Oil return device in compressor oil way based on siphon principle

Abstract

The invention relates to the technical field of compressors, in particular to an oil return device in a compressor oil way based on the siphon principle, the oil return device comprises a crankshaft, a motor cavity and a crankshaft cavity which are arranged in the compressor, an oil through hole is formed in the crankshaft, and a cleaning pipe extending into the crankshaft cavity is arranged on one side of the motor cavity in a penetrating mode; a high-pressure pipe extending into the crankshaft cavity is arranged on one side of the oil through hole in a penetrating mode, the same pressurizing pipe is arranged at the end of the cleaning pipe and the end of the high-pressure pipe, the cleaning pipe sucks lubricating oil out through the siphoning effect and returns the lubricating oil to the pressurizing pipe, and the pressurizing pipe is used for pressurizing and accelerating the lubricating oil. A spraying pipe opposite to the crankshaft is arranged at one end of the pressurizing pipe, and high-speed lubricating oil is sprayed out and returned through the spraying pipe. Through the arrangement of the oil return device, the liquid level difference of the high-pressure pipe and the cleaning pipe is facilitated to construct a siphon effect, lubricating oil accumulated in the motor cavity is circularly cleaned, and the siphon speed is improved and the oil return time is shortened in combination with the use of the pressurizing pipe.

Description

Technical Field

[0001] The invention relates to the technical field of compressor oil circuit equipment, and in particular to an oil return device in a compressor oil circuit based on a siphon principle. Background Art

[0002] A piston compressor relies on the reciprocating motion of a piston to pressurize and transport gas. This type of compressor is a positive displacement compressor, also known as a "reciprocating piston compressor" or "reciprocating compressor." It has an internal lubricating oil circulation system. When the lubricating oil circulation system is in operation, it transfers external lubricating oil to the crankshaft inside the compressor. Through oil holes in the crankshaft, the high-pressure lubricating oil is delivered to moving parts such as the piston, cylinder wall, bearings, and motor rotor, assisting with sealing and heat dissipation.

[0003] When the compressor is operating, the lubricating oil in the compressor primarily lubricates the compressor's moving parts. However, within the entire compressor system, the use of lubricating oil can affect the refrigerant's heating and heat exchange, making its presence undesirable. However, the presence of lubricating oil in the system is unavoidable, so some lubricating oil is mixed with the refrigerant vapor. Because the lubricating oil and refrigerant are miscible, when the refrigerant vapor is discharged, it collides with the compressor's internal cavity and evaporates, leaving the lubricating oil in the motor cavity and accumulating. Since the compressor crankshaft cavity and the motor cavity are not connected, the accumulation of lubricating oil can affect the motor's performance. For these reasons, it is necessary to design an oil return device in the compressor oil circuit based on the siphon principle to address this problem. Summary of the Invention

[0004] The object of the present invention is to provide an oil return device in a compressor oil circuit based on the siphon principle, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: An oil return device in a compressor oil circuit based on the siphon principle comprises a crankshaft, a motor cavity and a crankshaft cavity arranged inside the compressor, an oil through hole being opened in the crankshaft, a cleaning pipe extending into the crankshaft cavity being provided through one side of the motor cavity, a high-pressure pipe extending into the crankshaft cavity being provided through one side of the oil through hole, a same pressurizing pipe being provided at the ends of the cleaning pipe and the high-pressure pipe, the cleaning pipe utilizing a siphon effect to suck out lubricating oil and return it to the pressurizing pipe, and the pressurizing pipe is used to pressurize the lubricating oil and increase its speed; One end of the pressurizing pipe is provided with a spray pipe opposite to the crankshaft, and the spray pipe is used to spray high-speed lubricating oil and return it to the oil.

[0006] Preferably, the pressure pipe includes a first-level pressure seat connected to the high-pressure pipe, the outer sleeve of the first-level pressure seat is provided with a second-level pressure seat connected to the cleaning pipe, and one end of the second-level pressure seat is provided with a thin tube connected to the ejection pipe for recovering the pressurized ejection of the lubricating oil.

[0007] Preferably, a pressurizing chamber is provided inside the other end of the secondary pressurizing seat, and an inner tube penetrating the pressurizing chamber is provided at the end of the primary pressurizing seat. The cleaning tube is vertically distributed to the outlet end of the inner tube for siphoning the lubricating oil.

[0008] Preferably, a low-pressure check valve is provided at one end of the high-pressure pipe, and a high-pressure check valve is provided at one end of the cleaning pipe. The high-pressure pipe and the cleaning pipe are both inclined downward at one end of the crankshaft chamber for one-way reflux of lubricating oil to improve siphon stability.

[0009] Preferably, a breaking up tube is provided through the middle of the cleaning tube, and end covers are provided at both ends of the breaking up tube. A limiting disk is provided on the inner side of the end cover, and a buffer disk is provided on the outer side of the limiting disk. The same spiral blade is rotatably provided between the two buffer disks for centrifugal breaking up of the lubricating oil.

[0010] Preferably, a plurality of hemispheres are evenly arranged on one side of the buffer plate close to the limiting plate, and the limiting plate is provided with slots for limiting the plurality of hemispheres. The limiting plate is made of damping material and is used for buffering and limiting the buffer plate and the limiting plate.

