Rotary compressor lubrication system and rotary compressor

Abstract

The present invention relates to a lubrication system for a rotary compressor, which includes a compressor cylinder, a compressor roller, a sliding vane, a cylinder head and a ball; a relief groove is provided on the cylinder wall of the compressor cylinder; a lubricating oil hole is provided on the cylinder head, and the lubricating oil hole includes a first hole cavity and a second hole cavity. The projection of the first hole cavity in the second hole cavity falls within the second hole cavity. The ball is arranged in the second hole cavity and outside the first hole cavity. The surface of the ball is tangent to the opening edge of the first hole cavity facing the second hole cavity; the opening of the second hole cavity is located on the joint surface of the compressor cylinder and the cylinder head, and a part of the opening of the second hole cavity is blocked by the compressor cylinder. In the lubrication system for the rotary compressor provided by the present invention, a movable ball is arranged in the lubricating oil hole to realize the sealing and opening of the space of the relief groove. On the one hand, it can prevent the refrigerant entering the relief groove from leaking into the housing along the lubricating oil hole, and on the other hand, it can timely supplement lubricating oil into the relief groove through the lubricating oil hole.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment, and particularly to a lubrication system for a rotary compressor and a rotary compressor. Background Art

[0002] A compressor is a key component in refrigeration equipment. With the continuous improvement of energy conservation and environmental protection requirements, there are demands for the compressor to be small in size, energy-saving and power-saving, while maintaining high refrigeration efficiency. Among compressors, a rotary compressor is driven by an engine or a motor. Particularly, in a sliding vane rotary compressor, the compressor roller rolls along the cylinder wall, the sliding vane is integrated with the compressor roller, and the sliding vane swings back and forth between the rocking vanes, relying on the oil film formed by the lubricating oil between the moving parts for sealing. When the motor drives the crankshaft to move, it will cause the volume change of the cavity formed by the outer ring of the compressor roller, the cylinder bore and the sliding vane, etc., to complete the intake and exhaust processes.

[0003] In a sliding vane rotary compressor, a working cavity with a special shape is formed between the rotor, the sliding vane and the cylinder. During the compression process of the refrigerant, there is inevitably a problem of continuous leakage of the refrigerant into the working cavity, which will lead to a reduction in the dosage of the refrigerant flowing in the compressor as a whole, and further lead to an increase in the input power and a decrease in the refrigeration efficiency. In addition, since the sliding vane continuously slides relative to the cylinder, it is necessary to provide good lubrication for the sliding vane. However, both the refrigerant and the lubricating oil are usually fluids. When allowing the lubricating oil to enter the working cavity, the refrigerant is also likely to enter, resulting in refrigerant leakage. Summary of the Invention

[0004] Based on this, it is necessary to provide a lubrication system for a rotary compressor and a rotary compressor in view of at least one of the above-mentioned problems.

[0005] In a first aspect, the present application provides a lubrication system for a rotary compressor, including a compressor cylinder, a compressor roller, a sliding vane, a cylinder head and a ball;

[0006] The sliding vane is detachably connected to the compressor roller of the rotary compressor, a relief groove is provided on the cylinder wall of the compressor cylinder, and the sliding vane can move periodically in the relief groove;

[0007] The compressor cylinder is attached and connected to the cylinder head, a lubricating oil hole is provided on the cylinder head, the lubricating oil hole includes a first hole cavity and a second hole cavity, the projection of the first hole cavity in the second hole cavity falls within the second hole cavity, the ball is arranged in the second hole cavity and outside the first hole cavity, and the surface of the ball is tangent to the opening edge of the first hole cavity facing the second hole cavity;

[0008] The opening of the second cavity is located on the joint surface of the compressor cylinder and the cylinder head, and is located within the relief groove. The compressor cylinder shields a part of the opening of the second cavity.

[0009] In certain implementations of the first aspect, the cross-sectional shape of the lubricating oil hole along the hole axis is funnel-shaped, the first cavity is cylindrical, and the second cavity is frustum-shaped.

[0010] Combining the first aspect and the above implementations, in certain implementations of the first aspect, the compressor cylinder shields one-half of the opening of the second cavity; the diameter of the ball is greater than the cross-sectional diameter of the upper edge of the first cavity in the radial direction, and the diameter of the ball is less than the cross-sectional diameter of the upper edge of the second cavity in the radial direction.

[0011] Combining the first aspect and the above implementations, in certain implementations of the first aspect, the relief groove includes a first groove body and a second groove body. The first groove body is close to the cylinder wall of the compressor cylinder. The second groove body communicates with the first groove body. The relief groove forms a symmetric constriction neck at the connection of the first groove body and the second groove body.

