Oil return flow splitting structure of compressor and compressor

Abstract

The present disclosure provides a compressor oil return diversion structure and a compressor, the compressor oil return diversion structure, comprising: an oil return pipe and a diversion frame, the diversion frame has a cavity inside, one end of the oil return pipe can pass through the diversion frame to introduce oil into the cavity, the diversion frame comprises a spiral frame, the spiral frame is arranged in the cavity, the spiral frame comprises at least one spirally extending spiral sheet, the spiral sheet divides the cavity into at least one spiral groove channel, the spiral groove extends spirally from top to bottom, so that the oil entering the cavity is discharged through the spiral groove. According to the present disclosure, the lubricating oil can be effectively diverted, the flow rate can be reduced, the impact of the flowing oil on the oil pool liquid surface can be reduced, the splashing of the lubricating oil can be prevented to cause the exhaust gas to contain oil, the lubricating oil can be separated from the refrigerant, the oil content of the compressor exhaust gas can be effectively reduced, and the oil supply rate can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to an oil return splitting structure of a compressor and a compressor. Background Art

[0002] Since the scroll compressor has high requirements for sealing and lubrication during operation, sufficient lubricating oil is required to keep it sealed and lubricated. The existing vertical scroll compressor uses a crankshaft oil pump to draw the lubricating oil from the oil pool at the bottom of the compressor to the upper part of the compressor for lubrication, and returns it through the lubricating oil return structure of the upper bracket. When the return oil pipe is used for reflux, the flow rate in the pipe is directly related to the oil flow rate. As the operating frequency of the compressor increases, the oil flow rate increases, which will cause the return oil pipe to flow too fast, causing the bottom oil pool to be greatly impacted, and the lubricating oil splashes into the lower chamber of the motor and enters the refrigerant cycle, which increases the oil content of the compressor exhaust, affects the performance of the compressor, and reduces the efficiency of the compressor.

[0003] Since the existing compressors in the prior art have the problem that when the oil returns to the oil pool, the liquid surface is impacted and splashes, which causes the compressor exhaust to contain oil, and the refrigerant carries the oil into the refrigerant circulation, which increases the oil content of the refrigerant, reduces the oil pool liquid level, and cannot play a normal and effective oil supply and other technical problems, the present invention studies and designs a compressor return oil diversion structure and a compressor.

[0004] Public Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that when the oil pool of the compressor is returned to the oil pool, the liquid level is impacted, resulting in oil in the compressor exhaust, which increases the oil content of the refrigerant and reduces the oil pool liquid level, making it impossible to provide normal and effective oil supply, thereby providing a compressor return oil diversion structure and a compressor.

[0006] In order to solve the above problems, the present disclosure provides a return oil splitting structure of a compressor, which comprises:

[0007] An oil return pipe and a diverter frame, wherein the diverter frame has a cavity inside, and one end of the oil return pipe can pass through the diverter frame to guide the oil into the cavity. The diverter frame includes a spiral frame, which is arranged in the cavity. The spiral frame includes at least one spirally extending spiral sheet, which divides the cavity into at least one spiral groove channel, and the spiral groove extends in a spiral shape from top to bottom, so that the oil entering the cavity is discharged through the spiral groove.

[0008] In some embodiments, the lower end of the oil return pipe is opposite to the spiral groove, and a preset distance is spaced between the lower end of the oil return pipe and the top of the spiral groove so that oil can be supplied to the spiral groove through the lower end of the oil return pipe; and / or, a vent hole is provided at the top of the diverter rack, and the vent hole can connect the cavity with the space above the vent hole.

[0009] In some embodiments, the spiral groove includes a first spiral groove and a second spiral groove, the first spiral groove and the second spiral groove extend in the same direction and both extend to the bottom end of the diverter rack; the top end of the first spiral groove is partially opposite to the lower end of the oil return pipe, and the top end of the second spiral groove is also partially opposite to the lower end of the oil return pipe.

[0010] In some embodiments, in the longitudinal cross-section of the spiral sheet, the spiral surface formed by the spiral sheet is inclined at an angle to the horizontal plane, so that the height of the radially outer position of the same spiral sheet is lower than the height of the radially inner position; a diverter groove is provided on the peripheral wall of the diverter frame, and the diverter groove can connect the spiral groove to the outside of the diverter frame.

