Diesel generator set based on intelligent control

Abstract

The application discloses a diesel generating set based on intelligent control, a first shaft hole is longitudinally arranged through a generator base; a shaft coupling is rotatably arranged on the upper end of the generator base, an end cover is arranged on the lower end of the shaft base, a closed cavity is arranged in the end cover and communicates with the space at the bottom of the first shaft hole, an opening is arranged on the side wall of the end cover and communicates with the closed cavity, a circular metal pipeline is arranged outside the opening, a circular through hole is longitudinally arranged through the circular metal pipeline, the circular through hole communicates with the closed cavity, a plurality of steel balls are slidably arranged in the circular through hole, a reading head is fixedly arranged on the outer periphery of the circular metal pipeline, the reading head is connected with a monitoring device, and the steel balls relatively move in the inner side of the reading head. The application detects the change of the closed volume caused by the rotor movement through the linear ball grid ruler, thereby effectively monitoring the axial movement of the rotor in real time, and further faults caused by the rotor movement are avoided. The application solves the technical problem that the rotor movement in the generator is not easy to monitor.

Description

Technical Field

[0001] This invention relates to the field of generator set technology, and more specifically to a diesel generator set based on intelligent control. Background Technology

[0002] A diesel generator set consists of a diesel engine, a generator, a coupling, and a control device. The diesel engine drives the generator to produce electricity, which is then output to the outside. The diesel engine's vibration is relatively large, which can affect the generator's rotation and cause malfunctions. These malfunctions include generator instability, abnormal vibration and noise, changes in operating speed and output power, and abnormalities in the temperature, pressure, and flow rate of the medium.

[0003] Especially in high-speed rotating units, to improve efficiency, the rotor is usually fixed axially beforehand. However, with the increase of rotor speed, changes in rotor shaft temperature leading to volume changes, and the continuous operation and vibration of the diesel engine, the generator rotor can become loose in the axial direction. Over time, the axial movement of the rotor gradually increases, causing an increase in the vibration of the entire generator, leading to unstable operation. In mild cases, this can cause frictional damage to the seals; in severe cases, frictional collisions between the rotor and the stator or outer peripheral components can lead to major accidents. Therefore, it is essential to understand the fault characteristics of rotor movement in order to make timely diagnoses and prevent major accidents. Summary of the Invention

[0004] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0005] The purpose of this invention is to provide a diesel generator set based on intelligent control, which uses a linear ball grid ruler to detect changes in the sealed volume caused by rotor axial movement, thereby effectively monitoring the axial movement of the rotor in real time and avoiding further failures caused by rotor axial movement. This invention solves the technical problem of the difficulty in monitoring the rotor axial movement in diesel generator sets.

[0006] To achieve these and other advantages according to the present invention, a diesel generator set based on intelligent control is provided, comprising:

[0007] The generator base has a first shaft hole extending longitudinally through it;

[0008] A coupling is rotatably mounted on the upper end of the generator base via a rotating shaft, the rotating shaft rotatably passing through the first shaft hole, the axial position of the rotating shaft in the first shaft hole is fixed, and at least one axial side of the rotating shaft is sealed with the inner peripheral wall of the first shaft hole;

[0009] An end cap, which covers the lower end of the generator base, is sealed to the bottom of the generator base. The end cap has a sealed cavity communicating with the bottom space of the first shaft hole. An opening communicating with the sealed cavity is formed on the side wall of the end cap. A second shaft hole is formed through the center of the bottom of the end cap. The rotating shaft extends outward from the second shaft hole, and is sealed to the inner peripheral wall of the second shaft hole.

[0010] A circular metal pipe is externally connected to the opening. A circular through hole is axially opened through the central part of the circular metal pipe. The circular through hole communicates with the sealed cavity. Several steel balls are slidably disposed in the circular through hole. The diameter of the steel balls is the same as the diameter of the circular through hole. All the steel balls are connected together. A reading head is fixedly sleeved on the outer periphery of the circular metal pipe. The reading head is connected to the monitoring device. The steel balls move relative to the inner side of the reading head.

