CN111953119A - Special explosion-proof motor for plunger pump and process - Google Patents
Special explosion-proof motor for plunger pump and process Download PDFInfo
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- CN111953119A CN111953119A CN202010787618.2A CN202010787618A CN111953119A CN 111953119 A CN111953119 A CN 111953119A CN 202010787618 A CN202010787618 A CN 202010787618A CN 111953119 A CN111953119 A CN 111953119A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/136—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas explosion-proof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/14—Casings; Enclosures; Supports
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/163—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at only one end of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1735—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention discloses a special explosion-proof motor for a plunger pump and a process thereof, wherein the explosion-proof motor comprises a motor stator, a motor rotor and a base, the motor stator is arranged in the base, and the motor rotor is arranged on the inner side of the motor stator; the device also comprises a front axle supporting structure and a base plate of the machine base; a motor shaft is arranged in the motor rotor, a belt pulley is sleeved on the motor shaft, and the front end of the motor shaft penetrates out of the front end of the belt pulley and is connected with a front shaft supporting structure; the processing technology of the explosion-proof motor processes the base plate of the base of the explosion-proof motor through a vertical milling machine; the explosion-proof motor is additionally provided with the unique front shaft support structure, so that the stress form of the motor shaft is changed from the existing cantilever beam to a simply supported beam, the stress of the motor shaft is reasonable, the overload capacity is enhanced, and the quality is guaranteed; the upper end surface and the lower end surface of the base foot plate of the machine base are processed by the vertical milling machine under the auxiliary action of the auxiliary processing device so as to ensure that the parallelism requirements of the upper end surface and the lower end surface of the base foot plate of the machine base are met.
Description
Technical Field
The invention relates to a motor and a process, in particular to an explosion-proof motor special for a plunger pump and a process.
Background
The plunger pump is a power element commonly used in a hydraulic system, and the volume change of a working cavity of hydraulic oil is caused by the reciprocating motion of a plunger in a cylinder body, so that oil absorption and oil pressing are realized; the plunger pump is widely applied to occasions with high pressure and large flow because of high rated pressure and high efficiency.
Along with the increase of the output torque required by the plunger pump, the single-machine capacity of the motor adopted by the plunger pump is increased; the traditional connection mode between motor and the plunger pump is belt pulley connection, and the belt pulley sets up on the motor shaft of motor. Because the output torque required by the plunger pump is increased, the original four or six belts in the belt pulley connection can not meet the operation requirement, and the number of the belts needs to be increased to meet the requirement of the output torque required by the plunger pump; in addition, due to the space limitation of the working environment of the plunger pump, the connection mode between the motor and the plunger pump is not allowed to be changed from belt pulley connection to coupling connection, and the coupling connection connects the plunger pump and the motor on the same axis, so that the equipment is overlong in length and has higher space requirement on the working environment, and the connection mode between the plunger pump and the motor still adopts belt pulley connection in order to save the space of the working environment of the plunger pump; therefore, the number of belts in the belt pulley connection is increased along with the increase of the output torque required by the plunger pump; in the in-service use process of plunger pump motor, because the belt radical is too much, generally exceed twelve, it is longer to cause the motor shaft of motor to stretch out the frame, because the belt pulley sets up on the motor shaft, under the pulling force effect of belt pulley self weight and belt, causes the motor shaft to become the cantilever beam structure, and this has provided very high requirement to the intensity of motor shaft.
The current solution adopted by motor factories aiming at the situation is to thicken the shaft diameter of the motor shaft and enlarge the bearing so as to increase the shearing strength of the shaft, and to change the tool withdrawal groove on the shaft into R-angle processing so as to reduce the stress concentration. However, the motor shaft processed and produced by the solution method can only normally operate for a short time, the motor shaft is very frequently broken along with the increase of the service life of the motor, the shaft breakage rate of the motor shaft reaches 60% -70% within two months of operation of the motor shaft, the shaft breakage rate of the motor shaft reaches about 95% within the motor maintenance period (generally, one year), and the normal operation of the motor for the plunger pump is seriously influenced by the frequent shaft breakage of the motor shaft, so that great economic loss is caused.
