KR100482746B1 - Sealed magnetic pump having integrated magnetic coupling with an impeller - Google Patents

Abstract

The present invention relates to a non-leak magnet pump using a permanent magnet, and in order to enable perfect sealing of the pump head without using an expensive mechanical seal, the pump head case and a fixed rotating shaft extending toward the inside of the pump head case are provided. A pump head including a pressure plate provided; It is composed of a donut-shaped first yoke, a plurality of first permanent magnets installed in the first yoke, and a first magnetic housing having an accommodating groove therein and having a through hole at the center thereof, and which can be rotated on a fixed rotating shaft. Driven magnetic couplings; A connecting shaft comprising a base plate and a cylindrical portion extending from the center of the base plate, the base plate side being coupled to the center of the first magnetic housing; An impeller having a plurality of blades and fixed to a cylindrical portion; Like the driven magnet coupling and the second yoke, the second permanent magnet, and the second magnetic housing, and the main magnetic coupling disposed so as to oppose the driven magnetic coupling and the pressure plate in the state installed on the output shaft of the motor It is composed of a ring; including, without the use of expensive mechanical seals can be completely sealed to reduce the maintenance cost, and a leak-free magnet that has an excellent effect for preventing leakage when pumping fluids containing harmful and environmental pollutants Provide a pump.

Description

Leak-free magnetic pump with integrated magnetic coupling and impeller {SEALED MAGNETIC PUMP HAVING INTEGRATED MAGNETIC COUPLING WITH AN IMPELLER}

The present invention relates to a leak-free magnet pump using a permanent magnet, and more particularly, to completely seal the pump head through which the fluid flows and to transfer power to the coupling using the permanent magnet to prevent the fluid from leaking to the outside. The present invention relates to a non-leak magnet pump which is more suitable for a high pressure pump structure in which a mechanical seal used for sealing in a general pump is difficult to use.

In general, a pump is a device that transfers a fluid by using a pressure difference. The pump receives power from a motor, which is an electrical power supply means, or a prime mover, which is a mechanical power supply means. It is a device that forms a pressure difference by rotating an impeller or a screw installed in an inner space to suck a fluid from an inlet and discharge a high pressure fluid into a discharge tube. The output shaft of the motor or prime mover is directly or indirectly inserted into the pump head, and an impeller or a screw is installed in the output shaft to be inserted in this way and configured to rotate together when the power supply means rotates. Due to the output shaft inserted from the outside, there is a weakness of sealing and to overcome this weakness, a mechanical seal is installed between the outer periphery of the output shaft and the inner periphery of the through-hole through which the output shaft penetrates to seal the internal space. .

However, the mechanical seal has a problem that it is difficult to use the high pressure pump due to the limited life of the pump because it is easy to lose the function of the pump and is often repaired.

That is, since it is impossible to seal completely, it is not suitable for pumping fluids containing hazardous substances and environmental pollutants such as toxic, flammable and radioactive substances operated at high pressure.

Invented to solve the problems of the prior art as described above,

The object of the present invention is to provide a complete seal of the pump head without the need for expensive mechanical seals that need to be replaced periodically, suitable for pumps that require high pressure, and toxic, flammable and radioactive materials that pose a major threat to safety in case of leakage. Not only is it suitable for pumping fluids containing harmful substances and environmental pollutants such as, but also to provide a leak-free magnetic pump to maximize the durability of the pump by reducing frictional wear and frictional heat without a separate lubricant supply.

