Rotor compressor and oil-gas separation mechanism thereof

Abstract

The oil-gas separation mechanism of the rotor compressor comprises an upper wind shield and an oil blocking piece, the upper wind shield comprises an end plate and a surrounding plate, and the oil blocking piece comprises a plate body, a balance block and a positioning column. First through-flow holes and second through-flow holes are formed in a surrounding plate of the upper wind shield, the first through-flow holes are distributed in the outer side of the oil blocking face of the balance block, the second through-flow holes are distributed in the outer side of the oil blocking face of the plate body, and the second through-flow holes are higher than the first through-flow holes. The invention further provides a rotor compressor which comprises the oil-gas separation mechanism. The rotor compressor has the beneficial effects that the first through-flow hole and the second through-flow hole which are different in height are formed in the coaming of the upper wind shield, so that lubricating oil accumulated at different positions of the oil baffle piece is conveniently discharged, the lubricating oil is prevented from being carried out of the rotor compressor by airflow, and the oil discharge rate of the rotor compressor is reduced.

Description

Technical Field

[0001] This invention relates to the field of rotary compressor technology, and in particular to a rotary compressor and its oil-gas separation mechanism. Background Technology

[0002] A rotary compressor typically includes a housing, a pump assembly, a motor assembly, an intake pipe, and an exhaust pipe. The motor assembly consists of a stator and a rotor. When the compressor is running, the rotor rotates inside the stator and drives the piston to make eccentric movements within the cylinder via the crankshaft of the pump assembly. This compresses the low-pressure gas entering the cylinder through the intake pipe, resulting in high-pressure gas. The high-pressure gas is then output to the heat exchange system through the exhaust pipe.

[0003] The bottom of the casing stores lubricating oil. During the operation of the rotary compressor, the lubricating oil enters various components inside the compressor through the oil delivery channel inside the crankshaft for lubrication. Because the compressed high-pressure gas passes through the gaps between the pump assembly and the motor assembly to reach the top of the casing, some lubricating oil mixes with the high-pressure gas as it is discharged upwards. This mixture then enters the heat exchange system along with the high-pressure gas. The lubricating oil entering the heat exchange system forms an oil film on the pipe walls, affecting the heat exchange efficiency.

[0004] To reduce oil discharge rate, traditional rotary compressors often incorporate structures such as oil baffles and air deflectors to separate lubricating oil from high-pressure gas. However, oil can easily accumulate between the air deflector and the balance block, and the airflow between the air deflector and the oil baffle tends to flow upwards. This upward airflow can easily carry the accumulated oil out of the rotary compressor, increasing the oil discharge rate. Summary of the Invention

[0005] The purpose of this invention is to provide an oil-gas separation mechanism for a rotary compressor, which can rectify the gas discharged from the rotor flow passage, improve the oil-gas separation rate of lubricating oil and gas, reduce the oil discharge rate of the rotary compressor, and improve the reliability of the rotary compressor.

[0006] This invention provides an oil-gas separation mechanism for a rotary compressor, comprising: an upper baffle, including an end plate and a surrounding plate disposed around the outer periphery of the end plate; the end plate is disposed on the upper end surface of the rotor and has a central hole at its center; the surrounding plate extends from the end plate toward the side away from the rotor; an oil baffle, disposed above the end plate and inside the surrounding plate, including a plate body, a balance block, and a plurality of positioning pins; a circumferential exhaust gap is formed between the plate body and the surrounding plate; a through hole communicating with the central hole is provided at the center of the plate body; the balance block and the plurality of positioning pins are circumferentially distributed at intervals at the bottom of the plate body along the through hole and are connected to the upper end surface of the rotor together with the end plate; the oil baffle surface of the oil baffle includes a plate body oil baffle surface disposed at the bottom of the plate body and a balance block oil baffle surface disposed at the bottom of the balance block; the surrounding plate is also provided with a first flow hole and a second flow hole, the first flow hole being distributed outside the balance block oil baffle surface and the second flow hole being distributed outside the plate body oil baffle surface, the second flow hole being higher than the first flow hole.

[0007] Preferably, a gap is formed between the oil-blocking surface of the balance block and the upper surface of the end plate.

[0008] Preferably, the oil-blocking surface of the balance block is further provided with a plurality of protrusions that abut against the upper surface of the end plate.

[0009] Preferably, the top of the second flow hole is higher than the oil-blocking surface of the plate, and the height difference L2 between the two is greater than 1 mm.