[0011] Preferably, a first circular step is formed on the generator base at the top of the first shaft hole, the diameter of the first circular step is larger than the diameter of the first shaft hole, and a plurality of first screw holes are formed at the bottom of the first circular step; a second circular step is formed on the inner peripheral wall of the first shaft hole at the lower end of the first circular step, and the diameter of the second circular step is between the diameter of the first shaft hole and the diameter of the first circular step.

[0012] Preferably, the top of the rotating shaft is connected to the center of the top of the generator base. A first circular limiting protrusion is provided on the upper outer periphery of the rotating shaft. The diameter of the first circular limiting protrusion is larger than the diameter of the rotating shaft. The first circular limiting protrusion is spaced apart at the upper end of the second circular step. A first bearing is provided on the upper outer periphery of the rotating shaft. The first bearing is limited between the first circular limiting protrusion and the second circular step. A first positioning block is installed on the first circular step by bolts. The bottom of the first positioning block extends and abuts against the top outer periphery of the first bearing.

[0013] Preferably, the outer periphery of the first bearing is fitted to the inner peripheral wall of the second circular step, the inner periphery of the first bearing is fitted to the side wall of the rotating shaft, and the inner and outer peripheries of the first bearing are sealed with grease to the corresponding contact surfaces.

[0014] Preferably, a third circular step is formed on the generator base at the bottom of the first shaft hole, the diameter of the third circular step being larger than the diameter of the first shaft hole, and a plurality of second screw holes are formed at the bottom of the generator base;

[0015] A second circular limiting protrusion is provided on the lower outer periphery of the rotating shaft. The diameter of the second circular limiting protrusion is larger than the diameter of the rotating shaft. The second circular limiting protrusion is spaced apart at the lower end of the third circular step. A second bearing is provided on the lower outer periphery of the rotating shaft. The second bearing is limited between the second circular limiting protrusion and the third circular step. A second positioning block is installed on the bottom of the generator base by bolts. The top of the second positioning block extends and abuts against the bottom outer periphery of the second bearing.

[0016] Preferably, the outer periphery of the second bearing is fitted to the inner peripheral wall of the third circular step, the inner periphery of the second bearing is fitted to the side wall of the rotating shaft, and the inner and outer peripheries of the second bearing are sealed with grease to the corresponding contact surfaces.

[0017] Preferably, a mounting portion is provided on the outer periphery of the top of the end cap, and the mounting portion is fixed to the bottom of the second positioning block by bolts. A sealing gasket is provided at the upper and lower ends of the second positioning block.

[0018] Preferably, the second shaft hole extends a certain distance to the bottom, and an extension shaft is provided at the bottom of the rotating shaft. The diameter of the extension shaft is smaller than the diameter of the rotating shaft. The extension shaft passes through the second shaft hole and extends outward. A mating seat is provided at the bottom of the extension shaft. The extension shaft is fitted to the inner peripheral wall of the second shaft hole, and the contact surface between the extension shaft and the inner peripheral wall of the second shaft hole is sealed with grease.

[0019] Preferably, the sealed cavity is connected to the bottom space of the first shaft hole to form a sealed accommodating cavity. The cross-sectional diameter of the accommodating cavity is not less than 10 times the longitudinal cross-sectional diameter of the circular through hole. The inner diameter of the sealed cavity is equivalent to the inner diameter of the first shaft hole. The depth of the sealed cavity is between one-tenth and one-third of the axial length of the first shaft hole.

[0020] Preferably, the circular metal pipe is horizontally arranged, a lubricant is provided on the inner wall of the circular through hole, the outer periphery of the longitudinal section of the steel ball moves in contact with the inner wall of the circular through hole, and limit blocks are provided on the inner walls at both ends of the circular through hole.

[0021] Compared with the prior art, the beneficial effects of this invention are as follows:

[0022] 1. The amount of rotor movement of a generator can be accurately detected using a linear ball scale, with a measurement accuracy down to the micrometer level;

[0023] 2. The volume change caused by the axial movement of the rotor is magnified by measuring the volume scaling, and the axial displacement of the rotor is measured by measuring the linear displacement after the volume change stroke is magnified, which further improves the measurement accuracy of the rotor axial displacement.