The present invention for realizing this

In a magnetic pump that transmits power using a permanent magnet in a sealed state of the pump head in which the impeller is embedded,

A pump head including a pump head case having a suction port and a discharge port, and a pressure plate for sealing a pump head case, the pump head having a fixed rotating shaft extending from the center toward the pump head case;

It has a donut-shaped first yoke, a plurality of first permanent magnets installed in the first yoke, and a receiving groove into which the first yoke in which the plurality of first permanent magnets are installed is built, and a through hole is provided in the center thereof. A driven magnetic coupling including a first magnetic housing provided and rotatably installed on the fixed rotation shaft;

A connecting shaft formed of a cylindrical base plate and a cylindrical portion extending from the center of the base plate, the base plate side being coupled to the center of the first magnetic housing;

The impeller having a plurality of blades and fixed to the cylindrical portion through its center hole; And

A donor-shaped second yoke, a plurality of second permanent magnets installed in the second yoke, and a receiving groove into which the second yoke in which the plurality of second permanent magnets are installed are built, have a through hole in the center thereof. And a second magnetic housing having a main magnetic coupling disposed adjacent to an outer surface of the pressure plate so as to be interlocked with the driven magnetic coupling in a state in which the motor is installed on the output shaft of the motor. Provide a magnetic pump.

Here, the driven magnetic coupling is fixed to the fixed rotating shaft through at least one bearing installed in the through hole of the first magnetic housing, the first magnetic housing is provided with a plurality of subblades formed on the side facing the pressure plate The connecting shaft includes a through hole penetrating through the center thereof, and has an inner flow path of the fluid connected to the suction hole, the through hole of the connecting shaft, the bearing, the subblade, and the discharge hole.

The fixed rotation shaft may include a plurality of grooves formed on an outer circumferential surface thereof, and may include an inner flow path of the fluid connected in the order of the inlet port, the through hole of the connecting shaft, the bearing and the groove, the subblade, and the outlet port. .

In addition, the groove is characterized in that it is formed parallel to the axial direction or helical.

On the other hand, the first ceramic circular plate is provided at the end of the fixed rotary shaft, the second ceramic circular plate in contact with the first ceramic circular plate is characterized in that the base plate of the connecting shaft is installed.

In addition, the first magnetic housing has a plurality of subblades formed on the side facing the pressure plate, the connecting shaft and the first and second ceramic circular plate has a through hole through each center, the fixed The rotating shaft has a through hole extending through the center to its root portion and at least one radial hole penetrating in the radial direction from the center of the root portion to be connected to the through hole. It is characterized in that it can be provided with an internal flow path of the fluid connected in the order of the through hole of the ceramic circular plate, the through hole of the fixed rotary shaft and the radial through, sub-blade, discharge port.

In addition, the subblade is characterized in that the curved in the same direction as the blade of the impeller.

BEST MODE Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The leak-free magnet pump according to the preferred embodiment of the present invention includes a pump head 10, an impeller 30 and a driven magnet coupling 50, an electric motor 90, and a built-in pump head 10. , The main magnet coupling 70 is installed in the electric motor and disposed at a position opposite to the driven magnet coupling 50.

As shown in FIG. 1, the pump head 10 in which the impeller 30 for pumping fluid is built is composed of a pump head case 5 and a pressure plate 15 which completely seals the pump head case 5. The pump head case 5 has a space in which the impeller 30 and the driven magnet coupling 50 integrally coupled with the impeller are formed, and an inlet 2 and an outlet 3 through which the fluid enters and are respectively formed. have. In addition, the pressure plate 15 has a fixed rotating shaft 20 extending from the center thereof toward the pump head case 5.

The pump head case 5 also has a drain hole 6 formed for completely discharging the fluid therein, which is normally sealed by a sealing bolt bushing 7. Then, the bolt 13 is fastened and sealed while the seal 11 is inserted between the pressure plate 15 and the pump head case 5.

The driven magnet coupling 50 is a donut-shaped yoke 35 made of carbon steel, a plurality of permanent magnets 40 installed in the yoke, and a yoke 35 provided with a plurality of permanent magnets 40. It comprises a housing (53) having a housing groove (51) to be built therein and a magnet housing (55) consisting of a housing cover (57) for closing it. The magnet housing 55 is also formed in a donut shape having a through hole 59 penetrating the central portion thereof.