[0011] In some embodiments, the extension direction of the diverter groove is along the vertical direction; and / or the inclination angle is 2°-15°.

[0012] In some embodiments, the bottom of the flow dividing frame has a lower opening, and the lower opening is connected to the spiral groove to guide the fluid in the spiral groove out:

[0013] The flow direction of the fluid at the bottom of the spiral groove forms an inclination angle that is not 0° with the vertical direction; and / or the flow direction of the fluid at the bottom of the spiral groove is along the tangent direction of the inner wall of the diverter frame.

[0014] In some embodiments, the diverter rack includes a center tube, which is arranged in the cavity. The center tube is located radially inward of the spiral groove and extends along the axial direction of the diverter rack. A diverter hole is opened on the peripheral wall of the center tube, which can introduce the fluid outside the center tube into the interior of the center tube through the diverter hole and discharge it.

[0015] In some embodiments, a through hole is provided inside the central tube along the axial direction of the central tube, the diversion hole is connected to the through hole, the upper end of the through hole is staggered with the lower end of the return oil pipe; the diameter of the through hole is larger than the inner diameter of the return oil pipe.

[0016] In some embodiments, there are multiple diversion holes, which are evenly distributed on the peripheral wall of the central tube; and / or, the outer peripheral wall of the central tube is fixedly connected to the radial inner side of the spiral sheet.

[0017] In some embodiments, a central tube fixing frame is further provided on the central tube, and the central tube fixing frame can be extended to be connected to the diverter frame;

[0018] The central tube fixing frame extends in the radial direction to be connected with the inner wall of the diverter frame; and / or, there are a plurality of central tube fixing frames, and the plurality of central tube fixing frames are arranged at intervals along the circumference of the central tube.

[0019] In some embodiments, it further includes an oil return pipe fixing flange, wherein the oil return pipe fixing flange is disposed in the cavity and can fix the lower end of the oil return pipe; and / or,

[0020] It also includes a splitter frame fixing flange, which is connected and fixed to the outer peripheral wall of the splitter frame. The splitter frame can be fixed to the lower bracket of the compressor through the splitter frame fixing flange.

[0021] The present disclosure further provides a compressor, which includes the oil return diversion structure of any of the preceding compressors, wherein the compressor further includes an upper bracket, and the oil return pipe can drain lubricating oil from the upper bracket.

[0022] The oil return splitting structure of a compressor and the compressor provided by the present disclosure have the following beneficial effects:

[0023] 1. The present invention provides an oil return diversion structure including an oil return pipe and a diversion frame, wherein the diversion frame includes a cavity and a spiral frame located in the cavity, wherein the spiral frame includes at least one spiral sheet and extends to form at least one spiral groove structure from top to bottom, so that the lubricating oil of the compressor can be introduced into the spiral groove in the cavity through the oil return pipe, and move from top to bottom along the spiral groove, thereby being able to effectively divert the lubricating oil, reduce the flow rate, reduce the impact of the flowing oil on the oil pool liquid surface, prevent the lubricating oil from splashing and causing the exhaust gas to contain oil, so that the lubricating oil and the refrigerant are separated, effectively reducing the oil content rate of the compressor exhaust gas, ensuring that the normal liquid level of the oil pool will not be reduced or the degree of reduction is reduced, and improving the oil supply rate;

[0024] 2. The present invention also has a radially outer side of the spiral blade at a lower height than a radially inner side, and a diverter groove is provided on the peripheral wall of the diverter frame, so that the oil diverted from the spiral groove can be discharged from the diverter groove to the outside of the diverter frame obliquely downward to enter the oil pool, which can prevent the oil pool from directly impacting the oil pool liquid surface downward, and can prevent the oil pool from splashing, thereby further reducing the exhaust oil content; the present invention also has a structure of the spiral blade at the bottom of the diverter frame, which can make the oil at the bottom discharge the diverter frame from the lower opening in a non-vertically downward direction, and can further prevent the oil pool from directly impacting the oil pool liquid surface downward, and can prevent the oil pool from splashing, thereby further reducing the exhaust oil content;

