Centrifugal pump impeller locking device
By setting a locking device on the centrifugal pump impeller and locking the lock nut with the pin and spring, the loosening problem of the impeller during high-speed operation is solved, and stable connection and cost optimization are achieved.
Patent Information
- Application Number
- CN202422178350.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The impeller of the existing centrifugal pump is prone to loosening of the nut due to vibration during high-speed operation. In the prior art, the fastening methods of multiple sets of nuts increase the length and cost of the threaded end of the pump shaft.
The locking device is adopted, including a pin, a spring and a locking nut. The locking nut is locked through the pin insertion into the socket of the fixing ring to prevent it from rotating and loosening, and prevent the impeller plate from rotating on the pump shaft through the plug block and plug groove.
Effectively prevent the impeller plate from loosening during high-speed operation, simplifying the nut fastening structure, reducing costs and improving stability.
Smart Images
Figure CN223152352U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of centrifugal pump impeller fastening, and specifically refers to a centrifugal pump impeller anti-loosening device. Background Art
[0002] The impeller of a centrifugal pump is usually directly connected to the pump shaft by one or more nuts. In order to improve the tightness between the impeller and the pump shaft, a common practice is to add gaskets and then use multiple groups of nuts for fastening. However, with the high-speed operation and vibration of the centrifugal pump, the nuts are still prone to loosening. Moreover, when using multiple groups of nuts for pressing, the threaded end of the pump shaft needs to extend longer, resulting in more cost investment. Therefore, improvements are needed. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is that when the impeller of a centrifugal pump in the prior art operates at high speed, the nuts are prone to loosening due to vibration.
[0004] In order to achieve the above functions, the technical solution adopted by the utility model is as follows: a centrifugal pump impeller anti-loosening device, including a pump shaft, a baffle is fixedly connected to the pump shaft, a threaded head is provided at the end of the pump shaft, an impeller plate is sleeved on the pump shaft, a fixing ring is fixedly connected to the impeller plate, insertion holes are circumferentially and arrayed in the fixing ring, a locking nut is threadedly connected to the threaded head, and a locking device is arranged in the locking nut; the locking device includes a pin shaft, an end cover is fixedly connected to the end of the pin shaft, a spring is sleeved on the pin shaft, one end of the spring is fixedly connected to the end cover and the other end is fixedly connected to the locking nut. When the locking nut presses the impeller plate against the baffle, the pin shaft is inserted into the insertion hole to lock the locking nut, which can prevent the locking nut from rotating and loosening, achieving the purpose of preventing the impeller plate from loosening.
[0005] Preferably, insertion blocks are circumferentially and arrayed on the back side of the impeller plate, and insertion grooves are embedded on the side of the baffle facing the impeller plate and correspond to the insertion blocks one by one. By inserting the insertion blocks into the insertion grooves, the impeller plate can be prevented from rotating on the pump shaft.
[0006] Preferably, the initial state of the spring can ensure that the pin shaft passes through the locking nut. When the locking nut is screwed, the end cover can be lifted by means of a collar, so that the pin shaft retracts into the locking nut, facilitating the screwing of the locking nut.
[0007] Preferably, when the impeller plate is blocked by the baffle, the length of the threaded head exposed is equal to the thickness of the locking nut.
[0008] Preferably, two groups of the locking devices are symmetrically arranged on the locking nut.
[0009] Preferably, the number of the insertion holes circumferentially arrayed in the fixing ring is an even number.
[0010] The beneficial effects achieved by the present utility model with the above structure are as follows:
[0011] 1. By setting a locking device, after the locking nut is tightened, when the end cover is loosened, under the pulling force of the spring, the pin shaft can be inserted into the jack in the fixing ring, so as to lock the locking nut and achieve the purpose of preventing loosening.
[0012] 2. By setting a plugging block and a plugging groove, when installing the impeller plate, the plugging block can be inserted into the corresponding plugging groove, which can prevent the impeller plate from rotating on the pump shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is the overall exploded view of an anti-loosening device for the impeller of a centrifugal pump according to the present utility model;
[0014] Figure 2 is the structural diagram of the locking device of an anti-loosening device for the impeller of a centrifugal pump according to the present utility model;
[0015] Figure 3 is the back view of the impeller plate;
[0016] Figure 4 is the distribution diagram of the baffles on the pump shaft.
[0017] Among them, 1. pump shaft, 2. baffle, 3. thread head, 4. impeller plate, 5. fixing ring, 6. jack, 7. locking nut, 8. locking device, 9. pin shaft, 10. end cover, 11. spring, 12. plugging block, 13. plugging groove. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0020] Such as Figures 1-4, A centrifugal pump impeller anti-loosening device of the present utility model includes a pump shaft 1, a baffle 2 is fixedly connected to the pump shaft 1, a thread head 3 is provided at the end of the pump shaft 1, and the length of the thread head 3 exposed when the impeller plate 4 is blocked by the baffle 2 is equal to the thickness of the locking nut 7. An impeller plate 4 is sleeved on the pump shaft 1, a fixing ring 5 is fixedly connected to the impeller plate 4, a plurality of insertion holes 6 are circumferentially and arrayed in the fixing ring 5, and the number of the insertion holes 6 circumferentially arrayed in the fixing ring 5 is even. A locking nut 7 is threadedly connected to the thread head 3, and a locking device 8 is provided in the locking nut 7, and two groups of the locking devices 8 are symmetrically arranged on the locking nut 7.
