Sealing structure of rotary compressor

Abstract

The invention relates to a rotary compressor sealing structure which comprises a silencing cover, a sealing shaft sleeve and a cylinder cover, the cylinder cover comprises a disc-shaped part and a cylinder cover boss arranged on the disc-shaped part, the end face of the cylinder cover boss is a cylinder cover end face, the sealing shaft sleeve is arranged on the outer wall of the cylinder cover boss in a sleeving mode, a silencing cover protruding ring protruding towards the interior of the silencing cover is arranged on the silencing cover, and the sealing shaft sleeve is arranged on the sealing shaft sleeve. The silencing cover convex ring abuts against the end face of the cylinder cover. After the sealing shaft sleeve is mounted, the shaft sleeve upper end face is higher than the cylinder cover end face; when the noise reduction cover is installed, the noise reduction cover convex ring is compacted on the end face of the cylinder cover, the sealing shaft sleeve higher than the end face of the cylinder cover is compressed and deformed to be attached to the curved surface of the periphery of the noise reduction cover convex ring, and the noise reduction cover convex ring and the cylinder cover boss are sealed in the sealing shaft sleeve. The upper part of the sealing shaft sleeve extends inwards or / and outwards to form an extension part, so that the upper end surface of the shaft sleeve is larger than the lower end surface of the shaft sleeve. Compared with the prior art, sealing between the cylinder cover and the silencing cover can be effectively strengthened, and meanwhile the cylinder cover has the advantages of being convenient to install and not prone to falling off and shifting.

Description

Technical Field

[0001] This invention belongs to the field of rotary compressor technology and relates to a rotary compressor sealing structure. Background Technology

[0002] like Figure 1 As shown, during operation, the rotary compressor discharges the compressed gas into the silencer P1, and finally discharges it through the through-hole in the pump body. Figure 1 As shown by the middle arrow (path S1), the sealing effect is not ideal because the cylinder head P2 and the muffler P1 are pressed together by the cylinder head end face P4 of the cylinder head boss P3 and the muffler ring P5 on the inner wall of the muffler P1.

[0003] On the one hand, when the compressed gas is expelled and enters the crankshaft through the poorly sealed cylinder head end face P4, Figure 1 As indicated by the middle arrow (path S2), bubbles are generated, which disrupts the establishment of the oil film, causing wear on the short shaft. The bursting of bubbles also makes the oil film uneven, thereby weakening the lubrication effect of the pump body and reducing reliability. On the other hand, the gas dissolves into the oil, reducing the amount of refrigerant participating in the circulation, thus leading to a decline in performance.

[0004] Patent CN103362816A discloses a rotary compressor, including a washer integrally formed from a planar ring and cylindrical ribs erected along the outer periphery of the ring. The ring of the washer is pressed against the entire surface of the lower boss end face of the lower bearing constituting the compression mechanism by a discharge muffler, and the ribs of the washer engage with the inner circumferential surface of the lower boss of the lower bearing. However, the function of the washer ribs in this patent is to fix the washer to the lower cylinder head boss, and the airtightness still mainly relies on the pressure between the muffler boss and the ring of the washer. The sealing effect of the ring of the washer, as a planar end face, pressing against the muffler boss is still not ideal.

[0005] Patent CN110319009A discloses a rotary compressor and its oil supply sealing structure. This oil supply sealing structure includes a cylinder head, a lower exhaust muffler cover, a tray, and a sealing gasket. The cylinder head has an annular boss with a limiting protrusion on its inner edge. The sealing gasket is fitted over the limiting protrusion, and the tray presses the sealing gasket against the annular boss. The lower exhaust muffler cover is fixedly connected to the cylinder head and presses against the tray. However, this patent, on the one hand, increases the number of components by including the sealing gasket and tray, increasing costs and improving installability; on the other hand, the increased number of components increases the number of contact pairs between parts, potentially leading to welding leaks and failing to fundamentally solve the airtightness problem; while the tray and oil suction pipe compress the sealing gasket (hard-soft) to solve the sealing problem, the contact point between the protrusion of the lower exhaust muffler cover and the tray creates a new contact pair (hard-hard), potentially creating new leakage points. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a rotary compressor sealing structure. This invention can effectively strengthen the seal between the cylinder head and the muffler, and has the advantages of convenient installation and being less prone to falling off or shifting.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a rotary compressor sealing structure, which includes a muffler, a sealing bushing, and a cylinder head.