The plurality of permanent magnets 40 may be arranged in various ways on one side of the yoke 35, that is, the surface facing the pressure plate 15, and there may be water droplets depending on the arrangement method. Each size can be adjusted according to the number of 40). As shown in Figure 2, the permanent magnet 40 is preferably formed in a disc shape, the distance (X) between adjacent permanent magnets in the arrangement is from 0 to the radius of the permanent magnet (D / 2; D = diameter Maintain a constant distance in the range of the distance corresponding to the), the manpower acting between the distance between the driven magnet coupling 50 and the main magnetic coupling 70 to be described later and the permanent magnets on both sides and the device to be applied It is determined by considering the torque.

The driven magnet coupling 50 and the impeller 30 are coupled to each other such that the plane of the housing case 53 side corresponding to each other and the back surface of the impeller 30 on which the blades 25 are not formed face each other. It is coupled through a connecting shaft 60 to.

The connecting shaft 60 is composed of a cylindrical base plate 61 and a cylindrical portion 63 protruding from the center of the base plate and having a screw formed on an outer circumferential surface thereof, and the base plate 61 side is located at the center of the housing case 53. Joined by bolting or welding. Then, by inserting the impeller 30 so that the cylindrical portion 63 penetrates the center hole of the impeller 30 and then tightens it with the nut 31 to fix the impeller 30 to the connecting shaft 60, thereby impeller 30. And the driven magnet coupling 50 are integrally formed.

As described above, as the planar structure of the magnetic housing 55 and the impeller 30 of the driven magnetic coupling 50 facing each other when coupled to each other, the impeller located inside the pump head 10 Through the integration between the 30 and the driven magnetic coupling 50 it is possible to minimize the length of the fixed rotary shaft.

In this way, the impeller 30 and the driven magnet coupling 50 which are integrally coupled to each other are applied to the magnetic force during the rotation of the main magnetic coupling 70 to be described later in the state installed in the fixed rotation shaft 20 provided in the pressure plate 15. By interlocking and rotating together. That is, it is installed to be rotatable by a pair of bearings 21 and 22 fitted to be positioned between the inner circumferential surface of the housing case 53 constituting the driven magnet coupling 50 and the outer circumferential surface of the fixed rotation shaft 20. . A bushing 23 is provided between the bearing 21 and the bearing 22 to maintain the spacing, and the axial load caused by the attraction of the permanent magnet always acts on the pressure plate 15 in the driven magnet coupling 50. It is not necessary to couple fastening elements such as fixing pins separately between the bearings 21 and 22 and the driven magnet coupling 50 and between the bearings 21 and 22 and the fixed rotating shaft 20.

While the pressure plate 15 is assembled to the pump head case 5 in the assembled state as described above, the impeller 30 and the driven magnet coupling 50 are positioned in the pump head case 5, that is, the fluid. It is located in the operating position for pumping.

The driven magnet coupling 50 is rotated together as the main magnetic coupling 70 is located close to the outer surface of the pressure plate 15 by the rotation of the electric motor 90, and thus the impeller 30 Rotation allows the fluid to be pumped.

On the other hand, as shown in detail in Figure 3, the connecting shaft 60 is provided with a through-hole 64 through the center, the through-hole 64 is the pumping occurs when the driven magnetic coupling 50 rotates By effect, the fluid is provided as an internal flow path allowing the fluid to reach the inner surface of the pressure plate 15 via the center of the driven magnet coupling 50 on the impeller 30 side. In addition, in order to facilitate the circulation of the fluid through the through-hole 63, grooves 19 are formed on the outer circumferential surface of the fixed rotation shaft 20 in the axial direction or the spiral direction.

4, a plurality of subblades 65 are provided on the outer surface of the housing cover 57 of the driven magnetic coupling 50 facing the inner surface of the pressure plate 15 to generate the pumping effect. Is formed. The subblade 65 is formed similar to the blade 25 formed in the impeller 30, and the direction of the subblade 65 is the same as the direction of the blade 65 formed in the impeller 30.

