Impeller locking structure with self-locking effect and centrifugal compressor

Abstract

The present invention provides an impeller locking structure with a self-locking effect and a centrifugal compressor. The impeller locking structure includes a rotating shaft and two impellers arranged at both ends of the rotating shaft. Each impeller is locked to the rotating shaft by a locking nut, and the thread directions of the two locking nuts are opposite. For the impeller locking structure with a self-locking effect and the centrifugal compressor provided by the present invention, the thread directions of the two locking nuts are set to be opposite, so that after the impeller is locked, the locking direction is the same as the rotation direction of the rotating shaft, solving the problem that the locking nut is prone to loosen during operation in the prior art. An auxiliary nut is arranged at the end of the rotating shaft for support or a rotation stopping structure is arranged to limit the rotation of the rotating shaft, thereby facilitating the locking of the locking nut and solving the problem of difficult assembly of the locking nut, and enhancing the reliability of the compressor during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of impeller installation and locking structures, and particularly to an impeller locking structure with a self-locking effect and a centrifugal compressor. Background Art

[0002] In a compressor with double-ended suspension, two locking nuts are required at each end of the shafting parts of the compressor for locking. As shown in the traditional locking structure Figure 1 , when the thread directions of the two locking nuts are the same, during assembly, only by tightening the two locking nuts at both ends simultaneously can both locking nuts be tightened, thereby locking the two impellers. However, when the compressor is running and the rotor rotates at high speed, regardless of the rotation direction, the thread direction of one of the locking nuts is opposite to the rotation direction of the rotor, which easily causes the locking nut to become looser and looser during rotation. Over time, it is possible for the locking nut to become loose. And if the thread directions of both locking nuts are the same as the rotation direction of the rotor, at this time, both locking nuts at both ends become tighter and tighter during rotation. However, during assembly, due to the opposite thread directions of the two locking nuts, they cannot be tightened. Summary of the Invention

[0003] In order to solve the technical problem in the prior art that the locking degree between the locking nut and the impeller is low, an impeller locking structure with a self-locking effect and a centrifugal compressor that increase the locking degree of the locking nut to the impeller are provided.

[0004] An impeller locking structure includes a rotating shaft and two impellers arranged at both ends of the rotating shaft. Each impeller is locked to the rotating shaft by a locking nut. The thread directions of the two locking nuts are opposite. The structure further includes auxiliary nuts, which are arranged on the side of the locking nut away from the corresponding impeller, and the thread direction of the auxiliary nut is opposite to that of the adjacent locking nut.

[0005] The number of the auxiliary nuts is two, and one auxiliary nut is arranged on the side of each locking nut away from the corresponding impeller.

[0006] A threaded section matching the locking nut is arranged on the rotating shaft, and the locking direction of the locking nut and the corresponding threaded section is the same as the rotation direction of the rotating shaft.

[0007] An auxiliary threaded section is further arranged on the rotating shaft. The auxiliary threaded section is arranged at the end of the threaded section away from the impeller, and the thread direction of the auxiliary threaded section is opposite to that of the adjacent threaded section.

[0008] The outer diameter of the auxiliary threaded section is smaller than that of the threaded section.

[0009] When locking the impeller, the auxiliary nut and the locking nut with the same rotation direction rotate simultaneously.

[0010] After the impeller is locked, the auxiliary nut disengages from the rotating shaft.

[0011] A centrifugal compressor includes the above impeller locking structure.

[0012] The impeller locking structure and the centrifugal compressor with a self-locking effect provided by the present invention set the thread rotation directions of the two locking nuts to be opposite, so that after the impeller is locked, the locking direction is the same as the rotation direction of the rotating shaft, solving the problem that the locking nut is prone to looseness during operation in the prior art. An auxiliary nut is provided at the end of the rotating shaft for support or a rotation stopping structure is provided to limit the rotation of the rotating shaft, thereby facilitating the locking of the locking nut and solving the problem of difficult assembly of the locking nut, enhancing the reliability of the compressor during operation. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the impeller locking structure of the embodiment of the impeller locking structure and the centrifugal compressor with a self-locking effect provided by the present invention;

[0014] In the figure:

[0015] 1, rotating shaft; 2, impeller; 3, locking nut; 4, auxiliary nut; 5, rotation stopping structure. Detailed Embodiment