[0010] Preferably, the height L3 of the second flow hole is in the range of 1mm≤L3≤10mm.

[0011] Preferably, the inner diameter of the plate is D1, the inner diameter of the surrounding plate is D2, and D2-D1≥1mm.

[0012] Preferably, the rotor is provided with a plurality of rotor flow holes extending along its own axial direction, the rotor flow holes penetrating the upper and lower end faces of the rotor, and the central hole is connected to the rotor flow holes.

[0013] Preferably, the total cross-sectional area of ​​the plurality of rotor flow passages is S.

[0014] Preferably, the outer diameter D3 of the enclosure is smaller than the maximum outer diameter of the rotor.

[0015] The present invention also provides a rotary compressor, including the aforementioned oil-gas separation mechanism.

[0016] The advantage of this invention is that by opening a first flow hole and a second flow hole at different heights on the upper windshield, it is convenient to discharge the lubricating oil accumulated at different positions on the oil baffle, preventing the lubricating oil from being carried out of the rotor compressor by the airflow and reducing the oil discharge rate of the rotor compressor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation structure of the oil-gas separation mechanism of the present invention on the rotor;

[0018] Figure 2 This is a structural diagram of the upper windshield;

[0019] Figure 3 This is a structural schematic diagram of the oil baffle component;

[0020] Figure 4 This is a cross-sectional view of the installation structure of the oil-gas separation mechanism of the present invention on the rotor;

[0021] Figure 5 This is a top view of the oil-gas separation mechanism of the present invention.

[0022] Component marking instructions:

[0023] 1. Oil baffle

[0024] 11 plate body

[0025] 111 Plate oil-blocking surface

[0026] 12 balance weights

[0027] 121 Balance weight oil baffle surface

[0028] 13. Protrusion

[0029] 131 First connecting hole

[0030] 14 Positioning Posts

[0031] 141 Second connecting hole

[0032] 15 Extension

[0033] 151 Through Hole

[0034] 2. Upper windshield

[0035] 21 end plate

[0036] 211 Third connecting hole

[0037] 212 positioning hole

[0038] 213 Center Hole

[0039] 22. Enclosure

[0040] 221 First flow hole

[0041] 222 Second flow orifice

[0042] 3 rotors

[0043] 31 Shaft Hole

[0044] 4. Lower windshield

[0045] 5. Exhaust clearance Detailed Implementation

[0046] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "top," "bottom," "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 the 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 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 according to the specific circumstances.

[0049] Figure 1 The diagram shown is a schematic of the installation structure of the oil-gas separation mechanism of the present invention on the rotor. In the following description, it will be referred to as... Figure 1 The attached diagram serves as a reference for orientation, defining the axial direction of rotor 3 as the up-down direction, with the upper windshield 2 positioned above the lower windshield 4.

[0050] The bottom of the rotary compressor casing stores lubricating oil. During compressor operation, the lubricating oil enters various internal components of the rotary compressor through the oil delivery channel inside the crankshaft for lubrication. As high-pressure gas is discharged upwards, some lubricating oil mixes with the high-pressure gas to form an oil-gas mixture, which then enters the heat exchange system along with the high-pressure gas.

[0051] like Figure 4As shown, the rotor 3 is provided with a shaft hole 31 extending along its own axial direction and several rotor flow holes. Both the shaft hole 31 and the rotor flow holes penetrate the upper and lower end faces of the rotor 3. The shaft hole 31 is located at the center of the rotor 3 and is used for the crankshaft to pass through. Several rotor flow holes are distributed around the shaft hole 31 at intervals along the circumference of the shaft hole 31 and are used for the high-pressure gas inside the rotor compressor to flow upward.

[0052] To separate high-pressure gas and lubricating oil from the oil-gas mixture flowing out of the rotor passage orifice and reduce the oil discharge rate of the rotary compressor, this invention provides an oil-gas separation mechanism for a rotary compressor, and a rotary compressor equipped with the oil-gas separation mechanism. Figure 1 As shown, the oil-gas separation mechanism is located on the upper end face of the rotor 3 and includes an upper windshield 2 and an oil baffle 1.

