Flow guide cover and compressor

Abstract

The invention belongs to the technical field of compressors, and discloses a flow guide cover and a compressor, the compressor comprises a compression stage, a crankshaft, a mixing cavity and an oil pool, the compression stage, the mixing cavity and the oil pool are sequentially arranged from top to bottom, a cover plate is arranged below the mixing cavity, the crankshaft penetrates through the compression stage, the mixing cavity and the cover plate, the flow guide cover comprises a flow guide part, and the flow guide part is located between the cover plate and the oil pool. The crankshaft penetrates through the flow guide part, the first end of the flow guide part is located on the side close to the cover plate, the flow guide part is arranged in a flaring shape from the first end to the second end, and in the axial direction of the crankshaft, the projection area of the cover plate and the projection area of the flow guide part are at least partially overlapped. According to the flow guide cover and the compressor provided by the invention, a refrigerant on the cover plate on the outer side of the mixing cavity is prevented from directly dropping into an oil pool after being cooled to dilute internal lubricating oil, and the state of the lubricating oil is prevented from deteriorating.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a guide cover and a compressor. Background Art

[0002] At present, most rotary compressors are designed with high back pressure, that is, the refrigerant discharged outside the pump body in the shell is high-pressure and high-temperature. Taking an injection-enhanced enthalpy rotary compressor with multiple compression stages as an example, it includes a shell and multiple compression stages arranged in the shell, and also includes a crankshaft, a mixing chamber and an oil sump. The multiple compression stages, the mixing chamber and the oil sump are arranged in sequence from top to bottom. A cover plate is provided below the mixing chamber, and the crankshaft passes through the multiple compression stages, the mixing chamber and the cover plate. Each compression stage correspondingly includes a cylinder, the crankshaft is connected to the cylinders of the multiple compression stages, and the rotation of the crankshaft can drive the multiple cylinders to rotate. The mixing chamber is used for the refrigerant of the compression stages except the last stage to flow. Since the temperature in the mixing chamber is relatively low, at this time, the gaseous refrigerant is likely to condense into droplets on the bottom surface of the cover plate after being cooled and then drip into the oil sump at the bottom of the compressor. This will dilute the lubricating oil, resulting in adverse consequences such as deterioration of the lubrication state and increased input. Summary of the Invention

[0003] The purpose of the present invention is to provide a guide cover and a compressor, which can prevent the refrigerant on the outer cover plate of the mixing chamber from directly dripping into the oil sump after being cooled and liquefied, so as to prevent the deterioration of the lubrication state.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A guide cover is arranged in a compressor. The compressor includes a compression stage, a crankshaft, a mixing chamber and an oil sump. The compression stage, the mixing chamber and the oil sump are arranged in sequence from top to bottom. A cover plate is provided below the mixing chamber, and the crankshaft passes through the compression stage, the mixing chamber and the cover plate. The guide cover includes:

[0006] A guiding portion, which is located between the cover plate and the oil sump, the crankshaft passes through the guiding portion, the first end of the guiding portion is located on the side close to the cover plate, the guiding portion is arranged in a flared shape from the first end to the second end, and along the axial direction of the crankshaft, at least part of the projection area of the cover plate overlaps with the projection area of the guiding portion.

[0007] Preferably, the guiding portion is arranged to be linearly inclined outward from the first end to the second end, and the angle α between the guiding portion and the axial direction of the crankshaft is set to 90°-180°.

[0008] Preferably, the guiding portion is arranged to be curved outward in an arc shape from the first end to the second end.

[0009] Preferably, the compressor includes a housing, the cover plate is provided with a first through hole, and the flow guide cover further includes:

[0010] A first fixing portion, the first fixing portion is disposed at a first end of the flow guiding portion, the crankshaft passes through the first through hole, and the first fixing portion is fixedly connected to the first through hole; and / or,

[0011] A second fixing portion, the second fixing portion is disposed at a second end of the flow guiding portion, and the second fixing portion is fixed to the housing or connected to the compression stage.

