Sealing structure of elliptical rotor compressor

Abstract

The utility model discloses a sealing structure of an oval rotor compressor. The sealing structure comprises a cylinder body, the cylinder covers are respectively fixed on two end surfaces of the cylinder body; the elliptical rotor is movably mounted in the cylinder body; the shaft seal assemblies are embedded in the two end faces of the oval rotor respectively. An end face shaft seal adopts triple combination of a metal sealing strip, a non-metal sealing strip and a rubber strip, a spring pre-tightening structure is combined, dynamic compensation sealing is formed on the end face of a rotor, floating self-adaption is achieved through an omega-shaped groove of a radial sealing assembly and a columnar sealing strip, a first spring piece provides radial constant pressure, and the first spring piece is matched with a trapezoidal sealing strip and a second spring piece to block backlash leakage. A V-shaped corner seal of the corner seal assembly is pre-tightened through a second spring, the outer side face of the V-shaped corner seal is tangent to the molded line of the shaft seal assembly, the inner side face of the V-shaped corner seal is tangent to the molded line of the rotor, a triangular leakage area at the intersection of the cylinder body, the cylinder cover and the rotor is completely sealed, and the global sealing structure adapts to elliptic track changes through an elastic element, reduces the abrasion rate and reduces the leakage rate.

Description

Technical Field

[0001] This utility model relates to the field of rotary compressor technology, and in particular to a sealing structure for an elliptical rotary compressor. Background Technology

[0002] Rotary compressors achieve high-frequency gas compression by driving a rotor to rotate using an engine or electric motor. Their sealing performance directly affects compression efficiency and lifespan. While the sealing structure of traditional circular rotor compressors is relatively mature, elliptical rotors, due to their large curvature variations, are prone to dynamic leakage gaps between the sealing strips and the cylinder block / cylinder head during high-speed rotation. Currently, in elliptical rotor compressors, the triangular area formed between the axial seal on the end face of the elliptical rotor and the radial seal of the cylinder block contains a sealing blind zone. Axial seals experience severe wear, and the radial sealing strips are prone to uneven wear under centrifugal force (rotor-directing tangential force). Furthermore, conventional sealing structures struggle to adapt to the continuous deformation of the elliptical profile (difficult to adapt to dynamic changes in the sealing profile and spatial position), leading to increased leakage paths, increased wear, and decreased energy efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a sealing structure for an elliptical rotor compressor to solve the problems mentioned in the background art.

[0004] A sealing structure for an elliptical rotor compressor includes:

[0005] Cylinder block;

[0006] Cylinder heads are fixed to both ends of the cylinder block;

[0007] An elliptical rotor that is mounted inside the cylinder body;

[0008] Shaft seal assemblies are respectively embedded and installed on both ends of the elliptical rotor;

[0009] Radial sealing assemblies are respectively embedded and installed in a triangular shape on the inner wall of the cylinder.

[0010] And corner seal assemblies located at both ends of the radial sealing assembly, the corner seal assemblies being embedded in the cylinder head.

[0011] Preferably, the two end faces of the elliptical rotor are provided with multiple elliptical sealing grooves, the cross-section of the sealing grooves is trapezoidal, and multiple spring grooves are provided at equal intervals at the bottom of the sealing grooves, with spring guide posts fixed to the bottom of the spring grooves.

[0012] Preferably, the shaft seal assembly includes a metal sealing strip, a non-metallic sealing strip, and a rubber strip. The metal sealing strip is embedded inside a sealing groove. The non-metallic sealing strip is in close contact with the end of the metal sealing strip away from the sealing groove. The rubber strip is embedded between the non-metallic sealing strip and the metal sealing strip. The metal sealing strip, the non-metallic sealing strip, and the rubber strip are provided with coaxial through mounting holes for fasteners to pass through and fix the three together. The surface of the non-metallic sealing strip is provided with multiple grooves. The cross-section of the shaft seal assembly is trapezoidal.

[0013] Preferably, the metal sealing strip has multiple spring grooves three near the sealing groove end, and a spring guide post three is fixed to the bottom of the spring groove three. The spring groove three corresponds one-to-one with the spring groove two. A spring one is connected between the spring groove three and the spring groove two. The spring one is located outside the spring guide post three and the spring guide post two.