[0024] 3. By remotely monitoring the rotor axial movement, timely warnings are issued to avoid malfunctions caused by rotor movement, thus improving the reliability of generator stable operation.

[0025] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the bottom structure of the generator;

[0028] Figure 3 This is a longitudinal sectional view of the device of the present invention;

[0029] Figure 4 This is a sectional view of the generator base;

[0030] Figure 5 This is a sectional view of the end cap. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0032] like Figure 1-5 As shown, the present invention provides a diesel generator set based on intelligent control. A first shaft hole 210 is longitudinally opened through the generator base 200. The generator base 200 is fixed on the ground. A coupling 100 is rotatably mounted on the upper end of the generator base 200 through a rotating shaft 500. The generator shaft is connected to the output end of the diesel engine through the coupling 100. The diesel engine drives the generator to rotate. The rotating shaft 500 rotatably passes through the first shaft hole 210. The top of the rotating shaft 500 is connected to the center of the top of the generator base 200.

[0033] Initially, the axial position of the rotating shaft 500 in the first shaft hole 210 is fixed, effectively preventing axial movement. However, as the rotational speed of the rotating shaft 500 increases, the volume changes caused by the temperature change of the rotating shaft 500, and the continuous operation and vibration of the entire unit, the rotating shaft 500 may become loose in the axial direction. Over time, the rotating shaft 500 may also move in the axial direction, and the amount of movement gradually increases. Therefore, the present invention mainly focuses on effectively monitoring and diagnosing this amount of axial movement to avoid the occurrence of faults in a timely manner.

[0034] The rotating shaft 500 is sealed to the inner peripheral wall of the first shaft hole 210, thereby forming a closed space inside the first shaft hole 210. Specifically, a first circular step 221 is formed on the generator base 200 at the top of the first shaft hole 210. The diameter of the first circular step 221 is larger than the diameter of the first shaft hole 210. A plurality of first screw holes 222 are formed at the bottom of the first circular step 221. At the same time, a second circular step 231 is formed on the inner peripheral wall of the first shaft hole 210 at the lower end of the first circular step 221. The diameter of the second circular step 231 is between the diameter of the first shaft hole 210 and the diameter of the first circular step 221.

[0035] A first circular limiting protrusion 530 is provided on the upper outer periphery of the rotating shaft 500. The first circular limiting protrusion 530 is located at the axial position corresponding to the second circular step 231. The diameter of the first circular limiting protrusion 530 is larger than the diameter of the rotating shaft 500. The bottom of the first circular limiting protrusion 530 is spaced apart at the upper end of the bottom of the second circular step 231. A first bearing 610 is provided on the upper outer periphery of the rotating shaft 500. The first bearing 610 is a sealed bearing to prevent the first shaft hole from communicating with the outside through the first bearing. The first bearing 610 is limited between the first circular limiting protrusion 530 and the second circular step 231. At the same time, in order to prevent the first bearing 610 from shaking during operation, a first positioning block 350 is installed on the first circular step 221 by bolts. The bolts pass through the first positioning block 350 and are fixed in the first screw hole 222.

[0036] The first positioning block 350 is an annular structure corresponding to the first circular step 221. The outer diameter of the first positioning block 350 is the same as the outer diameter of the first circular step 221, and the inner diameter of the first positioning block 350 is the same as the inner diameter of the first shaft hole 210. The bottom of the inner circumference of the first positioning block 350 extends downward and abuts against the outer circumference of the top of the first bearing 610, thereby fixing the first bearing 610 between the first circular limiting protrusion 530 and the second circular step 231.

[0037] The outer periphery of the first bearing 610 is fitted to the inner peripheral wall of the second circular step 231, and the inner periphery of the first bearing 610 is fitted to the side wall of the rotating shaft 500. Furthermore, the inner and outer peripheries of the first bearing 610 are sealed with the corresponding contact surfaces by grease, thereby sealing the upper part of the rotating shaft 500 with the inner peripheral wall of the first shaft hole 210 at the location through the first bearing 610.

