Integrated impeller

Abstract

The utility model relates to an integral impeller, which comprises a gear box and an impeller train, and the gear box is provided with a mounting hole. The impeller train is provided with a connecting shaft and impellers arranged at the two ends of the connecting shaft, the connecting shaft is sleeved with the two impellers in a heating mode, the connecting shaft is rotatably arranged in the mounting hole, the impellers are arranged in the gearbox, and the diameter of the mounting hole is larger than that of the impellers. The connecting shaft is sleeved with the two impellers in a soaking mode to form the impeller gear train, then the hole diameter of the mounting hole is enlarged, so that the whole impeller gear train can penetrate through the mounting hole to be mounted in the gearbox, the impellers do not need to be movably sleeved, impeller clearance fit can be reduced, the overall rigidity of the impeller gear train after mounting is improved, and the service life of the impeller gear train is prolonged. And the problem of vibration is not easy to generate during high-speed rotation.

Description

Technical Field

[0001] The utility model relates to the technical field of impeller assembly, in particular to a fully assembled impeller. Background Art

[0002] In the process of installing the existing impeller into the gearbox, one impeller is first installed on one end of the shaft by shrink fitting, and then the shaft is installed through the mounting hole in the gearbox from one side, and then the other impeller is installed on the other end of the shaft by slip fitting, and finally the slip fitting impeller is fixed with a pin or a lock nut. However, since one of the impellers is installed by slip fitting, there is a large gap between the impeller and the shaft, which is prone to vibration problems when rotating at high speed. Utility Model Content

[0003] The purpose of the utility model is to provide a self-assembled impeller, which can form an impeller gear system by heat-isolating two impellers on a connecting shaft, and then by enlarging the aperture of the mounting hole so that the impeller gear system can pass through the mounting hole and be installed in the gear box without the need for a loose impeller, which can reduce the impeller clearance fit, improve the overall rigidity of the impeller gear system after installation, and is not prone to vibration problems during high-speed rotation.

[0004] In order to achieve the above-mentioned object, the utility model provides a self-contained impeller, comprising:

[0005] The gear box is provided with a mounting hole;

[0006] An impeller gear train is provided with a connecting shaft and impellers arranged at both ends of the connecting shaft, the two impellers are heat-shrink-fitted on the connecting shaft, the connecting shaft is rotatably placed in the mounting hole, and the impellers are arranged in the gear box;

[0007] The diameter of the mounting hole is greater than the diameter of the impeller.

[0008] Optionally, the difference between the diameter of the mounting hole and the diameter of the impeller is between 10 mm and 15 mm.

[0009] Optionally, a plurality of large bearings are provided between the connecting shaft and the mounting hole.

[0010] Optionally, two volute casing cavities are provided in the gearbox, and the two volute casing cavities are respectively located at two ends of the mounting hole and are connected to the mounting hole.

[0011] Optionally, the two impellers are located in the two volute cavities respectively.

[0012] Optionally, the diameter of the impeller is between 130 mm and 220 mm.

[0013] Optionally, the diameter of the connecting shaft is between 30 mm and 50 mm.

[0014] The beneficial effects of the utility model are as follows: an impeller gear train is formed by heat-isolating two impellers on a connecting shaft, and then the aperture of the mounting hole is enlarged so that the impeller gear train can pass through the mounting hole and be installed in the gear box without the need for a loose impeller, which can reduce the impeller clearance fit and improve the overall rigidity of the impeller gear train after installation, making it less likely to cause vibration problems during high-speed rotation.

[0015] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an impeller gear train of a self-contained impeller installed in a gear box according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic structural diagram of an impeller train of a self-contained impeller shown in one embodiment of the utility model;

[0018] In the figure: 1. gear box; 11. mounting hole; 12. volute cavity; 2. impeller gear train; 21. connecting shaft; 22. impeller; 3. large bearing. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] See also Figure 1 and Figure 2 A pre-assembled impeller 22 shown in a preferred embodiment of the present application comprises a gearbox 1 and an impeller train 2, wherein the gearbox 1 is provided with a mounting hole 11. The impeller train 2 is provided with a connecting shaft 21 and impellers 22 arranged at both ends of the connecting shaft 21, the two impellers 22 are heat-shielded on the connecting shaft 21, the connecting shaft 21 is rotatably placed in the mounting hole 11, the impeller 22 is arranged in the gearbox 1, and the diameter of the mounting hole 11 is larger than the diameter of the impeller 22.