[0009] The cylinder head includes a disc-shaped portion and a cylinder head boss disposed on the disc-shaped portion, the end face of which is configured as the cylinder head end face.

[0010] The sealing bushing is fitted onto the outer wall of the cylinder head boss. The end face of the sealing bushing away from the junction of the cylinder head boss and the disc-shaped part is designated as the upper end face of the bushing, and the end face closer to the junction is designated as the lower end face of the bushing.

[0011] The muffler is provided with a muffler ring that protrudes into the muffler and abuts against the cylinder head end face.

[0012] After the sealing bushing is installed, the upper end face of the bushing is higher than the end face of the cylinder head;

[0013] During the installation of the muffler, the muffler ring is pressed against the cylinder head end face, and the sealing bushing higher than the cylinder head end face is compressed and deformed to fit against the curved surface of the outer periphery of the muffler ring, sealing the muffler ring and the cylinder head boss inside.

[0014] The upper part of the sealing bushing extends inward and / or outward, such that the area of ​​the upper end face of the bushing is larger than the area of ​​the lower end face of the bushing, thereby enhancing the sealing effect.

[0015] Furthermore, the outer edge of the cylinder head end face is chamfered, and the sealing bushing extends inward according to the chamfering of the cylinder head end face. The upper part of the sealing bushing extends inward with an extension portion, which fits against the chamfer of the cylinder head end face to fill the assembly gap.

[0016] Furthermore, the extension includes two supporting sides, one of which is attached to the chamfer of the cylinder head end face, and the other supporting side is connected to the upper end face of the bushing.

[0017] Furthermore, the sealing bushing is machined with non-uniform diameter dimensions. In order to increase the sealing contact area, the upper end face of the bushing is reasonably enlarged. The upper part of the sealing bushing extends outward with an extension portion, so that when both the upper end face and the lower end face of the bushing are flat, the outer diameter of the upper end face of the bushing is larger than the outer diameter of the lower end face of the bushing.

[0018] As a preferred technical solution, the outer diameter of the sealing bushing increases linearly from the lower end face of the bushing to the upper end face of the bushing. The change relationship of the outer diameter of the sealing bushing can also be non-linear, such as decreasing first and then increasing, as long as the outer diameter of the upper end face of the bushing is greater than the outer diameter of the lower end face of the bushing.

[0019] Furthermore, the upper part of the sealing bushing can be machined to an angle that is not perpendicular to the axial direction (0° < θ < 90°) to form a trumpet shape. The extension extends away from the cylinder head boss and the junction of the cylinder head. The upper surface of the extension forms an obtuse angle with the cylinder head end face. When the muffler is installed, the folded flange can be pressed down, which also increases the sealing area.

[0020] Furthermore, the flared flange of the sealing bushing can be a non-complete circle, forming n uniform legs 24 (n≥2), and the extension includes several legs, which are circumferentially spaced.

[0021] As a preferred technical solution, the legs can be of different shapes, and the distribution of the legs can be uniformly symmetrical or non-uniformly symmetrical.

[0022] Furthermore, the inner wall of the sealing bushing is in the form of an inverted frustum, the inner diameter D1 of the upper end face of the bushing is smaller than the outer diameter d of the cylinder head boss (D1 < d), and the outer diameter d of the cylinder head boss is not greater than the inner diameter D2 of the lower end face of the bushing (d ≤ D2).

[0023] When the sealing bushing is assembled, since the inner diameter D1 of the upper end face of the bushing is smaller than the outer diameter d of the cylinder head boss (D1 < d), the cylinder head boss is pressed against the upper part of the sealing bushing, and the upper part of the sealing bushing undergoes compression deformation to fit against the outer wall of the cylinder head boss. The interference fit makes the upper part of the sealing bushing hold tightly, increasing the sealing effect.

[0024] Since the outer diameter d of the cylinder head boss is not greater than the inner diameter D2 of the lower end face of the bushing (d≤D2), the lower part of the sealing bushing is squeezed by the upper end face, filling the space between the lower part and the outer wall of the cylinder head boss. The deformation of the upper part of the sealing bushing during the assembly process forces the lower part of the sealing bushing to tighten, thereby increasing the sealing effect.