Disclosure of Invention
In order to solve the defects of the technology, the invention provides the special explosion-proof motor for the plunger pump and the process thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: an explosion-proof motor special for a plunger pump comprises a motor stator, a motor rotor and a base, wherein the motor stator is arranged inside the base; the device also comprises a front axle supporting structure and a base plate of the machine base; a motor shaft is transversely arranged in the motor rotor, a belt pulley is sleeved on the motor shaft, and the front end of the motor shaft penetrates out of the front end of the belt pulley and is connected with a front shaft supporting structure;
the base foot plate of the machine base is fixedly arranged below the machine base, and the machine base is positioned at the rear part of the base foot plate of the machine base; the front shaft supporting structure comprises a front supporting seat, and the front end of the base plate of the machine base extends forwards to the lower part of the front shaft supporting structure and is connected with the front supporting seat;
the front end and the rear end of the base are respectively provided with a front bearing and a rear bearing, and the rear part of the motor shaft is connected with the rear bearing; a front support bearing is arranged on the inner side of the front support seat, and the front end of the motor shaft penetrates through the front bearing forwards and then is connected with the front support bearing;
the junction box is arranged at the upper part of the base and comprises a junction box cover and a junction box base, the junction box base is arranged at the upper part of the base, and the junction box cover is arranged at the upper part of the junction box base; the lower part of the junction box cover is provided with a seam allowance, and the outer side wall of the seam allowance and the inner side wall of the junction box base form an explosion-proof joint surface A together; the bottom surface of the junction box cover and the top surface of the junction box base jointly form an explosion-proof joint surface B; the flameproof joint surface A, the flameproof joint surface B and the flameproof joint surface C are matched together to prevent sparks generated inside the motor from being conducted to the outside of the motor when the motor works, and the flameproof effect is achieved.
Furthermore, a positioning shield is arranged between the front support seat and the front end of the base, and the belt pulley is sleeved on the motor shaft and positioned inside the positioning shield; the upper end of the rear side wall of the front supporting seat is provided with a positioning step, the upper part of the front end of the positioning protective cover is connected with the positioning step, and the positioning protective cover is provided with a positioning function so as to ensure the concentricity between the belt pulley and the motor shaft in the installation process of the front shaft supporting structure.
Furthermore, the front end of the engine base is provided with a front end cover, and a front bearing is arranged on the front end cover; a front bearing outer cover is arranged on the front side of the front bearing, a front bearing inner cover is arranged on the rear side of the front bearing, and the front bearing outer cover and the front bearing inner cover are both sleeved on the motor shaft; the surface of the shaft hole of the inner cover of the front bearing and the surface of the motor shaft jointly form an explosion-proof joint surface C.
And an O-shaped sealing ring is arranged between the front end cover and the base.
Furthermore, the front support bearing is a self-aligning ball bearing.
Furthermore, the rear end of the engine base is provided with a rear end cover, and a rear bearing is arranged on the rear end cover; a rear bearing inner cover is arranged on the front side of the rear bearing, a rear bearing outer cover is arranged on the rear side of the rear bearing, and the rear bearing inner cover and the rear bearing outer cover are both sleeved on the motor shaft; the rear end of the motor shaft passes through the rear bearing outer cover backwards and then is connected with an outer fan.
Furthermore, an internal circulation fan is arranged on a motor shaft and is positioned between the motor rotor and the rear bearing.
Furthermore, a fan cover is arranged at the rear part of the base, and the outer fan is positioned at the inner side of the fan cover.
A processing technology of an explosion-proof motor special for a plunger pump is characterized in that a base foot plate of a machine base of the explosion-proof motor special for the plunger pump is processed through a vertical milling machine, and an auxiliary processing device is arranged on a workbench of the vertical milling machine; placing the base foot plate of the machine base and the machine base fixedly connected with the base foot plate on an auxiliary processing device, and processing the upper end surface and the lower end surface of the base foot plate of the machine base by a vertical milling machine under the auxiliary action of the auxiliary processing device so as to ensure that the parallelism requirement of the upper end surface and the lower end surface of the base foot plate of the machine base is met;
the processing technology comprises the following steps:
a: processing the lower end surface of the base plate of the machine base; firstly, vertically placing a base on a base plate milling clamping fixture of the base, adjusting the lower end surface of the base plate of the base through a base plate positioning device to enable the lower end surface of the base plate of the base to be in a parallel position with a rotary disc milling cutter on a vertical milling machine, and hinging the base plate positioning device on the base plate milling clamping fixture of the base; then the base is fixed by a base fixing device which is arranged above the base; a rotary disc milling cutter on the vertical milling machine performs plane milling processing on the lower end face of the base plate of the machine base;
b: processing the upper end surface of the base plate of the machine base; loosening the base fixing device, horizontally rotating the base by 180 degrees, and matching the base bottom plate positioning device with the lower end surface of the processed base bottom plate to adjust the position of the base so that the upper end surface of the base bottom plate is parallel to a rotary disc milling cutter on the vertical milling machine; the base is fixed again through the base fixing device, and a rotary disc milling cutter on the vertical milling machine performs milling plane processing on the upper end face of the base plate of the base.
