Shrinkage sleeve connection blade disc structure in small differential pressure turbine
By using a red-sleeve interference fit connection, the machining accuracy and space occupation issues of the impeller and drive shaft in small differential pressure turbines are solved, achieving simple installation and efficient torque transmission, and improving dynamic balance performance.
Patent Information
- Application Number
- CN202520264838.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-19
AI Technical Summary
In existing small differential pressure turbines, the connection structure between the impeller and the drive shaft has problems such as high machining accuracy requirements, complex assembly, and large space occupation.
The connection method of red sleeve interference fit is adopted. The drive shaft and impeller are interference fit by positioning key. Combined with heat fitting method, the connection between impeller and drive shaft is realized, which simplifies the machining and assembly process.
It reduces processing difficulty, simplifies installation steps, saves space, effectively transmits torque, and improves dynamic balance performance.
Smart Images
Figure CN223894206U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to small size differential pressure turbine technology field especially relates to a small size differential pressure turbine in red suit connection blade disc structure. BACKGROUND
[0002] In the prior art small size differential pressure turbine, the blade disc connection usually adopts end face tooth or bolt connection structure. 1) End face tooth connection refers to that the blade disc inlet side is an end face tooth, the driving shaft blade disc side is an end face tooth, the blade disc and the driving shaft are connected through the end face tooth meshing transmission torque, and are positioned through a center pull rod bolt and a nut. 2) Bolt connection refers to that the blade disc side of the driving shaft is a flange structure, the pitch circle is uniformly provided with threaded holes, and the blade disc is provided with a positioning through hole at a corresponding position, and the driving shaft and the blade disc are connected through the bolt to transmit torque and positioning.
[0003] However, the above connection structure has the following problems: 1) The end face tooth connection form needs to grind the blade disc and the driving shaft, which has high machining precision requirements and increases the machining cost, and it is difficult to ensure the runout value after the end tooth meshing, and the end tooth meshing is a major factor affecting the rotor dynamic balance. 2) The bolt connection form fastens the blade disc and the driving shaft with bolts, and if a larger torque needs to be transmitted, the bolt specification needs to be upgraded, which occupies a large space.
[0004] Therefore, a blade disc connection structure form with low processing difficulty, simple assembly steps and convenient installation is needed. INVENTION CONTENTS
[0005] The utility model discloses a small size differential pressure turbine in red suit connection blade disc structure, which solves the problems in the prior art.
[0006] The driving shaft is provided with a positioning key.
[0007] The positioning key is arranged on the driving shaft, and the width direction of the positioning key is in red suit interference fit with the driving shaft.
[0008] The blade disc is sleeved on the periphery of the driving shaft and is in red suit interference fit with the outer diameter of the driving shaft.
[0009] Further, the driving shaft is provided with a positioning key mounting groove in the radial direction for accommodating the positioning key, and the groove width of the positioning key mounting groove is less than the width of the positioning key.
[0010] Further, the positioning key fixing groove is provided at the position matched with the positioning key on the inner hole of the blade disc, and the width of the positioning key fixing groove is less than the width of the positioning key.
[0011] Further, the thickness of the positioning key is less than the sum of the groove depths of the positioning key mounting groove and the positioning key fixing groove.
[0012] Further, the inner hole diameter size of the blade disc is less than the outer diameter size of the driving shaft.
[0013] Compared with the prior art, the utility model has the beneficial effects that:
[0014] 1, the utility model discloses a small -size differential pressure turbine's red cover connection blade disc structure in red cover interference fit is connected in the blade disc and driving shaft, is positioned through the positioning key, wherein, positioning key width direction and driving shaft red cover interference fit, driving shaft outer diameter and blade disc inner diameter red cover interference fit, positioning key height direction and blade disc clearance fit, blade disc, driving shaft and positioning key can process respectively, need not together processing, the requirement to processing precision is lower, installation mode is simple, can pass through big torque, save space, application is more extensive. BRIEF DESCRIPTION OF DRAWINGS
[0015] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings provide insight into further aspects of the present utility model, and constitute a part of the specification, together with the embodiments of the present utility model, for explaining the present utility model, and do not constitute a limitation on the present utility model. In the drawings:
[0016] Fig. 1 It is a red cover connection section view schematic drawing of the utility model discloses a small -size differential pressure turbine's red cover connection blade disc structure.
[0017] Fig. 2 It is a red cover connection side surface schematic drawing of the utility model discloses a small -size differential pressure turbine's red cover connection blade disc structure.
[0018] REFERENCE NUMERALS
[0019] 1: driving shaft;
[0020] 2: positioning key;
[0021] 3: blade disc. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further detailed in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.
