Combined impeller and mounting tool thereof

By using a dual-alloy design for the combined impeller and specialized tooling, the corrosion and damage problems of the impeller under harsh working conditions are solved, resulting in cost reduction and service life extension, while ensuring the accuracy and firmness of installation.

CN223536615UActive Publication Date: 2025-11-11DATONG BEIFANG TIANLI PRESSURE BOOSTING TECH CO LTD
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Patent Information

Application Number
CN202423159772.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-11-11
Estimated Expiration
2034-12-20

AI Technical Summary

Technical Problem

The impeller of the booster for biogas generator is corroded by corrosive air and impurity particles under harsh working conditions, resulting in blade damage, and the all-titanium-aluminum alloy material is expensive.

Method used

It adopts a dual alloy combination structure of guide impeller and working impeller. The guide impeller is made of TC4 titanium-aluminum alloy and the working impeller is made of 2A70 aluminum alloy. Precise installation is achieved through the design of clamping screws, positioning pins and connecting protrusions and grooves. It is equipped with wire thread sleeves and special tooling to ensure installation accuracy and prevent damage.

Benefits of technology

It improves the service life of the impeller, reduces costs, and ensures the connection strength and shear strength of the impeller through precise installation design, thereby reducing air resistance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of superchargers, and particularly relates to a combined impeller and a mounting tool thereof, which comprise an air guide impeller and a working impeller, and the air guide impeller is connected with the working impeller through a compression screw; one end of the compression screw penetrates through the air guide impeller and is in threaded connection with the working impeller; the air guide impeller and the working impeller are positioned through a positioning pin, and the air guide impeller and the working impeller are both provided with corresponding pin holes; the air guide impeller is provided with a connecting groove, and the working impeller is provided with a connecting protrusion connected with the connecting groove in an inserted mode. The air guide impeller and the working impeller are made of two different alloy materials. The air guide impeller is made of TC titanium aluminum alloy, and the working impeller is still made of A aluminum alloy. The corrosion resistance and the impact resistance of the TC titanium-aluminum alloy material are superior to those of the A aluminum alloy material; therefore, the cost of the impeller is reduced while the service life of the impeller is prolonged.
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Description

Technical Field

[0001] This utility model belongs to the field of turbocharger technology, specifically relating to a combined impeller and its installation fixture. Background Technology

[0002] The operating conditions of the booster compressor in a biogas generator are harsh. The air drawn into the compressor impeller is highly corrosive and contains many impurities and particles, causing significant erosion to the impeller blades. Traditional impellers are made of milled 2A70 aluminum alloy. Although this material has excellent mechanical properties, practical experience has shown that under these conditions, the guide vane blades become damaged and incomplete. Considering the high cost of using an all-titanium-aluminum alloy, further research is needed. Utility Model Content

[0003] To address the aforementioned technical problems, one objective of this utility model is to provide a combined impeller that employs a dual-alloy combination, which not only improves the impeller's service life but also significantly reduces its cost compared to titanium alloy impellers. Another objective of this utility model is to provide an installation fixture for mounting the aforementioned combined impeller.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A combined impeller includes a guide impeller and a working impeller, which are connected by a clamping screw. One end of the clamping screw passes through the guide impeller and is threaded into the working impeller. The guide impeller and the working impeller are positioned by a locating pin, and both the guide impeller and the working impeller have corresponding pin holes. The guide impeller has a connecting groove, and the working impeller has a connecting protrusion that inserts into the connecting groove. The guide impeller and the working impeller are made of two different alloy materials.

[0006] The air guide impeller is made of TC4 titanium-aluminum alloy; the working impeller is made of 2A70 aluminum alloy.

[0007] The working impeller is provided with a connecting threaded hole, and a wire threaded sleeve that is connected to the clamping screw is fixed in the connecting threaded hole.

[0008] The positioning pin is a stepped shaft shape, which consists of a limiting part and a fixing part from top to bottom. The fixing part is connected to the pin hole of the working impeller, and the limiting part is connected to the pin hole of the guide impeller.

[0009] The diameter of the limiting part is smaller than the diameter of the fixing part, and the step of the positioning pin is provided with an arc transition; the positioning pin is provided with an exhaust hole; the upper and lower ends of the positioning pin are provided with chamfers.

[0010] The height of the connecting protrusion is greater than the height of the limiting part.

[0011] The head of the clamping screw is round and has a protrusion.

[0012] The protrusion is shaped like a flower.

[0013] An installation fixture includes a working impeller installation fixture, the working impeller installation fixture includes a connecting plate and a connecting screw, the connecting plate is provided with a first positioning groove corresponding to a connecting protrusion; one end of the connecting screw passes through the connecting plate and is threadedly connected to the working impeller; a connecting pin that is inserted into the working impeller is fixed on the connecting plate; and a prism is provided on the connecting plate.