[0014] Preferably, the radial sealing assembly includes a slider, a cylindrical sealing strip, a spring limiting platform, and a spring plate. The inner end face of the slider has an Ω-groove, and the cylindrical sealing strip is movably disposed inside the Ω-groove. The groove width of the Ω-groove is smaller than the diameter of the cylindrical sealing strip, and the inner diameter of the Ω-groove is larger than the diameter of the cylindrical sealing strip.

[0015] Preferably, the spring limiting platform is fixed on both sides of the outer end of the slider, and the spring sheet is fixed in an arc shape between the spring limiting platforms.

[0016] Preferably, the inner end face of the slider has two symmetrical grooves on both sides of the Ω groove. A trapezoidal sealing strip is inserted into each groove. An arc-shaped spring sheet is fixed to the outer end of the trapezoidal sealing strip. The spring sheet is connected to the bottom of the groove.

[0017] Preferably, the cylinder head has a V-shaped corner seal groove at one end near the cylinder body, and spring grooves are formed on both sides of the bottom of the V-shaped corner seal groove, with a spring guide post fixed to the bottom of the spring groove.

[0018] Preferably, the corner seal assembly includes a V-shaped corner seal and four spring guide posts. The V-shaped corner seal is inserted into the V-shaped corner seal groove. The V-shaped corner seal is composed of a metal V-shaped sealing strip, a non-metallic V-shaped sealing strip, and a V-shaped rubber strip. The non-metallic V-shaped sealing strip is fixed at the end of the metal V-shaped sealing strip away from the V-shaped corner seal groove. The V-shaped rubber strip is embedded between the non-metallic V-shaped sealing strip and the metal V-shaped sealing strip. There is a pair of four spring guide posts, which are respectively fixed on both sides of the metal V-shaped sealing strip. The four spring guide posts correspond one-to-one with the one spring guide post. A second spring connects the metal V-shaped sealing strip and the spring groove. The second spring is located outside the four spring guide posts and the one spring guide post.

[0019] Preferably, the outer surface of the V-shaped corner seal is tangent to the profile of the shaft seal assembly, and the inner surface of the V-shaped corner seal is tangent to the profile of the elliptical rotor.

[0020] The beneficial effects of this utility model are as follows: The sealing structure of this elliptical rotor compressor significantly improves sealing efficiency through a multi-layer synergistic sealing design. The end face shaft seal adopts a triple combination of metal sealing strips, non-metallic sealing strips, and rubber strips, combined with a spring preload structure, to form a dynamic compensation seal on the rotor end face. The Ω groove of the radial sealing assembly and the cylindrical sealing strip achieve floating self-adaptation. Spring plate one provides radial constant pressure, which, together with the trapezoidal sealing strip and spring plate two, blocks side clearance leakage. The V-shaped corner seal of the corner seal assembly is preloaded by spring two, with its outer side tangent to the profile of the shaft seal assembly and its inner side tangent to the profile of the rotor, completely sealing the triangular leakage area at the junction of the cylinder block, cylinder head, and rotor. The full-area sealing structure adapts to changes in the elliptical trajectory through elastic elements, reducing wear rate and leakage, and is suitable for high-speed variable operating conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0022] Figure 2 This is a schematic diagram of the entire assembly disassembled.

[0023] Figure 3 This is a schematic diagram showing the disassembly of the elliptical rotor and shaft seal assembly of this utility model.

[0024] Figure 4 This is a schematic diagram of the shaft seal assembly of this utility model after disassembly.

[0025] Figure 5 This is a schematic diagram of the cylinder head of this utility model.

[0026] Figure 6 This is a schematic diagram of the radial sealing assembly and the corner sealing assembly of this utility model.

[0027] Figure 7 This is a schematic diagram showing the disassembly of the trapezoidal sealing strip and the slider of this utility model.

[0028] Figure 8 This is a partial cross-sectional schematic diagram of the elliptical rotor of this utility model.