[0025] 3. The present invention also enables, through the arrangement of the center tube, when the amount of oil return is large, the oil in the spiral groove to be introduced into the center tube through the diversion hole of the center tube and discharged through the center tube, which can facilitate the rapid discharge of the lubricating oil into the oil pool, and the diameter of the center tube is larger than the oil return pipe, which can reduce the flow rate, reduce the impact on the oil pool, and reduce the splashing of the oil pool; the top of the center tube of the present invention is arranged at a distance from the lower end of the oil return pipe, which can enable the oil to be introduced through the top of the center tube and directly discharged downward when the oil flow is too large and exceeds the oil discharge capacity of the spiral groove, which is conducive to rapid discharge of the oil;

[0026] 4. The outlet of the oil return pipe is located just above the starting position of the first spiral groove and is partially blocked by the first spiral groove. After passing through the starting position of the first spiral groove, the lubricating oil is divided into two parts, one part flows along the first spiral groove, and the other part falls into the second spiral groove to flow, so as to increase the oil separation amount, improve the oil separation rate, improve the effect of preventing oil splashing in the oil pool, and further reduce the oil content of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The three-dimensional structure of the oil return splitter structure of the compressor disclosed in the present invention Figure 1 ;

[0028] Figure 2 The three-dimensional structure of the oil return splitter structure of the compressor disclosed in the present invention Figure 2 ;

[0029] Figure 3 It is an exploded structural diagram of the oil return diversion structure of the compressor disclosed in the present invention and the assembly of the lower bracket;

[0030] Figure 4 is an internal cross-sectional view of the oil return splitting structure of the compressor disclosed in the present invention;

[0031] Figure 5 is an internal cross-sectional view of a compressor of the present disclosure.

[0032] The reference numerals are as follows:

[0033] 1. Lower cover; 2. Shell; 3. Lower support ring; 4. Rotor; 5. Stator; 6. Oil equalizing pipe; 7. Main balance block; 8. Exhaust pipe; 9. Sealing ring; 10. Upper cover; 11. Intake pipe; 12. Stationary scroll; 13. Moving scroll; 14. Cross slip ring; 15. Upper bracket; 16. Crankshaft; 17. Secondary balance block; 18. Lower bracket; 19. Oil pump; 201. Oil return pipe; 202. Manifold; 202 a, spiral frame; 202b, center tube; 202a1, first spiral groove; 202a2, second spiral groove; 202a3, diverter groove; 202a4, return oil pipe fixing flange; 202a5, diverter frame fixing flange; 202a6, diverter frame upper cover; 202a7, vent; 202b, center tube; 202b1, center tube body; 202b2, diverter hole; 202b3, center tube fixing frame. DETAILED DESCRIPTION

[0034] like Figure 1-5 As shown, the present disclosure provides a return oil splitting structure of a compressor, which includes:

[0035] An oil return pipe 201 and a diverter frame 202, wherein the diverter frame 202 has a cavity inside, and one end of the oil return pipe 201 can pass through the diverter frame 202 to introduce oil into the cavity, and the diverter frame 202 includes a spiral frame 202a, and the spiral frame 202a is arranged in the cavity, and the spiral frame 202a includes at least one spirally extending spiral sheet, and the spiral sheet divides the cavity into at least one spiral groove channel, and the spiral groove extends in a spiral shape from top to bottom, so that the oil entering the cavity is discharged through the spiral groove. The present invention provides an oil return diversion structure including an oil return pipe and a diversion frame, wherein the diversion frame includes a cavity and a spiral frame located in the cavity, wherein the spiral frame includes at least one spiral sheet and extends to form at least one spiral groove structure from top to bottom, so that the lubricating oil of the compressor can be introduced into the spiral groove in the cavity through the oil return pipe, and move from top to bottom along the spiral groove, thereby being able to effectively divert the lubricating oil, reduce the impact of the flowing oil on the liquid surface of the oil pool, prevent the lubricating oil from splashing and causing the exhaust gas to contain oil, separate the lubricating oil from the refrigerant, effectively reduce the oil content rate of the compressor exhaust gas, ensure that the normal liquid level of the oil pool will not decrease or reduce the degree of decrease, and improve the oil supply rate.

[0036] In order to enhance the lubricating oil return capacity of the compressor, reduce the exhaust oil content of the compressor and reduce the impact on the oil pool, the present invention discloses a vertical scroll compressor and its lubricating oil return diversion mechanism, which is composed of a return oil pipe and a diversion rack, the return oil pipe inlet cooperates with the compressor upper bracket to isolate the return lubricating oil from the refrigerant; the diversion rack is connected to the outlet of the return oil pipe, and the lubricating oil is diverted to multiple outlets in the diversion rack to slow down its flow rate and change the flow direction, so that the lubricating oil can flow back to the bottom oil pool relatively smoothly.

