A return oil assembly, compressor

Abstract

The application provides an oil return assembly and a compressor. The oil return assembly comprises an oil return pipe and a pipe sleeve. The oil return pipe has an inlet end and an outlet end. The inlet end is used for communicating with an oil return channel of the compressor. The pipe sleeve is sleeved on the oil return pipe, and the outlet end is located in the pipe sleeve. The pipe sleeve has an oil outlet through which lubricating oil can be delivered to an oil pool of the compressor. An oil delivery channel is formed between the inner wall of the pipe sleeve and the outlet end. According to the liquid level of the oil pool, the pipe sleeve can move along the axial direction of the oil return pipe, so that the cross-sectional area of the oil delivery channel is increased or decreased. According to the application, the diameter of the outlet of the oil return pipe is fixed in the prior art, the oil delivery amount cannot be adjusted according to the operating frequency of the compressor, the performance of the compressor is reduced, and the reliability of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the compressor technical field, specifically relates to a kind of oil return assembly, compressor. BACKGROUND

[0002] The lubricating oil that scroll compressor crankshaft is pumped up by oil pump is divided into two parts in high-pressure chamber oil pool, one part enters pump body end surface and is lubricated, to ensure that compressor normal operation, another part of lubricating oil is completed bearing lubrication and is returned to the bottom of compressor oil pool by oil return device, i.e.

[0003] The diameter of the outlet of the conventional scroll compressor oil return pipe is fixed, and is affected by the actual operation of the compressor. Since the diameter of the outlet of the oil return pipe is fixed, if the diameter of the outlet of the oil return pipe is based on the oil return amount at high frequency, this will result in excessive oil return amount when the compressor is operated at low frequency, thereby causing the dynamic and static scroll discs to be short of oil. If the diameter of the outlet of the oil return pipe is based on the low frequency or the intermediate value between the low frequency and the high frequency, the oil return amount will be insufficient at high frequency, but the oil pumped up by the oil pump will increase, and then the excess oil will be discharged from the pump body in the form of gas, thereby affecting the oil circulation rate of the compressor and further causing the performance of the compressor to decrease.

[0004] Since the diameter of the outlet of the oil return pipe in the prior art is fixed, the oil discharge amount cannot be adjusted according to the operating frequency of the compressor, which results in the performance of the compressor to decrease, and other technical problems. Therefore, the present application designs an oil return assembly and a compressor. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art, i.e., the diameter of the outlet of the oil return pipe is fixed, the oil discharge amount cannot be adjusted according to the operating frequency of the compressor, and the performance of the compressor decreases, thereby providing an oil return assembly and a compressor.

[0006] In order to solve the above problems, the present application provides an oil return assembly, which comprises:

[0007] The oil return pipe has an inlet end and an outlet end, the inlet end is used to communicate with the oil return channel of the compressor, the pipe sleeve is sleeved on the oil return pipe, and the outlet end is located in the pipe sleeve, the pipe sleeve has an oil outlet, lubricating oil can be delivered to the oil pool of the compressor through the oil outlet, and an oil delivery channel is formed between the inner wall of the pipe sleeve and the outlet end, according to the liquid level of the oil pool, the pipe sleeve can move along the axial direction of the oil return pipe, so as to increase or decrease the cross-sectional area of the oil delivery channel.

[0008] In some embodiments, the outlet end is provided with a first oil outlet piece, a through hole is formed in the first oil outlet piece, the through hole is in communication with the oil return pipe, the inner wall of the pipe sleeve is provided with a protrusion, the protrusion is opposite to the through hole, and the oil conveying channel is located between the protrusion and the inner wall of the through hole.

[0009] In some embodiments, the longitudinal section of the first oil outlet piece and the protrusion is a trapezoid, the short side of the trapezoid faces the oil return pipe, and the included angle a between the long side and the oblique side of the trapezoid satisfies 55°<a<85°.

[0010] In some embodiments, the oil outlet is arranged on the outer circumferential wall of the pipe sleeve, the protrusion is arranged on the inner bottom surface of the pipe sleeve, the maximum outer diameter of the first oil outlet piece is the same as the inner diameter of the pipe sleeve, and the maximum outer diameter of the protrusion is not less than the maximum inner diameter of the through hole.

