CN111969772B

CN111969772B - Permanent magnet variable frequency motor for pump

Info

Publication number: CN111969772B
Application number: CN202010872774.9A
Authority: CN
Inventors: 杨学良; 胡正会
Original assignee: Zhejiang Xiling Co ltd
Current assignee: Zhejiang Xiling Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-07-27
Anticipated expiration: 2040-08-26
Also published as: CN111969772A

Abstract

The invention relates to the technical field of variable frequency motors, in particular to a permanent magnet variable frequency motor for a pump, which comprises a motor body and a damping device, wherein a mounting foot is fixedly arranged at the lower end of the motor body and is detachably connected with the upper end of the damping device through a bolt; the damping device comprises a top plate, a damping block and a bottom plate which are sequentially arranged from top to bottom, and the mounting feet are detachably connected with the top plate through bolts; a plurality of groups of first springs are arranged between the top plate and the damping block, the first springs are arranged along the edge of the upper end of the damping block, and the lower end of the top plate is fixedly provided with a guide post which is vertically arranged; the setting through first spring, first piston, second piston can offset the impact force that the motor body during operation produced, consumes the impact energy, reduces motor body's shock strength, and the while noise reduction, the shock attenuation effect is very good, has improved motor body during operation's stability.

Description

Permanent magnet variable frequency motor for pump

Technical Field

The invention relates to the technical field of variable frequency motors, in particular to a permanent magnet variable frequency motor for a pump.

Background

The water pump is a machine for conveying liquid or pressurizing liquid, which transfers the mechanical energy of a prime motor or other external energy to the liquid to increase the energy of the liquid, is mainly used for conveying the liquid, such as water, oil, acid-base liquid, emulsion, suspoemulsion, liquid metal and the like, and can also convey liquid, gas mixture and liquid containing suspended solids; the water pump can be classified into a displacement pump, a vane pump and the like according to different working principles, the displacement pump transfers energy by using the change of the volume of a working chamber, the vane pump transfers energy by using the interaction of a rotary vane and water, and the pump is of a centrifugal pump, an axial flow pump, a mixed flow pump and the like.

The existing water pump is generally driven by the permanent magnet variable frequency motor, but the permanent magnet variable frequency motor can generate strong vibration when rotating, the strong vibration can cause the mechanical strength and rigidity of the parts inside the permanent magnet variable frequency motor to be poor, the service life of the permanent magnet variable frequency motor is seriously reduced, the phenomenon that the operation mounting platform shakes unstably can be caused, and meanwhile, a large amount of noise influences workers.

The permanent magnet variable frequency motor for the pump is designed, the impact force generated when the motor body works can be offset through the arrangement of the first spring, the first piston and the second piston, the impact capacity is consumed, the vibration strength of the motor body is reduced, meanwhile, the noise is reduced, the shock absorption effect is very good, and the stability of the motor body during working is improved.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that the installation platform is unstable in shaking and the service life of the installation platform is influenced due to strong vibration generated by the permanent magnet variable frequency motor during working, the invention provides the permanent magnet variable frequency motor for the pump.

The technical scheme adopted by the invention for solving the technical problems is as follows: a permanent magnet variable frequency motor for a pump comprises a motor body and a damping device, wherein a mounting foot is fixedly arranged at the lower end of the motor body, and the mounting foot is detachably connected with the upper end of the damping device through a bolt; the damping device comprises a top plate, a damping block and a bottom plate which are sequentially arranged from top to bottom, and the mounting feet are detachably connected with the top plate through bolts; be provided with the first spring of multiunit between roof and the snubber block, first spring is arranged along snubber block upper end edge, the roof lower extreme is fixed to be provided with the guide post of vertical arrangement, the guide post sets up in the first spring that corresponds, the snubber block upper end correspondence is provided with the guide way that matches with the guide post.