[0012] Combining the first aspect and the above implementations, in certain implementations of the first aspect, the sliding vane further includes a swinging sliding vane; the first groove body includes a curved inner wall; the swinging sliding vane is arranged within the first groove body and on both sides of the sliding vane; the cross-sectional shape of the second groove body is the movement trajectory of the free end of the sliding vane.

[0013] Combining the first aspect and the above implementations, in certain implementations of the first aspect, the cross-sectional shape of the first groove body is symmetrically curved; the swinging sliding vane includes a curved portion and a flat portion. The curved portion fits on the inner wall of the first groove body, and the flat portion fits on the sliding vane; the opening of the first groove body faces the compressor cylinder.

[0014] Combining the first aspect and the above implementations, in certain implementations of the first aspect, the connection between the second groove body and the first groove body is a smooth transition connection.

[0015] Combining the first aspect and the above implementations, in certain implementations of the first aspect, the sliding vane is strip-shaped, and two sides in the width direction of the sliding vane form a preset included angle; the free end of the sliding vane is a rounded end.

[0016] In a second aspect, the present application provides a rotary compressor, including the rotary compressor lubrication system described in the first aspect of the present application.

[0017] The technical solutions provided in the embodiments of the present invention bring the following beneficial technical effects:

[0018] The lubrication system of the rotary compressor provided by the present invention realizes the sealing and opening of the space of the relief groove by arranging a lubricating oil hole at the bottom of the relief groove in the sliding vane movement space and arranging a movable ball in the lubricating oil hole. On the one hand, it can prevent the refrigerant entering the relief groove from leaking into the housing along the lubricating oil hole, preventing the reduction of the refrigerant content. On the other hand, it can timely supplement lubricating oil into the relief groove through the lubricating oil hole, so that the sliding vane is fully lubricated, ensuring both a high refrigeration efficiency of the rotary compressor and the service life of the rotary compressor.

[0019] The additional aspects and advantages of this application will be given in the subsequent parts and will be understood in detail from the subsequent description, or will be understood through the specific implementation of the present invention. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of the lubrication system of the rotary compressor in an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the assembled three-dimensional structure of the lubrication system of the rotary compressor in an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the planar structure of the lubrication system of the rotary compressor in an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the sectional structure of the cylinder head of the rotary compressor in an embodiment of the present invention. Detailed Embodiments

[0024] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The possible embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in the drawings herein. The embodiments described by referring to the drawings are exemplary and are used to make the understanding of the disclosure content of the present invention more thorough and comprehensive, and cannot be construed as a limitation to the present invention. In addition, if the detailed description of the known technology is non-essential to the features of the present invention shown, these technical details may be omitted.

[0025] Those skilled in the relevant art can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the technical field to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the prior art and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0026] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present application means the presence of the stated features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0027] In the prior art, especially in a sliding vane rotary compressor, a working chamber with a special shape is formed among the rotor, the sliding vane and the cylinder. As the rotor rotation angle changes, the volume of the gas in the volume continuously increases and decreases in a cycle, thereby completing the working process of the compressor and turning the low-temperature and low-pressure refrigerant vapor into high-temperature and high-pressure refrigerant. The motor drives the crankshaft to rotate, the crankshaft drives the rotor to roll periodically along the inner wall of the cylinder through an eccentric shaft, and drives the sliding vane to make a reciprocating swing along the rotating shaft between the sliding vane and the rotor. In this way, the refrigeration medium is continuously pushed to form a refrigeration cycle. Usually, for the convenience of processing, the working chamber is usually made into two intersecting cylinders. However, the space of the cylinder is relatively large, which will cause a large amount of refrigerant to accumulate.

[0028] In addition, the sliding vane makes a long-term periodic movement at a high speed in the working chamber and rubs against the cylinder. If good lubrication cannot be obtained, it will seriously affect the service life of the rotary compressor and will inevitably affect the refrigeration efficiency of the rotary compressor. Usually, the lubricating oil and the refrigerant in the compressor are both fluids, and it is inconvenient to distinguish their flows.

[0029] The lubrication system of the rotary compressor and the rotary compressor provided by the present invention aim to solve the above technical problems in the prior art. The technical solution of the present invention and how this technical solution solves the above technical problems will be described in detail below with specific embodiments.

[0030] It should be noted that the axial direction refers to the direction along a long and narrow object. For a cylindrical object, it is the direction of the rotation center axis of the cylinder, that is, the direction common to the central axis. For a cubic column object, it is the direction of the geometric central axis of the cubic column. The radial direction refers to the direction passing through the axis in the radial plane, which is the straight line direction along the diameter or radius, or the straight line direction perpendicular to the axis.