[0011] In some embodiments, the oil return assembly further comprises a fixing plate, the fixing plate is sleeved on the oil return pipe, the fixing plate can move along the axial direction of the oil return pipe, the fixing plate is connected with the pipe sleeve, and the inner diameter of the fixing plate is less than the outer diameter of the outlet end.

[0012] In some embodiments, the oil return assembly further comprises a fixing plate, the fixing plate is sleeved on the oil return pipe, the fixing plate can move along the axial direction of the oil return pipe, the fixing plate is connected with the pipe sleeve, and the inner diameter of the fixing plate is less than the outer diameter of the outlet end.

[0013] In some embodiments, the longitudinal section of the second oil outlet piece and the groove is a trapezoid, the long side of the trapezoid faces the oil return pipe, and the included angle β between the long side and the oblique side of the trapezoid satisfies 50°<β<80°.

[0014] In some embodiments, the oil outlet is located at the groove bottom of the groove, the maximum outer diameter of the second oil outlet piece is the same as the inner diameter of the pipe sleeve, and the maximum outer diameter of the second oil outlet piece is greater than the maximum inner diameter of the groove.

[0015] In some embodiments, the outlet end is provided with a fixing piece, the second oil outlet piece is connected with the fixing piece, and when the oil return assembly further comprises a fixing plate, the outer diameter of the fixing piece is greater than the inner diameter of the fixing plate.

[0016] The application further provides a compressor comprising the oil return assembly according to any one of the preceding.

[0017] The oil return assembly and the compressor provided by the application have the following beneficial effects:

[0018] Because the compressor pumps less oil during low-frequency operation, the oil level in the bottom oil sump is higher. During high-frequency operation, the pump pump increases the oil volume, causing the oil level in the bottom oil sump to drop. The return oil pipe has an inlet and an outlet. The inlet connects to the compressor's return oil channel. After the lubricating oil passes through the compressor's lubrication components, it flows into the return oil pipe through the return oil channel. A sleeve is fitted onto the return oil pipe, and the outlet is located inside the sleeve, which has an oil outlet. The lubricating oil in the return oil pipe can be transported to the compressor's oil sump through the outlet, thus forming a loop for the lubricating oil in the compressor. An oil delivery channel is formed between the inner wall of the sleeve and the outlet. Depending on the oil level in the oil sump, the sleeve can move axially along the return oil pipe to increase or decrease the cross-sectional area of ​​the oil delivery channel. When the compressor operates at low frequency, the oil level in the oil sump... When the oil level is high, the sleeve moves under the buoyancy of the oil, reducing the cross-sectional area of ​​the oil delivery channel and decreasing the oil output from the sleeve outlet. This ensures the lubrication effect of the lubricating components. When the compressor operates at high frequency, the oil level in the oil sump is low, and the weight of the sleeve exceeds the buoyancy it receives. The sleeve moves under gravity, increasing the cross-sectional area of ​​the oil delivery channel and increasing the oil output from the sleeve outlet. This ensures the compressor's oil circulation rate, thereby regulating the oil return volume of the return pipe at various compressor speeds. This prevents problems such as insufficient oil return volume causing excessive oil circulation during high-frequency operation, or excessive oil return volume causing pump oil shortage during low-frequency operation. This achieves stable lubrication of the compressor, improving its performance and reliability to a certain extent. It also significantly improves the matching between the compressor and the system, enhancing the compressor's performance. Attached Figure Description

[0019] Figure 1 This is an assembly diagram of the oil return assembly according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0021] Figure 3 For compressors to operate at low frequencies, Figure 2 An enlarged view of part A in the image;

[0022] Figure 4 For compressors to operate at high frequencies, Figure 2 An enlarged view of part A in the image;

[0023] Figure 5 This is a schematic diagram of the oil return assembly according to an embodiment of the present invention;

[0024] Figure 6 This is an exploded view of the oil return assembly according to an embodiment of the present invention;