[0012] Preferably, the first fixing portion is arranged in a ring shape, and the first fixing portion is fixedly inserted into the first through hole.

[0013] Preferably, an interference fit is provided between the first fixing portion and the first through hole; or,

[0014] The first fixing portion and the first through hole are fixedly connected by welding; or,

[0015] The first fixing portion and the first through hole are snap-fitted.

[0016] Preferably, the second fixing portion is arranged in a ring shape, and the second fixing portion is fixedly inserted into the housing or the compression stage.

[0017] Preferably, an interference fit is provided between the second fixing portion and the housing or the compression stage; or,

[0018] The second fixing portion and the housing or the compression stage are fixedly connected by welding; or,

[0019] The second fixing portion and the housing or the compression stage are snap-fitted.

[0020] Preferably, an oil through hole is provided on the flow guiding portion.

[0021] A compressor, including the flow guide cover according to any one of the above, further includes a housing, and the compression stage, the crankshaft, the mixing chamber, and the oil sump are all located in the housing.

[0022] Beneficial effects:

[0023] The deflector provided by the present invention is disposed between the cover plate and the oil sump, and the projection of the cover plate in the axial direction of the crankshaft at least partially overlaps with the projection area of the deflector portion. When the gaseous refrigerant inside the compressor condenses into a liquid on the lower surface of the cover plate, it will not directly drip into the oil sump, but fall onto the upper surface of the deflector portion. When the liquid refrigerant exists on the deflector portion, it may be vaporized again under the action of the high-temperature refrigerant and discharged from the compressor, without diluting the lubricating oil and preventing the lubrication state from deteriorating. In addition, the first end of the deflector portion is located on the side close to the cover plate, and the deflector portion of the deflector portion is provided in a flared shape from the first end to the second end. Even if the liquid refrigerant flows downward along the deflector portion and drips into the oil sump, it will not directly drip onto the oil suction hole at the center of the crankshaft, but drip onto the edge of the oil sump far from the oil suction hole, also avoiding the liquid refrigerant falling into the center of the oil sump and flowing away directly through the oil suction hole, deteriorating the lubrication state.

[0024] The compressor provided by the present invention includes the above-mentioned deflector, effectively avoiding the refrigerant on the cover plate outside the mixing chamber from directly dripping into the oil sump after being cooled into a liquid state to dilute the internal lubricating oil and preventing the lubrication state from deteriorating. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the compressor provided by the present invention;

[0026] Figure 2 is a structural sectional view of the deflector provided by an embodiment of the present invention;

[0027] Figure 3 is a structural sectional view of the deflector provided by another embodiment of the present invention;

[0028] Figure 4 is a top view of the deflector provided by another embodiment of the present invention;

[0029] Figure 5 is a structural sectional view of the deflector provided by yet another embodiment of the present invention;

[0030] Figure 6 is a top view of the deflector provided by yet another embodiment of the present invention.

[0031] In the figure:

[0032] 1. Deflector; 11. Deflector portion; 111. Oil passage hole; 112. Second perforation; 12. First fixing portion; 13. Second fixing portion;

[0033] 2. Compression stage;

[0034] 3. Crankshaft; 31. Oil suction hole;

[0035] 4. Mixing chamber;

[0036] 5. Cover plate; 51. First perforation. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention and not for limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0038] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0040] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0041] This embodiment provides a compressor. Refer to Figures 1 to 6As shown in the figure, the compressor includes a compression stage 2, a crankshaft 3, a mixing chamber 4 and an oil sump. The compression stage 2, the mixing chamber 4 and the oil sump are arranged in sequence from top to bottom. A cover plate 5 is provided below the mixing chamber 4, and the crankshaft 3 passes through the compression stage 2, the mixing chamber 4 and the cover plate 5. The compressor further includes a housing, and the compression stage 2, the crankshaft 3, the mixing chamber 4 and the oil sump are all located inside the housing. The compressor further includes a guide cover 1, and the guide cover 1 includes a guiding portion 11. The guiding portion 11 is located between the cover plate 5 and the oil sump. The crankshaft 3 passes through the guiding portion 11. The first end of the guiding portion 11 is located on the side close to the cover plate 5. The guiding portion 11 is arranged in a flared shape from the first end to the second end, and along the axial direction of the crankshaft 3, at least part of the projection area of the cover plate 5 overlaps with the projection area of the guiding portion 11.