[0031] An embodiment of the first aspect of the present application provides a lubrication system for a rotary compressor, as Figures 1 to 3As shown in the figure, it includes a compressor cylinder 100, a compressor roller 200, a sliding vane 300, a cylinder head 500, and a ball 600. The sliding vane 300 is detachably connected to the compressor rotor and the compressor roller 200. A relief groove 110 is provided on the cylinder wall of the compressor cylinder 100, and the sliding vane 300 can move periodically within the relief groove 110.

[0032] As Figures 2 to 4 shown in the figure, the compressor cylinder 100 is fitted and connected to the cylinder head 500. A lubricating oil hole 510 is provided on the cylinder head 500. The lubricating oil hole 510 includes a first cavity 511 and a second cavity 512. The projection of the first cavity 511 in the second cavity 512 falls within the second cavity 512. The ball 600 is arranged in the second cavity 512 and outside the first cavity 511. The surface of the ball 600 is tangent to the opening edge of the first cavity 511 facing the second cavity 512. The opening of the second cavity 512 is located on the mating surface of the compressor cylinder 100 and the cylinder head 500 and within the relief groove 110. The compressor cylinder 100 blocks a part of the opening of the second cavity 512.

[0033] As Figure 3 and Figure 4 shown in the figure, one end of the lubricating oil hole 510 usually extends into the lubricating oil in the oil pan and is wetted by the lubricating oil, and the other end is opened in the relief groove 110. A ball 600 is arranged in the second cavity 512 of the lubricating oil hole 510. The shape and size of the ball 600 are smaller than those of the second cavity 512 and can move within the second cavity 512, and its shape and size are larger than those of the first cavity 511, so that it will not fall into the first cavity 511. During the periodic movement of the sliding vane 300, the ball 600 also moves periodically, although their movement forms are not the same.

[0034] When the sliding vane 300 enters the relief groove 110 and fills most of the space of the relief groove 110, the relief groove 110 is a relatively sealed space under the sealing of the upper and lower cylinder heads 500 of the compressor cylinder 100. The internal air pressure increases, which can press the ball 600 against the opening of the first cavity 511 to seal the lubricating oil hole 510. At this time, the internal air pressure in the relief groove 110 is relatively high, and the refrigerant is not likely to enter the relief groove 110 either.

[0035] When the sliding vane 300 is withdrawn from the relief groove 110, the air pressure in the relief groove 110 becomes smaller. Therefore, the external air pressure presses the lubricating oil into the relief groove 110 from the lubricating oil hole 510. At this time, the ball 600 is no longer pressed tightly against the opening of the first cavity 511, and a small amount of lubricating oil can enter the relief groove 110, thereby continuously supplementing the lubricating oil in the relief groove 110 in small amounts to provide lubrication for the relative movement between the sliding vane 300 and the compressor cylinder 100.

[0036] The lubrication system of the rotary compressor provided by the present invention realizes the sealing and opening of the space of the relief groove 110 by arranging a lubricating oil hole 510 at the bottom of the relief groove 110 in the movement space of the sliding vane 300 and arranging a movable ball 600 in the lubricating oil hole 510. On the one hand, it can prevent the refrigerant entering the relief groove 110 from leaking into the housing along the lubricating oil hole 510, preventing the reduction of the refrigerant content. On the other hand, it can timely supplement lubricating oil into the relief groove 110 through the lubricating oil hole 510, so that the sliding vane 300 is fully lubricated, ensuring both a high refrigeration efficiency of the rotary compressor and the service life of the rotary compressor.

[0037] Optionally, in some implementation manners of the first aspect embodiment, as Figure 4 shown, the cross-sectional shape of the lubricating oil hole 510 along the hole axis is funnel-shaped, the first hole cavity 511 is cylindrical, and the second hole cavity 512 is frustum-shaped. By setting the lubricating oil hole 510 in two forms of a cylindrical hole cavity and a frustum-shaped hole cavity, it can not only meet the accommodation and restriction of the ball 600, but also reduce the processing difficulty and reduce the production cost.

[0038] Optionally, in some implementation manners of the first aspect embodiment, as Figure 3 shown, the compressor cylinder 100 blocks half of the opening of the second hole cavity 512; the diameter of the ball 600 is greater than the cross-sectional diameter of the upper edge of the first hole cavity 511 in the radial direction, and the diameter of the ball 600 is less than the cross-sectional diameter of the upper edge of the second hole cavity 512 in the radial direction.