[0025] Figure 7A perspective view of the fixed plate in the oil return assembly of the embodiment of the present application;

[0026] Figure 8 A sectional view of the fixed plate in the oil return assembly of the embodiment of the present application;

[0027] Figure 9 A perspective view of the pipe sleeve in the oil return assembly of the embodiment of the present application;

[0028] Figure 10 A sectional view of the pipe sleeve in the oil return assembly of the embodiment of the present application;

[0029] Figure 11 A sectional view of the oil return pipe in the oil return assembly of the embodiment of the present application;

[0030] Figure 12 A structural schematic view of the oil return assembly of another embodiment of the present application;

[0031] Figure 13 An exploded view of the oil return assembly of another embodiment of the present application;

[0032] Figure 14 A perspective view of the second oil outlet in the oil return assembly of another embodiment of the present application;

[0033] Figure 15 A sectional view of the second oil outlet in the oil return assembly of another embodiment of the present application;

[0034] Figure 16 A structural schematic view of the pipe sleeve in the oil return assembly of another embodiment of the present application.

[0035] Reference signs are shown as follows:

[0036] 1, crankshaft; 2, motor; 3, second support; 4, pump body; 5, pipe sleeve; 6, fixed plate; 7, oil return pipe; 71, first oil outlet; 72, second oil outlet; 73, fixed part; 8, first support; 9, moving scroll; 10, stationary scroll; 11, housing. DETAILED DESCRIPTION

[0037] Reference is made to Figures 1 to 16As shown, according to the embodiment of the present application, an oil return assembly is provided, comprising: an oil return pipe 7 having an inlet end and an outlet end, the inlet end being used for communicating with an oil return passage of a compressor, and a pipe sleeve 5 sleeved on the oil return pipe 7, and the outlet end being located in the pipe sleeve 5, the pipe sleeve 5 having an oil outlet through which lubricating oil can be delivered to an oil pool of the compressor, and an oil delivery passage being formed between an inner wall of the pipe sleeve 5 and the outlet end, and the pipe sleeve 5 being movable along an axial direction of the oil return pipe 7 according to a liquid level of the oil pool so as to increase or decrease a cross-sectional area of the oil delivery passage. In this technical solution, when the compressor is operated at a low frequency, the pump body 4 pumps a small amount of oil, and the liquid level of the oil in the bottom oil pool is high; when the compressor is operated at a high frequency, the pump body 4 pumps an increased amount of oil, and the liquid level of the oil in the bottom oil pool starts to decrease, and the liquid level of the oil in the bottom oil pool is low. The oil return pipe 7 has an inlet end and an outlet end, the inlet end being used for communicating with an oil return passage of a compressor, and when lubricating oil passes through lubricating components of the compressor, the lubricating oil flows into the oil return pipe 7 through the oil return passage. The pipe sleeve 5 is sleeved on the oil return pipe 7, and the outlet end is located in the pipe sleeve 5. The pipe sleeve 5 has an oil outlet, and lubricating oil in the oil return pipe 7 can be delivered to an oil pool of the compressor through the oil outlet, so that lubricating oil in the compressor forms a loop. An oil delivery passage is formed between an inner wall of the pipe sleeve 5 and the outlet end, and the pipe sleeve 5 is movable along an axial direction of the oil return pipe 7 according to a liquid level of the oil pool so as to increase or decrease a cross-sectional area of the oil delivery passage. In combination with the accompanying drawings, it can be seen that Figure 3 and Figure 4 When the compressor is operated at a low frequency, the liquid level of the oil in the oil pool is high, the pipe sleeve 5 is displaced under the action of the buoyancy of the oil, the cross-sectional area of the oil delivery passage is decreased, and the oil delivery amount of the oil outlet of the pipe sleeve 5 is also decreased, so as to ensure the lubricating effect of the lubricating components. When the compressor is operated at a high frequency, the liquid level of the oil in the oil pool is low, the gravity of the pipe sleeve 5 is greater than the buoyancy received by the pipe sleeve 5, the pipe sleeve 5 moves under the action of the gravity, the cross-sectional area of the oil delivery passage is increased, and the oil delivery amount of the oil outlet of the pipe sleeve 5 is also increased, so as to ensure the oil circulation rate of the compressor. Therefore, the oil return amount of the oil return pipe 7 at each rotational speed of the compressor is adjusted, the problem of excessive oil circulation caused by insufficient oil return amount when the compressor is operated at a high frequency is eliminated, or the problem of oil shortage of the pump body caused by excessive oil return when the compressor is operated at a low frequency is eliminated, the stable lubrication of the compressor is realized, the performance and reliability of the compressor are improved to a certain extent, the matching between the compressor and the system is greatly improved, and the performance of the compressor is improved. When the oil return assembly of the present application is applied to a compressor, see Figure 1 and Figure 2As shown, the compressor comprises a crankshaft 1, a motor 2, a second support 3, a pump body 4, a first support 8, a moving scroll 9, a stationary scroll 10 and a shell 11, which are the same as the structure of the compressor in the prior art, the crankshaft 1, the motor 2, the second support 3, the pump body 4, the first support 8, the moving scroll 9 and the stationary scroll 10 are located in the shell 11, the pump body 4 pumps the lubricating oil in the oil pool to the lubricating parts, and after lubrication, the lubricating oil flows back to the first support 8, the first support 8 is provided with an oil return channel, the lubricating oil flows back to the oil pool through the oil return channel, so as to form an oil circulation.