[0038] Similarly, a third circular step 232 is provided on the generator base 200 at the bottom of the first shaft hole 210. The diameter of the third circular step 232 is larger than the diameter of the first shaft hole 210. A plurality of second screw holes 240 are provided at the bottom of the generator base 200.

[0039] A second circular limiting protrusion 540 is provided on the lower outer periphery of the rotating shaft 500. The diameter of the second circular limiting protrusion 540 is larger than the diameter of the rotating shaft 500. The second circular limiting protrusion 540 is spaced apart at the lower end of the third circular step 232. A second bearing 620 is provided on the lower outer periphery of the rotating shaft 500. The second bearing 620 is also a sealed bearing. The second bearing 620 is limited between the second circular limiting protrusion 540 and the third circular step 232. At the same time, in order to prevent the second bearing 620 from shaking during operation, a second positioning block 300 is installed at the bottom of the generator base 200 by bolts. The bolts pass through the second positioning block 300 and are fixed in the second screw hole 240, thus fixing the second positioning block 300 to the bottom of the generator base 200.

[0040] The second circular step 231 and the third circular step 232 are vertically correspondingly arranged, and the first positioning block 350 and the second positioning block 300 are vertically correspondingly arranged. Specifically, the second positioning block 300 is an annular structure corresponding to the bottom of the generator base 200, and the inner diameter of the second positioning block 300 is the same as the inner diameter of the first shaft hole 210. The top of the inner circumference of the first positioning block 350 extends upward and abuts against the outer circumference of the bottom of the second bearing 620, thereby fixing the second bearing 620 between the second circular limiting protrusion 540 and the third circular step 232.

[0041] The outer periphery of the second bearing 620 is fitted to the inner peripheral wall of the third circular step 232, and the inner periphery of the second bearing 620 is fitted to the side wall of the rotating shaft 500. Furthermore, the inner and outer peripheries of the second bearing 620 are sealed with grease to the corresponding contact surfaces, thereby sealing the upper part of the rotating shaft 500 with the inner peripheral wall of the first shaft hole 210 at the location through the second bearing 620.

[0042] An end cap 400 is fitted over the lower end of the generator base, thereby sealing the end cap 400 to the bottom of the generator base. The end cap 400 has a sealed cavity 421 that communicates with the bottom space of the first shaft hole 210. An opening 440 communicating with the sealed cavity 421 is opened on the side wall of the end cap 400. A second shaft hole 431 is opened through the center of the bottom of the end cap 400. The rotating shaft 500 is led outward from the second shaft hole 431. The rotating shaft 500 is sealed with the inner peripheral wall of the second shaft hole 431.

[0043] Specifically, a mounting portion 410 is provided protruding from the outer periphery of the top of the end cover 400. The distribution diameter of the mounting portion 410 is the same as the distribution diameter of the second positioning block 300. A screw hole 411 is also provided through the mounting portion 410. The mounting portion 410 is fixed to the bottom of the second positioning block 300 by bolts. The bolts pass through the screw holes on the mounting portion 410 and the second positioning block 300 in sequence and are fixed in the second screw hole 240, so that the end cover 400 and the second positioning block 300 are fixed to the bottom of the generator base 200 in sequence.

[0044] Meanwhile, a sealing gasket 310 is provided at both the upper and lower ends of the second positioning block 300 to seal the contact surfaces of the upper and lower surfaces of the second positioning block 300.

[0045] The bottom of the mounting part 410 extends downward to form a first cavity wall 420. The inner space of the first cavity wall 420 is a sealed cavity 421. The sealed cavity 421 is a cylindrical cavity. The inner diameter of the cavity is equivalent to the inner diameter of the first shaft hole 210, and the depth of the cavity is one-fifth of the axial length of the first shaft hole 210. An opening 440 is laterally opened on the first cavity wall 420 and penetrates the first cavity wall 420 to communicate with the sealed cavity 421.