[0014] The prism is a hexagonal prism and also includes a pin mounting ring. The pin mounting ring is annular and has a second positioning groove corresponding to the connecting protrusion. The pin mounting ring is provided with a positioning pin hole corresponding to the pin hole on the working impeller.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] Compared to using an all-titanium-aluminum alloy, this invention proposes a dual-alloy combined impeller structure; that is, the guide impeller is made of TC titanium-aluminum alloy, while the working impeller is still made of A aluminum alloy. TC titanium-aluminum alloy has superior corrosion resistance and impact resistance compared to A aluminum alloy; therefore, it improves the impeller's service life while reducing its cost.

[0017] The connecting protrusion and connecting groove act as guides during installation; positioning pins and clamping screws ensure the installation accuracy and secure connection between the air guide impeller and the working impeller.

[0018] The steel wire thread sleeve is installed to protect the thread profile of the working impeller and prevent damage to the working impeller if the guide impeller needs to be replaced multiple times.

[0019] The locating pin is a stepped shaft, consisting of a limiting part and a fixing part from top to bottom; this structure facilitates the differentiation of the upper and lower ends during installation. Chamfers at both ends improve assembly convenience. An exhaust hole is provided to expel air from the working impeller pin hole when the locating pin is pressed in. The stepped section, which is the shear-bearing part of the locating pin, has a rounded transition to increase its shear strength.

[0020] The height of the connecting protrusion is greater than the height of the limiting part. This ensures that during the assembly of the guide impeller, the connecting protrusion of the working impeller first enters the connecting groove of the guide impeller, and then rotating the guide impeller allows the locating pin to enter the pin hole of the guide impeller. This allows for quick and accurate assembly.

[0021] The head of the clamping screw is rounded and connects to the hub of the air guide impeller to reduce air resistance during the intake process. Meanwhile, the protrusion, unlike the traditional hexagonal or external hexagonal shape, adopts a petal-shaped design and requires specialized tooling for installation and removal.

[0022] Considering the impeller's split structure, it's difficult to install it as a single unit onto the shaft; therefore, a separate installation method is adopted. First, the working impeller is screwed into the shaft with a certain torque, and then the guide vane is installed. A dedicated working impeller installation fixture is provided during the installation of the working impeller. Additionally, a pin mounting ring is included to ensure the accurate positioning of the locating pin. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model;

[0024] Figure 2 This is a front view of the air guide impeller in Embodiment 1 of this utility model;

[0025] Figure 3 This is a half-sectional structural diagram of the air guide impeller in Embodiment 1 of this utility model;

[0026] Figure 4 This is a half-sectional structural diagram of the working impeller in Embodiment 1 of this utility model;

[0027] Figure 5 This is a partial front view of the working impeller in Embodiment 1 of this utility model;

[0028] Figure 6 This is a front view of the clamping screw in Embodiment 1 of this utility model;

[0029] Figure 7 This is a top view of the clamping screw in Embodiment 1 of this utility model;

[0030] Figure 8 This is a half-sectional structural diagram of the positioning pin in Embodiment 1 of this utility model;

[0031] Figure 9 This is a half-sectional view of the connecting disc in Embodiment 2 of this utility model;

[0032] Figure 10 This is a top view of the connecting plate in Embodiment 2 of this utility model;

[0033] Figure 11 This is a schematic diagram of the usage state of Embodiment 2 of this utility model;

[0034] Figure 12 This is a top view of the pin mounting ring in Embodiment 2 of this utility model;

[0035] Figure 13This is a half-sectional structural diagram of the pin mounting ring in Embodiment 2 of this utility model;

[0036] Wherein: 1 is the air guide impeller, 10 is the connecting groove, 2 is the working impeller, 20 is the connecting protrusion, 3 is the clamping screw, 30 is the head, 31 is the protrusion, 4 is the positioning pin, 40 is the limiting part, 41 is the fixing part, 42 is the arc transition, 43 is the exhaust hole, 44 is the chamfer, 5 is the pin hole, 6 is the connecting pin hole, 7 is the wire thread sleeve, 8 is the working impeller mounting fixture, 80 is the connecting plate, 81 is the connecting screw, 82 is the first positioning groove, 83 is the connecting pin, 84 is the prism, 9 is the pin shaft mounting ring, 90 is the second positioning groove, and 91 is the positioning pin hole. Detailed Implementation

[0037] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0038] Example 1

[0039] like Figure 1-8 As shown, a combined impeller includes a guide impeller 1 and a working impeller 2. The guide impeller 1 and the working impeller 2 are connected by a clamping screw 3. One end of the clamping screw 3 passes through the guide impeller 1 and is threadedly connected to the working impeller 2. The fixed connection between the guide impeller 1 and the working impeller 2 can be achieved by tightening the clamping screw 3.