[0038] In some embodiments, referring to Figure 6 As shown, the outlet end is provided with a first oil outlet piece 71, a through hole is formed in the first oil outlet piece 71, the through hole is in communication with the oil return pipe 7, the inner wall of the pipe sleeve 5 is provided with a protrusion, the protrusion is opposite to the through hole, and the oil conveying channel is located between the protrusion and the inner wall of the through hole. Specifically, referring to Figure 10 and Figure 11 As shown, the longitudinal section of the first oil outlet piece 71 and the protrusion is a trapezoid, the short side of the trapezoid faces the oil return pipe 7, and the long side and the oblique side of the trapezoid have an included angle a, which satisfies 55° < a < 85°.

[0039] In the technical scheme, through the cooperation of the through hole and the protrusion, when the compressor operates at a low frequency, the oil level in the oil pool is high, the pipe sleeve 5 is displaced under the action of the oil buoyancy, the protrusion and the inner wall of the through hole are close to each other, the cross-sectional area of the oil conveying channel is reduced, and the oil outlet amount of the oil outlet of the pipe sleeve 5 is also reduced; when the compressor operates at a high frequency, the oil level in the oil pool is low, the gravity of the pipe sleeve 5 is greater than the buoyancy received by the pipe sleeve 5, the pipe sleeve 5 moves under the action of gravity, the protrusion and the inner wall of the through hole are gradually away from each other, the cross-sectional area of the oil conveying channel is increased, and the oil outlet amount of the oil outlet of the pipe sleeve 5 is also increased. The longitudinal section of the first oil outlet piece 71 and the protrusion is a trapezoid, preferably an isosceles trapezoid, which utilizes the characteristics of the trapezoid to facilitate the adjustment of the cross-sectional area of the oil conveying channel; when the oil in the oil return pipe 7 flows to the oil conveying channel through the first oil outlet piece 71, the protrusion also plays a role in guiding the flow, guiding the lubricating oil to flow out of the oil outlet.