When the motor is used, the mounting foot of the motor body is fixedly connected with the top plate through the bolt, and due to the arrangement of the first spring, when the motor body works, the vertical pressure generated by the motor body can compress the first spring through the top plate, so that the impact force on the top plate is dredged, the phenomenon that the top plate shakes violently or generates huge noise due to the impact force generated on the top plate is avoided, the damping effect is very good, and the working stability of the motor body is improved; the guide post is inserted into the guide groove, so that the transverse impact force generated during the working of the motor body can be offset, the motor body is forced to vibrate only in the vertical direction, the probability of overturning caused by large vibration amplitude of the single side of the motor body is reduced, and the service life is prolonged.

Preferably, a first cavity is arranged in the damping block, a first rod is arranged in the first cavity, a first piston is fixedly connected to the outer wall of the first rod, the first piston is in sealing fit with the side wall of the first cavity and can move up and down along with the action of the first rod, and the upper end of the first rod penetrates through the damping block to extend to the lower end of the top plate and is fixedly connected with the lower end of the top; the first piston is provided with a plurality of damping holes penetrating through the first piston, and damping oil is filled in the first cavity. Can drive the impact force transmission that the roof vibrations produced for first piston through first pole, and then make first piston reciprocate at first intracavity, because the lateral wall seal fit in first piston and first chamber, consequently the damping oil of downside can only circulate through the damping hole on the first piston, and no matter first piston shifts up or moves down, the damping force direction that the damping oil produced is opposite with motor body's motion trend all the time, consequently, motor body's shock attenuation intensity has been reduced, the shock attenuation effect is very good, the stability of motor body during operation has been improved.

Preferably, a plurality of second cavities which are horizontally arranged are arranged on the side wall of the first cavity, second pistons are correspondingly arranged in the second cavities, and second rods are fixedly arranged on one sides of the second pistons, which face the first cavities; the lower part of the first piston is in a truncated cone shape with a large upper part and a small lower part, and the second rod extends into the first cavity and is abutted against the side wall of the lower part of the first piston; and a second spring which is abutted against the second piston is arranged on one side of the rodless cavity of the second cavity, and a first air hole communicated with the outside is arranged on one side of the rodless cavity, which is far away from the second piston. Through the setting of the second rod, when the first rod is pressed to move downwards to drive the first piston to move downwards, because the lower part of the first piston is in a truncated cone shape with a large upper part and a small lower part, the first piston can gradually extrude the second rod into the second cavity, and then the second piston overcomes the elasticity of the second spring to move towards one side of the first air hole, so that the vertical impact force received by the first piston is converted into a plurality of horizontal component forces, the second spring is used for damping and energy consumption, the secondary damping effect is achieved, the damping effect is improved, the second piston is used for compressing the air in the second cavity and discharging the air, the high-speed air flow is directly blown to the motor body, and the heat dissipation performance of the motor body is improved.

Preferably, the radius of the first air hole is gradually reduced from inside to outside, the first air hole is arranged obliquely upwards, and the spraying direction of the first air hole faces the motor body. Because the radius of the first air hole is gradually reduced from inside to outside, the speed of the sprayed air flow is higher when the first air hole exhausts, and the heat dissipation effect of the motor body is improved; on the contrary, when first gas port breathes in, because the radius in the outside is less, lead to first gas port to breathe in slower, and then make the second piston reset slower, and make the pressure in first intracavity be the negative pressure, delay the removal of first piston, just so make first piston when receiving violent decurrent impact force, can reset slowly after accomplishing the shock attenuation buffering, avoid the resilience collision damage that the quick reset arouses, consequently the life of extension.

Preferably, a buffer cavity is arranged in the bottom plate, a buffer head is arranged in the buffer cavity, the lower end of the first rod penetrates through the damping block and extends into the buffer cavity to be fixedly connected with the buffer head, and elastic pieces are symmetrically arranged in the buffer cavities on two sides of the buffer head; the upper end of the elastic sheet is fixed on the upper wall of the buffer cavity, the lower end of the elastic sheet is bent towards the buffer head, and the side wall of the buffer head is provided with a friction pair which is in sliding friction with the elastic sheet; an air bag is arranged between the elastic sheet and the side wall of the buffer cavity. Make first pole receive the frictional force between vice and the shell fragment of friction, the elasticity that shell fragment self warp and the reaction force that the pressurized of gasbag produced when moving down in the cushion chamber through the buffer head, consequently produce multiple energy-absorbing mode in the same time, effectively reduce motor body's vibrations energy, very big improvement the shock attenuation effect.