Furthermore, the machine base fixing device comprises a machine base fixing cross beam, a supporting block and a pressing bolt, wherein one end of the machine base fixing cross beam protrudes downwards to form a fixing block, and the bottom surface of the other end of the machine base fixing cross beam is fixedly connected with the supporting block; the compression bolt is vertically arranged in the middle of the base fixing cross beam, the lower end of the compression bolt penetrates through the base fixing cross beam and then is matched with the front end face of the base, and the upper end of the compression bolt is provided with a locking nut; the lower part of the fixed block is provided with a clamping groove, and the fixed block is clamped with a reinforcing cross beam arranged on the base foot plate of the machine base through the clamping groove.
The explosion-proof motor is additionally provided with the unique front shaft support structure, so that the stress form of the motor shaft is changed from the existing cantilever beam to a simply supported beam, the stress of the motor shaft is reasonable, the overload capacity is enhanced, and the quality is guaranteed; the upper end surface and the lower end surface of the base foot plate of the machine base are processed by the vertical milling machine under the auxiliary action of the auxiliary processing device so as to meet the requirement of parallelism of the upper end surface and the lower end surface of the base foot plate of the machine base and further ensure that the front support bearing is coaxial with the motor shaft, the front bearing and the rear bearing.
Drawings
Fig. 1 is a schematic structural view of an explosion-proof motor specially used for a plunger pump of the present invention.
Fig. 2 is a schematic structural view of the junction box.
Fig. 3 is a schematic diagram of the position relationship between the auxiliary processing device and the base bottom plate of the motor.
Fig. 4 is a schematic structural diagram of a motor for a plunger pump in the prior art.
Fig. 5 is a schematic view illustrating stress analysis of a motor shaft of a motor for a plunger pump in the related art.
FIG. 6 is a schematic diagram showing the positional relationship between the motor shaft and the pulley of the explosion-proof motor for plunger pump of the present invention.
Fig. 7 is a schematic view of stress analysis of a motor shaft of the explosion-proof motor special for the plunger pump.
In the figure: 1. a motor stator; 2. a motor rotor; 3. a machine base; 4. a motor shaft; 5. a front bearing; 6. a rear bearing; 7. a front support bearing; 8. a front support base; 9. a base plate of the machine base; 10. positioning a shield; 11. a belt pulley; 12. positioning a step; 13. a junction box; 14. a junction box cover; 15. a terminal box base; 16. stopping the opening; 17. an explosion-proof joint surface A; 18. an explosion-proof joint B; 19. an explosion-proof joint surface C; 20. an O-shaped sealing ring; 21. a front bearing outer cover; 22. a front bearing inner cover; 23. a front end cover; 24. a rear end cap; 25. a rear bearing inner cap; 26. a rear bearing outer cover; 27. an external fan; 28. a fan housing; 29. an internal circulation fan; 30. milling a clamping fixture for a base plate of the stand; 31. a base plate positioning device of the machine base; 32. a machine base fixing device; 34. a support block; 35. a fixed block; 36. a hold-down bolt; 37. locking the nut; 38. a reinforcing cross beam; 39. a front support cover; 40. a front support inner cover; 41. a belt pulley A; 42. a motor shaft A; 43. the base plate A of the engine base.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an explosion-proof motor dedicated for a plunger pump comprises a motor stator 1, a motor rotor 2 and a base 3, wherein the motor stator 1 is arranged inside the base 3, and the motor rotor 2 is arranged inside the motor stator 1; the device also comprises a front axle supporting structure and a base plate 9 of the machine base; a motor shaft 4 is transversely arranged in the motor rotor 2, a belt pulley 11 is sleeved on the motor shaft 4, and the front end of the motor shaft 4 penetrates out of the front end of the belt pulley and is connected with a front shaft supporting structure;
the base foot plate 9 of the engine base is fixedly arranged below the engine base 3, and the engine base 3 is positioned at the rear part of the base foot plate 9 of the engine base; the front shaft supporting structure comprises a front supporting seat 8, and the front end of a base plate 9 of the machine base extends forwards to the lower part of the front shaft supporting structure and is connected with the front supporting seat 8;