[0042] In this embodiment, the guide cover 1 is arranged between the cover plate 5 and the oil sump, and at least part of the projection of the cover plate 5 along the axial direction of the crankshaft 3 overlaps with the projection area of the guiding portion 11. When the gaseous refrigerant inside the compressor condenses into a liquid on the lower surface of the cover plate 5, it will not directly drip into the oil sump, but fall onto the upper surface of the guiding portion 11. When the liquid refrigerant exists in the guiding portion 11, it may be vaporized again under the action of the high-temperature refrigerant and discharged from the compressor, without diluting the lubricating oil and preventing the lubrication state from deteriorating. In addition, the first end of the guiding portion 11 is located on the side close to the cover plate 5, and the guiding portion 11 of the guide cover 1 is arranged in a flared shape from the first end to the second end. Even if the liquid refrigerant flows downward along the guiding portion 11 and drips into the oil sump, it will not directly drip onto the oil suction hole 31 at the center of the crankshaft 3, but drip onto the position of the edge of the oil sump far from the oil suction hole 31, also avoiding the liquid refrigerant falling into the center of the oil sump and flowing away directly through the oil suction hole 31, deteriorating the lubrication state.

[0043] The compressor provided by the present invention includes the above-mentioned guide cover 1, which effectively avoids the refrigerant on the cover plate 5 outside the mixing chamber 4 dripping directly into the oil sump after being cooled into a liquid to dilute the internal lubricating oil and prevent the lubrication state from deteriorating.

[0044] As an optional implementation manner, the guiding portion 11 is arranged to be linearly inclined outward from the first end to the second end, and the angle α between the guiding portion 11 and the axial direction of the crankshaft 3 is set to 90° - 180°. Specifically, setting the guiding portion 11 to be linear has a simple structure and is convenient for processing. The closer the angle α between the guiding portion 11 and the axial direction of the crankshaft 3 is to 90°, the better the effect of preventing the liquid refrigerant from entering the bottom oil sump.

[0045] As an optional implementation manner, the guiding portion 11 is arranged to be curved outward in an arc shape from the first end to the second end. Specifically, setting the guiding portion 11 to be a curved arc shape can make the liquid refrigerant flow smoothly. The closer to the edge position of the second end of the guiding portion 11, the smaller the arc curvature can be set, effectively slowing down the flow rate of the liquid refrigerant and enabling the liquid refrigerant to evaporate effectively on the premise of not dripping from the guiding portion 11 as much as possible.

[0046] In this embodiment, the cover plate 5 is provided with a first through hole 51. The first through hole 51 can allow the crankshaft 3 to pass through.

[0047] Optionally, the flow guide cover 1 further includes a first fixing portion 12. The first fixing portion 12 is provided at the first end of the flow guiding portion 11. The crankshaft 3 passes through the first through hole 51, and the first fixing portion 12 is fixedly connected to the first through hole 51. By providing the first fixing portion 12, an effective fixed connection can be achieved with the first through hole 51, thereby fixing the entire flow guide cover 1 to the bottom of the cover plate 5.

[0048] In this embodiment, the first fixing portion 12 is arranged in a ring shape, and the first fixing portion 12 is fixedly inserted into the first through hole 51. The ring-shaped first fixing portion 12 is inserted into the first through hole 51, and the outer peripheral wall of the first fixing portion 12 is in close fit with the inner wall of the first through hole 51.