In other words, as the driven magnet coupling 50 rotates, not only the blade 25 provided in the impeller 30 but the subblade 65 provided in the housing cover 57 also generate a pumping effect. The fluid flows into the through hole 59 side of the magnet housing 55 through the through hole 64, and then the groove 19 formed in the fixed rotation shaft 20 or through the gap between the bearings 21 and 22 itself. It flows in between the housing cover 57 where the subblade 65 is located and the inner surface of the pressure plate 15, and finally toward the discharge port 3 by the driving force generated by the subblade 65 of the housing cover 57. The fluid flowing out acts as a lubricant to alleviate friction of the perturbation part, thereby increasing the life of the bearing and further improving the durability of the pump.

That is, by circulating the fluid inside so that the lubricating effect acts on the bearings 21 and 22 located between the fixed rotation shaft 20 and the magnet housing 55, the frictional heat generated in the bearings is reduced, and the wear is reduced. It will be able to greatly increase.

Like the driven magnet coupling 50, the main magnetic coupling 70, the doughnut-shaped yoke 75, a plurality of permanent magnets 80, and a plurality of permanent magnets 80 provided in the yoke ) Is made of a configuration including a housing (83) having the same housing groove (81) to accommodate the installed yoke (75) and a housing (87) made of a housing cover (87) for closing it. Similarly, the magnet housing 85 is also formed in a donut shape having a through hole 89 penetrating the central portion. In addition, the method of arranging a plurality of permanent magnets 80 is the same as the driven magnet coupling 50 so that the permanent magnets on both sides to face one-to-one correspond. Of course, since the attraction force to each other between the main magnet coupling 70 and the driven magnet coupling 50 should act, it is natural that the permanent magnets 40 and 80 used in each should have a different polarity Will do.

In addition, the main magnetic coupling 70 is installed on the output shaft 95 of the electric motor 90 to be rotated by the rotation of the electric motor 90, the magnet housing constituting the main magnetic coupling 70 ( The bushing 97 is inserted into the inner circumferential surface of the 85 to be fixed to the output shaft 95 of the electric motor 90, and a fixing pin 98 for fixing the bushing 97 and the magnet housing 85 to each other and the output shaft 95. ) And the fixing pins 99 for fixing the bushing 97 to each other to prevent relative rotation at each boundary, and the main magnetic coupling 70 is pulled out of the output shaft 95 by the magnetic force toward the pressure plate 15. Secure to prevent escaping.

The electric motor 90 should be selected in consideration of the rotational force determined by the frictional force acting on the impeller 30 and the driven magnet coupling 50 in the pump head 10 and the discharge pressure of the required fluid. In other words, it should be selected to have a motor output more than the maximum pump output that can be realized by the manpower acting between the permanent magnets.

As described above, the pump head 10 in the state in which the impeller 30 and the driven magnetic coupling 50 are installed is fixed to the pump support 100 by using the support block 105, and the main shaft to the output shaft 95 The electric motor 90 in which the magnet coupling 70 is installed is also fixed to the pump support 100 using the support block 110 so that the main magnet coupling 70 is coaxial with the driven magnet coupling 50. do.

Hereinafter, a non-leak magnet pump according to another embodiment of the present invention will be described. Although most of the configuration is the same as the above embodiment, a pair that is resistant to abrasion in a frictional state without using the bearings 21 and 22 to reduce friction between the fixed rotating shaft 20 and the driven magnetic coupling 50. Ceramic circular plate 111 and 113 are provided. In more detail, the fixed rotation shaft 20 is formed to correspond to the diameter of the through hole 59 formed in the center of the magnet housing 55 constituting the driven magnet coupling 50, coupled in a loose fit state do. And the ceramic circular plate 111 excellent in abrasion resistance is provided in the end surface of the fixed rotating shaft 20. As shown in FIG. In the state in which the impeller 30 and the driven magnetic coupling 50 integrated through the connecting shaft 60 are installed on the fixed rotation shaft 20, the impeller 30 and the driven magnet coupling 50 are adjacent to the ceramic circle plate 111 provided with the fixed rotation shaft 20. The base plate 61 of the connecting shaft 60 is also provided with a ceramic circular plate 113, so that contact occurs between the ceramic circular plates 111 and 113, thereby minimizing wear and enabling smooth rotation. That is, the ceramic circular plates 111 and 113 made of a material having excellent wear resistance support the two portions in which the axial load due to the attraction between the permanent magnets always acts and the mutual friction state is maintained.

