water hammering prevention structure of the present invention, which achieves the object as described above and removes the drawbacks of the related art, is connected to the motor through the rotating shaft with the motor to suck and discharge the fluid. An underwater pump comprising an impeller and a housing for accommodating the motor and the impeller, wherein the housing is configured such that the motor chamber in which the motor is configured and the pumping chamber in which the impeller is installed are partitioned by partitions to form an independent space. The rotating shaft includes a first rotating shaft installed in the motor chamber and connected to the motor, and a second rotating shaft installed in the pumping chamber and connected to the impeller, and a magnetic block is installed on the first rotating shaft, and is bound by the magnetic block and the magnetic force. The flywheel is installed on the second rotating shaft to receive power and to maintain the rotational inertia of the rotating shaft to prevent water hammer. The magnet block is composed of an electromagnet and is characterized in that the magnet block and the flywheel are selectively coupled.

On the other hand, the magnetic block is preferably configured to be magnetized by receiving power when the power is applied to the motor.

On the other hand, the flywheel may be composed of laminated silicon steel sheet so that the residual magnetic.

According to the present invention having the characteristics as described above, since the motor chamber and the pumping chamber are partitioned by the partition wall and configured in an independent structure, water can be blocked from being introduced into the interior of the motor chamber, thereby preventing damage to the motor due to leakage. It can work.

In addition, the flywheel installed on the second rotating shaft of the pumping chamber maintains the rotational inertia of the rotating shaft and the impeller for a predetermined time has the effect of preventing damage caused by water hammer.

In addition, when the magnetic block composed of electromagnets is magnetized only when the motor is driven to bind with the fly wheel, and suddenly the driving of the pump is stopped, the binding of the magnetic block and the fly wheel is released to prevent damage to the motor due to sudden increase in the load of the motor. There is an effect that can be prevented.

In addition, the flywheel is made of silicon steel sheet with few residual magnets, so that the fastening and releasing of the magnet block and the flywheel can be performed, thereby ensuring a smoother working structure.

1 is a view showing the structure of a submersible pump according to a preferred embodiment of the present invention,
2 is a diagram illustrating a structure of a magnet block composed of an electromagnet;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view showing the structure of an underwater pump according to a preferred embodiment of the present invention.

The submersible pump according to the present invention, like a known submersible pump, is connected via a motor 110, the motor 110 and the rotating shaft 120, and an impeller 130 for sucking and discharging fluid while rotating the motor ( Consists of a housing 140 for receiving 110 and the impeller 130.

However, in the water pump according to the present invention, the housing 140 is composed of a motor chamber 141 and a pumping chamber 142 having independent structures, respectively, so that the fluid in the pumping chamber 142 flows into the motor chamber 141. Features to prevent damage to the motor 110 due to leakage by blocking the source, the first and second rotary shafts 121 and 122 are installed in the motor shaft 141 and the pumping chamber 142, respectively, the rotary shaft 120 In this case, the magnetic block 150 and the flywheel 160 are respectively installed on the first rotation shaft 121 and the second rotation shaft 122, and the motor chamber 141 and the pumping chamber 142 are partitioned. In the structure, while the power of the motor 110 is effectively transmitted to the impeller 130 has a feature to prevent the occurrence of water hammer by extending the rotational inertia of the rotary shaft 120 using the flywheel 160.

It will be described in detail with respect to the structure of the submersible pump according to the invention having the above characteristics.

The housing 140 is composed of a single body, the motor chamber 141 is provided at the upper end, the pumping chamber 142 is provided at the lower end, the motor chamber 141 and the pumping chamber 142 is partition wall 143 It is configured to be completely partitioned by to form an independent space. In this case, the pumping chamber 142 is formed with an inlet 141a through which water is introduced and an outlet 142b through which water is discharged.