[0040] To ensure proper positioning, the guide impeller 1 and the working impeller 2 are positioned using locating pins 4. Both the guide impeller 1 and the working impeller 2 have corresponding pin holes 5. Simultaneously, the guide impeller 1 has a connecting groove 10, and the working impeller 2 has a connecting protrusion 20 that engages with the connecting groove 10. The engagement of the connecting protrusion 20 with the connecting groove 10 serves a guiding function. The guide impeller 1 and the working impeller 2 are made of two different alloy materials; furthermore, the number of locating pins 4 is determined according to actual requirements.

[0041] Furthermore, the guide impeller 1 is preferably made of TC4 titanium-aluminum alloy, a material already available in the technology; the working impeller 2 is made of 2A70 aluminum alloy, a material already available in the technology. That is, this combined impeller uses existing alloy materials.

[0042] Furthermore, the working impeller 2 is provided with a connecting threaded hole, and a wire threaded sleeve 7 connected to the clamping screw 3 is fixed in the connecting threaded hole. The purpose of providing the wire threaded sleeve 7 is to prevent damage to the threads of the working impeller 2 when the guide impeller 1 is replaced multiple times.

[0043] Furthermore, the positioning pin 4 is a stepped shaft, consisting of a limiting part 40 and a fixing part 41 from top to bottom. The fixing part 41 connects to the pin hole 5 of the working impeller 2, and the limiting part 40 connects to the pin hole 5 of the guide impeller 1. The stepped shaft structure facilitates differentiation during installation. Specifically, the fixing part 41 and the pin hole 5 of the working impeller 2 have an interference fit, while the limiting part 40 and the pin hole 5 of the guide impeller 1 have a clearance fit.

[0044] Furthermore, the diameter of the limiting part 40 is smaller than the diameter of the fixing part 41, and the step (shear-bearing part) of the positioning pin 4 is provided with an arc transition 42 to increase its shear resistance.

[0045] Specifically, the locating pin 4 and the pin hole 5 of the working impeller 2 are interference-fitted. The locating pin 4 is provided with an exhaust hole 43 to facilitate the discharge of air from the pin hole 5 of the working impeller 2 when the locating pin 4 is pressed in. The upper and lower ends of the locating pin 4 are provided with chamfers 44, preferably 15° chamfers 44, for guidance, which can improve the convenience of assembly.

[0046] Furthermore, the height value A of the connecting protrusion 20 is greater than the height value B of the limiting part 40. When assembling the air guide impeller 1, the connecting protrusion 20 of the working impeller 2 first enters the connecting groove 10 of the air guide impeller 1, and then the air guide impeller 1 is rotated and pressed down so that the positioning pin 4 is aligned with the pin hole 5 and inserted into the pin hole 5 of the air guide impeller 1.

[0047] Furthermore, the head 30 of the clamping screw 3 is rounded and connects to the hub of the air guide impeller 1 to reduce air resistance during the intake process. At the same time, the protrusion 31, instead of the traditional hexagonal or hexagonal shape, adopts a petal-shaped form, requiring special tooling for installation and removal.

[0048] Example 2

[0049] Considering that the impeller is a split structure, it is not easy to install it as a whole onto the shaft, so a separate installation method is adopted. First, the working impeller 2 is screwed into the shaft with a certain torque, and then the guide impeller 1 is installed. Special tooling is required when installing the working impeller 2.

[0050] Therefore, this embodiment provides an installation fixture based on embodiment one, such as... Figure 9-13As shown, the installation fixture includes a working impeller installation fixture 8, which includes a connecting plate 80 and connecting screws 81. The connecting plate 80 has a first positioning groove 82 corresponding to the connecting protrusion 20, which serves as a positioning tool for installation. One end of the connecting screw 81 passes through the connecting plate 80 and is threadedly connected to the working impeller 2 for temporary fixation. A connecting pin 83 that is inserted into the working impeller 2 is fixed on the connecting plate 80. To facilitate rotation of the connecting plate 80 using tools such as a wrench during installation, a prism 84 is provided on the connecting plate 80. Specifically, four connecting pins 83 are preferably provided, and four corresponding connecting pin holes 6 are provided on the working impeller 2; the prism 84 is preferably a hexagonal prism.

[0051] First, use the wire thread insert 7 installation tool to install the wire thread insert 7 into the connecting threaded hole of the working impeller 2. Next, tighten the working impeller 2 onto the turbine shaft; the specific process is as follows: insert the first positioning groove 82 of the connecting plate 80 into the working impeller 2, and insert the connecting pin 83 into the connecting pin hole 6 of the working impeller 2; then, pass one end of the connecting screw 81 through the connecting plate 80 and thread it onto the working impeller 2 to temporarily fix the connecting plate 80 and the working impeller 2; finally, use a wrench to clamp the prism 84 and drive the connecting plate 80 to rotate, and further transmit the rotation to the working impeller 2 through the connecting pin 83, screwing the working impeller 2 onto the turbine shaft to complete the installation of the working impeller 2. Before installing the working impeller 2, the turbine shaft needs to be fixed.