[0053] like Figure 2 and Figure 4 As shown, the upper windshield 2 includes an end plate 21 and a surrounding plate 22 disposed around the end plate 21. The end plate 21 is disposed on the upper surface of the rotor 3 and can rotate synchronously with the rotor 3. A central hole 213 is provided at the center of the end plate 21, and the surrounding plate 22 extends from the end plate 21 to the side away from the rotor 3 (i.e., above). Specifically, the central hole 213 is coaxially disposed with the shaft hole 31, and the projection of the central hole 213 on the upper surface of the rotor 3 covers the area where several rotor flow holes are located, so that the central hole 213 is connected to the shaft hole 31 and several rotor flow holes respectively. In this way, the crankshaft can pass through the shaft hole 31 and the central hole 213 in sequence, and the oil-gas mixture in the rotor compressor can enter the upper windshield 2 through the rotor flow holes and the central hole 213.

[0054] like Figure 3-5 As shown, the oil baffle 1 is located above the end plate 21 and inside the surrounding plate 22. It includes a plate body 11, a balance block 12, and several positioning pins 14. A circumferential exhaust gap 5 is formed between the plate body 11 and the surrounding plate 22. The center of the plate body 11 has a through hole 151 that communicates with the central hole 213. The through hole 151 is coaxially arranged with the central hole 213, allowing the crankshaft to pass through smoothly. The balance block 12 and several positioning pins 14 are distributed circumferentially at intervals along the through hole 151 at the bottom of the plate body 11, and together with the end plate 21, they are connected to the upper end face of the rotor 3. Therefore, the oil baffle 1 can rotate synchronously with the upper windshield 2 and the rotor 3. The oil-blocking surface of the oil-blocking component 1 includes the plate oil-blocking surface 111 located at the bottom of the plate 11 and the balance block oil-blocking surface 121 located at the bottom of the balance block 12. The plate oil-blocking surface 111 is higher than the balance block oil-blocking surface 121. Together, they form the lower surface of the oil-blocking component 1, which is used to collide with the oil-gas mixture entering the upper windshield 2 from the central hole 213, and prevent the oil-gas mixture from leaving the rotor compressor directly.

[0055] like Figure 2 and Figure 4 As shown, the enclosure 22 is also provided with a first flow passage 221 and a second flow passage 222. The first flow passage 221 is located on the outer side of the oil-blocking surface 121 of the balance block, and the second flow passage 222 is located on the outer side of the oil-blocking surface 111 of the plate. Specifically, the second flow passage 222 is higher than the first flow passage 221, and both are elongated. Of course, the shapes of the first flow passage 221 and the second flow passage 222 can also be circular, oblong, or other shapes, as long as they can meet the flow requirements; the specific shapes are not limited.

[0056] Because the gas inside the compressor tends to flow upwards, the oil-gas mixture entering the upper baffle 2 through the rotor flow holes and the central hole 213 collides with the oil-blocking surface of the oil-blocking component 1 and collects into oil droplets on the oil-blocking surface. When the rotor 3 rotates at high speed, the oil droplets are thrown outwards under the action of centrifugal force. At this time, the oil droplets distributed on the oil-blocking surface 121 of the balance block are thrown out from the first flow hole 221, and the oil droplets distributed on the oil-blocking surface 111 of the plate are thrown out from the second flow hole 222. The thrown-out oil droplets return to the oil pool located at the bottom of the rotor compressor housing under their own gravity. At the same time, the cavity formed by the upper baffle 2 and the oil-blocking component 1 rectifies and silences the high-pressure gas in the oil-gas mixture. Among them, the enclosure plate 22 rectifies the high-pressure gas once, the exhaust gap 5 rectifies the high-pressure gas a second time, and the first flow hole 221 and the second flow hole 222 also rectify the high-pressure gas passing through them. After rectification, the high-pressure gas flows out of the rotary compressor and into the heat exchange system. Thus, the oil-gas separation mechanism separates the lubricating oil and high-pressure gas, effectively reducing the oil discharge rate of the rotary compressor.

[0057] like Figure 3 As shown, in a specific embodiment of the present invention, the oil baffle 1 is an integrally formed structure. This configuration can enhance the overall strength of the oil baffle 1 and improve its assembly efficiency. The shape of the plate 11 can be circular, polygonal, or other irregular shapes, specifically circular.

[0058] Furthermore, such as Figure 3 and Figure 4 As shown, an extension 15 extending towards the side (i.e., downward) closer to the rotor 3 is provided at the center of the plate 11, and a through hole 151 is formed in the extension 15. The lower end of the extension 15 extends through the central hole 213 and abuts against the upper end surface of the rotor 3. This can prevent the oil-gas mixture from flowing directly out of the oil-gas separation mechanism from the through hole 151, thus reducing the oil-gas separation effect.