[0025] As a preferred technical solution, the material of the sealing bushing is selected from a soft material selected from rubber and silicone.

[0026] Furthermore, there is a gap between the lower end face of the bushing and the disc-shaped portion of the cylinder head.

[0027] Furthermore, there are other assembly and limiting processes between the sealing bushing and the cylinder head boss. The inner wall of the sealing bushing and the outer wall of the cylinder head boss are in a concave-convex fit. The inner wall of the sealing bushing is provided with one or more of the following: protrusions and grooves. The outer wall of the cylinder head boss is correspondingly provided with one or more of the following: grooves and protrusions.

[0028] Furthermore, the shape of the protrusion is selected from one or more of the following: protruding ring, protruding ridge, and protruding point; and the cross-sectional shape is selected from one or more of the following: semi-circular, square, and triangular.

[0029] As a preferred technical solution, the triangle is a right triangle, with one of the upper or lower sides of the protrusion being a right-angled side and the other being a hypotenuse.

[0030] As a preferred technical solution, the inner wall of the sealing bushing is spirally connected to the outer wall of the cylinder head boss.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The present invention adds a sealing bushing to the outside of the cylinder head boss to achieve a sealing effect;

[0033] (2) The sealing bushing of the present invention is radially fitted with the cylinder head boss to increase the sealing effect and prevent loosening;

[0034] (3) After the sealing bushing of the present invention is assembled with the cylinder head boss, the upper end face of the sealing bushing is slightly higher than the cylinder head end face of the cylinder head boss. When the muffler is installed, the upper end face of the bushing contacts the muffler and is squeezed. After the sealing bushing is assembled, the sealing effect is increased by increasing the sealing contact area.

[0035] (4) When the sealing bushing in this invention is correctly assembled, it can effectively strengthen the seal between the cylinder head and the muffler, avoid the problem of exhaust gas entering the pump body during operation to form bubbles, destroy the oil film and reduce reliability, and reduce the amount of refrigerant participating in the circulation by dissolving gas into the oil, thereby reducing performance; at the same time, it has the advantages of convenient installation and not easy to fall off or shift. Attached Figure Description

[0036] Figure 1 This is a schematic cross-sectional view of the rotary compressor sealing structure in the prior art of this invention;

[0037] Figure 2 This is an exploded structural diagram of the rotary compressor sealing structure in Embodiment 1 of the present invention;

[0038] Figure 3 This is a schematic cross-sectional view of the rotary compressor sealing structure in Embodiment 1 of the present invention;

[0039] Figure 4 This is a schematic diagram of the cross-sectional structure of the sealing bushing and cylinder head in Embodiment 2 of the present invention;

[0040] Figure 5 This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 2 of the present invention;

[0041] Figure 6 This is a schematic diagram of the cross-sectional structure of the sealing bushing and cylinder head in Embodiment 3 of the present invention;

[0042] Figure 7 This is a schematic diagram of the cross-sectional structure of the sealing bushing and cylinder head in Embodiment 4 of the present invention;

[0043] Figure 8 This is a top view of the sealing bushing and cylinder head in Embodiment 5 of the present invention;

[0044] Figure 9 This is a schematic diagram of the cross-sectional structure of the sealing bushing and cylinder head before assembly in Embodiment 6 of the present invention;

[0045] Figure 10 This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 7 of the present invention;

[0046] Figure 11 This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 8 of the present invention;

[0047] Figure 12 This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 9 of the present invention;

[0048] Figure 13This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 10 of the present invention;

[0049] Figure 14 This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 11 of the present invention;

[0050] Figure 15 This is an enlarged cross-sectional schematic diagram of the contact surface between the sealing bushing and the cylinder head in Embodiment 12 of the present invention.

[0051] Explanation of markings in the diagram:

[0052] P1—Muffler cover, P2—Lower cylinder head, P3—Cylinder head boss, P4—Cylinder head end face, P5—Muffler cover protrusion ring;

[0053] 1—Muffler cover, 11—Muffler cover protrusion ring, 2—Sealing bushing, 21—Upper end face of bushing, 22—Lower end face of bushing, 23—Support side, 24—Support foot, 3—Cylinder head, 31—Cylinder head boss, 32—Cylinder head end face. Detailed Implementation

[0054] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and do not imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Example 1:

[0058] A rotary compressor sealing structure, such as Figure 2 and Figure 3 As shown, it includes a muffler 1, a sealing bushing 2, and a cylinder head 3.

