Impeller overspeed device
By installing an underground cylinder and a multi-motor coordinated drive impeller overspeed device, the problems of eccentric vibration and poor heat dissipation in impeller overspeed tests were solved, thus improving safety and economy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINZHOU XINJINHUA MACHINERY MFG
- Filing Date
- 2025-07-25
- Publication Date
- 2026-04-21
AI Technical Summary
Existing overspeed devices have problems in impeller overspeed tests, such as impeller eccentric vibration leading to breakage and ejection, excessive torque on the motor, and poor heat dissipation.
An impeller overspeed device was designed, comprising a cylinder, a motor, planetary gears, and a gear cooling oil circuit. It utilizes underground installation and multi-motor collaborative drive to reduce motor specifications, and combines gears and main shaft cooling oil circuits to achieve multi-location cooling, thereby enhancing safety and heat dissipation.
It effectively prevents injuries from flying debris when the impeller breaks, reduces motor specifications and costs, and improves heat dissipation, ensuring safety and economy.
Smart Images
Figure CN224152019U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of overspeed testing technology, and more specifically, to an impeller overspeed device. Background Technology
[0002] Impellers are crucial components in various turbines. As high-speed rotating parts, their manufacturing process is extremely complex, with overspeed testing being an indispensable step that determines the safe operation of the equipment. Overspeed testing of impellers requires the use of an overspeed device, which is widely used in the turbine industry in my country.
[0003] The existing overspeed devices have the following problems: 1. During the overspeed test, if the impeller is not up to standard, it will cause eccentric vibration, which may lead to the impeller breaking and flying out, causing danger; 2. The motor used for the overspeed test needs to withstand too much torque, so the motor needs to be large and expensive; 3. Due to the heat generated by the rotation of the overspeed device, the existing structure is difficult to achieve heat dissipation at multiple points, resulting in poor heat dissipation effect. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an impeller overspeed device, which aims to solve the problems mentioned in the background art.
[0005] This utility model provides the following technical solution: an impeller overspeed device, comprising a cylinder, a motor fixed above the cylinder, an impeller to be tested rotatably connected inside the cylinder, the cylinder being installed underground, a top cover fixedly connected to the top of the cylinder, the top cover fixed above the ground, an upper housing fixed to the top of the upper cover, three identical motors arranged around the center of the upper housing fixedly on the upper housing, the output ends of the motors facing directly downwards and fixedly connected to planetary gears; a main shaft rotatably connected to the center of the upper cover, the main shaft penetrating and rotatably connected to the bottom of the upper housing. The main shaft has a sun gear fixed to its top, and the planetary gears mesh with the sun gear. An oil return chamber is provided between the top of the upper cover and the upper housing. Each planetary gear has an oil outlet facing the planetary gear via a gear cooling oil passage. The bottom of the upper housing is open, allowing the gear cooling oil passage to communicate with the oil return chamber. A main shaft cooling oil passage is provided inside the upper cover, supplying oil to the main shaft and communicating with the oil return chamber. The oil return chamber is connected to an external oil return tank via a return oil pipe. Both the main shaft cooling oil passage and the gear cooling oil passage are supplied with oil from an external oil inlet tank.
[0006] As a further preferred embodiment of this utility model, the top of the upper housing is provided with a smoke exhaust port for discharging high-temperature oil fumes.
[0007] As a further preferred embodiment of this utility model, a coupling is provided below the main shaft body, and the central shaft body of the impeller to be tested is connected through the coupling. A bracket is fixed inside the cylinder body, and the bottom of the central shaft body of the impeller to be tested is rotatably connected to the bracket, which facilitates the measurement of impellers with different inner diameters and improves the replacement efficiency.
[0008] As a further preferred embodiment of this utility model, the spindle cooling oil circuit includes a spindle oil supply circuit, a damper oil supply circuit, and a bottom return oil circuit. The spindle oil supply circuit supplies oil to the rotating connection between the spindle body and the upper cover. The oil outlet of the damper oil supply circuit is connected to the return oil chamber through the bottom return oil circuit. The damper oil supply circuit is located below the spindle oil supply circuit and is used to cool the spindle body at multiple locations.