[0040] In some embodiments, referring to Figure 9As shown, the oil outlet is arranged on the outer peripheral wall of the sleeve 5, and the protrusion is arranged on the inner bottom surface of the sleeve 5. The maximum outer diameter of the first oil outlet part 71 is the same as the inner diameter of the sleeve 5, and the maximum outer diameter of the protrusion is not less than the maximum inner diameter of the through hole. In this technical solution, the oil outlet is arranged on the outer peripheral wall of the sleeve 5, and the protrusion is arranged on the inner bottom surface of the sleeve 5. When the lubricating oil in the oil conveying channel flows to the oil outlet through the protrusion, the lubricating oil flows into the oil pool along the outer peripheral wall of the sleeve 5, avoiding the disturbance of the oil return pipe 7 to the oil pool oil liquid surface, the maximum outer diameter of the first oil outlet part 71 is the same as the inner diameter of the sleeve 5, and when the sleeve 5 moves, the first oil outlet part 71 and the inner wall of the sleeve 5 can form a guiding effect, ensuring the sleeve 5 to move along the axial direction of the oil return pipe 7. Preferably, a guide surface can be arranged on the outer peripheral wall of the first oil outlet part 71 to prevent the sleeve 5 from moving unstably after the outer peripheral wall of the first oil outlet part 71 is worn, for example, the part of the outer peripheral wall of the first oil outlet part 71 close to the long side of the trapezoid is arranged as a plane, and the plane matches the inner peripheral wall of the sleeve 5. The maximum outer diameter of the protrusion is not less than the maximum inner diameter of the through hole, ensuring the cooperation between the protrusion and the through hole. Preferably, at least two oil outlets are arranged. The bottom of the first oil outlet part 71 is conical, and the included angle is 55°<a<85°. The sleeve 5 has a conical boss, and the included angle of the boss corresponds to the included angle of the first oil outlet part 71. The sleeve 5 has a through hole in the side wall, and the sleeve 5 can float on the oil liquid surface. The sleeve 5 is arranged on the oil return pipe and can move along the axial direction of the oil return pipe 7. The fixing plate 6 has a groove structure, and the fixing plate 6 is fixed on the sleeve 5 and can move along the axial direction of the oil return pipe 7. The oil pumping capacity of the pump body 4 is related to the operating frequency of the compressor. The oil pumping capacity increases with the increase of the frequency of the compressor, and then enters a gentle trend. When the compressor operates at a low frequency, the oil pumping capacity of the pump body 4 is small, the oil liquid level of the bottom oil pool is high, and the sleeve 5 floats on the oil liquid surface. At this time, the gap between the conical boss on the sleeve 5 and the conical groove on the first oil outlet part 71 is small, the oil return amount is reduced, and the lubricating oil entering the pump body is ensured. When the compressor operates at a high frequency, the oil pumping capacity of the pump body 4 increases, and the oil liquid level of the bottom oil pool begins to drop. At this time, the sleeve 5 moves downward along the axial direction of the oil return pipe 7, and the gap between the conical boss on the sleeve 5 and the conical groove on the first oil outlet part 71 gradually increases, the oil return amount increases, the lubricating oil entering the pump body is controlled, the oil circulation is controlled, and the performance of the compressor is improved.

[0041] In some embodiments, reference is made to Figure 7 and Figure 8As shown, the oil return assembly further comprises a fixing plate 6 sleeved on the oil return pipe 7, the fixing plate 6 is movable along the axial direction of the oil return pipe 7, the fixing plate 6 is connected with the pipe sleeve 5, and the inner diameter of the fixing plate 6 is smaller than the outer diameter of the outlet end. In this technical solution, the fixing plate 6 is sleeved on the oil return pipe 7, the fixing plate 6 is movable along the axial direction of the oil return pipe 7, the fixing plate 6 is connected with the pipe sleeve 5, and the inner diameter of the fixing plate 6 is smaller than the outer diameter of the outlet end, which prevents the pipe sleeve 5 from falling off the oil return pipe 7 and enables the oil return pipe sleeve to always move axially on the oil return pipe. Preferably, the fixing plate 6 is provided with a mounting groove, and the end of the pipe sleeve 5 is mounted in the mounting groove, which facilitates maintenance and disassembly.