[0046] A second cavity wall 430 extends downward from the bottom center of the sealed cavity 421. The second shaft hole 431 is formed inside the second cavity wall 430. The inner diameter of the second shaft hole 431 is smaller than the inner diameter of the first shaft hole 210. Correspondingly, an extension shaft 510 extends from the bottom of the rotating shaft 500. The diameter of the extension shaft 510 is smaller than the diameter of the rotating shaft 500. The extension shaft 510 passes through the second shaft hole 431 and extends outward. A mating seat 520 is provided at the bottom of the extension shaft 510, which can be used to connect with other generator couplings to realize that one diesel engine can drive multiple generators to generate electricity together.

[0047] In order to seal the bottom of the end cap 400, the extended shaft 510 is fitted to the inner peripheral wall of the second shaft hole 431, and the contact surface between the extended shaft 510 and the inner peripheral wall of the second shaft hole 431 is sealed with grease, thereby sealing the extended shaft 510 with the inner peripheral wall of the second shaft hole 431 at its location.

[0048] Since the first shaft hole 210 is sealed to the rotating shaft 500 by the first bearing 610 and the second bearing 620 in sequence, and the outer shaft 510 is sealed to the inner peripheral wall of the second shaft hole 431 at the same position, and the end cover 400 seals the bottom of the first shaft hole 210, the sealed cavity 421 is sealed.

[0049] The upper part of the sealed cavity 421 is sealed by two sealing mechanisms, namely the first bearing 610 and the second bearing 620, which enhances the sealing performance of the top of the sealed cavity 421. At the same time, the second shaft hole 431 extends downward by a certain distance, which increases the contact distance and contact area between the extended shaft 510 and the second shaft hole 431 at the location. The sealing performance is further enhanced by grease on the contact surface, which ultimately strengthens the sealing performance of the bottom of the sealed cavity 421.

[0050] Although the axial position of the shaft 500 is initially fixed, with the increase of the shaft 500's rotational speed, the volume change caused by temperature variations, and the continuous operation and vibration of the entire unit, especially the continuous vibration of the generator driven by the diesel engine, the shaft 500 will become loose in the axial direction. Over time, the shaft 500 will also exhibit axial movement, and the amount of movement gradually increases. As the shaft 500 moves axially, due to the sealed configuration of the sealed cavity 421, the volume and air pressure within the sealed cavity 421 will change accordingly. Specifically, if the shaft 500 moves upward, the volume of the sealed cavity 421 increases and the air pressure decreases; if the shaft 500 moves downward, the volume of the sealed cavity 421 decreases and the air pressure increases, and the changes in volume and air pressure are directly proportional to the amount of axial movement of the shaft 500. Therefore, monitoring the changes in volume and air pressure within the sealed cavity 421 allows for the measurement of the axial movement of the shaft 500.

[0051] In order to accurately measure the change in volume within the sealed cavity 421, the present invention provides the following technical solution:

[0052] A circular metal pipe 710 is externally connected to the opening 440, and the circular metal pipe 710 is horizontally arranged. A circular through hole is axially opened through the circular metal pipe 710. The circular through hole communicates with the sealed cavity 421 through the opening 440. Several steel balls 720 are slidably arranged in the circular through hole. The diameter of the steel balls 720 is the same as the diameter of the circular through hole, and the steel balls 720 are connected together, so that the steel balls 720 slide synchronously in the circular through hole. A lubricant is provided on the inner wall of the circular through hole to increase the lubricity of the contact surface between the steel balls 720 and the inner wall of the circular through hole, so as to facilitate the movement of the steel balls 720 in the circular through hole, reduce the movement resistance, and at the same time increase the sealing performance between the steel balls 720 and the inner wall of the circular through hole. That is, the steel balls 720 effectively seal the outlet of the circular through hole, preventing gas leakage at the contact surface between the steel balls 720 and the inner wall of the circular through hole, which would affect the airtightness of the sealed cavity 421.