Preferably, the buffering head is provided with a second air hole which is arranged up and down, the second air hole sequentially penetrates through the first rod, the top plate and the mounting foot, and the spraying direction of the second air hole faces the motor body. Through the setting of second gas pocket, on the one hand, can move down the gas of compression buffering intracavity and make this part gas discharge through the second gas pocket through the buffer head, the peripheral air flow of motor body accelerates, the heat dispersion of motor body is improved, on the other hand, vibrations second gas pocket all has the air flow at every turn, and then can take away the heat of first intracavity damping oil through the mode of first pole heat transfer, avoid damping oil to lead to its viscidity resistance to reduce's the condition because of using the intensification for a long time, consequently, make first intracavity have better shock attenuation effect all the time, the stability of motor body during operation has been improved.

The invention has the following beneficial effects:

1. according to the permanent magnet variable frequency motor for the pump, the impact force generated when the motor body works can be offset through the arrangement of the first spring, the first piston and the second piston, the impact capacity is consumed, the vibration strength of the motor body is reduced, meanwhile, the noise is reduced, the damping effect is very good, and the stability of the motor body during working is improved.

2. According to the permanent magnet variable frequency motor for the pump, the first air hole and the second air hole are arranged, so that the shock absorption performance of the motor body can be improved in an auxiliary mode, air exhausted during vibration can be blown to the motor body, and the heat dissipation performance of the motor body is improved.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view of the shock absorbing device of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a partial enlarged view at B in FIG. 3;

in the figure:

1. a motor body; 2. mounting a foot; 3. a bolt; 4. a top plate; 5. a damper block; 6. a guide post; 7. a first spring; 8. a first air hole; 9. a base plate; 10. a first lever; 11. a second air hole; 12. a first chamber; 13. a first piston; 14. a damping hole; 15. a second chamber; 16. a second lever; 17. a second piston; 18. a second spring; 19. a buffer chamber; 20. a buffer head; 21. a friction pair; 22. a spring plate; 23. an air bag.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, a permanent magnet variable frequency motor for a pump comprises a motor body 1 and a damping device, wherein a mounting leg 2 is fixedly arranged at the lower end of the motor body 1, and the mounting leg 2 is detachably connected with the upper end of the damping device through a bolt 3; the damping device comprises a top plate 4, a damping block 5 and a bottom plate 9 which are sequentially arranged from top to bottom, and the mounting feet 2 are detachably connected with the top plate 4 through bolts 3; be provided with the first spring 7 of multiunit between roof 4 and the snubber block 5, first spring 7 arranges along snubber block 5 upper end edge, the fixed guide post 6 that is provided with vertical arrangement of roof 4 lower extreme, guide post 6 sets up in the first spring 7 that corresponds, snubber block 5 upper end correspondence is provided with the guide way that matches with guide post 6.

When the motor is used, the mounting feet 2 of the motor body 1 are fixedly connected with the top plate 4 through the bolts 3, and due to the arrangement of the first springs 7, when the motor body 1 works, vertical pressure generated by the motor body can compress the first springs 7 through the top plate 4, so that impact force on the top plate 4 is dredged, severe vibration or huge noise of the top plate 4 caused by impact force generated on the top plate 4 is avoided, the damping effect is very good, and the working stability of the motor body 1 is improved; through inserting guide post 6 to the guide way in, can offset the horizontal impact force that motor body 1 during operation produced, force motor body 1 vibrations only in vertical direction, reduced because of the great probability that leads to toppling of motor body 1 unilateral vibration range, increase of service life.