[0039] Optionally, in some implementation manners of the first aspect embodiment, as Figure 2 and Figure 3 shown, the relief groove 110 includes a first groove body 111 and a second groove body 112. The first groove body 111 is close to the cylinder wall of the compressor cylinder 100, the second groove body 112 is communicated with the first groove body 111, and the relief groove 110 forms a symmetric constriction neck at the connection of the first groove body 111 and the second groove body 112. Optionally, the sliding vane 300 further includes a swinging sliding vane 300; the first groove body 111 includes a curved inner wall; the swinging sliding vane 300 is arranged in the first groove body 111 and on both sides of the sliding vane 300; the cross-sectional shape of the second groove body 112 is the movement track of the free end on the sliding vane 300.

[0040] Optionally, in some implementation manners of the first aspect embodiment of the present application, as Figure 2 and Figure 3As shown, the cross-sectional shape of the first groove body 111 is a symmetric curve shape; the swinging sliding vane 300 includes a curved portion and a flat portion, the curved portion is attached to the inner wall of the first groove body 111, and the flat portion is attached to the sliding vane 300; the opening of the first groove body 111 faces the compressor cylinder 100. Optionally, the connection between the second groove body 112 and the first groove body 111 is a smooth transition connection.

[0041] Correspondingly, the swinging sliding vane 300 includes a curved portion and a flat portion, wherein the curved portion is attached to the inner wall of the first groove body 111, and the flat portion is attached to the sliding vane 300. Among them, the curve in the cross-sectional shape of the curved portion is specifically a unilateral hyperbolic shape, and the transition between the curved portion and the flat portion is smooth to ensure that the frictional effect during the movement of the swinging sliding vane 300 is as small as possible. The preset of the first groove body 111 is also to provide space for the periodic movement of the sliding vane 300. By adopting a hyperbolic cross-sectional shape, it can ensure that the inner wall of the first groove body 111 is as close as possible to the outermost edge of the movement track of the sliding vane 300 in the first groove body 111, that is, it can minimize the space of the first groove body 111.

[0042] Adopting a hyperbolic cross-sectional shape, the technical effect brought on the other hand is: it is convenient for the processing and manufacturing of the first groove body 111 and the swinging sliding vane 300. Of course, the first groove body 111 is one side hyperbolic shape of a certain hyperbola, and the specific functional relationship corresponding to the hyperbola is determined according to the actual production and manufacturing requirements of the rotor compressor cylinder 100. The curved surface type of the first groove body 111 can also be a part of a cylinder, and the corresponding cross-sectional shape of the first groove body 111 is a part of a circle.

[0043] Optionally, in some implementation manners of the first aspect embodiment of the present application, the sliding vane 300 is strip-shaped, and the two side surfaces in the width direction of the sliding vane 300 form a preset angle; the free end of the sliding vane 300 is a rounded end.

[0044] The sliding vane 300 is arranged at the notch of the relief groove 110, and part of the sliding vane 300 is located in the compression cylinder, that is, within the movement track range of the compressor roller 200. Specifically, as Figure 2 and Figure 3 shown, the sliding vane 300 is detachably connected to the compressor roller 200, and a snap connection can be specifically selected. For example, a dovetail groove is arranged at a certain position of the compressor roller 200, and the end of the sliding vane 300 is set into a shrink neck structure matching the dovetail groove. When the compressor roller 200 moves periodically, specifically, the compressor roller 200 moves closely against the cylinder wall, driving the sliding vane 300 connected to the compressor roller 200 to move.

[0045] A swing slide 300 is arranged in the first groove body 111. Under the restriction of the curved inner wall, the two opposite swing slides 300 can rotate around the geometric center of the first groove body 111. At the same time, the swing slides 300 are arranged on both sides of the slide 300, and the slide 300 can slide freely between the two swing slides 300, specifically slide relative to the swing slides 300. The swing slides 300 can block the substances in the compressor cylinder 100 from entering the relief groove 110, slow down the refrigerant from entering the relief groove 110, and can further improve the refrigeration efficiency of the rotary compressor.

[0046] Since the movement track of the free end on the slide 300 is affected by factors such as the size of the rotor, the eccentric position, the length of the slide 300, the connection position and method between the slide 300 and the rotor, this movement track of the free end is not a common circle, rectangle or triangle, but is similar to a spindle shape. Therefore, the cross-sectional shape of the second groove body 112 is also spindle-shaped. In fact, due to the limitation of the assembly relationship, the cross-sectional shape of the second groove body 112 will not be exactly the same as the movement track of the free end on the slide 300. The cross-sectional shape of the second groove body 112 is slightly larger than the movement track of the free end. For example, the contour line of the cross-sectional shape is spaced 0.5 mm to 1.5 mm from the outermost periphery of the movement track of the free end, so as to prevent the slide 300 from directly contacting the groove wall of the second groove body 112 during movement and causing wear.