the front end and the rear end of the base 3 are respectively provided with a front bearing 5 and a rear bearing 6, and the rear part of the motor shaft 4 is connected with the rear bearing 6; a front support bearing 7 is arranged on the inner side of the front support seat 8, and the front end of the motor shaft 4 penetrates through the front bearing 5 forwards and then is connected with the front support bearing 7;
a positioning shield 10 is arranged between the front support seat 8 and the front end of the base 3, and the belt pulley 11 is sleeved on the motor shaft 4 and is positioned inside the positioning shield 10; the upper end of the rear side wall of the front supporting seat 8 is provided with a positioning step 12, the upper part of the front end of the positioning protective cover 10 is connected with the positioning step 12, and the positioning function is added by the positioning protective cover so as to ensure the concentricity with a motor shaft in the installation process of the belt pulley and the front shaft supporting structure.
The rear end of the engine base 3 is provided with a rear end cover 24, and the rear bearing 6 is arranged on the rear end cover 24; a rear bearing inner cover 25 is arranged on the front side of the rear bearing 6, a rear bearing outer cover 26 is arranged on the rear side of the rear bearing, and the rear bearing inner cover and the rear bearing outer cover are both sleeved on the motor shaft; the rear end of the motor shaft 4 passes through the rear bearing cover 26 rearward and is connected to an external fan 27. The motor shaft 4 is provided with an internal circulation fan 29, and the internal circulation fan 29 is positioned between the motor rotor 2 and the rear bearing 6. The rear part of the base 3 is provided with a fan housing 28, and the outer fan 27 is positioned inside the fan housing.
A processing technology of an explosion-proof motor special for a plunger pump processes a base foot plate 9 of a machine base of the explosion-proof motor special for the plunger pump through a vertical milling machine, and an auxiliary processing device is arranged on a workbench of the vertical milling machine; as shown in fig. 3, the base foot plate 9 and the base 3 fixedly connected with the base foot plate are placed on the auxiliary processing device, and the upper end surface and the lower end surface of the base foot plate 9 are processed by the vertical milling machine under the auxiliary action of the auxiliary processing device, so as to ensure that the parallelism requirements of the upper end surface and the lower end surface of the base foot plate 9 are met, and the front support bearing is coaxial with the motor shaft, the front bearing and the rear bearing.
The processing technology comprises the following steps:
a: processing the lower end surface of the base foot plate 9 of the machine base; firstly, a machine base 3 is vertically placed on a machine base foot plate milling clamping fixture 30, an outer spigot is arranged on the top surface of the machine base foot plate milling clamping fixture 30, an inner spigot is arranged in a rear port of the machine base 3, when the machine base 3 is vertically placed on the top surface of the machine base foot plate milling clamping fixture 30, the inner spigot at the rear port of the machine base 3 is matched with the outer spigot on the top surface of the machine base foot plate milling clamping fixture 30, and the horizontal position of the machine base 3 on the machine base foot plate milling clamping fixture 30 is limited;
the lower end surface of the base foot plate 9 of the machine base is adjusted through the base foot plate positioning device 31, so that the lower end surface of the base foot plate 9 of the machine base is parallel to a rotary disc milling cutter on a vertical milling machine, and the base foot plate positioning device 31 of the machine base is hinged to a base foot plate milling clamping fixture 30; then the base 3 is fixed by the base fixing device 32, and the base fixing device 32 is arranged above the base 3; a rotary disc milling cutter on the vertical milling machine performs plane milling processing on the lower end face of the base foot plate 9 of the machine base;
b: processing the upper end surface of the base foot plate 9 of the machine base; loosening the base fixing device 32, horizontally rotating the base 3 by 180 degrees, and matching the base foot plate positioning device 31 with the lower end surface of the processed base foot plate 9 to adjust the position of the base 3, so that the upper end surface of the base foot plate 9 is parallel to a rotary disc milling cutter on the vertical milling machine; the base 3 is fixed again by the base fixing device 32, and the upper end face of the base foot plate 9 of the base is milled and processed by a rotary disc milling cutter on the vertical milling machine.