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] As Figure 1The shown impeller locking structure includes a rotating shaft 1 and two impellers 2 arranged at both ends of the rotating shaft 1. Each impeller 2 is locked to the rotating shaft 1 by a locking nut 3. The thread directions of the two locking nuts 3 are opposite. It also includes an auxiliary nut 4. The auxiliary nut 4 is arranged on the side of the locking nut 3 away from the corresponding impeller 2, and the thread direction of the auxiliary nut 4 is opposite to that of the adjacent locking nut 3. Setting the thread directions of the two locking nuts 3 to be opposite makes the locking direction the same as the rotation direction of the rotating shaft 1 after the impeller 2 is locked, solving the problem that the locking nut 3 in the prior art is prone to loosening during operation. However, the locking directions of the two locking nuts 3 are opposite, and it is impossible to lock the two locking nuts 3 simultaneously in the same locking direction. Therefore, an auxiliary nut 4 is arranged at the end of the rotating shaft 1 for support, and the auxiliary nut 4 and the locking nut 3 with the same thread rotate simultaneously, so as to complete the locking of one locking nut 3 and one auxiliary nut 4 in one locking direction. Then, switch the locking direction to lock the other locking nut 3 and the other auxiliary nut 4, and the locking of the two locking nuts 3 can be completed, that is, it is possible to assemble the locking nut 3 using the locking method in the prior art, thus facilitating the locking of the locking nut 3 and solving the problem of difficult assembly of the locking nut 3, enhancing the reliability of the compressor during operation.

[0018] The number of the auxiliary nuts 4 is two. One auxiliary nut 4 is arranged on the side of each locking nut 3 away from the corresponding impeller 2, and one auxiliary nut 4 cooperates with one locking nut 3, facilitating the assembly of the two locking nuts 3 using the traditional locking method.

[0019] A threaded section matching the locking nut 3 is arranged on the rotating shaft 1, and the locking direction of the locking nut 3 and the corresponding threaded section is the same as the rotation direction of the rotating shaft 1. Thus, when the rotating shaft 1 rotates, the locking nut 3 can always be locked with the rotating shaft 1 to overcome the problem that the locking nut 3 in the prior art is prone to loosening.

[0020] An auxiliary threaded section is also arranged on the rotating shaft 1. The auxiliary threaded section is arranged at the end of the threaded section away from the impeller 2, and the thread direction of the auxiliary threaded section is opposite to that of the adjacent threaded section, so that there is no interference between the adjacent locking nut 3 and the auxiliary nut 4.

[0021] The outer diameter of the auxiliary threaded section is smaller than that of the threaded section, that is, a stepped structure is formed at the end of the rotating shaft 1 to prevent the auxiliary nut 4 from entering the threaded section and damaging the thread of the threaded section.

[0022] Among them, during the process of locking the impeller 2, the locking torque needs to first meet the locking torque of the locking nut 3, but the locking torque should not be greater than the maximum limit torque of the auxiliary nut 4, so as to avoid the problem of the auxiliary nut 4 slipping and causing it to be unable to be disassembled. Similarly, in order to ensure that the locking torque of the auxiliary nut 4 is not much different from the locking torque of the locking nut 3, the outer diameter of the auxiliary thread section and the outer diameter of the thread section should also not be much different.

[0023] When locking the impeller 2, the auxiliary nut 4 and the locking nut 3 with the same rotation direction rotate simultaneously, so as to facilitate locking by using the locking method in the prior art.

[0024] After the impeller 2 is locked, the locking nut 3 can already meet the locking requirements of the impeller 2. Therefore, the auxiliary nut 4 is disengaged from the rotating shaft 1 to reduce the energy required for the rotation of the rotating shaft 1 and improve the efficiency of the impeller 2.

[0025] A centrifugal compressor includes the above impeller locking structure.

[0026] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An impeller locking structure, comprising a rotating shaft (1) and two impellers (2) arranged at both ends of the rotating shaft (1). Each impeller (2) is locked to the rotating shaft (1) by a locking nut (3), and the thread directions of the two locking nuts (3) are opposite. Characterized in that: It further includes an auxiliary nut (4). The auxiliary nut (4) is arranged on the side of the locking nut (3) away from the corresponding impeller (2), and the thread direction of the auxiliary nut (4) is opposite to that of the adjacent locking nut (3); a thread section matching the locking nut (3) is arranged on the rotating shaft (1), and the locking direction of the locking nut (3) and the corresponding thread section is the same as the rotating direction of the rotating shaft (1); when locking the impeller (2), the auxiliary nut (4) and the locking nut (3) with the same thread direction rotate simultaneously; after the impeller (2) is locked, the auxiliary nut (4) is disengaged from the rotating shaft (1).

2. The impeller locking structure according to claim 1, Characterized in that: The number of the auxiliary nuts (4) is two, and one auxiliary nut (4) is arranged on the side of each locking nut (3) away from the corresponding impeller (2).

3. The impeller locking structure according to claim 1, Characterized in that: An auxiliary thread section is further arranged on the rotating shaft (1). The auxiliary thread section is arranged at one end of the thread section away from the impeller (2), and the thread direction of the auxiliary thread section is opposite to that of the adjacent thread section.

4. The impeller locking structure according to claim 3, Characterized in that: The outer diameter of the auxiliary thread section is smaller than the outer diameter of the thread section.

5. A centrifugal compressor, Characterized in that: It includes the impeller locking structure according to any one of claims 1 to 4.

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