[0042] In some embodiments, referring to Figures 12 to 16 As shown, the outlet end is provided with a second oil outlet piece 72, an oil conveying hole is formed in the outer peripheral wall of the second oil outlet piece 72, the oil conveying hole is in communication with the oil return pipe 7, a recess is formed in the pipe sleeve 5, the recess is opposite to the second oil outlet piece 72, and the oil conveying passage is located between the inner wall of the recess and the outer peripheral wall of the second oil outlet piece 72. Specifically, the longitudinal section of the second oil outlet piece 72 and the recess is a trapezoid, the long side of the trapezoid faces the oil return pipe 7, and the long side and the oblique side of the trapezoid have an included angle β, which satisfies 50°<β<80°. In this technical solution, when the compressor operates at a low frequency, the oil level in the oil pool is high, the pipe sleeve 5 is displaced under the action of the oil buoyancy, the outer peripheral wall of the second oil outlet piece 72 and the inner wall of the recess are close to each other, the cross-sectional area of the oil conveying passage is reduced, and the oil outlet amount of the oil outlet of the pipe sleeve 5 is also reduced. When the compressor operates at a high frequency, the oil level in the oil pool is low, the gravity of the pipe sleeve 5 is greater than the buoyancy received by the pipe sleeve 5, the pipe sleeve 5 moves under the action of gravity, the outer peripheral wall of the second oil outlet piece 72 and the inner wall of the recess are gradually away from each other, the cross-sectional area of the oil conveying passage is increased, and the oil outlet amount of the oil outlet of the pipe sleeve 5 is also increased.

[0043] The longitudinal section of the second oil outlet piece 72 and the recess is a trapezoid, preferably an isosceles trapezoid. The characteristics of the trapezoid are utilized to facilitate the adjustment of the cross-sectional area of the oil conveying passage. In the movement of the pipe sleeve 5, the side wall of the second oil outlet piece 72 and the side wall of the recess are matched, the adjustment of the cross-sectional area of the oil conveying passage is more convenient, the control gradient is accurate, the installation is simple, the structure is reliable, and the feasibility is strong. The bottom of the oil return pipe 7 has a boss, the second oil outlet piece 72, and the pipe sleeve 5 has a conical structure with an included angle of 50°<β<80°. The pipe sleeve 5 is provided with a through hole in the side wall and is rotatably arranged on the oil return pipe 7. The pipe sleeve 5 is provided with a recessed hollow structure, and the included angle β of the recessed hollow structure corresponds to the included angle of the second oil outlet piece 72.

[0044] When the compressor operates at low frequency, the pump body 4 pumps less oil, the oil level in the bottom oil pool is high, and the pipe sleeve 5 floats on the oil surface, at this time, the gap between the conical groove of the pipe sleeve 5 and the conical boss on the oil return pipe 7 is small, the oil return amount is reduced, and the lubricating oil entering the pump body is ensured. When the compressor operates at high frequency, the pump body 4 pumps more oil, and the oil level in the bottom oil pool begins to drop, at this time, the pipe sleeve 5 moves axially downward along the oil return pipe 7, the gap between the conical groove of the pipe sleeve 5 and the conical boss on the oil return pipe 7 gradually increases, the oil return amount increases, the lubricating oil entering the pump body 4 is controlled, the oil circulation is controlled, and the performance of the compressor is improved.

[0045] In some embodiments, the oil outlet is located at the groove bottom of the groove, the maximum outer diameter of the second oil outlet piece 72 is the same as the inner diameter of the pipe sleeve 5, and the maximum outer diameter of the second oil outlet piece 72 is greater than the maximum inner diameter of the groove. Specifically, the outlet end is provided with a fixing piece 73, the second oil outlet piece 72 is connected with the fixing piece 73, when the oil return assembly further includes a fixing plate 6, the outer diameter of the fixing piece 73 is greater than the inner diameter of the fixing plate 6. In this technical solution, the oil outlet is located at the groove bottom of the groove, when the lubricating oil flows out from the second oil outlet piece 72, the impact force of the lubricating oil is greatly reduced under the guidance of the inner wall of the groove, the lubricating oil slowly flows into the oil pool from the oil outlet, the disturbance caused by the oil return impact of the oil return pipe 7 on the oil surface of the bottom oil pool is avoided, the maximum outer diameter of the second oil outlet piece 72 is the same as the inner diameter of the pipe sleeve 5, and the maximum outer diameter of the second oil outlet piece 72 is greater than the maximum inner diameter of the groove. When the pipe sleeve 5 moves, the first oil outlet piece 71 and the inner wall of the pipe sleeve 5 can form a guiding effect, the axial movement of the pipe sleeve 5 along the oil return pipe 7 is ensured, the outer diameter of the fixing piece 73 is greater than the inner diameter of the fixing plate 6, the pipe sleeve 5 is prevented from falling off from the oil return pipe 7, the oil return pipe sleeve always moves axially on the oil return pipe, and the stability of the oil return assembly is improved.