The invention firstly carries out plane milling processing on the lower end surface of the base foot plate 9 of the machine base, and then adjusts the position of the machine base by matching the processed lower end surface of the base foot plate 9 of the machine base with the base foot plate positioning device so as to ensure the parallelism between the upper end surface and the lower end surface of the base foot plate of the machine base after the plane milling processing.
The machine base fixing device 32 comprises a machine base fixing cross beam, a supporting block 34 and a pressing bolt 36, wherein one end of the machine base fixing cross beam protrudes downwards to form a fixing block 35, and the bottom surface of the other end of the machine base fixing cross beam is fixedly connected with the supporting block 34; the compression bolt 36 is vertically arranged in the middle of the base fixing cross beam, the lower end of the compression bolt 36 penetrates through the base fixing cross beam and then is matched with the front end face of the base 3, and the upper end of the compression bolt is provided with a locking nut 37; the lower part of the fixed block 35 is provided with a clamping groove, and the fixed block is clamped with a reinforcing cross beam 38 arranged on the base plate 9 of the machine base through the clamping groove.
When the base is fixed, the pressing bolt is rotated to enable the pressing bolt to press the base downwards, and the lower end face of the supporting block is in contact with the front end face of the base to play a supporting role; when the base needs to be loosened, the pressing bolt is rotated to enable the pressing bolt to move upwards to loosen the base.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a motor for a plunger pump in the prior art, a belt pulley a is disposed on a motor shaft a, and under the tensile force action of the belt pulley a and a belt, the motor shaft a is in a cantilever beam structure, the motor shaft a is very frequently broken along with the increase of the service life of the motor, the axial breakage rate of the motor shaft a reaches 60% -70% within two months of the operation of the motor shaft a, and the axial breakage rate of the motor shaft a reaches about 95% within a motor maintenance period (generally, one year), and the normal operation of the motor for the plunger pump is seriously influenced by the frequent axial breakage of the motor shaft a, which causes great economic loss. Fig. 5 is a schematic diagram of a stress analysis of a motor shaft of a motor for a plunger pump in the prior art, and fig. 5 shows the yield strength of the motor shaft a of the belt pulley a on the motor shaft a under the action of 12 belts, wherein the stress of a single belt is 120 kg; the "von mises" in the stress analysis diagram of the motor shaft a is a von mises criterion, which is a yield criterion that can be used to evaluate fatigue, failure, etc.; the content of it is: when the equivalent stress strain of a certain point stress strain state reaches a certain fixed value related to the stress strain state, the material yields; the analyst can quickly determine the most dangerous areas in the model through this yield criterion. From the data in FIG. 5, it can be seen that the maximum yield strength of the motor shaft A is about 381 MPa.
As shown in fig. 6, compared with the motor shaft a of the motor for the plunger pump in the prior art, the motor shaft of the explosion-proof motor special for the plunger pump of the present invention is lengthened, and the base plate of the base is also lengthened and extended to the lower part of the front end of the motor shaft; the front shaft support structure is arranged at the front end of the motor shaft, so that the operation mode of the motor shaft is changed from a cantilever beam in the prior art to a simply supported beam, the stress of the motor shaft is reasonable, the overload capacity is high, and the failure rate and the shaft breakage rate of the motor shaft in the working process are greatly reduced. As shown in fig. 7, fig. 7 is a schematic view of a stress analysis of a motor shaft of the explosion-proof motor dedicated for the plunger pump of the present invention, fig. 7 shows a yield strength of the motor shaft of the pulley on the motor shaft under the action of 12 belts, and a stress of a single belt is 120 kg; from the data in fig. 7, it can be seen that the maximum yield strength of the motor shaft is about 75 Mpa.