[0037] 1. The present invention uses multi-layer spiral grooves to guide the flow and divides the flow multiple times during the flow process, so that a large flow of lubricating oil can be smoothly returned to the oil pool to prevent splashing due to impact on the liquid surface, which is conducive to maintaining the stability of the oil pool liquid level and oil volume;

[0038] 2. The present invention isolates the lubricating oil from the high-speed moving refrigerant during the oil return process, and sets the lubricating oil outlet below the lower support ring (lower bracket), thereby preventing the lubricating oil from entering the refrigerant circulation, which is beneficial to reducing the oil content of the refrigerant gas.

[0039] With the scroll compressor adopting the structure disclosed in the present invention, the lubricating oil in the upper bracket can stably return to the oil pool, avoiding the oil supply problem caused by insufficient oil in the oil pool, making the operation of the compressor more stable; the present invention can make the oil gradually be diverted during the reflux process, avoiding the phenomenon that a large amount of high-speed fluid directly impacts the oil pool and causes oil droplets to splash and enter the refrigerant gas, avoiding the increase of the oil content of the refrigerant, and improving the efficiency of the air-conditioning system.

[0040] In some embodiments, the lower end of the oil return pipe 201 is opposite to the spiral groove, and the lower end of the oil return pipe 201 is spaced a preset distance from the top of the spiral groove, so that oil can be supplied to the spiral groove through the lower end of the oil return pipe 201; and / or, a vent hole 202a7 is provided at the top of the diverter rack 202, and the vent hole 202a7 can connect the cavity with the space above the vent hole. The present disclosure directs the oil falling from the oil return pipe into the spiral groove by placing the lower end of the oil return pipe opposite to the spiral groove, and spirally moves downward along the spiral groove, thereby reducing the flow speed and the impact on the oil pool surface. The lower end of the oil return pipe is spaced a preset distance from the top of the spiral groove, which can ensure that the oil can flow down smoothly and facilitate the oil return pipe to flow into multiple spiral grooves, thereby forming a further diversion effect and reducing the impact on the oil pool. The present invention can effectively discharge the gas in the cavity through the vent hole opened at the top of the diverter frame, so as to facilitate the continuous injection of oil in the oil return pipe into the spiral groove.

[0041] In some embodiments, the spiral groove includes a first spiral groove 202a1 and a second spiral groove 202a2, the first spiral groove 202a1 and the second spiral groove 202a2 extend in the same direction and both extend to the bottom end of the diverter frame 202; the top of the first spiral groove 202a1 is partially opposite to the lower end of the return oil pipe 201, and the top of the second spiral groove 202a2 is also partially opposite to the lower end of the return oil pipe 201. The present disclosure can divert the oil falling from the return oil pipe by setting two or even more than two spiral grooves, further reducing the speed of oil flow, so that the oil is divided into a plurality of fine fluids spirally falling downward into the oil pool, reducing the impact force of the oil falling on the oil pool, reducing the splashing of the oil in the oil pool, thereby reducing the splashing oil entering the exhaust refrigerant and causing the oil in the compressor to be reduced. The top of the first spiral groove is opposite to a part of the return oil pipe, and the top of the second spiral groove is opposite to a part of the return oil pipe, so that both spiral grooves can obtain lubricating oil from the return oil pipe, thereby improving the diversion effect.

[0042] like Figure 4 As shown, the outlet of the oil return pipe is located just above the starting position of the first spiral groove and is partially blocked by the first spiral groove. After the lubricating oil passes through the starting position of the first spiral groove, it is divided into two parts, one part flows along the first spiral groove, and the other part falls into the second spiral groove to increase the oil discharge amount;

[0043] In some embodiments, in the longitudinal cross section of the spiral blade, the spiral surface formed by the spiral blade is provided with an inclination angle with the horizontal plane, so that the height of the radially outer position of the same spiral blade is lower than the height of the radially inner position; the shunt groove 202a3 is provided on the peripheral wall of the diverter frame 202, and the shunt groove 202a3 can connect the spiral groove to the outside of the diverter frame 202. The present disclosure also enables the oil diverted from the spiral groove to be discharged obliquely downward from the shunt groove to the outside of the diverter frame through the shunt groove by making the radially outer position height of the spiral blade lower than the radially inner position height and the shunt groove provided on the peripheral wall of the diverter frame, so as to enter the oil pool, thereby preventing the oil pool from directly impacting the oil pool liquid surface downward, preventing the oil pool from splashing, and further reducing the exhaust oil content.