[0029] In the diagram: 1. Cylinder block; 2. Cylinder head; 21. V-shaped corner seal groove; 22. Spring groove one; 23. Spring guide post one; 3. Elliptical rotor; 31. Sealing groove; 32. Spring groove two; 33. Spring guide post two; 4. Shaft seal assembly; 41. Metal sealing strip; 411. Spring groove three; 412. Spring guide post three; 42. Non-metallic sealing strip; 43. Rubber strip; 5. Radial sealing assembly; 51. Slider; 52. Columnar sealing strip; 53. Spring limiting platform; 54. Spring plate one; 55. Groove; 56. Trapezoidal sealing strip; 57. Spring plate two; 6. Corner seal assembly; 61. V-shaped corner seal; 62. Spring guide post four. Detailed Implementation

[0030] like Figures 1-8 As shown, a sealing structure for an elliptical rotor compressor includes:

[0031] Cylinder block 1;

[0032] Cylinder heads 2 are fixed to both ends of cylinder body 1. A V-shaped corner sealing groove 21 is opened at one end of cylinder head 2 near cylinder body 1. Spring grooves 22 are opened on both sides of the bottom of the V-shaped corner sealing groove 21. Spring guide posts 23 are fixed at the bottom of the spring grooves 22.

[0033] An elliptical rotor 3 is installed inside the cylinder body 1. Multiple elliptical sealing grooves 31 are opened on both ends of the elliptical rotor 3. The cross-section of the sealing groove 31 is trapezoidal. Multiple spring grooves 32 are opened at equal intervals on the bottom of the sealing groove 31. Spring guide posts 33 are fixed to the bottom of the spring grooves 32.

[0034] Shaft seal assemblies 4 are respectively embedded and installed on both ends of the elliptical rotor 3. The cross-section of the shaft seal assembly 4 is trapezoidal. The shaft seal assembly 4 includes a metal sealing strip 41, a non-metallic sealing strip 42, and a rubber strip 43. The metal sealing strip 41 is embedded inside the sealing groove 31. The non-metallic sealing strip 42 is tightly attached to the end of the metal sealing strip 41 away from the sealing groove 31. The rubber strip 43 is embedded between the non-metallic sealing strip 42 and the metal sealing strip 41. The metal sealing strip 41, non-metallic sealing strip 42, and rubber strip 43 are provided with coaxial through mounting holes 45 for fasteners to pass through and fix the three together. The surface of the non-metallic sealing strip 42 is provided with multiple grooves. The end of the metal sealing strip 41 near the sealing groove 31 has multiple spring grooves 411. Spring guide posts 412 are fixed to the bottom of the spring grooves 411. Spring 411 corresponds one-to-one with spring groove 32. Spring 411 and spring groove 32 are connected by spring 1. Spring 1 is located outside spring guide post 312 and spring guide post 33. Metal sealing strip 41, non-metallic sealing strip 42 and rubber strip 43 are first installed by fasteners through mounting holes 45 to form shaft seal assembly 4. Then the entire shaft seal assembly 4 is installed into the sealing groove 31 of the elliptical rotor 3, so that spring 1 is located outside spring guide post 312 and spring guide post 33. In this way, metal sealing strip 41 bears the main wear, non-metallic sealing strip 42 maintains oil film lubrication through the oil reservoir on the surface, rubber strip 43 transmits pressure and compensates for deformation, and spring 1 44 is pre-tightened in both directions (spring guide post 2 33 on the rotor side and spring guide post 312 on the sealing strip side) to achieve dynamic pressing of the cylinder head 2 end face and eliminate axial leakage.

[0035] Radial sealing components 5 are respectively embedded in the triangular shape on the inner wall of cylinder 1. Each radial sealing component 5 includes a slider 51, a cylindrical sealing strip 52, a spring limiting platform 53, and a spring plate 54. The inner end face of the slider 51 has an Ω-shaped groove. The cylindrical sealing strip 52 is movably disposed inside the Ω-shaped groove. The width of the Ω-shaped groove opening is smaller than the diameter of the cylindrical sealing strip 52, and the inner diameter of the Ω-shaped groove is larger than the diameter of the cylindrical sealing strip 52. The spring limiting platform 53 is fixed to both sides of the outer end of the slider 51. The spring plate 54 is fixed in an arc shape between the spring limiting platforms 53. Two grooves 55 are symmetrically formed on the inner end face of the slider 51 on both sides of the Ω-shaped groove. Trapezoidal sealing strips are inserted into each groove 55. 56. An arc-shaped spring sheet 57 is fixed to the outer end of the trapezoidal sealing strip 56. The spring sheet 57 is connected to the bottom of the groove 55. By setting the columnar sealing strip 52 inside the Ω groove of the slider 51 and then symmetrically setting the trapezoidal sealing strip 56 inside the two grooves 55, the Ω groove structure prevents the columnar sealing strip 52 from coming out by limiting the groove opening. The groove cavity space allows it to float radially to adapt to the elliptical trajectory of the rotor. The spring sheet 54 applies a constant radial force to the slider 51, pushing the columnar sealing strip 52 to fit tightly against the elliptical rotor 3. Under the action of the spring sheet 57, the trapezoidal sealing strip 56 fits the elliptical rotor 3 at an angle. The spring sheet 57 can be directly fixed to the bottom of the groove 55.