The material of a motor shaft of the existing motor generally selects 45 steel, the yield strength of the 45 steel is 355Mpa, the maximum yield strength of the motor shaft A in the prior art is 381Mpa and is greater than the yield strength of the 45 steel of 355Mpa in the working process, so that about 70% of the motor shaft A in the prior art is broken in 1-2 months of operation in the actual use process, and the rest of the motor shaft A continuously breaks down in 1 year of operation of the motor. From the analysis of the stress of the motor shaft A, the motor shaft A is in an extreme state, and great hidden danger exists; the special explosion-proof motor for the plunger pump is lengthened, the front shaft support structure is arranged at the front end of the motor shaft, so that the motor shaft is changed from an original cantilever beam to a simple beam, the yield strength of the motor shaft is obviously reduced, and the special explosion-proof motor for the plunger pump has no shaft breakage phenomenon from the practical operation condition of nearly two years, and effectively ensures the stable operation of the motor.
When the motor for the plunger pump works in a humid working environment, such as a coal washing occasion, the working environment is filled with water vapor and explosive mixtures, and when the motor works, the electrified part in the motor is easy to generate sparks in the working process, so that higher requirements are provided for the safety of the motor. As shown in fig. 2, the explosion-proof motor of the present invention has an excellent explosion-proof function, a terminal box 13 is disposed on the upper portion of the base 3, the terminal box 13 includes a terminal box cover 14 and a terminal box base 15, the terminal box base 15 is disposed on the upper portion of the base 3, and the terminal box cover 14 is disposed on the upper portion of the terminal box base 15; the junction box has the function of isolating sparks and electric arcs generated by electric components in the box from explosive mixtures outside the box, can bear the explosive pressure generated when the explosive mixtures entering the box are ignited by the sparks and the electric arcs of the electric components in the box, is not damaged, can prevent explosive products in the box from exploding to the explosive mixtures outside the box, and cannot cause the explosive mixtures outside the box to be burnt and exploded.
The lower part of a junction box cover 14 is provided with a seam allowance 16, the outer side wall of the seam allowance 16 and the inner side wall of a junction box base 15 jointly form an explosion-proof joint surface A17, namely the seam allowance is explosion-proof; the bottom surface of the junction box cover 14 and the top surface of the junction box base 15 jointly form an explosion-proof joint B18, namely, the plane explosion-proof joint is a plane explosion-proof joint. The explosion-proof junction surface A17 and the growing explosion-proof junction surface B18 are formed to realize the explosion-proof between the junction box cover and the junction box base and realize the explosion-proof of the junction box.
The front end of the engine base 3 is provided with a front end cover 23, and the front bearing 5 is arranged on the front end cover 23; a front bearing outer cover 21 is arranged on the front side of the front bearing 5, a front bearing inner cover 22 is arranged on the rear side of the front bearing, and the front bearing outer cover and the front bearing inner cover are both sleeved on the motor shaft; the shaft hole surface of the front bearing inner cover 22 and the motor shaft surface jointly form an explosion-proof joint surface C19, spark generated in the operation process of the motor is prevented from being conducted to the outside of the motor by increasing the explosion-proof joint surface C19, once the motor generates spark in the operation process, the spark can be extinguished midway along the outward conducting process of the explosion-proof joint surface C19, the spark can not be conducted to the outside of the motor, and external secondary explosion caused by the spark generated in the motor is avoided.
An O-shaped sealing ring 20 is arranged between a front end cover 23 and a base 3, the O-shaped sealing ring plays a role in sealing between the front end cover of the motor and the base, moisture in a moist working environment is prevented from entering the motor to cause burning of a motor coil when the motor is in live operation, and the protection performance of the explosion-proof motor is effectively improved.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make variations, modifications, additions or substitutions within the technical scope of the present invention.