[0044] The spiral rack disclosed in the present invention is a shell component containing a spiral body inside, with a gap at the top to balance the air pressure, a lubricating oil outflow outlet at the bottom, and a diversion groove at the side to achieve stable oil return and reduce the impact of the return oil on the oil pool, so as to keep the oil pool liquid level stable; the central tube is a tubular component with a diversion hole at the side, and the bottom is fixed to the bottom of the spiral rack through a spoke structure, so as to form an oil return passage together with the spiral rack to prevent the oil from flowing across the spiral groove;

[0045] In some embodiments, the extension direction of the diverter groove 202a3 is along the vertical direction; and / or, the inclination angle is 2°-15°. This is the preferred structural form of the diverter groove of the present disclosure. The diverter groove extending in the vertical direction can be connected with multiple spiral grooves in the vertical direction, so that the oil moving downward in the spiral is divided into multiple small streams flowing downward in an inclined manner, reducing the impact of the large flow of oil falling on the oil pool and reducing the splashing of the oil in the oil pool; the inclination angle is preferably in the range of 2-15° to form a gentle slope so that the oil flows down toward the oil pool, further reducing the impact force on the oil pool.

[0046] Preferably, in order to improve the diversion efficiency, the cross-section of the spiral groove is set with an inclination angle of 2-15° to facilitate the lubricating oil to flow out from the diversion groove on the side of the diversion frame; when the oil flow is large, the diversion hole on the side wall of the center tube can discharge the oil through the center tube.

[0047] In some embodiments, the bottom of the flow dividing frame 202 has a lower opening, and the lower opening is connected to the spiral groove to guide the fluid in the spiral groove out:

[0048] The flow direction of the fluid at the bottom of the spiral groove forms an inclination angle that is not 0° with the vertical direction; and / or the flow direction of the fluid at the bottom of the spiral groove is along the tangent direction of the inner wall of the diverter frame 202 .

[0049] By setting the lower opening at the bottom of the diverter rack, the oil in the spiral groove can flow down toward the oil pool through the lower opening when it flows to the bottom of the diverter rack, and the flow direction of the fluid at the bottom of the spiral groove forms an inclination angle of not 0° with the vertical direction, so that the oil at the bottom can be discharged from the diverter rack from the lower opening in a direction not vertically downward, and the oil pool can be further prevented from directly impacting the oil pool liquid surface downward, and the oil pool can be prevented from splashing, thereby further reducing the exhaust oil content; the flow direction of the fluid at the bottom of the spiral groove is along the tangent direction of the inner wall of the diverter rack 202, such as Figure 4 As shown, it falls inward or outward directions perpendicular to the paper surface, which can further prevent the oil pool from directly impacting the oil pool liquid surface downward, and can prevent the oil pool from splashing.

[0050] To reduce the impact on the oil pool, the direction of the outlet at the bottom of the spiral groove should be tangent to the compressor casing, so that the discharged oil moves in a circular motion along the casing to avoid the lubricating oil directly hitting the casing and causing splashing.

[0051] In some embodiments, the flow splitter 202 includes a central tube 202b, which is disposed in the cavity, is located radially inward of the spiral groove, and extends along the axial direction of the flow splitter 202, and a flow splitter hole 202b2 is provided on the peripheral wall of the central tube 202b, which can introduce the fluid outside the central tube 202b into the interior of the central tube 202b through the flow splitter hole 202b2 and discharge it. The present disclosure also enables the oil in the spiral groove to be introduced into the interior of the central tube through the flow splitter hole of the central tube when the return oil volume is large, and to be discharged through the central tube, which can facilitate the rapid discharge of the lubricating oil into the oil pool.