[0009] As a further preferred embodiment of this utility model, an instrument line outlet is provided on one side of the lower part of the upper housing; a speed probe and a vibration probe are installed on the side wall of the main shaft, the vibration probe is located below the speed probe, and the connection between the speed probe and the vibration probe passes through the instrument line outlet and connects to the outer instrument, which is used to indirectly detect the rotation and vibration amplitude of the impeller under test by measuring the main shaft.
[0010] As a further preferred embodiment of this utility model, the gear cooling oil circuit includes a central oil spray port and an outer oil spray port; the motor is keyed to the planetary gears, and a cavity is provided at the connection point; the central oil spray port is located in the cavity directly below the center of the motor output end, and the central oil spray port penetrates the planetary gear shaft to spray oil into the inner side of the planetary gears; the end of the gear cooling oil circuit is provided with a vertically upward outer oil spray port, which sprays oil into the outer side of the planetary gears and the sun gear to achieve multi-position cooling of the gears.
[0011] As a further preferred embodiment of this utility model, the motor is connected to a frequency converter control cabinet, and multiple motors are started synchronously through the frequency converter control cabinet. The multiple motors are connected in parallel to reduce the speed difference, so that the speed difference is within 2 revolutions.
[0012] As a further preferred embodiment of this invention, the planetary gear surface is provided with a plurality of upper and lower through holes evenly distributed to reduce the inertia of the planetary gear.
[0013] The technical effects and advantages of this utility model are as follows:
[0014] 1. By placing the cylinder underground, the impeller is below ground level during overspeed testing. No matter what emergency occurs (including impeller breakage), no loose parts or fragments will fly out, thus ensuring personal safety.
[0015] 2. By using three motors as power sources to drive the main shaft to rotate in tandem, the impeller below is driven to achieve overspeed testing, which reduces the required motor specifications, saves space and reduces costs.
[0016] 3. By setting up gear cooling oil circuits and spindle cooling oil circuits, cooling is achieved at multiple locations, and the oil is recycled in a unified manner, which improves both the cooling effect and the recycling effect. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings.
[0018] Figure 1 This is a schematic diagram of the impeller overspeed device of this utility model, omitting the repeating motor.
[0019] Figure 2 for Figure 1 Enlarged view of point A.
[0020] Figure 3 for Figure 1 Enlarged view of point D.
[0021] Figure 4 This is a top view of the impeller overspeed device of this utility model.
[0022] Figure 5 for Figure 1 Sectional view at CC.
[0023] Figure 6 for Figure 1 Sectional view at BB.
[0024] The attached diagram is labeled as follows: 1. Motor; 2. Exhaust port; 3. Planetary gear; 4. Gear cooling oil circuit; 5. Oil return chamber; 6. Oil return pipe; 7. Main shaft; 8. Upper housing; 9. Instrument line outlet; 10. Top cover; 11. Coupling; 12. Impeller to be tested; 13. Cylinder; 14. Support; 15. Main shaft cooling oil circuit; 16. Oil inlet tank; 17. Oil return tank; 18. Damper oil supply circuit; 19. Main shaft oil supply circuit; 20. Speed probe; 21. Bottom oil return circuit; 22. Vibration probe; 401. Center oil spray port; 402. Outer oil spray port. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] See Figure 1-6 As shown, this utility model provides the following technical solution: an impeller overspeed device, including a cylinder 13, a motor 1 fixed above the cylinder 13, an impeller 12 to be tested rotatably connected inside the cylinder 13, the cylinder 13 being installed underground, a top cover 10 fixedly connected to the top of the cylinder 13, the top cover 10 being fixed above the ground, an upper housing 8 fixedly fixed to the top of the upper cover 10, and three identical motors 1 arranged around the center of the upper housing 8 fixedly on the upper housing 8, the output ends of the motors 1 facing directly downwards and fixedly connected to planetary