[0023] For the purpose of simplicity and brevity of the drawings, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, for the purpose of simplicity and brevity of the drawings, in some drawings, only one of the parts having the same structure or function is shown schematically, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one".
[0024] First embodiment
[0025] Please refer to Figs. 1-2 The technical scheme of the red suit connecting blade disc structure in a small differential pressure turbine provided by the embodiment comprises the following steps:
[0026] A driving shaft 1;
[0027] A positioning key 2 is arranged on the driving shaft 1, and the width direction of the positioning key 2 is in red suit interference fit with the driving shaft 1.
[0028] A blade disc 3 is sleeved on the periphery of the driving shaft 1 and is in red suit interference fit with the outer diameter of the driving shaft 1; wherein the width direction of the positioning key 2 is in red suit interference fit with the blade disc 3, and the height direction of the positioning key 2 is in clearance fit with the blade disc 3.
[0029] In specific implementation, red suit, also known as hot mounting method, is a method of assembling by using the physical characteristics of thermal expansion and cold contraction of metal materials. The hole is heated to expand, and then the object to be installed is installed in the expanded hole. After the hole cools and shrinks, the object and the hole form an interference fit. The matching parts formed in this way can transmit axial force, torque or axial force and torque at the same time.
[0030] Therefore, in order to realize the red suit interference fit of the driving shaft 1 and the positioning key 2, a positioning key mounting groove for accommodating the positioning key 2 is arranged on the radial direction of the driving shaft 1. In order to meet the interference fit of the positioning key 2 and the positioning key mounting groove after cold shrinkage, the groove width of the positioning key mounting groove needs to be slightly smaller than the width of the positioning key 2.
[0031] Similarly, in order to realize the red suit interference fit of the width direction of the blade disc 3 and the positioning key 2, a positioning key fixing groove is arranged on the inner hole of the blade disc 3 at the matching position of the positioning key 2. In order to meet the interference fit of the positioning key 2 and the positioning key fixing groove after cold shrinkage, the width of the positioning key fixing groove needs to be slightly smaller than the width of the positioning key 2.
[0032] Similarly, in order to make the inner diameter of the blade disc 3 and the driving shaft 1 red set interference fit, the inner hole diameter of the blade disc 3 is set to be slightly smaller than the outer diameter of the driving shaft 1, and in addition, the thickness of the positioning key 2 is smaller than the sum of the groove depth of the positioning key mounting groove and the positioning key fixing groove, so as to satisfy the gap between the positioning key 2 and the inner diameter of the blade disc 3 in the height direction, and the two are clearance fit in the height direction.
[0033] The installation process of the red set connecting blade disc structure in the small differential pressure turbine provided by the utility model is as follows:
[0034] Before installation, the positioning key mounting groove is heated first, so that the positioning key mounting groove on the driving shaft 1 is relatively expanded, and then the positioning key 2 is red set on the driving shaft 1; similarly, the blade disc 3 is heated, so that the inner diameter of the blade disc 3 and the positioning key fixing groove are relatively expanded, and then the blade disc 3 is red set on the whole of the driving shaft 1 and the positioning key 2, so as to ensure that the centers of the driving shaft 1 and the blade disc 3 are consistent, which is beneficial to the overall dynamic balance of the two, the gas drives the blade disc 3 to work, the driving shaft 1 outputs power, and the effect of energy recycling is achieved.
[0035] Finally, it should be pointed out that: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A red-sleeved connecting impeller structure in a small differential pressure turbine, characterized in that, include: Drive shaft; A positioning key is configured on the drive shaft, and the width direction of the positioning key is interference-fitted with the drive shaft bushing. An impeller is fitted around the drive shaft and has an interference fit with the outer diameter of the drive shaft; wherein, the positioning key has an interference fit with the impeller sleeve in the width direction and a clearance fit with the impeller in the height direction.
2. The red-sleeved connecting impeller structure in the small differential pressure turbine according to claim 1, characterized in that: The drive shaft is provided with a locating key mounting groove in the radial direction for accommodating the locating key, and the width of the locating key mounting groove is smaller than the width of the locating key.
3. The red-sleeved connecting impeller structure in the small differential pressure turbine according to claim 2, characterized in that: The inner hole of the impeller is provided with a positioning key fixing groove at a position that matches the positioning key, and the width of the positioning key fixing groove is smaller than the width of the positioning key.
4. The red-sleeved connecting bladed disk structure in the small differential pressure turbine according to claim 3, characterized in that: The thickness of the positioning key is less than the sum of the depths of the positioning key mounting groove and the positioning key fixing groove.
5. The red-sleeved connecting bladed disk structure in the small differential pressure turbine according to claim 1, characterized in that: The inner diameter of the impeller is smaller than the outer diameter of the drive shaft.