As an embodiment of the present invention, a first cavity 12 is disposed in the damper block 5, a first rod 10 is disposed in the first cavity 12, a first piston 13 is fixedly connected to an outer wall of the first rod 10, the first piston 13 is in sealing fit with a side wall of the first cavity 12 and can move up and down along with the movement of the first rod 10, and an upper end of the first rod 10 penetrates through the damper block 5 and extends to a lower end of the top plate 4 and is fixedly connected to a lower end of the top plate; the first piston 13 is provided with a plurality of damping holes 14 penetrating through the first piston, and the first cavity 12 is filled with damping oil. Can drive the impact force that roof 4 vibrations produced with motor body 1 through first pole 10 and transmit first piston 13, and then make first piston 13 reciprocate in first chamber 12, because the sealed cooperation of the lateral wall of first piston 13 and first chamber 12, consequently the damping oil of the downside can only circulate through damping hole 14 on first piston 13, and no matter first piston 13 shifts up or moves down, the damping force direction that damping oil produced is opposite with motor body 1's motion trend all the time, consequently, motor body 1's shock attenuation intensity has been reduced, the shock attenuation effect is very good, the stability of motor body 1 during operation has been improved.

As an embodiment of the present invention, a plurality of second chambers 15 horizontally arranged are disposed on a side wall of the first chamber 12, a second piston 17 is correspondingly disposed in the second chambers 15, and a second rod 16 is fixedly disposed on one side of the second piston 17 facing the first chamber 12; the lower part of the first piston 13 is in a shape of a truncated cone with a large upper part and a small lower part, and the second rod 16 extends into the first cavity 12 and is abutted against the side wall of the lower part of the first piston 13; a second spring 18 which is abutted against the second piston 17 is arranged on one side of a rodless cavity of the second cavity 15, and a first air hole 8 communicated with the outside is arranged on one side of the rodless cavity, which is far away from the second piston 17. Through the arrangement of the second rod 16, when the first rod 10 is pressed to move downwards to drive the first piston 13 to move downwards, because the lower part of the first piston 13 is in a truncated cone shape with a large upper part and a small lower part, the first piston 13 can gradually extrude the second rod 16 into the second cavity 15, and further the second piston 17 moves towards one side of the first air hole 8 by overcoming the elasticity of the second spring 18, so that not only is the vertical impact force on the first piston 13 converted into a plurality of horizontal component forces and the second spring 18 is used for damping and dissipating energy, but also the secondary damping effect is achieved, the secondary damping effect is improved, the second piston 17 is also realized to compress and discharge the air in the second cavity 15, and the high-speed air flow is directly blown to the motor body 1, so that the heat dissipation performance is improved.

In one embodiment of the present invention, the radius of the first air hole 8 is gradually reduced from inside to outside, and the first air hole 8 is arranged obliquely upward and the injection direction thereof is toward the motor body 1. Because the radius of the first air hole 8 is gradually reduced from inside to outside, when the first air hole 8 exhausts air, the speed of the ejected air flow is high, and the heat dissipation effect of the motor body 1 is improved; on the contrary, when first gas pocket 8 breathes in, because the radius in the outside is less, lead to first gas pocket 8 to breathe in slowly, and then make second piston 17 reset slowly, and make the pressure in first chamber 12 be the negative pressure, delay the removal of first piston 13, just so make first piston 13 when receiving violent decurrent impact force, can slowly reset after accomplishing the shock attenuation buffering, avoid the resilience collision harm that the quick reset arouses, consequently the life of extension.

As an embodiment of the present invention, a buffer cavity 19 is arranged in the bottom plate 9, a buffer head 20 is arranged in the buffer cavity 19, the lower end of the first rod 10 passes through the damping block 5 and extends into the buffer cavity 19 to be fixedly connected with the buffer head 20, and elastic pieces 22 are symmetrically arranged in the buffer cavities 19 at two sides of the buffer head 20; the upper end of the elastic sheet 22 is fixed on the upper wall of the buffer cavity 19, the lower end of the elastic sheet is bent towards the buffer head 20, and the side wall of the buffer head 20 is provided with a friction pair 21 which is in sliding friction with the elastic sheet 22; an air bag 23 is arranged between the elastic sheet 22 and the side wall of the buffer cavity 19. When the first rod 10 moves downwards in the buffer cavity 19 through the buffer head 20, the first rod is subjected to the friction force between the friction pair 21 and the elastic sheet 22, the elastic force generated by the deformation of the elastic sheet 22 and the reaction force generated by the compression of the air bag 23, so that various energy absorption modes are generated at the same time, the vibration energy of the motor body 1 is effectively reduced, and the damping effect is greatly improved.