On the other hand, the motor 110 is configured in the motor chamber 141, and the motor 110 is composed of the rotor 111 and the stator 112, as is known, the rotor by the power applied to the stator 112 As the 111 is rotated, the rotating shaft 120 is rotated.

The rotary shaft 120 is disposed in the motor chamber 141 and the first rotary shaft 121 connected to the motor 110, and the second rotary shaft 122 disposed in the pumping chamber 142 and connected to the impeller 130. In this case, the first rotary shaft 121 and the second rotary shaft 122 is disposed on the same vertical line.

On the other hand, the magnetic block 150 is installed on the first rotating shaft 121, the magnetic block 150 is coupled to the second rotating shaft 122 by the magnetic force, and when the driving of the pump starts or stops the rotation shaft ( The flywheel 160 is installed to maintain the rotational inertia of the 120 for a predetermined time to prevent the occurrence of water hammer.

In this case, the magnet block 150 and the flywheel 160 are respectively installed at the lower end and the upper end of the first rotation shaft 121 and the second rotation shaft 122 so as to face each other with the partition wall 143 interposed therebetween, and the magnetic block 150. As the magnetic block 150 and the flywheel 160 are coupled with the partition wall 143 interposed by the magnetic force generated by), the rotational force generated by the driving of the motor 110 is the first rotation shaft 121 → the magnet. The block 150 is transmitted to the impeller 130 through the flywheel 160 and the second rotational shaft 122.

On the other hand, the magnet block 150 may be composed of a permanent magnet, it is preferably composed of an electromagnet for selectively generating a magnetic force in conjunction with the drive of the motor 110.

FIG. 2 is a diagram illustrating a structure of a magnetic block composed of an electromagnet.

When the magnet block 150 is composed of an electromagnet, it may be configured as follows to apply power to the magnet block 150 that rotates together with the first rotation shaft 121.

Both ends 152a and 152b of the coil 152 wound on the iron core 151 protrude to the outer circumferential surface of the iron core 151, and thus both ends 152a and 152b of the coil 152 protrude to the outer circumferential surface of the iron core 151. ) Is connected to the slip ring 153 is fixed to the motor chamber 141 is configured to be magnetized by receiving power through the slip ring 153 during the rotation of the magnet block 150. Meanwhile, since the slip ring 153 is a well-known technique used to maintain an electrical contact with the rotating member, a detailed description of the slip ring will be omitted.

As such, the magnet block 150 composed of an electromagnet is magnetized by being supplied with power when the power is applied to the motor 110 to drive the motor 110, and is coupled to the fly wheel 160. When the power supplied to the motor 110 for the stop is cut off, the power supplied to the magnet block 150 is also cut so that the binding with the flywheel 160 is released.

It will be described for the effect of the hermetic submersible pump having a water hammer prevention structure of the present invention configured as described above.

Sealed submersible pump having a water hammer prevention structure according to the present invention is the motor chamber 141 and the pumping chamber 142 is partitioned by the partition wall 143 is connected to the rotating shaft 120 connecting the motor 110 and the impeller 130 There is no risk of leakage through, there is no risk of damage to the motor 110 by the leakage.

On the other hand, the first rotation shaft 121 and the second rotation shaft 122 respectively installed in the motor chamber 141 and the pumping chamber 142 partitioned by the partition wall 143 are coupled to the magnet block 150 and the flywheel 160. By the power transmission is connected by the structure, the flywheel 160 is to prevent the occurrence of water hammer by maintaining the rotational inertia of the rotary shaft 120.

On the other hand, when the magnetic block 150 is composed of a permanent magnet, the magnetic block 150 installed on the lower end of the first rotary shaft 121 and the flywheel 160 provided on the upper end of the second rotary shaft 122 are bound by magnetic force. Will remain intact.

When power is applied to the motor 110 to drive the pump to drive the motor 110, the first rotating shaft 121 and the magnet block 150 is rotated, and is coupled to the magnet block 150 by magnetic force As the flywheel 160 rotates and rotates the second rotary shaft 122, the impeller 130 is rotated, and the fluid is transferred by the rotation of the impeller 130.