[0059] The oil-blocking surface 121 of the balance block can abut against the upper surface of the end plate 21. Preferably, a gap is formed between the oil-blocking surface 121 of the balance block and the upper surface of the end plate 21. This gap has two advantages: first, it prevents high-pressure gas from being difficult to discharge due to the obstruction of the balance block 121, thus avoiding an imbalance in the circumferential force of the oil-gas separation mechanism during exhaust; second, it facilitates the collection of small oil droplets on the oil-blocking surface 121, forming larger oil droplets. These larger droplets are less likely to be carried away by the upward airflow under their own gravity, and are more easily discharged from the first flow hole 221 under centrifugal force, thereby reducing the oil discharge rate of the rotor compressor. More preferably, the height L1 of the gap (i.e., the height difference between the oil-blocking surface 121 of the balance block and the upper surface of the end plate 21) is greater than 1 mm. The first flow hole 221 is located on the surrounding plate 22 at a position corresponding to the oil baffle surface 121 of the balance block. Its bottom is flush with the upper surface of the end plate 21 and there is no height difference. With this arrangement, when the oil droplets that gather on the oil baffle surface 121 of the balance block reach the surrounding plate 22 through the gap, the oil can be discharged directly from the first flow hole 221, and then flow downward along the gap between the rotor 3 and the stator, and finally return to the oil sump.

[0060] Furthermore, the oil-blocking surface 121 of the balance block is also provided with several protrusions 13 that abut against the upper surface of the end plate 21, and the height of the protrusions 13 is greater than 1 mm. The protrusions 13 make it easy to form a gap between the oil-blocking surface 121 of the balance block and the upper surface of the end plate 21.

[0061] like Figure 4 As shown, the top of the second flow passage 222 is higher than the oil baffle surface 111 of the plate, and the height difference L2 between the two is greater than 1mm. This height difference ensures that the oil droplets collected on the oil baffle surface 111 will be thrown out of the second flow passage 222 under the combined action of centrifugal force and upward airflow force, and then flow downward along the gap between the rotor 3 and the stator and the stator tangential edge, eventually returning to the oil sump. The value range of the height L3 of the second flow passage 222 is: 1mm≤L3≤10mm. The specific value of L3 needs to be adjusted appropriately according to the discharge volume of the rotor compressor to achieve the best noise reduction.

[0062] The total number of first flow passages 221 and second flow passages 222 is not limited and can be 2-4, preferably including one first flow passage 221 and three second flow passages 222. When arranging multiple flow passages on the enclosure plate 22, it is necessary to ensure that the circumferential force distribution of the oil-gas separation mechanism is uniform during exhaust to avoid affecting the stability of the rotor 3's rotation.

[0063] like Figure 4 and Figure 5 As shown, the inner diameter of the plate 11 is denoted as D1, and the inner diameter of the surrounding plate 22 is denoted as D2. D2-D1≥1mm. This difference in inner diameter ensures the existence of the exhaust gap 5, so as to achieve rectification and noise reduction of high-pressure gas.

[0064] Furthermore, the total cross-sectional area of ​​the flow passages of rotor 3 is S, and S must satisfy the following relationship with D1 and D2: in, The cross-sectional area of ​​the exhaust gap 5 should not be too small or too large. If the cross-sectional area of ​​the exhaust gap 5 is too small, it will easily lead to excessive exhaust resistance of the oil-gas separation mechanism, reducing the working efficiency of the rotor compressor; if the cross-sectional area of ​​the exhaust gap 5 is too large, it will cause the oil-gas separation mechanism to lose its function of rectifying and silencing high-pressure gas.

[0065] Furthermore, the outer diameter D3 of the enclosure 22 is smaller than the maximum outer diameter of the rotor 3. This arrangement can avoid the impact of the oil-gas separation mechanism on the clearance inspection of the stator and rotor.

