Sealing tool for impeller of centrifugal compressor

Abstract

The utility model relates to a sealing tool for an impeller of a centrifugal compressor, which comprises a round rod, the round rod comprises a cylindrical section and a threaded section which are coaxially connected, and a first chamfer is arranged between the cylindrical section and the threaded section; the tightening piece is provided with a threaded hole, the threaded hole is arranged to be a blind hole, the tightening piece is in threaded connection with the threaded section through the threaded hole, a second chamfer is arranged at the end of the threaded hole, and the oblique angle of the second chamfer is equal to the oblique angle of the first chamfer. The aged elastic sealing gasket is prevented from being mixed into phosphorus coating production, it is ensured that the elastic sealing gasket effectively seals the impeller, and therefore the production efficiency of the nickel-phosphorus coating of the impeller is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing tooling technology, and in particular to a sealing tooling for a centrifugal compressor impeller. Background Technology

[0002] To improve the corrosion resistance and impact resistance of centrifugal compressor impellers under exhaust gas recirculation conditions and extend their service life, a nickel-phosphorus alloy protective coating is typically formed on the impeller surface using chemical plating. In the production of this nickel-phosphorus coating, the head, tail, and central bore of the centrifugal compressor impeller are non-coated areas and require strict isolation from the coating solution to prevent corrosion and coating. Current methods involve stringing multiple impellers together by inserting a rod-shaped fixture through the impeller's central bore, sealing the impellers with elastic gaskets, and finally immersing the fixture and impellers in the coating solution tank to allow the nickel-phosphorus coating to adhere to the impeller surface.

[0003] However, elastic gaskets exposed to high-temperature acidic and alkaline environments gradually age, leading to a decrease in their hardness. Because elastic gaskets are reused and mixed with other materials, substandard gaskets with decreased hardness after repeated use, if introduced into production, may cause excessive deformation after tooling tightening, resulting in localized leakage. Alternatively, the gasket may cover areas beyond the design intent, causing corrosion and coating of the uncoated areas of the impeller by the coating solution, resulting in uncoated appearance defects at the head or tail. Therefore, timely detection and replacement of aged elastic gaskets during reuse and mixing is a key factor in improving the production efficiency of nickel-phosphorus coatings for impellers. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem in the prior art where aged elastic gaskets are mixed into the nickel-phosphorus coating production. Due to the excessive compression of the aged elastic gaskets, the coating solution enters the non-coated area of ​​the impeller from the gap between the impeller and the elastic gasket, causing corrosion and coating of the non-coated area of ​​the impeller by the coating solution. Therefore, this utility model provides a sealing fixture for the centrifugal compressor impeller, which can promptly detect and replace aged elastic gaskets, prevent aged elastic gaskets from being mixed into the phosphorus coating production and reused, ensure that the elastic gaskets effectively seal the impeller, and thus improve the production efficiency of nickel-phosphorus coating for the impeller.

[0005] To solve the above-mentioned technical problems, this utility model provides a sealing fixture for a centrifugal compressor impeller, comprising:

[0006] A round rod comprising a coaxially connected cylindrical segment and a threaded segment, wherein a first chamfer is provided between the cylindrical segment and the threaded segment;

[0007] A tightening component has a threaded hole, which is a blind hole. The tightening component is threadedly connected to the threaded segment through the threaded hole. The end of the threaded hole has a second chamfer, and the chamfer angle of the second chamfer is equal to that of the first chamfer.

[0008] In one embodiment of the present invention, the cylindrical segment is provided with a limiting base extending along its circumference on its circumferential side, and the limiting base and the cylindrical segment are integrally formed.

[0009] In one embodiment of this utility model, the limiting base is configured as a hexagonal prism, the hexagonal prism is coaxial with the cylindrical segment, and the cross-section of the hexagonal prism is larger than the cross-section of the cylindrical segment.

[0010] In one embodiment of this utility model, the limiting base is provided with a first hanging rod, the first hanging rod is coaxial with the cylindrical segment, and the first hanging rod and the cylindrical segment are located on two relatively far sides of the limiting base.

[0011] In one embodiment of this utility model, the round rod, the limiting base, and the tightening component are all made of metal.

[0012] In one embodiment of this utility model, the tightening member is configured as a hexagonal prism, the threaded hole extends along the axial direction of the hexagonal prism, and the cross-section of the hexagonal prism is larger than the cross-section of the cylindrical segment.

[0013] In one embodiment of the present invention, the diameter of the cylindrical segment is larger than the diameter of the threaded segment, and the end of the cylindrical segment is provided with the first chamfer.