gears 3, the planetary gears 3 having multiple upper and lower through holes evenly distributed on their surfaces to reduce the inertia of the planetary gears 3; a main shaft 7 rotatably connected to the center of the upper cover 10, and so on. The main spindle 7 passes through and is rotatably connected to the bottom of the upper housing 8. A sun gear is fixed to the top of the main spindle 7, and the planetary gears 3 mesh with the sun gear. An oil return chamber 5 is provided between the top of the upper cover 10 and the upper housing 8. Each of the planetary gears 3 is provided with a gear cooling oil passage 4 with an oil outlet facing the planetary gear 3. The bottom of the upper housing 8 is open, so that the gear cooling oil passage 4 is connected to the oil return chamber 5. A main spindle cooling oil passage 15 is provided inside the upper cover 10. The main spindle cooling oil passage 15 supplies oil to the main spindle and is connected to the oil return chamber 5. The oil return chamber 5 is connected to the external oil return tank 17 through the oil return pipe 6. The main spindle cooling oil passage 15 and the gear cooling oil passage 4 are supplied with oil from the external oil inlet tank 16.
[0027] like Figure 1 As shown in this embodiment of the present invention, the top of the upper housing 8 is provided with a smoke exhaust port 2 for exhausting high-temperature oil fumes. The filtration of the smoke exhaust port 2 is existing technology and will not be described in detail here.
[0028] like Figure 1 As shown in this embodiment of the utility model, a coupling 11 is provided below the main shaft 7, and the central shaft of the impeller 12 to be tested is connected through the coupling 11. A bracket 14 is fixed inside the cylinder 13, and the bottom of the central shaft of the impeller 12 to be tested is rotatably connected to the bracket 14, which facilitates the measurement of impellers 12 with different inner diameters and improves the replacement efficiency.
[0029] In the operation of this embodiment, by opening the upper cover 10, the impeller 12 to be tested is lifted out, the connection between the coupling 11 and the central shaft of the impeller 12 to be tested is disconnected, and a new impeller 12 to be tested and the central shaft are replaced, so as to realize the measurement of impellers 12 with different inner diameters.
[0030] like Figure 3As shown in the embodiment of this utility model, the spindle cooling oil circuit 15 includes a spindle oil supply circuit 19, a damper oil supply circuit 18, and a bottom return oil circuit 21. The spindle oil supply circuit 19 supplies oil to the rotatable connection between the spindle body 7 and the upper cover 10. The oil outlet of the damper oil supply circuit 18 is connected to the return oil chamber 5 through the bottom return oil circuit 21. The damper oil supply circuit 18 is located below the spindle oil supply circuit 19 and is used to cool the spindle body 7 at multiple locations.
[0031] like Figures 3-5 As shown in this embodiment of the present invention, an instrument line outlet 9 is provided on one side of the lower part of the upper housing 8; a speed probe 20 and a vibration probe 22 are installed on the side wall of the main shaft 7. The vibration probe 22 is located below the speed probe 20. The speed probe 20 and the vibration probe 22 are connected by a line passing through the instrument line outlet 9 and connected to an external instrument, which is used to indirectly detect the rotation and vibration amplitude of the impeller 12 under test by measuring the main shaft 7.
[0032] like Figure 2 , Figure 4 and Figure 6 As shown in the embodiment of this utility model, the gear cooling oil circuit 4 includes a central oil spray port 401 and an outer oil spray port 402; the motor 1 is keyed to the planetary gear 3, and a cavity is provided at the connection point; the central oil spray port 401 is located in the cavity directly below the center of the output end of the motor 1, and the central oil spray port 401 penetrates the shaft of the planetary gear 3 and sprays oil into the inner side of the planetary gear 3; the end of the gear cooling oil circuit 4 is provided with a vertically upward outer oil spray port 402, and the outer oil spray port 402 sprays oil into the outer side of the planetary gear 3 and the sun gear to achieve multi-position cooling of the gear.