[0066] like Figure 2-4 As shown, in another specific embodiment of the present invention, a first connecting hole 131 passing through vertically is provided on the balance block 12 at intervals, and a second connecting hole 141 passing through vertically is provided at the center of the positioning post 14; a third connecting hole 211 and a positioning hole 212 are provided on the end plate 21 at intervals along the circumference of the central hole 213. The number of positioning holes 212 is the same as the number of positioning posts 14, and the two correspond one-to-one. A positioning post 14 is inserted into each positioning hole 212, thereby realizing the accurate positioning of the upper windshield 2 and the oil baffle 1, ensuring that the first flow hole 221 is distributed on the outside of the oil baffle surface 121 of the balance block, and the second flow hole 222 is distributed on the outside of the oil baffle surface 111 of the plate. When assembling the oil-gas separation mechanism on the upper end face of the rotor 3, the first bolt can be passed sequentially through the first connecting hole 131, the third connecting hole 211, and the first mounting hole in the rotor 3. Then, the second bolt can be passed sequentially through the second connecting hole 141, the positioning hole 212, and the second mounting hole in the rotor 3, thereby achieving relative fixation between the oil-gas separation mechanism and the upper end face of the rotor 3. After assembly, the positioning post 14 can support the oil baffle 1, making the structure of the oil-gas separation mechanism more stable. Preferably, the first connecting hole 131 penetrates the protrusion 13.

[0067] Furthermore, such as Figure 1 As shown, a lower windshield 4 and a lower balance block are also provided on the lower end face of the rotor 3. The balance block 12 and the lower balance block are arranged opposite each other. The two work together to better balance the eccentric mass generated by the rotation of the rotor 3, making the rotor 3 run more smoothly and improving the stability of the rotor compressor operation.

[0068] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An oil-gas separation mechanism for a rotary compressor, characterized in that, include: The upper windshield (2) includes an end plate (21) and a surrounding plate (22) disposed on the outer periphery of the end plate (21). The end plate (21) is disposed on the upper end surface of the rotor (3) and has a central hole (213) at its center. The surrounding plate (22) extends from the end plate (21) to the side away from the rotor (3). An oil baffle (1) is disposed above the end plate (21) and inside the surrounding plate (22), comprising a plate body (11), a balance block (12), and several positioning posts (14). A venting gap (5) is formed between the plate body (11) and the surrounding plate (22). A through hole (151) communicating with the central hole (213) is provided at the center of the plate body (11). The balance block (12) and several positioning posts (14) are distributed circumferentially at intervals at the bottom of the plate body (11) along the through hole (151), and together with the end plate (21), they are connected to the upper end face of the rotor (3). The oil baffle surface of the oil baffle (1) includes a plate body oil baffle surface (111) disposed at the bottom of the plate body (11) and a balance block oil baffle surface (121) disposed at the bottom of the balance block (12). The enclosure plate (22) is also provided with a first flow hole (221) and a second flow hole (222). The first flow hole (221) is distributed on the outside of the oil-blocking surface (121) of the balance block, and the second flow hole (222) is distributed on the outside of the oil-blocking surface (111) of the plate body. The second flow hole (222) is higher than the first flow hole (221).

2. The oil-gas separation mechanism according to claim 1, characterized in that, A gap is formed between the oil-blocking surface (121) of the balance block and the upper surface of the end plate (21).

3. The oil-gas separation mechanism according to claim 2, characterized in that, The oil-blocking surface (121) of the balance block is also provided with several protrusions (13) that abut against the upper surface of the end plate (21).

4. The oil-gas separation mechanism according to claim 1, characterized in that, The top of the second flow hole (222) is higher than the oil baffle surface (111) of the plate, and the height difference L2 between the two is greater than 1 mm.

5. The oil-gas separation mechanism according to claim 1, characterized in that, The height L3 of the second flow passage (222) is in the range of 1mm≤L3≤10mm.

6. The oil-gas separation mechanism according to claim 1, characterized in that, The inner diameter of the plate (11) is D1, and the inner diameter of the surrounding plate (22) is D2, where D2-D1≥1mm.

7. The oil-gas separation mechanism according to claim 6, characterized in that, The rotor (3) is provided with a plurality of rotor flow holes extending along its own axial direction. The rotor flow holes penetrate the upper and lower end faces of the rotor (3), and the central hole (213) is connected to the rotor flow holes.

8. The oil-gas separation mechanism according to claim 7, characterized in that, The sum of the cross-sectional areas of the plurality of rotor flow passages is S.

9. The oil-gas separation mechanism according to claim 1, characterized in that, The outer diameter D3 of the enclosure plate (22) is smaller than the maximum outer diameter of the rotor (3).

10. A rotary compressor, characterized in that, Includes the oil-gas separation mechanism as described in any one of claims 1-9.

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