[0053] When the axial movement of the rotating shaft 500 causes a change in the volume of the sealed cavity 421, the steel ball 720 can be driven to move left and right within the circular through hole to offset the overall volume change within the sealed cavity 421. In other words, the volume change caused by the movement of the steel ball 720 is consistent with the volume change within the sealed cavity 421 caused by the axial movement of the rotating shaft 500. Since the inner diameter of the circular through hole is fixed and known, the axial movement of the rotating shaft 500 can be monitored by monitoring the displacement of the steel ball 720.

[0054] To accurately measure the displacement of the steel ball 720, a reading head 730 is fixedly fitted around the outer periphery of the circular metal pipe 710. The circular metal pipe 710, the steel ball 720, and the reading head 730 form a straight ball grid displacement measurement system. The straight ball grid is used to accurately detect the rotor movement, and the measurement accuracy can reach the micrometer level. As the rotating shaft 500 moves axially, the steel ball 720 is driven to move relative to the inside of the reading head 730, generating relative displacement. The reading head 730 is connected to a monitoring device to monitor the displacement of the steel ball 720 in real time, and finally completes the real-time accurate measurement of the axial movement of the rotating shaft 500.

[0055] In the above technical solution, in order to improve the measurement accuracy of the axial movement of the rotating shaft 500, the present invention designs the inner diameter ratio of the circular through hole. Specifically, the sealed cavity 421 is connected to the bottom space of the first shaft hole 210 to form a sealed accommodating cavity. The cross-sectional diameter of the accommodating cavity is not less than 10 times the longitudinal cross-sectional diameter of the circular through hole. That is, when the axial movement of the rotating shaft 500 causes a change in the volume inside the sealed cavity 421, the displacement of the steel ball 720 in the circular through hole is 100 times the axial displacement of the rotating shaft 500. This effectively amplifies the axial displacement of the rotating shaft 500 for accurate measurement and monitoring, timely warning, and prevention of malfunctions.

[0056] Meanwhile, the outer periphery of the longitudinal section of the steel ball 720 moves in contact with the inner wall of the circular through hole. To prevent the steel ball 720 from overtraveling, limit stops 711 are provided protruding on the inner walls at both ends of the circular through hole.

[0057] As described above, this invention uses a linear ball scale to accurately detect rotor axial movement, achieving a measurement accuracy down to the micrometer level. Simultaneously, by scaling the measurement volume, the volume change caused by rotor axial movement is amplified, and the rotor axial displacement is measured by measuring the displacement after the volume change is amplified, further improving the measurement accuracy of rotor axial displacement. Furthermore, by remotely monitoring rotor axial movement and providing timely warnings, faults caused by rotor axial movement are avoided, improving the reliability of the entire unit's stable operation.

[0058] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A diesel generator set based on intelligent control, characterized in that, include: The generator base has a first shaft hole extending longitudinally through it; A coupling is rotatably mounted on the upper end of the generator base via a rotating shaft, the rotating shaft rotatably passing through the first shaft hole, the axial position of the rotating shaft in the first shaft hole is fixed, and at least one axial side of the rotating shaft is sealed with the inner peripheral wall of the first shaft hole; An end cap, which covers the lower end of the generator base, is sealed to the bottom of the generator base. The end cap has a sealed cavity communicating with the bottom space of the first shaft hole. An opening communicating with the sealed cavity is formed on the side wall of the end cap. A second shaft hole is formed through the center of the bottom of the end cap. The rotating shaft extends outward from the second shaft hole, and is sealed to the inner peripheral wall of the second shaft hole. A circular metal pipe is externally connected to the opening. A circular through hole is axially opened through the central part of the circular metal pipe. The circular through hole communicates with the sealed cavity. Several steel balls are slidably disposed in the circular through hole. The diameter of the steel balls is the same as the diameter of the circular through hole. All the steel balls are connected together. A reading head is fixedly sleeved on the outer periphery of the circular metal pipe. The reading head is connected to the monitoring device. The steel balls move relative to the inner side of the reading head.