[0059] The cylinder head 3 includes a disc-shaped portion and a cylinder head boss 31 disposed on the disc-shaped portion. The end face of the cylinder head boss 31 is configured as a cylinder head end face 32.

[0060] The sealing bushing 2 is fitted onto the outer wall of the cylinder head boss 31. The end face of the sealing bushing 2 away from the junction of the cylinder head boss 31 and the disc-shaped part is designated as the upper end face 21 of the bushing, and the end face closer to the junction is designated as the lower end face 22 of the bushing.

[0061] The muffler 1 is provided with a muffler convex ring 11 that protrudes into the muffler 1, and the muffler convex ring 11 abuts against the cylinder head end face 32.

[0062] After the sealing bushing 2 is installed, the upper end face 21 of the bushing should be slightly higher than the cylinder head end face 32;

[0063] When the muffler 1 is installed, the muffler convex ring 11 is pressed against the cylinder head end face 32. The sealing bushing 2, which is higher than the cylinder head end face 32, will be compressed and deformed to fit against the curved surface of the outer periphery of the muffler convex ring 11, sealing the muffler convex ring 11 and the cylinder head boss 31 inside.

[0064] Examples 2 to 5:

[0065] A rotary compressor sealing structure is basically the same as that in Embodiment 1, except that the upper part of the sealing bushing 2 can also extend inward and / or outward, so that the area of ​​the upper end face 21 of the bushing is larger than the area of ​​the lower end face 22 of the bushing, so as to enhance the sealing effect.

[0066] The total height of the sealing bushing 2 can be less than the height of the cylinder head boss 31, that is, the lower end face 22 of the bushing can be spaced apart from the disc-shaped part of the cylinder head 3.

[0067] Example 2:

[0068] A rotary compressor sealing structure, such as Figure 4 and Figure 5 As shown, the outer edge of the cylinder head end face 32 is chamfered. The sealing bushing 2 can extend inward according to the chamfering of the cylinder head end face 32. That is, the upper part of the sealing bushing 2 extends inward and the extension fits into the chamfer of the cylinder head end face 32 to fill the assembly gap.

[0069] The extension includes two support edges 23, one of which is attached to the chamfer of the cylinder head end face 32, and the other support edge 23 is connected to the upper end face 21 of the bushing.

[0070] Example 3:

[0071] A rotary compressor sealing structure, such as Figure 6 As shown, the sealing bushing 2 can be machined with non-uniform diameter dimensions. In order to increase the sealing contact area, the upper end face 21 of the bushing can be reasonably enlarged, that is, the upper part of the sealing bushing 2 extends outward with an extension portion, so that when both the upper end face 21 and the lower end face 22 of the bushing are flat, the outer diameter of the upper end face 21 of the bushing is larger than the outer diameter of the lower end face 22 of the bushing, and the outer diameter of the sealing bushing 2 increases linearly from the lower end face 22 of the bushing to the upper end face 21 of the bushing.

[0072] The outer diameter of the sealing bushing 2 can also change non-linearly, for example, it can decrease first and then increase, as long as the outer diameter of the upper end face 21 of the bushing is greater than the outer diameter of the lower end face 22 of the bushing.

[0073] Example 4:

[0074] A rotary compressor sealing structure, such as Figure 7 As shown, the upper part of the sealing bushing 2 can be machined into an angle that is not perpendicular to the axial direction (0° < θ < 90°) to form a trumpet shape. That is, the upper part of the sealing bushing 2 extends outward with an extension. The extension extends away from the junction of the cylinder head boss 31 and the cylinder head 3. The upper surface of the extension forms an obtuse angle with the cylinder head end face 32. When the muffler 1 is installed, the folded flange can be pressed down, which also increases the sealing area.

[0075] Example 5:

[0076] A rotary compressor sealing structure, such as Figure 8 As shown, it is basically the same as in embodiment 4, except that the flared flange of the sealing bushing 2 can be a non-complete circle, forming n uniform legs 24 (n≥2), that is, the extension includes a number of legs 24, and the number of legs 24 are distributed circumferentially.