[0047] The cylinder in the lubrication system of the rotary compressor provided by the present invention adopts a relief groove 110 with a special shape. The relief groove 110 includes a first groove body 111 and a second groove body 112. The second groove body 112 is set according to the movement track of the free end of the slide 300 in the rotary compressor cylinder 100, can fully approach the maximum movement range of the slide 300, effectively reduce unnecessary space margins, make the space of the relief groove 110 as small as possible, thereby greatly reducing the space that can accommodate the refrigerant, so as to reduce the leakage of the refrigerant, improve the refrigeration capacity, reduce the input power, and improve the refrigeration efficiency.

[0048] In a second aspect, the present application provides a rotary compressor, including the rotary compressor cylinder described in the first aspect of the present application. The rotary compressor may naturally also include other components, such as a liquid receiver, a suction silencing chamber, an exhaust valve plate, a limit plate, an exhaust silencing chamber, and a labyrinth structure, etc. These components are well known to those skilled in the art and will not be described in more detail.

[0049] Those skilled in the art can understand that the various operations, methods, steps, measures, and solutions in the processes discussed in this application can be alternated, changed, combined, or deleted. Further, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, changed, rearranged, decomposed, combined, or deleted. Further, those in the prior art that have steps, measures, and solutions in the various operations, methods, and processes disclosed in this application can also be alternated, changed, rearranged, decomposed, combined, or deleted.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0053] The above are only some embodiments of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A lubrication system for a rotary compressor, characterized in that, It includes a compressor cylinder, compressor rollers, sliding vanes, a cylinder head and balls; The sliding vane is detachably connected to the compressor roller. A relief groove is provided on the cylinder wall of the compressor cylinder, and the sliding vane can move periodically within the relief groove; The compressor cylinder is fitted and connected to the cylinder head. A lubricating oil hole is provided on the cylinder head below the compressor cylinder. One end of the lubricating oil hole extends into the lubricating oil in the oil pan. The lubricating oil hole includes a first hole cavity and a second hole cavity. The projection of the first hole cavity in the second hole cavity falls within the second hole cavity. The ball is arranged in the second hole cavity and outside the first hole cavity. The surface of the ball is tangent to the opening edge of the first hole cavity facing the second hole cavity; The opening of the second hole cavity is located on the mating surface of the compressor cylinder and the cylinder head and within the relief groove. The compressor cylinder blocks a part of the opening of the second hole cavity.

2. The rotor compressor lubrication system according to claim 1, wherein The cross-sectional shape of the lubricating oil hole along the hole axis is funnel-shaped. The first hole cavity is cylindrical, and the second hole cavity is frustum-shaped.

3. The lubrication system of the rotary compressor according to claim 2, wherein, The compressor cylinder blocks one-half of the opening of the second hole cavity; the diameter of the ball is greater than the cross-sectional diameter of the first hole cavity along the radial direction, and the diameter of the ball is less than the cross-sectional diameter of the second hole cavity along the radial direction.

4. The lubrication system of the rotary compressor according to claim 1, characterized in that, The relief groove includes a first groove body and a second groove body. The first groove body is close to the cylinder wall of the compressor cylinder. The second groove body communicates with the first groove body. The relief groove forms a symmetric constriction neck at the connection of the first groove body and the second groove body.

5. The rotor compressor lubrication system according to claim 4, wherein, The sliding vane further includes a swinging sliding vane; the first groove body includes a curved inner wall; the swinging sliding vane is arranged within the first groove body and on both sides of the sliding vane; the cross-sectional shape of the second groove body is the movement track of the free end of the sliding vane.

6. The rotor compressor lubrication system according to claim 5, wherein The cross-sectional shape of the first groove body is symmetrically curved; the swinging sliding vane includes a curved portion and a flat portion. The curved portion fits on the inner wall of the first groove body, and the flat portion fits on the sliding vane; the opening of the first groove body faces the compressor cylinder.

7. The lubrication system of a rotary compressor according to claim 4, characterized in that, The connection between the second groove body and the first groove body is a smooth transition connection.

8. The rotor compressor lubrication system according to claim 1, characterized in that, The sliding vane is strip-shaped. The two side surfaces in the width direction of the sliding vane form a preset angle; the free end of the sliding vane is a rounded end.

9. A rotary compressor, characterized in that, It includes a rotor compressor lubrication system according to any one of claims 1 to 8.

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