In addition, through the center of the fixed rotary shaft 20 and each of the ceramic circular plate 111, 113, the through hole 115, 117, 119 which is in line with the through hole 64 formed in the connecting shaft 60, respectively In particular, the fixed rotation shaft 20 has a sub-blade 65 formed in the housing cover 57 having one or more radial through-holes 120 penetrating in the radial direction from the center of the base portion thereof and connected to the through-holes 115. The internal circulation of the fluid according to the pumping action by) should be smooth. That is, when the pumping effect of the subblade 65 provided in the housing cover 57 by rotation occurs, the fluid flows through the through hole 64 of the connecting shaft 60, the connecting shaft 60 and the fixed rotating shaft ( 20 through the through holes 119, 117 formed in each of the ceramic circular plate 113 (111) to be in contact with each other, in order, respectively, through the through hole 115 and the radial through hole 120 of the fixed rotary shaft 20 Inflow between the housing cover 57 and the inner surface of the pressure plate 15 through the), and finally exits to the discharge port 3 side by the driving force generated by the sub-blade 65 of the housing cover 57.

The fluid flowing in this way penetrates into the perturbation portion between the ceramic circular plates 111 and 113 where friction occurs, serves as a lubricant to reduce friction, and reduces frictional heat to maximize the life of the ceramic circular plates 111 and 113. In addition, it is also supplied to the gap between the inner circumferential surface of the driven magnet coupling 50 and the outer circumferential surface of the fixed rotation shaft 20 to serve as a lubricant, to have a smooth rotation and improve the durability of the pump.

Hereinafter, a method of operating the non-leak magnet pump according to the present invention as described above will be described.

First, the driving magnet coupling 70 is rotated by applying electricity to the electric motor 90, the driving magnet coupling 70 and the driven magnet coupling 50 is in a state in which the attraction force to each other Accordingly, the driven magnet coupling 50 rotates, and at the same time, the fluid flowing from the inlet 2 of the pump head 10 is discharged as the impeller 30 integrally coupled with the driven magnet coupling 50 rotates. You will exit to (3). The rotation of the electric motor 90 is preferably gradually increased without excessively increasing from the beginning to prevent a decrease in pumping efficiency caused by slip between the main magnet coupling 70 and the driven magnet coupling 50. Thus, a speed controller (inverter) (not shown) is additionally provided for controlling the speed of the motor. The speed controller linearly increases the power frequency from OHz to 60 Hz for a predetermined time, so that the driven magnet coupling 50 on the side of the impeller 30 arranged in pairs with the main magnetic coupling 70 by magnetic force (suction force) is unreasonable. Make it work. Of course, without increasing the power supply frequency linearly, such as when the initial load of the driven magnet coupling 50 is large may be increased to a specific curved form of the 'S' shape. That is, the initial increase of the frequency is gradually increased so that the rotational power is smoothly transmitted to the driven magnet coupling 50.

Of course, as described above, a part of the fluid passing through the pump head 10 is in the same level as the bearings 21 and 22 and the ceramic circular plates 111 and 113 of the first and second embodiments. Lubrication and frictional heat are alleviated to reduce friction in the eastern part, enabling smoother rotation and more efficient pumping.

The leak-free magnetic pump according to the present invention as described above does not use expensive mechanical seals that need to be replaced periodically, thereby reducing maintenance costs, and using a mechanical seal as a complete sealing is possible by using a permanent magnet as a power transmission structure. It is suitable for this difficult high pressure pump, and it is not only general pipe pressure system (10kg / cm2 or less) but also harmful and environmental pollutants such as toxic, flammable and radioactive substances under high pressure in high pressure pipe pressure system (250kg / cm2 or less). It has an excellent effect for preventing the leakage of the fluid including the pump.