[0014] In one embodiment of the present invention, the tightening member is provided with a second hanging rod, the second hanging rod is coaxial with the cylindrical section, and the second hanging rod is located on the side of the tightening member that is away from the cylindrical section.

[0015] In one embodiment of this utility model, the end of the threaded segment is configured as a hemispherical shape.

[0016] In one embodiment of the present invention, the threaded segment is provided with a clearance groove extending circumferentially thereon, the clearance groove being located between the cylindrical segment and the threaded segment.

[0017] In one embodiment of this utility model, the diameter of the cylindrical segment is equal to that of the first hanging rod.

[0018] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0019] The centrifugal compressor impeller sealing fixture of this utility model, after the impeller and elastic sealing gasket are fitted onto the cylindrical section, during the process of tightening the impeller and elastic sealing gasket by rotating the tightening component, the second chamfer approaches the first chamfer. When an aged elastic sealing gasket is mixed into the production, the compression of the aged sealing gasket increases under the same locking torque, causing the first and second chamfers to contact each other. This causes a sharp increase in the tightening torque of the tightening component, indicating to the operator that the elastic sealing gasket is unqualified and needs to be replaced, thereby avoiding leakage problems caused by the aging of the elastic sealing gasket. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the sealing fixture for the centrifugal compressor impeller in a preferred embodiment of the present invention;

[0022] Figure 2 for Figure 1 The exploded view of the sealing fixture of the centrifugal compressor impeller is shown as a structural schematic diagram.

[0023] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the sealing fixture for the centrifugal compressor impeller.

[0024] Figure 4 for Figure 3 A schematic diagram of the structure of the enlarged view at point A shown;

[0025] Figure 5 This is a partial structural diagram of the cylindrical and threaded sections of the centrifugal compressor impeller.

[0026] Explanation of the markings in the accompanying drawings: 1. Round rod; 2. Cylindrical section; 3. Threaded section; 4. First chamfer; 5. Tightening component; 6. Threaded hole; 7. Second chamfer; 8. Limiting base; 9. First hanging rod; 10. Second hanging rod; 11. Hemispherical; 12. Clearance groove. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example

[0028] Reference Figure 1 , Figure 2 and Figure 4As shown, in one embodiment of this utility model, a sealing fixture for a centrifugal compressor impeller is disclosed, which is used to seal the head, tail, and central hole of the impeller and immerse it in a coating solution bath for chemical alloy plating. The fixture includes...

[0029] A round rod 1 includes a cylindrical section 2 and a threaded section 3 connected coaxially, and a first chamfer 4 is provided between the cylindrical section 2 and the threaded section 3;

[0030] The tightening component 5 has a threaded hole 6, which is a blind hole. The tightening component 5 is threadedly connected to the threaded segment 3 through the threaded hole 6. The end of the threaded hole 6 has a second chamfer 7, and the chamfer angle of the second chamfer 7 is equal to the chamfer angle of the first chamfer 4.

[0031] The sealing fixture described in this embodiment, the assembly method of the impeller, elastic sealing gasket and tightening part 5 is as follows: first, use the cylindrical section 2 to string together an elastic sealing gasket, then string together a compressor impeller, then string together another elastic sealing gasket, and so on alternately until the number of compressor impellers on the cylindrical section 2 reaches the design number, and finally tighten the tightening part 5 to press the elastic sealing gasket tightly.

[0032] When the tightening component 5 is rotated, it moves toward the cylindrical section 2 and presses the elastic sealing gasket. After the elastic sealing gasket generates normal compression, it seals the head, tail, and central hole of the impeller. During the movement of the tightening component 5, the second chamfer 7 approaches the first chamfer 4 along the axial direction of the cylindrical section 2. If there is no aging of the elastic sealing section, the elastic sealing gasket generates normal compression. When the tightening component 5 is tightened to the preset torque, the second chamfer 7 will not contact the first chamfer 4. If there is aging of the elastic sealing gasket, under the same locking torque, the elastic sealing gasket generates excessive compression. The first chamfer 4 and the second chamfer 7 will contact each other, and at the moment of contact, the tightening torque of the tightening component 5 will increase sharply, indicating to the operator that the elastic sealing gasket is unqualified and needs to be replaced. This reduces the risk of the non-coated area of ​​the centrifugal compressor impeller being coated with chemicals due to the aging of the elastic sealing gasket. Furthermore, the blind hole can reduce the risk of coating chemicals seeping into the central hole of the impeller along the surface of the threaded section 3.

[0033] In one embodiment of this utility model, the diameter of the cylindrical segment 2 matches the diameter of the impeller's central hole, the cylindrical segment 2 just passes through the central hole of the impeller, and the length of the cylindrical segment 2 is equal to the total thickness of the impeller and the elastic sealing gasket to be suspended minus the total compression of the elastic sealing gasket.