[0077] The legs 24 can be of different shapes, and the distribution of the legs 24 can also be non-uniform.

[0078] Example 6:

[0079] A rotary compressor sealing structure, such as Figure 9 As shown, it is basically the same as in Embodiment 1, except that the inner wall of the sealing bushing 2 can be machined into an inverted frustum shape, that is, the inner diameter D1 of the upper end face 21 of the bushing is smaller than the outer diameter d of the cylinder head boss 31, and the outer diameter d of the cylinder head boss 31 is not greater than the inner diameter D2 of the lower end face 22 of the bushing (D1<d≤D2).

[0080] The sealing bushing 2 can be made of soft materials such as rubber or silicone, and in this embodiment, rubber is preferred;

[0081] During the assembly of the sealing bushing 2, since the inner diameter D1 of the upper end face 21 of the bushing is smaller than the outer diameter d of the cylinder head boss 31 (D1 < d), the cylinder head boss 31 is pressed against the upper part of the sealing bushing 2, and the upper part of the sealing bushing 2 will undergo compression deformation to fit against the outer wall of the cylinder head boss 31. The interference fit makes the upper part of the sealing bushing 2 hold tightly, increasing the sealing effect.

[0082] Since the outer diameter d of the cylinder head boss 31 is not greater than the inner diameter D2 of the lower end face 22 of the bushing (d≤D2), the lower part of the sealing bushing 2 is squeezed by the upper end face, filling the space between the lower part and the outer wall of the cylinder head boss 31. The deformation of the upper part of the sealing bushing 2 during the assembly process forces the lower part of the sealing bushing 2 to tighten, thereby increasing the sealing effect.

[0083] Examples 7 to 12:

[0084] A rotary compressor sealing structure is basically the same as that in Embodiment 1, except that the sealing sleeve 2 should also have other assembly limiting processes with the cylinder head boss 31. There should be at least one limiting process between the inner wall of the sealing sleeve 2 and the outer wall of the cylinder head boss 31 for a concave-convex fit. The inner wall of the sealing sleeve 2 is provided with protrusions, grooves, etc., and the outer wall of the cylinder head boss 31 is correspondingly provided with grooves, protrusions, etc. The protrusions include protruding rings, protruding ridges, protruding points, etc., and the cross-sectional shape includes semi-circular, square, triangular, etc., to prevent the sealing sleeve 2 from shifting downwards during compressor operation after assembly, thereby losing the sealing effect.

[0085] Example 7:

[0086] A rotary compressor sealing structure, such as Figure 10 As shown, the inner wall of the sealing bushing 2 is provided with a protrusion, and the outer wall of the cylinder head boss 31 is provided with a corresponding groove. The protrusion is a raised ring, and the cross-sectional shape is a semi-circular shape.

[0087] Example 8:

[0088] A rotary compressor sealing structure, such as Figure 11 As shown, the inner wall of the sealing bushing 2 is provided with a protrusion, and the outer wall of the cylinder head boss 31 is provided with a corresponding groove. The protrusion is a raised ridge and the cross-sectional shape is square.

[0089] Example 9:

[0090] A rotary compressor sealing structure, such as Figure 12 As shown, the inner wall of the sealing bushing 2 is provided with a protrusion, and the outer wall of the cylinder head boss 31 is provided with a corresponding groove. The protrusion is a raised point, and the cross-sectional shape is a triangle. The triangle is a right triangle, with the lower side of the protrusion being a right-angled side and the upper side being a hypotenuse.

[0091] Example 10:

[0092] A rotary compressor sealing structure, such as Figure 13 As shown, the inner wall of the sealing bushing 2 is provided with a groove, and the outer wall of the cylinder head boss 31 is provided with a corresponding protrusion. The protrusion is a raised ring in shape and a semi-circular cross-section.

[0093] Example 11:

[0094] A rotary compressor sealing structure, such as Figure 14 As shown, the inner wall of the sealing bushing 2 is provided with a groove, and the outer wall of the cylinder head boss 31 is provided with a corresponding protrusion. The protrusion is shaped as a ridge and has a square cross-section.