[0052] In some embodiments, the center tube 202b is provided with a through hole opened along the axial direction of the center tube 202b, the diverter hole 202b2 is connected to the through hole, the upper end of the through hole is staggered with the lower end of the oil return pipe 201; the diameter of the through hole is larger than the inner diameter of the oil return pipe 201. The through hole provided inside the center tube of the present disclosure can accommodate the oil flowing from the spiral groove through the diverter hole, and then discharged from the bottom end of the through hole; the staggered arrangement of the upper end of the through hole and the lower end of the oil return pipe can effectively prevent the oil in the oil return pipe from directly falling into the center tube, preventing the inability to play an effective spiral diversion role; and the diameter of the center tube is larger than the oil return pipe, which can reduce the flow rate, reduce the impact on the oil pool, and reduce the degree of splashing of the oil pool.

[0053] Preferably, the distance between the top of the center tube and the outlet of the oil return pipe is more than 3 mm. When the oil flow is too large and exceeds the oil discharge capacity of the spiral groove, it can be discharged directly downward from the top of the center tube. Since the diameter of the center tube is larger than the oil return pipe, the outlet flow rate is weakened and the impact on the oil pool is reduced.

[0054] In some embodiments, there are multiple diverter holes 202b2, which are evenly distributed on the peripheral wall of the center tube 202b; and / or, the outer peripheral wall of the center tube 202b is fixedly connected to the radial inner side of the spiral sheet. This is the preferred structural form of the diverter holes disclosed in the present invention. The multiple diverter holes can increase the flow rate from the spiral groove to the inner through hole of the center tube to cope with the situation where the oil cannot be discharged in time when the flow rate is large; the outer peripheral wall of the center tube is preferably fixedly connected to the radial inner side of the spiral sheet, and the center tube is preferably clamped into the center of the spiral sheet so that the center tube can play a role in draining the oil in the spiral groove and prevent the oil from falling directly from the spiral groove along the center. The diverter holes of the center tube can further play a role in slowing down the oil, further reducing the impact of the oil on the oil pool.

[0055] In some embodiments, a central tube fixing frame 202b3 is further provided on the central tube 202b, and the central tube fixing frame 202b3 can be extended to connect with the diverter frame 202;

[0056] The central tube fixing frame 202b3 extends in the radial direction to connect with the inner wall of the diverter frame 202; and / or, there are multiple central tube fixing frames 202b3, and the multiple central tube fixing frames 202b3 are arranged at intervals along the circumference of the central tube 202b.

[0057] The present invention can effectively fix the center tube to the diverter frame by setting up a center tube fixing frame; the preferred structure of the center tube fixing frame is to be set at the bottom of the center tube and extend in the radial direction to be fixedly connected to the diverter frame, preferably by welding; the fixing effect of the center tube can be improved by using multiple center tube fixing frames.

[0058] In some embodiments, it further includes an oil return pipe fixing flange 202a4, wherein the oil return pipe fixing flange 202a4 is disposed in the cavity and can fix the lower end of the oil return pipe 201; and / or,

[0059] It also includes a splitter frame fixing flange 202a5, which is connected and fixed to the outer peripheral wall of the splitter frame 202. The splitter frame 202 can be fixed to the lower bracket 18 of the compressor through the splitter frame fixing flange 202a5.

[0060] The present invention can effectively fix the lower end of the oil return pipe through the oil return pipe fixing flange, and can effectively fix the splitter frame to the lower bracket inside the compressor through the splitter frame fixing flange.

[0061] The present disclosure further provides a compressor (preferably a scroll compressor), which includes the oil return diversion structure of any of the preceding compressors, wherein the compressor further includes an upper bracket 15 , and the oil return pipe 201 can drain lubricating oil from the upper bracket 15 .

[0062] The present invention provides a scroll compressor lubricating oil return and diversion mechanism, comprising an oil return pipe and a diversion frame; the oil return pipe is a right-angle elbow pipe, the inlet of which is connected to the oil return hole of the compressor upper bracket, and the outlet is connected to the diversion frame, so that the return oil of the compressor completely enters the diversion frame; the diversion frame is composed of a spiral frame and a center pipe, such as Figure 3 As shown, the flow splitter is installed under the lower bracket to isolate the flow splitting process from the refrigerant in the motor lower chamber, preventing the lubricating oil from splashing into the motor lower chamber;

[0063] The oil return flow splitting mechanism disclosed in the present invention comprises an oil return pipe 201 and a flow splitting frame 202. The flow splitting frame 202 is composed of a spiral frame 202a and a central pipe 202b. The specific structure is described as follows:

[0064] The oil return pipe 201 is a right-angle elbow pipe, the inlet of which is installed at the oil return hole of the upper bracket 15, and the outlet passes through the manifold upper cover 202a6 and is installed at the oil return pipe fixing flange 202a4 to ensure that the return lubricating oil can completely enter the manifold;

[0065] The spiral frame 202a is the main part of the flow splitter frame 202, which is used to fix the flow splitter frame 202 and split the return oil. It contains two fixing flanges 202a5 and 202a4, a non-completely enclosed upper cover 202a6 on the upper part, a splitter groove 202a3 on the side, and two first spiral grooves 202a1 and second spiral grooves 202a2 in the same direction extending to the bottom surface of the spiral frame 202a. The starting position of the first spiral groove should partially block the outlet of the return oil pipe so that the oil is split and flows into the two spiral grooves. The cross section of the spiral groove has an inclination angle of 2-15°, which is used to guide the oil to the splitter groove, and the outflow direction of the bottom of the spiral groove is tangent to the compressor housing.

[0066] The center tube 202b is welded to the bottom of the spiral frame 202a through the fixing frame 202b3, and its tube body 202b1 extends into the spiral frame 202a. The top of the tube body 202b1 is at least 3mm lower than the outlet of the return oil pipe. The side wall of the tube body is provided with a diversion hole 202b2, which can also be used for diversion during the flow process.

[0067] refer to Figure 3 The specific operation mode of the present disclosure is described as follows:

[0068] When the compressor is running, the oil pump 19 supplies oil to the upper bracket 15 through the oil hole in the center of the crankshaft 16. A small amount of lubricating oil enters the back pressure chamber through the sealing ring 9 to lubricate the fixed scroll 12, the movable scroll 13 and the cross ring 14. The remaining lubricating oil enters the oil return pipe 201 through the oil return hole of the upper bracket 15 and flows back. After the lubricating oil at the outlet of the return oil pipe 201 enters the diverter rack 202, it is first diverted at the starting position of the first spiral groove 202a1, and is divided into a part flowing along the first spiral groove 202a1 and a part flowing down to the second spiral groove 202a2; then the lubricating oil flows along the two spiral grooves respectively, and gathers on the outside of the spiral groove due to the inclination angle of the spiral groove; when the lubricating oil flows to the opening of the diverter groove 202a3, it will be diverted again, and part of the lubricating oil will flow out of the diverter groove and enter the oil pool along the outer wall of the diverter rack 202; at the same time, on the inner side of the spiral groove, when the liquid level of the lubricating oil is higher than the diverter hole 202b2, it will be diverted from the diverter hole 202b2 to the center pipe 202b, and enter the oil pool from the lower outlet of the center pipe 202b; when the lubricating oil reaches the bottom of the diverter rack 202 after being diverted on both sides, it flows into the oil pool along the tangent direction of the two spiral grooves to avoid directly impacting the bottom of the oil pool.

[0069] In order to prevent the lubricating oil from splashing out when entering the manifold 202, the manifold upper cover 202a6 is used as a baffle. At the same time, in order to ensure the air pressure balance, the manifold upper cover 202a6 has an opening (i.e., a vent hole 202a7) on the side close to the oil return pipe. Figure 1 As shown; during the diversion process, in order to prevent splashing caused by excessive flow at the diversion groove 202a3, a smaller diversion groove width should be used so that the diversion groove 202a3 can divert the lubricating oil multiple times with small flow rates during the flow process; when the oil flow is too large and exceeds the oil discharge capacity of the first spiral groove 202a1 and the second spiral groove 202a2, the oil level in the diversion frame 202 will rise, and the lubricating oil can be discharged through the through hole in the center of the central tube 202b. The diameter of the through hole should be larger than the inner diameter of the return oil pipe 201, so that the flow rate of the lubricating oil is reduced and the impact on the oil pool is weakened.