In one embodiment of the present invention, the buffer head 20 is provided with a second air hole 11 arranged vertically, and the second air hole 11 penetrates the first rod 10, the top plate 4 and the mounting leg 2 in this order and the injection direction thereof faces the motor body 1. Through the setting of second gas pocket 11, on the one hand, can move down the gas in the compression cushion chamber 19 through buffer head 20 and make this part gas discharge through second gas pocket 11, the peripheral air flow of motor body 1 accelerates, improve motor body 1's heat dispersion, on the other hand, vibrations second gas pocket 11 at every turn all has the air flow, and then can take away the heat of damping oil in first chamber 12 through the mode of first pole 10 heat transfer, avoid damping oil to lead to its viscidity resistance to reduce because of using the condition that heaies up for a long time, consequently, make to have better shock attenuation effect in the first chamber 12 all the time, the stability of motor body 1 during operation has been improved.

When the motor is used, the mounting feet 2 of the motor body 1 are fixedly connected with the top plate 4 through the bolts 3, and due to the arrangement of the first springs 7, when the motor body 1 works, vertical pressure generated by the motor body can compress the first springs 7 through the top plate 4, so that impact force on the top plate 4 is dredged, severe vibration or huge noise of the top plate 4 caused by impact force generated on the top plate 4 is avoided, the damping effect is very good, and the working stability of the motor body 1 is improved; the guide post 6 is inserted into the guide groove, so that the transverse impact force generated when the motor body 1 works can be counteracted, the motor body 1 is forced to vibrate only in the vertical direction, the probability of overturning caused by large vibration amplitude of one side of the motor body 1 is reduced, and the service life is prolonged; the first rod 10 can transmit impact force generated by vibration of the motor body 1 driving the top plate 4 to the first piston 13, so that the first piston 13 moves up and down in the first cavity 12, and the first piston 13 is in sealing fit with the side wall of the first cavity 12, so that damping oil on the upper side and the lower side of the first piston 13 can only circulate through the damping hole 14, and no matter the first piston 13 moves up or down, the direction of the damping force generated by the damping oil is always opposite to the movement trend of the motor body 1, so that the vibration strength of the motor body 1 is reduced, the damping effect is very good, and the stability of the motor body 1 during working is improved; through the arrangement of the second rod 16, when the first rod 10 is pressed to move downwards to drive the first piston 13 to move downwards, because the lower part of the first piston 13 is in a truncated cone shape with a large upper part and a small lower part, the first piston 13 can gradually extrude the second rod 16 into the second cavity 15, and further the second piston 17 moves towards one side of the first air hole 8 by overcoming the elasticity of the second spring 18, so that not only is the vertical impact force on the first piston 13 converted into a plurality of horizontal component forces and the second spring 18 is used for damping and dissipating energy, but also the secondary damping effect is achieved, the secondary damping effect is improved, the second piston 17 is also realized for compressing and discharging the air in the second cavity 15, and the high-speed air flow is directly blown to the motor body 1, so that the heat dissipation performance is improved; because the radius of the first air hole 8 is gradually reduced from inside to outside, when the first air hole 8 exhausts air, the speed of the ejected air flow is high, and the heat dissipation effect of the motor body 1 is improved; on the contrary, when the first air hole 8 inhales air, the radius of the outer side is smaller, so that the first air hole 8 inhales air slowly, the second piston 17 is reset slowly, the pressure in the first cavity 12 is negative pressure, and the movement of the first piston 13 is delayed, so that the first piston 13 can be reset slowly after finishing shock absorption and buffering when being subjected to severe downward impact force, the rebound collision damage caused by quick reset is avoided, and the service life is prolonged; when the first rod 10 moves downwards in the buffer cavity 19 through the buffer head 20, the friction force between the friction pair 21 and the elastic sheet 22, the elastic force generated by the deformation of the elastic sheet 22 and the reaction force generated by the compression of the air bag 23 are applied to the first rod, so that a plurality of energy absorption modes are generated in the same time, the vibration energy of the motor body 1 is