In addition, in integrally coupling the impeller and the driven magnet coupling, miniaturization and simplification by minimizing the length of the shaft added by the connecting shaft, the mechanical and structural defects are reduced, it is easy to manufacture.

In addition, as a structure capable of supplying a part of the fluid to be pumped to the frictional part, the wear caused by the friction is reduced and the frictional heat is reduced to increase the life of the friction-releasing member such as the bearing or the ceramic circular plate to increase the life of the pump. It has the advantage of maximizing durability.

While the invention has been shown and described in connection with specific embodiments, it is conventional in the art that various changes, modifications and variations are possible without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone with knowledge of this will easily know.

1 is a cross-sectional view showing a leak-free magnet pump according to a first embodiment of the present invention.

Figure 2 is a front view and a sectional view showing a state in which the permanent magnet is arranged in the doughnut-shaped yoke.

Figure 3 is an enlarged cross-sectional view of the pump head portion of Figure 1 showing the internal flow path.

4 is a front view and a cross-sectional view showing a subblade provided in the magnet housing.

5 is a cross-sectional view showing a leak-free magnet pump according to a second embodiment of the present invention.

6 is an enlarged cross-sectional view of the pump head portion of FIG. 1 showing an internal flow path;

* Description of the symbols for the main parts of the drawings *

2: inlet port 3: outlet port

5: pump head case 6: drain hole

7: bolt bushing 10: pump head

15: pressure plate 19: groove

20: fixed shaft 21, 22: bearing

25: blade 30: impeller

35, 75: yoke 40, 80: permanent magnet

50: driven magnet coupling 51, 81: receiving groove

53, 83: housing case 55, 85: magnet housing

57, 87: housing cover 59, 89: through hole

60: connecting shaft 61: base plate

63: cylindrical part 64, 115, 117, 119: through hole

70: main magnet coupling 90: electric motor

100: pump support 111, 113: ceramic circular plate

120: radial through

Claims (7)

      In a pump having a pump head in which the fluid introduced through the suction port is discharged through the discharge port as the built-in impeller rotates,       A main magnet having a plurality of permanent magnets and a second housing accommodating the permanent magnets, the main magnet being connected to an output shaft of the drive motor such that the second housing can rotate in correspondence with a rotation of a predetermined drive motor; And       A fixed rotating shaft connected to a predetermined frame, a plurality of permanent magnets, and a first housing configured to receive the permanent magnets and to rotate around the fixed rotating shaft, and a connecting shaft connecting the first housing and the impeller. The pump head; It is made, including, the main magnet and the pump head so that the magnets of the pump head to rotate in the same form as the rotational shape of the main magnet portion as the permanent magnets of the main magnetic part rotates in response to the rotation of the drive motor Are spaced apart from each other, at least two magnets are stacked along the axial direction of the output shaft of the driving motor, and at least two magnets of the pump head are at least two magnets of the fixed rotation shaft. Leak-free magnet pump, characterized in that laminated along the direction. According to claim 1, wherein the frame is a pressure plate, the pump head is sealed by the combination of the pump head case is provided with the suction port and the discharge port and the pressure plate having the fixed rotation shaft in the inner center portion, the main magnet portion A non-leak magnet pump, characterized in that spaced apart a predetermined distance on the outside of the pressure plate. According to claim 2, A through hole is formed through the center of the connecting shaft of the pump head in the axial direction, the through hole is formed in the center portion of the first housing to be connected to the through hole, and the first magnetic housing and Leakage magnet pump characterized in that the passage is formed between the pressure plate to be connected to the through hole, the fluid flowing through the suction port is sequentially moved along the through hole, through hole, and the passage. 4. The leak-free magnet pump according to claim 3, wherein a plurality of grooves are formed on an outer circumferential surface of the fixed rotation shaft. The leak-free magnet pump according to claim 4, wherein the groove is formed parallel to the axial direction or spirally. The leak-free magnet pump according to claim 1, wherein the first housing has a donut shape surrounding the fixed rotation shaft. The liquid-free magnetic pump of claim 2, wherein a plurality of subblades are formed on a side surface of the first housing facing the pressure plate.