Claims (10)
1. An explosion-proof motor special for a plunger pump comprises a motor stator (1), a motor rotor (2) and a base (3), wherein the motor stator (1) is arranged inside the base (3), and the motor rotor (2) is arranged on the inner side of the motor stator (1); the method is characterized in that: the device also comprises a front axle supporting structure and a base plate (9) of the machine base; a motor shaft (4) is transversely arranged in the motor rotor (2), a belt pulley (11) is sleeved on the motor shaft (4), and the front end of the motor shaft (4) penetrates out of the front end of the belt pulley and is connected with a front shaft supporting structure;
the base foot plate (9) of the engine base is fixedly arranged below the engine base (3), and the engine base (3) is positioned at the rear part of the base foot plate (9) of the engine base; the front shaft supporting structure comprises a front supporting seat (8), and the front end of a base plate (9) of the base extends forwards to the lower part of the front shaft supporting structure and is connected with the front supporting seat (8);
the front end and the rear end of the base (3) are respectively provided with a front bearing (5) and a rear bearing (6), and the rear part of the motor shaft (4) is connected with the rear bearing (6); a front support bearing (7) is arranged on the inner side of the front support seat (8), and the front end of the motor shaft (4) penetrates through the front bearing (5) forwards and then is connected with the front support bearing (7);
a junction box (13) is arranged at the upper part of the base (3), the junction box (13) comprises a junction box cover (14) and a junction box base (15), the junction box base (15) is arranged at the upper part of the base (3), and the junction box cover (14) is arranged at the upper part of the junction box base (15) in a covering manner; a spigot (16) is arranged at the lower part of the junction box cover (14), and the outer side wall of the spigot (16) and the inner side wall of the junction box base (15) jointly form an explosion-proof joint surface A (17); the bottom surface of the junction box cover (14) and the top surface of the junction box base (15) jointly form an explosion-proof joint surface B (18); the flameproof joint surface A, the flameproof joint surface B and the flameproof joint surface C are matched together to prevent sparks generated inside the motor from being conducted to the outside of the motor when the motor works, and the flameproof effect is achieved.
2. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: a positioning protective cover (10) is arranged between the front supporting seat (8) and the front end of the base (3), and a belt pulley (11) is sleeved on the motor shaft (4) and is positioned inside the positioning protective cover (10); the upper end of the rear side wall of the front supporting seat (8) is provided with a positioning step (12), the upper part of the front end of the positioning protective cover (10) is connected with the positioning step (12), and the positioning protective cover is arranged to increase the positioning function so as to ensure the concentricity with a motor shaft in the installation process of the belt pulley and the front shaft supporting structure.
3. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: a front end cover (23) is arranged at the front end of the base (3), and a front bearing (5) is arranged on the front end cover (23); a front bearing outer cover (21) is arranged on the front side of the front bearing (5), a front bearing inner cover (22) is arranged on the rear side of the front bearing, and the front bearing outer cover and the front bearing inner cover are both sleeved on the motor shaft; the surface of the shaft hole of the front bearing inner cover (22) and the surface of the motor shaft jointly form an explosion-proof joint surface C (19).
4. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: an O-shaped sealing ring (20) is arranged between the front end cover (23) and the machine base (3).
5. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: the front support bearing (7) is a self-aligning ball bearing.
6. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: a rear end cover (24) is arranged at the rear end of the machine base (3), and a rear bearing (6) is arranged on the rear end cover (24); a rear bearing inner cover (25) is arranged on the front side of the rear bearing (6), a rear bearing outer cover (26) is arranged on the rear side of the rear bearing, and the rear bearing inner cover and the rear bearing outer cover are both sleeved on the motor shaft; the rear end of the motor shaft (4) passes through the rear bearing outer cover (26) backwards and then is connected with an outer fan (27).
7. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: an internal circulation fan (29) is arranged on the motor shaft (4), and the internal circulation fan (29) is positioned between the motor rotor (2) and the rear bearing (6).
8. The explosion-proof motor special for the plunger pump according to claim 1, characterized in that: the rear part of the base (3) is provided with a fan cover (28), and the outer fan (27) is positioned on the inner side of the fan cover.