[0036] And corner sealing assemblies 6 located at both ends of the radial sealing assembly 5. The corner sealing assembly 6 is embedded in the cylinder head 2. The corner sealing assembly 6 includes a V-shaped corner seal 61 and a spring guide post 62. The V-shaped corner seal 61 is inserted into the V-shaped corner seal groove 21. The V-shaped corner seal 61 is composed of a metal V-shaped sealing strip, a non-metallic V-shaped sealing strip, and a V-shaped rubber strip. The non-metallic V-shaped sealing strip is fixed at the end of the metal V-shaped sealing strip away from the V-shaped corner seal groove 21. The V-shaped rubber strip is embedded between the non-metallic V-shaped sealing strip and the metal V-shaped sealing strip. The spring guide post 62 has a The spring guide post 62 and spring guide post 23 are respectively fixed on both sides of the metal V-shaped sealing strip. The spring guide post 62 corresponds to the spring guide post 23. A spring 2 is connected between the metal V-shaped sealing strip and the spring groove 22. The spring 2 is located outside the spring guide post 62 and the spring guide post 23. The outer side of the V-shaped corner seal 61 is tangent to the profile of the shaft seal assembly 4. The inner side of the V-shaped corner seal 61 is tangent to the profile of the elliptical rotor 3. The V-shaped corner seal 61 is installed inside the V-shaped corner seal groove 21 of the cylinder head 2, and the spring guide post 62 and spring guide post 23 are located at the spring 2. Inside, spring two is guided by spring guide post four 62 and spring guide post one 23, providing precise axial preload to the V-shaped corner seal 61. Its outer side is tangent to the profile of the cylindrical sealing strip 52, and its inner side is tangent to the profile of the elliptical rotor 3, dynamically sealing the triangular leakage area at the intersection of the radial sealing strip end and the elliptical rotor 3-cylinder head 2, achieving full-area sealing without dead angles. This multi-layer synergistic sealing design significantly improves sealing efficiency. The end face shaft seal adopts a triple combination of metal sealing strip 41, non-metallic sealing strip 42, and rubber strip 43, combined with the spring preload structure, forming a dynamic compensation seal on the rotor end face. The radial sealing assembly 5 has an Ω groove that floats and adapts to the cylindrical sealing strip 52. The spring plate 54 provides constant radial pressure, which, together with the trapezoidal sealing strip 56 and the spring plate 57, blocks side clearance leakage. The V-shaped corner seal 61 of the corner seal assembly 6 is pre-tightened by the spring plate 2. Its outer side is tangent to the profile of the shaft seal assembly 4 and its inner side is tangent to the profile of the elliptical rotor 3, completely sealing the triangular leakage area at the intersection of the cylinder block 1, cylinder head 2 and elliptical rotor 3. The full-area sealing structure adapts to the change of elliptical trajectory through elastic elements, reducing wear rate and effectively suppressing leakage. It is suitable for high-speed variable operating conditions.

[0037] Furthermore, this sealing structure is not only applicable to rotary compressors, but also to rotary engines. If a rotary engine adopts this sealing structure, it is also within the protection scope of this utility model.

Claims

1. A sealing structure for an elliptical rotor compressor, characterized in that, include: Cylinder block (1); Cylinder caps (2) are fixed to both ends of the cylinder body (1); An elliptical rotor (3) is mounted inside the cylinder (1); Shaft seal assemblies (4) are respectively embedded and installed on both ends of the elliptical rotor (3); Radial sealing components (5) are respectively embedded in the triangular inner wall of the cylinder (1); And corner seal assemblies (6) located at both ends of the radial sealing assembly (5), the corner seal assemblies (6) being embedded in the cylinder head (2).