When the motor 110 is initially driven, the flywheel 160 maintains the inertia of the stationary rotating shaft 120 for a predetermined time to prevent the water hammer by rotating the rotating shaft 120 and the impeller 130 slowly. It becomes possible.

In addition, even when the motor 110 is stopped, the rotational inertia of the rotation shaft 120 is maintained for a predetermined time by the flywheel 160 installed on the second rotation shaft 122, so that the rotation shaft 120 and the impeller 130 are gradually stopped. This prevents water hammer.

On the other hand, when the magnet block 150 is composed of an electromagnet, the binding between the magnet block 150 and the flywheel 160 is released normally, the first rotation shaft 121 and the second rotation shaft 122 is blocked transmission of power State is maintained.

On the other hand, when the power is applied to the motor 110 to drive the pump, the power is also applied to the slip ring 153 provided on the magnet block 150, at this time to maintain an electrical contact with the slip ring 153 As the electromagnet is magnetized, the magnetic block of the magnet block 150 and the flywheel 160 is made, and the second rotary shaft 122 and the impeller 130 are formed by the magnet block 150 and the flywheel 160. By rotating the fluid is transferred.

Of course, as the inertia of the rotation shaft 120 is maintained by the flywheel 160 for a predetermined time during the initial driving of the motor 110 as described above it is possible to prevent the water hammer.

Meanwhile, when the power applied to the motor 110 is cut off to stop the pump, as the power applied to the magnet block 150 is also cut off, the binding between the magnet block 150 and the flywheel 160 is released. The second rotation shaft 122 and the impeller 130 are gradually stopped by the flywheel 160 installed on the second rotation shaft 122 to prevent the occurrence of water hammer, and also damage to the motor 110 due to the sudden stop. There is an advantage that can be prevented.

In addition, the flywheel 160 is configured by stacking silicon steel sheets so that residual magnetism is small, so that the binding between the magnet block 150 and the flywheel 160 can be released quickly. As shown in FIG. It is preferable to put it so that there is no change of position at the time of rotation.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
110: motor 111: rotor
(112): Stator 120: axis of rotation
(121): first axis of rotation (122): second axis of rotation
130: impeller 140: housing
(141): motor room (142): pumping room
(143): bulkhead (150): magnetic block
160: Fly Wheel

Claims (4)

A motor 140, an impeller 130 connected to and connected with the motor 110 and the rotating shaft 120 to suck and discharge fluid while rotating, and a housing 140 to accommodate the motor 110 and the impeller 130. In the submersible pump consisting of
The housing 140 is configured such that the motor chamber 141 including the motor 110 and the pumping chamber 142 in which the impeller 130 is installed are partitioned by the partition wall 143 to form an independent space.
The rotary shaft 120 is installed in the motor chamber 141 to the first rotary shaft 121 connected to the motor 110 and the second rotary shaft 122 installed in the pumping chamber 142 and connected to the impeller 130. Is composed,
The magnetic block 150 is installed on the first rotation shaft 121, the flywheel is bound by the magnetic block 150 and the magnetic force to receive power and to maintain the rotational inertia of the rotation shaft 120 to prevent water hammer phenomenon 160 is installed on the second rotary shaft 122,
The magnet block 150 is composed of an electromagnet is a sealed submersible pump having a water hammer prevention structure, characterized in that the magnet block 150 and the flywheel 160 is selectively coupled by the magnetization of the electromagnet. delete The method of claim 1,
The flywheel 160 is a sealed submersible pump having a water hammer prevention structure, characterized in that the laminated silicon steel sheet is configured so that less residual magnetic. The method of claim 1,
The magnet block is a hermetically sealed submersible pump having a water hammer prevention structure, characterized in that configured to be magnetized by receiving power when the power is applied to the motor (110).

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