[0023] In the process of installing the existing impeller 22 into the gearbox 1, one impeller 22 is first installed by shrink fitting on one end of the shaft, and then the shaft is installed through the mounting hole 11 in the gearbox 1 from one side, and then the other impeller 22 is installed by loose fitting on the other end of the shaft, and finally the loose fitting impeller 22 is fixed by a pin or a locking nut. However, since one of the impellers 22 is installed by loose fitting, there is a large gap between the impeller 22 and the shaft, which is prone to vibration problems when rotating at high speed.

[0024] Therefore, according to the solution of the embodiment of the utility model, the two impellers 22 are heat-fitted on the connecting shaft 21 to form the impeller gear train 2, and then the aperture of the mounting hole 11 is enlarged so that the impeller gear train 2 can pass through the mounting hole 11 and be installed in the gear box 1 without the need to loosen the impeller 22. This can reduce the clearance fit of the impeller 22, improve the overall rigidity of the impeller gear train 2 after installation, and is less likely to cause vibration problems during high-speed rotation.

[0025] The following is a detailed description with specific embodiments:

[0026] The difference between the diameter of the mounting hole 11 and the diameter of the impeller 22 is between 10 mm and 15 mm. Specifically, in this embodiment, in order to pass the impeller gear train 2 as a whole through the mounting hole 11, the gear box 1 needs to be redesigned, and the diameter of the mounting hole 11 is enlarged so that the diameter of the mounting hole 11 is about 10 mm larger than the diameter of the impeller 22, that is, the single-side distance is ensured to be about 5 mm, so that the impeller gear train 2 can just pass through the mounting hole 11 for installation.

[0027] See also Figure 1 A plurality of large bearings 3 are arranged between the connecting shaft 21 and the mounting hole 11. When the mounting hole 11 of the gear box 1 is redesigned, the bearings must also be redesigned. The outer diameter of the bearing 3 must be expanded to obtain a large bearing 3 in accordance with the expansion of the diameter of the mounting hole 11, so that the bearings 3 can cooperate with the mounting hole 11 of the gear box 1 and the connecting shaft 21.

[0028] See also Figure 1 The gearbox 1 is provided with two volute cavities 12, which are respectively located at both ends of the mounting hole 11 and communicated with the mounting hole 11, and the two impellers 22 are correspondingly located in the two volute cavities 12. During installation, firstly, the two impellers 22 are shrink-fitted on both ends of the connecting shaft 21 to form an impeller train 2, and then the impeller train 2 is pushed in from one end of the mounting hole 11 as a whole, so that both impellers 22 are located in the volute cavities at both ends of the mounting hole 11. After the impeller train 2 is installed, finally, the large bearing 3 is installed between the connecting shaft 21 and the mounting hole 11. Specifically, in this embodiment, the diameter of the impeller 22 is between 130mm-220mm, and the diameter of the connecting shaft 21 is between 30mm-50mm.

[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A self-contained impeller, characterized in that: include: The gear box is provided with a mounting hole; An impeller gear train is provided with a connecting shaft and impellers arranged at both ends of the connecting shaft, the two impellers are heat-shrink-fitted on the connecting shaft, the connecting shaft is rotatably placed in the mounting hole, and the impellers are arranged in the gear box; The diameter of the mounting hole is greater than the diameter of the impeller.

2. The self-contained impeller according to claim 1, characterized in that: The difference between the diameter of the mounting hole and the diameter of the impeller is between 10 mm and 15 mm.

3. The self-contained impeller according to claim 2, characterized in that: A plurality of large bearings are arranged between the connecting shaft and the mounting hole.

4. The self-contained impeller according to claim 1, characterized in that: Two volute cavities are arranged in the gear box, and the two volute cavities are respectively located at two ends of the mounting hole and communicated with the mounting hole.

5. The self-contained impeller according to claim 4, characterized in that: The two impellers are correspondingly located in the two volute cavities.

6. The self-contained impeller according to claim 2, characterized in that: The diameter of the impeller is between 130 mm and 220 mm.

7. The self-contained impeller according to claim 6, characterized in that: The diameter of the connecting shaft is between 30 mm and 50 mm.

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