[0033] In this embodiment of the utility model, multiple motors 1 are started synchronously by the frequency converter control cabinet, and the multiple motors 1 are connected in parallel so that the speed difference is within 2 revolutions.
[0034] In the operation of this embodiment, the frequency converter is a JK-630 / 10 frequency converter control cabinet produced by Nanyang Explosion-proof Special Equipment Co., Ltd. The frequency converter used inside is a three KUKA ES850L-04-037G / 045P-3 model frequency converter, which corresponds one-to-one with motor 1. Synchronization is performed by an AOSHTB-4C synchronous controller. The above control method is existing technology and the components are readily available, so it will not be described in detail here.
[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A kind of impeller overspeed device, including cylinder, motor is fixed on the cylinder, the impeller to be measured is rotationally connected in the inside of the cylinder, it is characterized in that: The cylinder is installed underground, and the top of the cylinder is fixedly connected to the top cover. The top cover is fixed above the ground, and the top cover is fixed with an upper housing. The upper housing is fixed with three motors of the same specification arranged around the center. The output end of the motor faces directly downward and is fixedly connected to planetary gears. The top cover is rotatably connected to a main shaft, which passes through and is rotatably connected to the bottom of the upper housing. A sun gear is fixed to the top of the main shaft, and the planet gears mesh with the sun gear. An oil return chamber is provided between the top of the upper cover and the upper housing; each of the planetary gears is provided with a gear cooling oil passage with an oil outlet facing the planetary gear; the bottom of the upper housing is open, so that the gear cooling oil passage is connected to the oil return chamber; a spindle cooling oil passage is provided inside the upper cover, which supplies oil to the spindle and is connected to the oil return chamber; the oil return chamber is connected to the external oil return tank through a return oil pipe; the spindle cooling oil passage and the gear cooling oil passage are supplied with oil from the external oil inlet tank.
2. A runner overspeed device according to claim 1, characterised in that: The top of the upper housing is provided with a smoke exhaust port.
3. A runner overspeed device according to claim 2, wherein: A coupling is provided below the main shaft, which connects to the central shaft of the impeller to be tested. A bracket is fixed inside the cylinder, and the bottom of the central shaft of the impeller to be tested is rotatably connected to the bracket.
4. A runner overspeed device according to claim 1, wherein: The spindle cooling oil circuit includes a spindle oil supply circuit, a damper oil supply circuit, and a bottom return oil circuit. The spindle oil supply circuit supplies oil to the rotating connection between the spindle body and the upper cover. The oil outlet of the damper oil supply circuit is connected to the return oil chamber through the bottom return oil circuit. The damper oil supply circuit is located below the spindle oil supply circuit.
5. A runner overspeed device according to claim 1 wherein: An instrument line outlet is provided on one side of the lower part of the upper housing; a speed probe and a vibration probe are installed on the side wall of the main shaft, with the vibration probe located below the speed probe, and the connection between the speed probe and the vibration probe passing through the instrument line outlet and connecting to the outer instrument.
6. A runner overspeed device according to claim 1 wherein: The gear cooling oil circuit includes a central oil spray port and an outer oil spray port; the motor is keyed to the planetary gears, and a cavity is provided at the connection point. The central oil spray port is located in the cavity directly below the center of the motor output end. The central oil spray port passes through the planetary gear shaft and sprays oil into the inner side of the planetary gears. The end of the gear cooling oil circuit is provided with a vertically upward outer oil spray port, which sprays oil into the outer side of the planetary gears and the sun gear.
7. A runner overspeed device according to claim 1 wherein: The motor is connected to the frequency converter control cabinet, and multiple motors are started synchronously through the frequency converter control cabinet, with the multiple motors connected in parallel.
8. A runner overspeed device according to claim 1 wherein: The planetary gear surface is evenly provided with multiple upper and lower through holes.