2. The diesel generator set based on intelligent control as described in claim 1, characterized in that, A first circular step is formed on the generator base at the top of the first shaft hole. The diameter of the first circular step is larger than the diameter of the first shaft hole. A plurality of first screw holes are formed at the bottom of the first circular step. A second circular step is formed on the inner peripheral wall of the first shaft hole at the lower end of the first circular step. The diameter of the second circular step is between the diameter of the first shaft hole and the diameter of the first circular step.

3. The diesel generator set based on intelligent control as described in claim 2, characterized in that, The top of the rotating shaft is connected to the center of the top of the generator base. A first circular limiting protrusion is provided on the upper outer periphery of the rotating shaft. The diameter of the first circular limiting protrusion is larger than the diameter of the rotating shaft. The first circular limiting protrusion is spaced apart at the upper end of the second circular step. A first bearing is provided on the upper outer periphery of the rotating shaft. The first bearing is limited between the first circular limiting protrusion and the second circular step. A first positioning block is installed on the first circular step by bolts. The bottom of the first positioning block extends and abuts against the top outer periphery of the first bearing.

4. The diesel generator set based on intelligent control as described in claim 3, characterized in that, The outer circumference of the first bearing is fitted to the inner circumference of the second circular step, and the inner circumference of the first bearing is fitted to the side wall of the rotating shaft. The inner and outer circumferences of the first bearing are sealed with grease to the corresponding contact surfaces.

5. The diesel generator set based on intelligent control as described in claim 4, characterized in that, A third circular step is provided on the generator base at the bottom of the first shaft hole. The diameter of the third circular step is larger than the diameter of the first shaft hole. A plurality of second screw holes are provided at the bottom of the generator base. A second circular limiting protrusion is provided on the lower outer periphery of the rotating shaft. The diameter of the second circular limiting protrusion is larger than the diameter of the rotating shaft. The second circular limiting protrusion is spaced apart at the lower end of the third circular step. A second bearing is provided on the lower outer periphery of the rotating shaft. The second bearing is limited between the second circular limiting protrusion and the third circular step. A second positioning block is installed on the bottom of the generator base by bolts. The top of the second positioning block extends and abuts against the bottom outer periphery of the second bearing.

6. The diesel generator set based on intelligent control as described in claim 5, characterized in that, The outer circumference of the second bearing is fitted to the inner circumferential wall of the third circular step, and the inner circumference of the second bearing is fitted to the side wall of the rotating shaft. The inner and outer circumferences of the second bearing are sealed with grease to the corresponding contact surfaces.

7. The diesel generator set based on intelligent control as described in claim 6, characterized in that, A mounting part protrudes from the outer periphery of the top of the end cap. The mounting part is fixed to the bottom of the second positioning block by bolts. A sealing gasket is provided at the upper and lower ends of the second positioning block.

8. The diesel generator set based on intelligent control as described in claim 7, characterized in that, The second shaft hole extends a certain distance to the bottom, and an extension shaft is provided at the bottom of the rotating shaft. The diameter of the extension shaft is smaller than the diameter of the rotating shaft. The extension shaft passes through the second shaft hole and extends outward. A mating seat is provided at the bottom of the extension shaft. The extension shaft is fitted to the inner peripheral wall of the second shaft hole, and the contact surface between the extension shaft and the inner peripheral wall of the second shaft hole is sealed with grease.

9. The diesel generator set based on intelligent control as described in claim 8, characterized in that, The sealed cavity is connected to the bottom space of the first shaft hole to form a sealed accommodating cavity. The cross-sectional diameter of the accommodating cavity is not less than 10 times the longitudinal cross-sectional diameter of the circular through hole. The inner diameter of the sealed cavity is equivalent to the inner diameter of the first shaft hole. The depth of the sealed cavity is between one-tenth and one-third of the axial length of the first shaft hole.

10. The diesel generator set based on intelligent control as described in claim 9, characterized in that, The circular metal pipe is horizontally arranged, and a lubricant is provided on the inner wall of the circular through hole. The outer periphery of the longitudinal section of the steel ball moves in contact with the inner wall of the circular through hole, and limit blocks are provided on the inner walls at both ends of the circular through hole.

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