[0021] As Figures 1-2 , the locking device 8 includes a pin shaft 9, an end cover 10 is fixedly connected to the end of the pin shaft 9, a spring 11 is sleeved on the pin shaft 9, one end of the spring 11 is fixedly connected to the end cover 10 and the other end is fixedly connected to the locking nut 7. The initial state of the spring 11 can satisfy that the pin shaft 9 passes through the locking nut 7. When the locking nut 7 is rotated, the end cover 10 can be jacked up by means of a collar, so that the pin shaft 9 retracts into the locking nut 7, which is convenient for rotating the locking nut 7. When the locking nut 7 presses the impeller plate 4 against the baffle 2, the pin shaft 9 is inserted into the insertion hole 6 to lock the locking nut 7, and the rotation and loosening of the locking nut 7 can be avoided, so as to achieve the purpose of preventing the impeller plate 4 from loosening.
[0022] As Figures 3-4 , a plurality of insertion blocks 12 are circumferentially arrayed on the back side of the impeller plate 4, and a plurality of insertion grooves 13 corresponding to the insertion blocks 12 are embedded on the side of the baffle 2 facing the impeller plate 4. By inserting the insertion blocks 12 into the insertion grooves 13, the rotation of the impeller plate 4 on the pump shaft 1 can be avoided.
[0023] During specific use, when installing the impeller plate 4, first, the impeller plate 4 of the centrifugal pump is sleeved on the pump shaft 1 from one end of the thread head 3, so that the insertion blocks 12 are aligned and inserted into the insertion grooves 13. The insertion grooves 13 can limit the rotation of the impeller plate 4 on the pump shaft 1. Then, the end cover 10 is pulled, and a tool is used to support the end cover 10, such as a semi-circular collar, which is supported between the end cover 10 and the locking nut 7, so that the pin shaft 9 retracts into the locking nut 7.
[0024] The locking nut 7 is screwed onto the thread head 3 until the locking nut 7 presses and fixes the impeller plate 4. Then, the collar between the end cover 10 and the locking nut 7 is taken out. Under the pulling force of the spring 11, the pin shaft 9 will be inserted into the insertion hole 6. There are two groups of the pin shafts 9 symmetrically arranged, and the insertion holes 6 on the fixing ring 5 are arrayed in an even number. Therefore, when one group of the pin shafts 9 is inserted into the insertion hole 6, the other group of the pin shafts 9 can also be inserted into the insertion hole 6, and the impeller plate 4 can be firmly locked. When the impeller plate 4 rotates synchronously with the pump shaft 1, even if it is vibrated, since the spring 11 has an elastic force on the pin shaft 9 and is always inserted into the insertion hole 6, the impeller plate 4 will not loosen.
[0025] The above description has been made on the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design, without creative work, structural manners and embodiments similar to the technical solution without departing from the purpose of the creation of the present utility model, they shall fall within the protection scope of the present utility model.
Claims
1. A centrifugal pump impeller anti-loosening device, including a pump shaft, characterized in that: A baffle is fixedly connected to the pump shaft. A threaded end is provided at the end of the pump shaft. An impeller plate is sleeved on the pump shaft. A fixing ring is fixedly connected to the impeller plate. A plurality of jacks are arranged in a circumferential array inside the fixing ring. A locking nut is threadedly connected to the threaded end. A locking device is provided inside the locking nut. The locking device includes a pin shaft. An end cover is fixedly connected to the end of the pin shaft. A spring is sleeved on the pin shaft. One end of the spring is fixedly connected to the end cover and the other end is fixedly connected to the locking nut.
2. The anti-loosening device for a centrifugal pump impeller according to claim 1, characterized in that: A plurality of insertion blocks are arranged in a circumferential array on the back side of the impeller plate. Insertion grooves are embedded on the side of the baffle facing the impeller plate and are in one-to-one correspondence with the insertion blocks.
3. The anti-loosening device for a centrifugal pump impeller according to claim 2, wherein: In the initial state of the spring, the pin shaft can pass through the locking nut.
4. The anti-loosening device for a centrifugal pump impeller according to claim 3, characterized in that: When the impeller plate is blocked by the baffle, the length of the threaded end exposed is equal to the thickness of the locking nut.
5. The anti-loosening device for a centrifugal pump impeller according to claim 4, characterized in that: Two groups of the locking devices are symmetrically arranged on the locking nut.
6. The anti-loosening device for a centrifugal pump impeller according to claim 5, characterized in that: The number of the jacks arranged in the circumferential array of the fixing ring is an even number.