[0049] Optionally, an interference fit is provided between the first fixing portion 12 and the first through hole 51. With this arrangement, the structure is simple and the disassembly and assembly are convenient.

[0050] Optionally, the first fixing portion 12 and the first through hole 51 are fixedly connected by welding. With this arrangement, the fixation is reliable and the firmness is high.

[0051] Optionally, a snap-fit is provided between the first fixing portion 12 and the first through hole 51. Specifically, one of the inner wall of the first fixing portion 12 and the first through hole 51 is provided with a first snap joint, and the other is provided with a first snap groove. The fixation between the first fixing portion 12 and the first through hole 51 is achieved through the snap connection between the first snap joint and the first snap groove.

[0052] Optionally, the flow guide cover 1 further includes a second fixing portion 13. The second fixing portion 13 is provided at the second end of the flow guiding portion 11. The second fixing portion 13 is fixedly connected to the housing of the compressor or the compression stage 2. By providing the second fixing portion 13, the flow guide cover 1 can be directly fixedly inserted into the housing or the compression stage 2 without relying on the first through hole 51 of the cover plate 5, and the reliable fixation of the flow guide cover 1 can also be achieved.

[0053] In this embodiment, the second fixing portion 13 is arranged in a ring shape, and the second fixing portion 13 is fixedly inserted into the housing. The ring-shaped second fixing portion 13 is inserted into the housing, and the outer peripheral wall of the second fixing portion 13 is in close fit with the inner wall of the housing. In addition, the second fixing portion 13 can also be fixedly inserted onto the compression stage 2. A circular insertion hole (not shown) for the second fixing portion 13 to be inserted is correspondingly provided on the compression stage 2, or the inner wall of the second fixing portion 13 is in close fit with the outer peripheral wall of the compression stage 2, and the reliable connection of the flow guide cover 1 can also be achieved.

[0054] Optionally, an interference fit is provided between the second fixing portion 13 and the housing or the compression stage 2. With this arrangement, the structure is simple and the disassembly and assembly are convenient.

[0055] Optionally, the second fixing portion 13 is fixedly welded to the housing or the compression stage 2. With such a setting, the fixing is reliable and the firmness is high.

[0056] Optionally, the second fixing portion 13 is snap-fitted with the housing. Specifically, one of the second fixing portion 13 and the inner wall of the housing is provided with a second snap joint (not shown), and the other is provided with a second snap groove (not shown). The fixing between the second fixing portion 13 and the housing is achieved through the snap connection between the second snap joint and the second snap groove.

[0057] Optionally, the second fixing portion 13 is snap-fitted with the compression stage 2. Specifically, one of the second fixing portion 13 and the compression stage 2 is provided with a third snap joint (not shown), and the other is provided with a third snap groove (not shown). The fixing between the second fixing portion 13 and the compression stage 2 is achieved through the snap connection between the third snap joint and the third snap groove.

[0058] Optionally, the flow guide cover 1 may be provided with only the first fixing portion 12, or only the second fixing portion 13, or both the first fixing portion 12 and the second fixing portion 13 may be provided at the same time.

[0059] Optionally, the flow guide portion 11, the first fixing portion 12 and the second fixing portion 13 are integrally formed. With such a setting, the processing is convenient and external connecting parts such as screws and bolts do not need to be introduced.

[0060] In this embodiment, a second through hole 112 is formed in the flow guide portion 11. The second through hole 112 is used for the crankshaft 3 to pass through.

[0061] In this embodiment, an oil through hole 111 is formed in the flow guide portion 11. Specifically, since there is a mixture of refrigerant and lubricating oil in the housing of the compressor, after the gaseous refrigerant is liquefied, it will be mixed with the lubricating oil outside the oil sump in the housing, and the mixture will drip onto the flow guide portion 11 after mixing. Since the refrigerant in the mixed liquid can be separated from the lubricating oil after preheating and vaporization, by providing the oil through hole 111, the separated lubricating oil droplets can finally fall back into the oil return sump through the oil through hole 111.