[0052] After the working impeller 2 is installed, press the locating pin 4 into the working impeller 2 with an interference fit. Then install the guide impeller 1. The specific installation process is as follows: insert the connecting groove 10 of the guide impeller 1 into the connecting protrusion 20 of the working impeller 2; then rotate and press down the guide impeller 1 so that the pin hole 5 on it aligns with the locating pin 4 and the two are inserted. Finally, pass one end of the clamping screw 3 through the guide impeller 1 and screw it into the wire thread sleeve 7 inside the working impeller 2 to press the guide impeller 1 and the working impeller 2 together.

[0053] Furthermore, it also includes a pin mounting ring 9, which is annular and has a second positioning groove 90 corresponding to the connecting protrusion 20. The pin mounting ring 9 is provided with a positioning pin hole 91 corresponding to the pin hole 5 on the working impeller 2. Specifically, the thickness of the pin mounting ring 9 is equal to the height B of the limiting part 40.

[0054] In use, the connecting protrusion 20 is inserted into the second positioning groove 90 of the pin mounting ring 9, and the positioning pin hole 91 is aligned with the pin hole 5 on the working impeller 2. Then, the lower end of the positioning pin 4 is pressed into the working impeller 2 through the second positioning groove 90 with an interference fit, and the pressing depth is limited by the positioning pin 4 mounting fixture; when the upper end of the positioning pin 4 is flush with the upper end face of the pin mounting ring 9, the positioning pin 4 can be considered to be installed in place.

[0055] The above description only describes the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. A combined impeller, characterized in that: It includes a guide impeller (1) and a working impeller (2), the guide impeller (1) and the working impeller (2) are connected by a clamping screw (3); one end of the clamping screw (3) passes through the guide impeller (1) and is threadedly connected to the working impeller (2); the guide impeller (1) and the working impeller (2) are positioned by a positioning pin (4), and both the guide impeller (1) and the working impeller (2) are provided with corresponding pin holes (5); the guide impeller (1) is provided with a connecting groove (10), and the working impeller (2) is provided with a connecting protrusion (20) that is inserted into the connecting groove (10); the guide impeller (1) and the working impeller (2) are made of two different alloy materials.

2. The combined impeller according to claim 1, characterized in that: The air guide impeller (1) is made of TC4 titanium-aluminum alloy; the working impeller (2) is made of 2A70 aluminum alloy.

3. A combined impeller according to claim 1, characterized in that: The working impeller (2) is provided with a connecting threaded hole, and a wire threaded sleeve (7) connected to the clamping screw (3) is fixed in the connecting threaded hole.

4. A combined impeller according to claim 1, characterized in that: The positioning pin (4) is a stepped shaft, which consists of a limiting part (40) and a fixing part (41) from top to bottom. The fixing part (41) is connected to the pin hole (5) of the working impeller (2), and the limiting part (40) is connected to the pin hole (5) of the guide impeller (1).

5. A combined impeller according to claim 4, characterized in that: The diameter of the limiting part (40) is smaller than the diameter of the fixing part (41), and the step of the positioning pin (4) is provided with an arc transition (42); the positioning pin (4) is provided with an exhaust hole (43); the upper and lower ends of the positioning pin (4) are provided with chamfers (44).

6. A combined impeller according to claim 4, characterized in that: The height of the connecting protrusion (20) is greater than the height of the limiting part (40).

7. A combined impeller according to claim 1, characterized in that: The head (30) of the clamping screw (3) is round and has a protrusion (31).

8. A combined impeller according to claim 7, characterized in that: The protrusion (31) is shaped like a flower.

9. An installation fixture for installing the working impeller (2) in a combined impeller as described in claim 1, characterized in that: The impeller mounting fixture (8) includes a connecting plate (80) and a connecting screw (81). The connecting plate (80) is provided with a first positioning groove (82) corresponding to the connecting protrusion (20). One end of the connecting screw (81) passes through the connecting plate (80) and is threaded to the impeller (2). A connecting pin (83) that is inserted into the impeller (2) is fixed on the connecting plate (80). A prism (84) is provided on the connecting plate (80).

10. An installation fixture according to claim 9, characterized in that: The prism (84) is a hexagonal prism (84) and also includes a pin mounting ring (9). The pin mounting ring (9) is annular and has a second positioning groove (90) corresponding to the connecting protrusion (20). The pin mounting ring (9) is provided with a positioning pin hole (91) corresponding to the pin hole (5) on the working impeller (2).