2. The sealing structure of an elliptical rotor compressor according to claim 1, characterized in that: The elliptical rotor (3) has multiple elliptical sealing grooves (31) on both ends. The cross-section of the sealing groove (31) is trapezoidal. Multiple spring grooves (32) are equally spaced at the bottom of the sealing groove (31). Spring guide posts (33) are fixed at the bottom of the spring grooves (32).

3. The sealing structure of an elliptical rotor compressor according to claim 2, characterized in that: The shaft seal assembly (4) includes a metal sealing strip (41), a non-metallic sealing strip (42), and a rubber strip (43). The metal sealing strip (41) is embedded inside the sealing groove (31). The non-metallic sealing strip (42) is close to the end of the metal sealing strip (41) away from the sealing groove (31). The rubber strip (43) is embedded between the non-metallic sealing strip (42) and the metal sealing strip (41). The metal sealing strip (41), the non-metallic sealing strip (42), and the rubber strip (43) are provided with coaxial through mounting holes (45) for fasteners to pass through to fix the three together. The surface of the non-metallic sealing strip (42) is provided with multiple grooves. The cross-section of the shaft seal assembly (4) is trapezoidal.

4. The sealing structure of an elliptical rotor compressor according to claim 3, characterized in that: The metal sealing strip (41) has multiple spring grooves (411) at one end near the sealing groove (31). Spring guide post (412) is fixed at the bottom of the spring groove (411). The spring groove (411) corresponds to the spring groove (32) one by one. A spring is connected between the spring groove (411) and the spring groove (32). The spring is located outside the spring guide post (412) and the spring guide post (33).

5. The sealing structure of an elliptical rotor compressor according to claim 1, characterized in that: The radial sealing assembly (5) includes a slider (51), a cylindrical sealing strip (52), a spring limiting platform (53), and a spring plate (54). The inner end face of the slider (51) has an Ω groove. The cylindrical sealing strip (52) is movably disposed inside the Ω groove. The groove width of the Ω groove is smaller than the diameter of the cylindrical sealing strip (52), and the inner diameter of the Ω groove is larger than the diameter of the cylindrical sealing strip (52).

6. The sealing structure of an elliptical rotor compressor according to claim 5, characterized in that: The spring limiting platform (53) is fixed on both sides of the outer end of the slider (51), and the spring sheet (54) is fixed in an arc shape between the spring limiting platforms (53).

7. The sealing structure of an elliptical rotor compressor according to claim 6, characterized in that: The inner end face of the slider (51) has two symmetrical grooves (55) on both sides of the Ω groove. A trapezoidal sealing strip (56) is inserted into each groove (55). An arc-shaped spring sheet (57) is fixed to the outer end of the trapezoidal sealing strip (56). The spring sheet (57) is connected to the bottom of the groove (55).

8. The sealing structure of an elliptical rotor compressor according to claim 1, characterized in that: The cylinder head (2) has a V-shaped corner seal groove (21) at one end near the cylinder body (1). The bottom of the V-shaped corner seal groove (21) has a spring groove (22) on both sides. The bottom of the spring groove (22) is fixed with a spring guide post (23).

9. The sealing structure of an elliptical rotor compressor according to claim 8, characterized in that: The corner seal assembly (6) includes a V-shaped corner seal (61) and four spring guide posts (62). The V-shaped corner seal (61) is inserted into the V-shaped corner seal groove (21). The V-shaped corner seal (61) is composed of a metal V-shaped sealing strip, a non-metallic V-shaped sealing strip and a V-shaped rubber strip. The non-metallic V-shaped sealing strip is fixed at the end of the metal V-shaped sealing strip away from the V-shaped corner seal groove (21). The V-shaped rubber strip is embedded between the non-metallic V-shaped sealing strip and the metal V-shaped sealing strip. There is a pair of four spring guide posts (62) and they are fixed on both sides of the metal V-shaped sealing strip. The four spring guide posts (62) correspond one-to-one with the first spring guide post (23). A second spring is connected between the metal V-shaped sealing strip and the first spring groove (22). The second spring is located outside the four spring guide posts (62) and the first spring guide post (23).

10. The sealing structure of an elliptical rotor compressor according to claim 9, characterized in that: The outer side of the V-shaped corner seal (61) is tangent to the profile of the shaft seal assembly (4), and the inner side of the V-shaped corner seal (61) is tangent to the profile of the elliptical rotor (3).

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