[0062] Optionally, a plurality of oil through holes 111 are provided, and the plurality of oil through holes 111 are spaced apart along the circumferential direction of the flow guide portion 11.

[0063] Preferably, the plurality of oil through holes 111 are spaced apart along the circumferential direction at the second end of the flow guide cover 1. With such a setting, it can prevent the unvaporized liquid refrigerant from directly dripping into the center of the oil return sump and being directly sucked into the crankshaft by the oil suction hole 31, thus affecting the lubrication performance of the compressor.

[0064] Optionally, the shape of the oil through hole 111 is set as an arc-shaped waist-shaped hole.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A deflector, arranged in a compressor, the compressor comprising a compression stage (2), a crankshaft (3), a mixing chamber (4) and an oil pool, the compression stage (2), the mixing chamber (4) and the oil pool being arranged in sequence from top to bottom, a cover plate (5) being arranged below the mixing chamber, the crankshaft (3) passing through the compression stage (2), the mixing chamber (4) and the cover plate (5), characterized in that: The deflector comprises: A flow guide portion (11), the flow guide portion (11) being located between the cover plate (5) and the oil pool, the crankshaft (3) passing through the flow guide portion (11), the first end of the flow guide portion (11) being located on a side close to the cover plate (5), the flow guide portion (11) being arranged in a flared shape from the first end to the second end, and along the axial direction of the crankshaft (3), the projection area of ​​the cover plate (5) and the projection area of ​​the flow guide portion (11) at least partially overlap.

2. The air deflector according to claim 1, characterized in that: The guide portion (11) is arranged to be inclined outward in a straight line from the first end to the second end, and the angle α between the guide portion (11) and the axial direction of the crankshaft (3) is set to be 90°-180°.

3. The air deflector according to claim 1, characterized in that: The guide portion (11) is arranged to bend outwards in an arc shape from the first end to the second end.

4. The air deflector according to claim 1, characterized in that: The compressor comprises a shell, the cover plate (5) is provided with a first through hole (51), and the air guide cover further comprises: a first fixing portion (12), the first fixing portion (12) being arranged at a first end of the air guide portion (11), the crankshaft (3) being provided with the first through hole (51), the first fixing portion (12) being fixedly connected to the first through hole (51); and / or, A second fixing portion (13), wherein the second fixing portion (13) is arranged at a second end of the flow guide portion (11), and the second fixing portion (13) is fixedly connected to the shell or the compression stage (2).

5. The air deflector according to claim 4, characterized in that: The first fixing portion (12) is configured to be ring-shaped, and the first fixing portion (12) is fixedly inserted into the first through hole (51).

6. The air deflector according to claim 5, characterized in that: The first fixing portion (12) and the first through hole (51) are fitted with an interference fit; or, The first fixing portion (12) is fixed to the first through hole (51) by welding; or, The first fixing portion (12) is snap-fitted with the first through hole (51).

7. The air deflector according to claim 4, characterized in that: The second fixing portion (13) is arranged in a ring shape, and the second fixing portion (13) is fixedly plugged into the housing or the compression stage (2).

8. The air deflector according to claim 7, characterized in that: The second fixing portion (13) is plug-fitted with the housing or the compression stage (2) in an interference fit; or, The second fixing portion (13) is fixed to the shell or the compression stage (2) by welding; or, The second fixing portion (13) is snap-fitted with the housing or the compression stage (2).

9. The air deflector according to claim 4, characterized in that: The flow guide portion (11) is provided with an oil hole (111).

10. A compressor, characterized in that: The invention comprises a fairing (1) as claimed in any one of claims 1 to 9, and further comprises a shell, wherein the compression stage (2), the crankshaft (3), the mixing chamber (4), and the oil pool are all located in the shell.

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