[0095] Example 12:

[0096] A rotary compressor sealing structure, such as Figure 15 As shown, the inner wall of the sealing bushing 2 is provided with a groove, and the outer wall of the cylinder head boss 31 is provided with a corresponding protrusion. The protrusion is a raised dot, and the cross-sectional shape is a triangle. The triangle is a right triangle, with the upper side of the protrusion being a right-angled side and the lower side being a hypotenuse.

[0097] Example 13:

[0098] A rotary compressor sealing structure is basically the same as that in Embodiment 1, except that the inner wall of the sealing bushing 2 is spirally connected to the outer wall of the cylinder head boss 31.

[0099] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A rotary compressor sealing structure, characterized in that, The structure includes a muffler (1), a sealing bushing (2), and a cylinder head (3). The cylinder head (3) includes a disc-shaped portion and a cylinder head boss (31) provided on the disc-shaped portion. The end face of the cylinder head boss (31) is configured as a cylinder head end face (32). The sealing bushing (2) is fitted onto the outer wall of the cylinder head boss (31). The end face of the sealing bushing (2) away from the junction of the cylinder head boss (31) and the disc-shaped part is designated as the upper end face (21) of the bushing, and the end face near the junction is designated as the lower end face (22) of the bushing. The muffler (1) is provided with a muffler ring (11) that protrudes into the muffler (1) and the muffler ring (11) abuts against the cylinder head end face (32); After the sealing bushing (2) is installed, the upper end face (21) of the bushing is higher than the cylinder head end face (32); When the muffler (1) is installed, the muffler convex ring (11) is pressed onto the cylinder head end face (32), and the sealing bushing (2) which is higher than the cylinder head end face (32) is compressed and deformed to fit against the curved surface of the outer periphery of the muffler convex ring (11), sealing the muffler convex ring (11) and the cylinder head boss (31) inside; The upper part of the sealing bushing (2) extends inward and / or outward, such that the area of ​​the upper end face (21) of the bushing is greater than the area of ​​the lower end face (22) of the bushing.

2. The rotary compressor sealing structure according to claim 1, characterized in that, The outer edge of the cylinder head end face (32) is chamfered, and the upper part of the sealing bushing (2) extends inward with an extension portion that fits into the chamfer of the cylinder head end face (32).

3. The rotary compressor sealing structure according to claim 2, characterized in that, The extension includes two supports (23), one of which is attached to the chamfer of the cylinder head end face (32), and the other support (23) is connected to the upper end face (21) of the bushing.

4. The rotary compressor sealing structure according to claim 1, characterized in that, The upper part of the sealing bushing (2) extends outward, and the outer diameter of the upper end face (21) of the bushing is larger than the outer diameter of the lower end face (22) of the bushing.

5. The rotary compressor sealing structure according to claim 4, characterized in that, The upper surface of the extension forms an obtuse angle with the cylinder head end face (32).

6. The rotary compressor sealing structure according to claim 5, characterized in that, The extension includes a plurality of legs (24) which are circumferentially spaced.

7. A rotary compressor sealing structure according to any one of claims 1 to 6, characterized in that, The inner wall of the sealing bushing (2) is in the form of an inverted frustum. The inner diameter of the upper end face (21) of the bushing is smaller than the outer diameter of the cylinder head boss (31), and the outer diameter of the cylinder head boss (31) is not greater than the inner diameter of the lower end face (22) of the bushing.

8. A rotary compressor sealing structure according to any one of claims 1 to 6, characterized in that, There is a gap between the lower end face (22) of the bushing and the disc-shaped part of the cylinder head (3).

9. A rotary compressor sealing structure according to any one of claims 1 to 6, characterized in that, The inner wall of the sealing bushing (2) and the outer wall of the cylinder head boss (31) are in a concave-convex fit. The inner wall of the sealing bushing (2) is provided with one or more of the following: protrusions and grooves. The outer wall of the cylinder head boss (31) is correspondingly provided with one or more of the following: grooves and protrusions.

10. A rotary compressor sealing structure according to claim 9, characterized in that, The shape of the protrusion is selected from one or more of the following: protruding ring, protruding ridge, and protruding dot; the cross-sectional shape is selected from one or more of the following: semi-circular, square, and triangular.

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