[0034] In one embodiment of this utility model, the cylindrical section 2 can suspend four impellers.

[0035] In one embodiment of this utility model, the number of elastic sealing gaskets between the tightening member 5 and the impeller, between the impellers, and between the impeller and the limiting base 8 can be set to one or more.

[0036] In one embodiment of this utility model, the cross-section of the first chamfer 4 is a slanted straight line, and the cross-section of the second chamfer 7 is a slanted straight line. When the first chamfer 4 and the second chamfer 7 come into contact, the instantaneous increase in tightening torque becomes more significant, making it easier for the operator to clearly perceive the abnormality.

[0037] Reference Figure 2 As shown, the cylindrical segment 2 has a limiting base 8 extending circumferentially on its circumferential side. The limiting base 8 cooperates with the tightening member 5 to press the head and tail of the impeller from both ends respectively, preventing the impeller from loosening with the elastic sealing gasket. The limiting base 8 and the cylindrical segment 2 are integrally formed, which can prevent the coating solution from seeping through the gap between the limiting base 8 and the cylindrical segment 2. In another embodiment, the limiting base 8 is fitted onto the cylindrical segment 2 and then the two are welded together.

[0038] Reference Figure 2 As shown, the limiting base 8 is further configured as a hexagonal prism, which is coaxial with the cylindrical segment 2. During the tightening process of the tightening component 5, the limiting base 8 can be inserted into a pre-set tooling on the table that matches the limiting base 8, allowing for single-handed tightening of component 5. The cross-section of the hexagonal prism is larger than that of the cylindrical segment 2, and the end face of the hexagonal prism can be used to support the impeller.

[0039] Reference Figure 2 As shown, the limiting base 8 is provided with a first hanging rod 9. The first hanging rod 9 is coaxial with the cylindrical section 2, and the first hanging rod 9 and the cylindrical section 2 are located on two relatively far sides of the limiting base 8. The first hanging rod 9 is placed on the overall fixture as a suspension point at one end of the tooling so that the impeller can fully contact the coating solution. During the tightening process of the tightening part 5, the first hanging rod 9 can also be inserted into the tooling that is pre-set on the table and matches the first hanging rod 9, so that the part 5 can be tightened with one hand.

[0040] Furthermore, the limiting base 8, the cylindrical section 2, and the first hanging rod 9 are integrally machined or ground, which improves the overall structural strength of the rod.

[0041] Furthermore, in order to improve the sealing effect of the elastic sealing gasket, the round rod 1, the limiting base 8, and the tightening component 5 are all made of metal. Metal has good strength and rigidity and is not prone to deformation and displacement.

[0042] Furthermore, the metal materials are all made of 310 or 316 stainless steel. 310 and 316 stainless steel can withstand acid and alkali corrosion in the nickel-phosphorus coating process and also effectively extend the service life of the tooling.

[0043] Reference Figure 2As shown, the tightening component 5 is further configured as a hexagonal prism, and the threaded hole 6 extends along the axial direction of the hexagonal prism. The hexagonal prism can be tightened with a wrench, reducing the assembly difficulty of the tightening component 5. The cross-section of the hexagonal prism is larger than the cross-section of the cylindrical segment 2, and the end face of the hexagonal prism can be used to fully press the impeller and the elastic sealing gasket.

[0044] Reference Figure 3 As shown, the diameter of the cylindrical segment 2 is larger than the diameter of the threaded segment 3, and the end of the cylindrical segment 2 is provided with the first chamfer 4. Specifically, the first chamfer 4 is located at the edge of the end of the cylindrical segment 2. The first chamfer 4 extends from the threaded segment 3 to the cylindrical segment 2. Therefore, when the tightening member 5 and the threaded segment 3 are threadedly connected, the first chamfer 4 is aligned with the second chamfer 7 along the axial direction of the threaded segment 3. As the tightening member 5 is continuously tightened, the second chamfer 7 gradually approaches the first chamfer 4. When the cylindrical segment 2 passes through the central hole of the impeller, the first chamfer 4 can also prevent sharp right angles from scratching the central hole of the impeller.

[0045] Reference Figure 2 As shown, the tightening member 5 is further provided with a second hanging rod 10. The second hanging rod 10 is coaxial with the cylindrical section 2, and the second hanging rod 10 is located on the side of the tightening member 5 that is away from the cylindrical rod 1. The second hanging rod 10 is placed on the overall fixture as a suspension point at the other end of the tooling so that the impeller can fully contact the coating solution.