[0046] The application also provides a compressor comprising the oil return assembly of any one of the preceding.

[0047] The above merely describes the preferred embodiments of the present application and should not be used to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application and should not be used to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil return assembly characterized by: The oil return assembly comprises: an oil return pipe (7) having an inlet end and an outlet end, the inlet end being configured to communicate with an oil return passage of the compressor, and a pipe sleeve (5) sleeved on the oil return pipe (7), the outlet end being located in the pipe sleeve (5), the pipe sleeve (5) having an oil outlet through which lubricating oil can be delivered to an oil pool of the compressor, and an oil delivery passage being formed between an inner wall of the pipe sleeve (5) and the outlet end, the pipe sleeve (5) being movable along an axial direction of the oil return pipe (7) to increase or decrease a cross-sectional area of the oil delivery passage according to a liquid level of the oil pool; the outlet end is provided with a first oil outlet member (71) having a through hole configured to communicate with the oil return pipe (7), and the inner wall of the pipe sleeve (5) is provided with a protrusion opposite to the through hole, and the oil delivery passage is located between the protrusion and the inner wall of the through hole.

2. The oil return assembly of claim 1, wherein: a longitudinal section of the first oil outlet member (71) and the protrusion is in a trapezoidal shape, a short side of the trapezoidal shape is directed towards the oil return pipe (7), and an included angle a between a long side and an oblique side of the trapezoidal shape satisfies 55° < a < 85°.

3. The oil return assembly of claim 1, wherein: the oil outlet is arranged on an outer peripheral wall of the pipe sleeve (5), the protrusion is arranged on an inner bottom surface of the pipe sleeve (5), a maximum outer diameter of the first oil outlet member (71) is the same as an inner diameter of the pipe sleeve (5), and a maximum outer diameter of the protrusion is not less than a maximum inner diameter of the through hole.

4. The oil return assembly of claim 1, wherein: the oil return assembly further comprises a fixing plate (6) sleeved on the oil return pipe (7), the fixing plate (6) being movable along the axial direction of the oil return pipe (7), the fixing plate (6) being connected with the pipe sleeve (5), and an inner diameter of the fixing plate (6) being less than an outer diameter of the outlet end.

5. The oil return assembly of claim 1, wherein: the outlet end is provided with a second oil outlet member (72) having an oil delivery hole configured to communicate with the oil return pipe (7), and the pipe sleeve (5) is provided with a groove opposite to the second oil outlet member (72), and the oil delivery passage is located between an inner wall of the groove and an outer peripheral wall of the second oil outlet member (72).

6. The oil return assembly of claim 5, wherein: a longitudinal section of the second oil outlet member (72) and the groove is in a trapezoidal shape, a long side of the trapezoidal shape is directed towards the oil return pipe (7), and an included angle β between the long side and the oblique side of the trapezoidal shape satisfies 50° < β < 80°.

7. The oil return assembly of claim 5, wherein: the oil outlet is located at a groove bottom of the groove, a maximum outer diameter of the second oil outlet member (72) is the same as the inner diameter of the pipe sleeve (5), and the maximum outer diameter of the second oil outlet member (72) is greater than a maximum inner diameter of the groove.

8. The oil return assembly of claim 5, wherein: the outlet end is provided with a fixing member (73), the second oil outlet member (72) is connected with the fixing member (73), and when the oil return assembly further comprises the fixing plate (6), an outer diameter of the fixing member (73) is greater than an inner diameter of the fixing plate (6).

9. A compressor characterized by: The oil return assembly comprises any one of claims 1-8.

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