9. A processing technology of the special explosion-proof motor for the plunger pump according to any one of claims 1 to 5, characterized in that: the process comprises the steps that a base foot plate (9) of an explosion-proof motor special for a plunger pump is machined through a vertical milling machine, and an auxiliary machining device is arranged on a workbench of the vertical milling machine; placing a base foot plate (9) of the machine base and a machine base (3) fixedly connected with the base foot plate on an auxiliary processing device, and processing the upper end surface and the lower end surface of the base foot plate (9) of the machine base through a vertical milling machine under the auxiliary action of the auxiliary processing device so as to ensure that the parallelism requirements of the upper end surface and the lower end surface of the base foot plate (9) of the machine base are met;
the processing technology comprises the following steps:
a: processing the lower end surface of a base foot plate (9) of the machine base; firstly, a base (3) is vertically placed on a base foot plate milling clamping fixture (30) of the base, the lower end surface of a base foot plate (9) of the base is adjusted through a base foot plate positioning device (31), so that the lower end surface of the base foot plate (9) is parallel to a rotary disc milling cutter on a vertical milling machine, and the base foot plate positioning device (31) of the base is hinged to the base foot plate milling clamping fixture (30); then the base (3) is fixed through a base fixing device (32), and the base fixing device (32) is arranged above the base (3); a rotary disc milling cutter on the vertical milling machine performs plane milling processing on the lower end face of a base foot plate (9) of the machine base;
b: processing the upper end surface of a base foot plate (9) of the machine base; loosening the base fixing device (32), horizontally rotating the base (3) for 180 degrees, and matching the base bottom plate positioning device (31) with the lower end surface of the processed base bottom plate (9) to adjust the position of the base (3) so that the upper end surface of the base bottom plate (9) is parallel to a rotary disc milling cutter on the vertical milling machine; the base (3) is fixed again through the base fixing device (32), and a rotary disc milling cutter on the vertical milling machine performs milling plane processing on the upper end face of the base foot plate (9) of the base.
10. The processing technology of the special explosion-proof motor for the plunger pump according to claim 9, characterized in that: the machine base fixing device (32) comprises a machine base fixing cross beam (), a supporting block (34) and a pressing bolt (36), one end of the machine base fixing cross beam () protrudes downwards to form a fixing block (35), and the bottom surface of the other end of the machine base fixing cross beam () is fixedly connected with the supporting block (34); the pressing bolt (36) is vertically arranged in the middle of the base fixing cross beam (), the lower end of the pressing bolt (36) penetrates through the base fixing cross beam (), then is matched with the front end face of the base (3), and the upper end of the pressing bolt is provided with a locking nut (37); the lower part of the fixed block (35) is provided with a clamping groove, and the fixed block is clamped with a reinforcing cross beam (38) arranged on the base plate (9) of the machine base through the clamping groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010787618.2A CN111953119B (en) | 2020-08-07 | 2020-08-07 | Explosion-proof motor special for plunger pump and process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010787618.2A CN111953119B (en) | 2020-08-07 | 2020-08-07 | Explosion-proof motor special for plunger pump and process |
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| CN111953119B CN111953119B (en) | 2023-03-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714794A (en) * | 2009-08-18 | 2010-05-26 | 焦作市银星制动器有限公司 | Dual high voltage flameproof motor |
| CN104009579A (en) * | 2014-06-12 | 2014-08-27 | 麦科威（昆山）机械有限公司 | Motor shaft supporting structure of plastic high-speed mixing machine |
| CN104158338A (en) * | 2014-08-18 | 2014-11-19 | 中达电机股份有限公司 | Explosion-suppression-type motor junction box structure |
| CN208062957U (en) * | 2018-03-14 | 2018-11-06 | 焦作市银星制动器有限公司 | A kind of double universal flameproof motors of pressure |
-
2020
- 2020-08-07 CN CN202010787618.2A patent/CN111953119B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714794A (en) * | 2009-08-18 | 2010-05-26 | 焦作市银星制动器有限公司 | Dual high voltage flameproof motor |
| CN104009579A (en) * | 2014-06-12 | 2014-08-27 | 麦科威（昆山）机械有限公司 | Motor shaft supporting structure of plastic high-speed mixing machine |
| CN104158338A (en) * | 2014-08-18 | 2014-11-19 | 中达电机股份有限公司 | Explosion-suppression-type motor junction box structure |
| CN208062957U (en) * | 2018-03-14 | 2018-11-06 | 焦作市银星制动器有限公司 | A kind of double universal flameproof motors of pressure |
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| CN111953119B (en) | 2023-03-24 |
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Denomination of invention: A special explosion-proof motor and process for plunger pumps Effective date of registration: 20230821 Granted publication date: 20230324 Pledgee: Weihai Commercial Bank Co.,Ltd. Yatou Sub branch Pledgor: Shandong Zhongtai explosion proof Motor Co.,Ltd. Registration number: Y2023980052872 |