[0046] Furthermore, the tightening component 5 and the second hanging rod 10 are integrally formed.

[0047] Reference Figure 2 and Figure 5 As shown, the end of the threaded section 3 is further configured as a hemispherical shape 11. The function of the hemispherical shape 11 is to prevent the threaded section 3 from scratching the impeller hole when it is inserted into the impeller hole.

[0048] Reference Figure 4 As shown, the threaded segment 3 is further provided with a relief groove 12 extending circumferentially thereon. The relief groove 12 is located between the cylindrical segment 2 and the threaded segment 3. When the cutting tool is machining the threaded segment 3, the relief groove 12 can serve as a buffer space for the cutting tool to avoid interference between the cutting tool and the cylindrical segment 2, and can also prevent the inner corner of the second chamfer 7 from interfering with the end of the threaded segment 3.

[0049] Reference Figure 3 As shown, the cylindrical segment 2 has the same diameter as the first hanging rod 9.

[0050] The working principle of the sealing fixture for the centrifugal compressor impeller described in this utility model is as follows:

[0051] After sequentially mounting the four impellers onto the cylindrical section 2, place the elastic sealing gaskets between adjacent impellers, between the impeller and the limiting base 8, and between the impeller and the tightening component 5. Then, manually tighten the tightening component 5 onto the threaded section 3. After the tightening component 5 rotates, it presses the impeller and the elastic sealing gasket onto the limiting base 8. If the aged elastic sealing gasket is not mixed into the production process, under the same locking torque, the elastic sealing gasket will seal the head, tail, and central hole of the impeller with a small amount of deformation. The first chamfer 4 and the second chamfer 7 will not contact each other, and the tightening torque of the tightening component 5 will not change abruptly. If the aged elastic sealing gasket is mixed into the production process, under the same locking torque, the compression of the elastic sealing gasket will be too large, and the first chamfer 4 and the second chamfer 7 will contact each other. At this time, the tightening torque of the tightening component 5 will increase sharply, indicating to the operator that the elastic sealing gasket is unqualified. After the operator replaces the qualified elastic sealing gasket, the tightening component 5 is tightened again, and then the tooling and impeller are put into the coating solution tank.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A sealing tool for a centrifugal compressor impeller, characterized by, The utility model relates to a circular rod, which comprises a cylindrical segment and a threaded segment connected coaxially, a first chamfer is arranged between the cylindrical segment and the threaded segment; A tightening piece is provided with a threaded hole, the threaded hole is arranged as a blind hole, the threaded segment is threadedly connected with the threaded hole, an end of the threaded hole is provided with a second chamfer, and the chamfer angle of the second chamfer is equal to the chamfer angle of the first chamfer. The circumferential surface of the cylindrical segment is provided with a limiting base extending along the circumference thereof, and the limiting base and the cylindrical segment are integrally formed.

2. A seal tool for a centrifugal compressor impeller according to claim 1, wherein The limiting base is arranged as a hexagonal column, the hexagonal column is coaxial with the cylindrical segment, and the cross section of the hexagonal column is larger than the cross section of the cylindrical segment.

3. A sealing tool for a centrifugal compressor impeller according to claim 2, wherein The limiting base is provided with a first hanging rod, the first hanging rod is coaxial with the cylindrical segment, and the first hanging rod and the cylindrical segment are located on two sides of the limiting base far away from each other.

4. A seal tool for a centrifugal compressor impeller according to claim 2, wherein The circular rod, the limiting base and the tightening piece are all made of metal.

5. A seal tool for a centrifugal compressor impeller according to claim 2, wherein The tightening piece is arranged as a hexagonal column, the threaded hole extends along the axial direction of the hexagonal column, and the cross section of the hexagonal column is larger than the cross section of the cylindrical segment.

6. A sealing tool for a centrifugal compressor impeller according to claim 1, wherein The diameter of the cylindrical segment is larger than the diameter of the threaded segment, and the end of the cylindrical segment is provided with the first chamfer.

7. A sealing tool for a centrifugal compressor impeller according to claim 1, wherein The tightening piece is provided with a second hanging rod, the second hanging rod is coaxial with the cylindrical segment, and the second hanging rod is located on the side of the tightening piece far away from the circular rod.

8. A sealing tool for a centrifugal compressor impeller according to claim 1, wherein The end of the threaded segment is arranged as a hemispherical shape.

9. A sealing tool for a centrifugal compressor impeller according to claim 1, wherein The threaded segment is provided with an avoiding groove extending along the circumference thereof, and the avoiding groove is located between the cylindrical segment and the threaded segment.

10. A sealing tool for a centrifugal compressor impeller according to claim 1, wherein ​

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