[0070] The above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. The above is only a preferred implementation of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present disclosure, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A compressor oil return splitting structure, characterized in that: include: An oil return pipe (201) and a flow divider (202), wherein the flow divider (202) has a cavity inside, one end of the oil return pipe (201) can pass through the flow divider (202) to guide oil into the cavity, the flow divider (202) comprises a spiral frame (202a), the spiral frame (202a) is arranged in the cavity, the spiral frame (202a) comprises at least one spirally extending spiral sheet, the spiral sheet divides the cavity into at least one spiral groove channel, the spiral groove extends in a spiral shape from top to bottom, so that the oil entering the cavity is discharged through the spiral groove; The flow splitter frame (202) comprises a central tube (202b), the central tube (202b) being arranged in the cavity, the central tube (202b) being located radially inward of the spiral groove and extending along the axial direction of the flow splitter frame (202), and a flow splitter hole (202b2) being provided on the peripheral wall of the central tube (202b), so that the fluid outside the central tube (202b) can be introduced into the interior of the central tube (202b) through the flow splitter hole (202b2) and discharged.

2. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: The lower end of the oil return pipe (201) is opposite to the spiral groove, and a preset distance is provided between the lower end of the oil return pipe (201) and the top of the spiral groove, so that oil can be supplied to the spiral groove through the lower end of the oil return pipe (201); and / or, a vent hole (202a7) is provided at the top end of the flow dividing frame (202), and the vent hole (202a7) can connect the cavity with the space above the vent hole.

3. The oil return flow splitting structure of the compressor according to claim 1 or 2, characterized in that: The spiral groove comprises a first spiral groove (202a1) and a second spiral groove (202a2); the first spiral groove (202a1) and the second spiral groove (202a2) extend in the same direction and both extend to the bottom end of the flow dividing frame (202); the top end of the first spiral groove (202a1) is partially opposite to the lower end of the oil return pipe (201), and the top end of the second spiral groove (202a2) is also partially opposite to the lower end of the oil return pipe (201).

4. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: In the longitudinal cross section of the spiral sheet, the spiral surface formed by the spiral sheet is provided with an inclination angle with the horizontal plane, so that the height of the radially outer position of the same spiral sheet is lower than the height of the radially inner position; a diverter groove (202a3) is provided on the peripheral wall of the diverter frame (202), and the diverter groove (202a3) can connect the spiral groove to the outside of the diverter frame (202).

5. The oil return flow splitting structure of the compressor according to claim 4, characterized in that: The extension direction of the diversion groove (202a3) is along the vertical direction; and / or the inclination angle is 2°-15°.

6. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: The bottom of the flow dividing frame (202) has a lower opening, and the lower opening is connected to the spiral groove to guide the fluid in the spiral groove out: The flow direction of the fluid at the bottom of the spiral groove forms an inclination angle that is not 0° with the vertical direction; and / or the flow direction of the fluid at the bottom of the spiral groove is along the tangent direction of the inner wall of the flow dividing frame (202).

7. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: A through hole is provided inside the central tube (202b) and is opened along the axial direction of the central tube (202b); the flow diversion hole (202b2) is connected to the through hole; the upper end of the through hole and the lower end of the oil return pipe (201) are staggered; and the diameter of the through hole is larger than the inner diameter of the oil return pipe (201).

8. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: There are a plurality of diversion holes (202b2) which are evenly distributed on the peripheral wall of the central tube (202b); and / or the outer peripheral wall of the central tube (202b) is fixedly connected to the radial inner side of the spiral sheet.

9. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: The central tube (202b) is also provided with a central tube fixing frame (202b3), and the central tube fixing frame (202b3) can be extended to be connected to the flow dividing frame (202); The central tube fixing frame (202b3) extends in a radial direction to connect with the inner wall of the flow dividing frame (202); and / or, there are multiple central tube fixing frames (202b3), and the multiple central tube fixing frames (202b3) are arranged at intervals along the circumference of the central tube (202b).

10. The oil return flow splitting structure of the compressor according to claim 1, characterized in that: It also includes an oil return pipe fixing flange (202a4), wherein the oil return pipe fixing flange (202a4) is arranged in the cavity and can fix the lower end of the oil return pipe (201); and / or, It also comprises a flow splitter frame fixing flange (202a5), wherein the flow splitter frame fixing flange (202a5) is connected and fixed to the outer peripheral wall of the flow splitter frame (202), and the flow splitter frame (202) can be fixed to the lower bracket (18) of the compressor through the flow splitter frame fixing flange (202a5).

11. A compressor, characterized in that: The oil return diversion structure of the compressor comprises any one of claims 1 to 10, wherein the compressor further comprises an upper bracket (15), and the oil return pipe (201) is capable of draining lubricating oil from the upper bracket (15).

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