effectively reduced, and the damping effect is greatly improved; through the setting of second gas pocket 11, on the one hand, can move down the gas in the compression cushion chamber 19 through buffer head 20 and make this part gas discharge through second gas pocket 11, the peripheral air flow of motor body 1 accelerates, improve motor body 1's heat dispersion, on the other hand, vibrations second gas pocket 11 at every turn all has the air flow, and then can take away the heat of damping oil in first chamber 12 through the mode of first pole 10 heat transfer, avoid damping oil to lead to its viscidity resistance to reduce because of using the condition that heaies up for a long time, consequently, make to have better shock attenuation effect in the first chamber 12 all the time, the stability of motor body 1 during operation has been improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The permanent magnet variable frequency motor for the pump is characterized by comprising a motor body (1) and a damping device, wherein a mounting foot (2) is fixedly arranged at the lower end of the motor body (1), and the mounting foot (2) is detachably connected with the upper end of the damping device through a bolt (3); the damping device comprises a top plate (4), a damping block (5) and a bottom plate (9) which are sequentially arranged from top to bottom, and the mounting feet (2) are detachably connected with the top plate (4) through bolts (3); a plurality of groups of first springs (7) are arranged between the top plate (4) and the damping block (5), the first springs (7) are arranged along the edge of the upper end of the damping block (5), guide posts (6) which are vertically arranged are fixedly arranged at the lower end of the top plate (4), the guide posts (6) are arranged in the corresponding first springs (7), and guide grooves matched with the guide posts (6) are correspondingly arranged at the upper end of the damping block (5); a first cavity (12) is arranged in the damping block (5), a first rod (10) is arranged in the first cavity (12), a first piston (13) is fixedly connected to the outer wall of the first rod (10), the first piston (13) is in sealing fit with the side wall of the first cavity (12) and can move up and down along with the action of the first rod (10), and the upper end of the first rod (10) penetrates through the damping block (5) to extend to the lower end of the top plate (4) and is fixedly connected with the lower end of the top; the first piston (13) is provided with a plurality of damping holes (14) penetrating through the first piston, and the first cavity (12) is filled with damping oil; a plurality of second cavities (15) which are horizontally arranged are arranged on the side wall of the first cavity (12), second pistons (17) are correspondingly arranged in the second cavities (15), and second rods (16) are fixedly arranged on one sides, facing the first cavity (12), of the second pistons (17); the lower part of the first piston (13) is in a cone frustum shape with a large upper part and a small lower part, and the second rod (16) extends into the first cavity (12) and is abutted against the side wall of the lower part of the first piston (13); a second spring (18) which is abutted against the second piston (17) is arranged on one side of the rodless cavity of the second cavity (15), and a first air hole (8) communicated with the outside is arranged on one side of the rodless cavity, which is far away from the second piston (17); the radius of the first air hole (8) is gradually reduced from inside to outside, the first air hole (8) is obliquely and upwards arranged, and the spraying direction of the first air hole faces the motor body (1).

2. The permanent magnet variable frequency motor for the pump according to claim 1, wherein a buffer cavity (19) is arranged in the bottom plate (9), a buffer head (20) is arranged in the buffer cavity (19), the lower end of the first rod (10) passes through the damping block (5) and extends into the buffer cavity (19) to be fixedly connected with the buffer head (20), and elastic sheets (22) are symmetrically arranged in the buffer cavity (19) at two sides of the buffer head (20); the upper end of the elastic sheet (22) is fixed on the upper wall of the buffer cavity (19), the lower end of the elastic sheet is bent towards the buffer head (20), and a friction pair (21) which is in sliding friction with the elastic sheet (22) is arranged on the side wall of the buffer head (20); an air bag (23) is arranged between the elastic sheet (22) and the side wall of the buffer cavity (19).

3. The permanent magnet variable frequency motor for the pump according to claim 2, wherein the buffer head (20) is provided with a second air hole (11) which is arranged up and down, the second air hole (11) penetrates through the first rod (10), the top plate (4) and the mounting leg (2) in sequence, and the spraying direction of the second air hole faces the motor body (1).