[0011] Preferably, a buffer spring disk is provided on the side of the buffer disk away from the limit disk, a bearing is provided in the middle of the buffer spring disk, a rotating shaft passing through the middle of the spiral leaf is rotatably provided in the middle of the bearing, and the rotating shaft is coaxially arranged with the breaking up tube for mixing and breaking up the lubricating oil.

[0012] Preferably, the rotating shaft is configured as an electromagnet, and the outside of the bearing is connected to a power source for cleaning lubricating oil.

[0013] Preferably, the middle parts of the two end covers are sealed with a through pipe, the lower end of the through pipe is provided with a discharge pipe, the upper end of the discharge pipe is provided with a one-way valve, and the lower end of the discharge pipe is provided with a discharge end located on the compressor.

[0014] Preferably, the ejection pipe is in an L-shaped structure, the upper end of the ejection pipe is set as a rectangular pipe mouth, the height of the ejection pipe is higher than the height of the cleaning pipe and the pressurizing pipe, and is used for high-pressure ejection of lubricating oil.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention utilizes the existing factor that the pressure in the crankshaft cavity is higher than that in the motor cavity during operation, and provides an oil return device connected between the motor cavity and the crankshaft cavity. The oil through hole can be connected to the motor cavity. The high-pressure check valve is used to prevent the backflow of high-pressure lubricating oil, and the low-pressure check valve is used to prevent the backflow of low-pressure lubricating oil. The crankshaft oil through hole is connected to the high-pressure pipe through a high-pressure pipe. The high-pressure lubricating oil can flush the low-pressure check valve and drain to the pressurized pipe. The liquid level difference between the lubricating oil in the oil through hole and the motor cavity produces a siphon effect, which drives the high-pressure check valve to open, and transfers the lubricating oil accumulated in the motor cavity, thereby solving the problem of lubricating oil accumulation in the motor cavity and improving the working performance of the compressor oil circuit. 2. In the present invention, the pressure pipe is used in conjunction with the first-stage pressure seat and the second-stage pressure seat, and the high-pressure lubricating oil flowing through the oil hole can be used to form an ejection effect, thereby accelerating the suction of the lubricating oil in the motor cavity. The lubricating oil accumulated in the motor cavity is sucked into the pressure chamber, and then the lubricating oil flow rate is increased by setting a thin tube at the end of the second-stage pressure seat. The oil is sprayed to the outside of the crankshaft through the ejection pipe to supply oil to the external structure of the crankshaft, thereby realizing the circulation and return of the lubricating oil, saving the supply of lubricating oil, increasing the energy-saving performance of the oil return device, and improving the oil supply effect of the oil circuit; 3. In the present invention, by setting up a scattering tube on the cleaning tube, it is convenient for the oil return device to utilize the siphon effect to discharge the lubricating oil accumulated in the motor cavity, and the rotation of the spiral blade is used to perform centrifugal mixing and acceleration, thereby increasing the discharge rate of the lubricating oil and preventing the lubricating oil from being retained; by using the rotating shaft electromagnet structure, impurities in the lubricating oil can be magnetically attracted to clean the lubricating oil, and by opening the one-way valve, the viscous lubricating oil can be transferred outward, the oil return device can be cleaned and maintained, and the oil return smoothness and service life of the device can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the structure of the present invention located inside the compressor; Figure 2 A cross-sectional view of a local structure of the present invention located inside a compressor; Figure 3 Schematic diagram of the structure of the cleaning pipe, high-pressure pipe and ejection pipe in the present invention; Figure 4 Schematic diagram of the structure of the pressure tube in the present invention; Figure 5 It is an exploded view of the local structure of the broken pipe in the present invention; Figure 6 Schematic diagram of the structure of the limit plate, buffer plate and rotating shaft in the present invention; Figure 7 It is a cross-sectional view of the internal structure of the through pipe and the discharge pipe in the present invention.

[0017] In the figure: 1. Oil hole; 2. Motor cavity; 3. Crankshaft cavity; 4. Cleaning pipe; 5. Breaking pipe; 6. Pressurizing pipe; 7. Ejection pipe; 8. High-pressure pipe; 9. First-stage pressurizing seat; 10. Inner pipe; 11. Second-stage pressurizing seat; 12. Capillary tube; 13. End cover; 14. Limit plate; 15. Buffer plate; 16. Hemisphere; 17. Buffer spring plate; 18. Bearing; 19. Rotating shaft; 20. Spiral blade; 21. Through pipe; 22. Discharge pipe; 24. One-way valve; 25. Discharge end; 26. High-pressure check valve; 27. Low-pressure check valve. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] See also Figure 1-7 , the present invention provides a technical solution: An oil return device in the oil circuit of a compressor based on the siphon principle applies the lubricating oil supply system and oil supply working principle of an existing piston compressor, wherein a motor cavity 2 and a crankshaft cavity 3 are provided inside the compressor, a crankshaft is rotatably provided at the upper end of the crankshaft cavity 3, an oil through hole 1 is provided in the middle of the crankshaft, and lubricating oil is supplied to the oil through hole 1 in the crankshaft through the supply system, delivering high-pressure lubricating oil to the external structure of the crankshaft and the motor. In order to avoid the accumulation and retention of lubricating oil in the motor cavity 2, a cleaning pipe 4 can be provided through one side of the motor cavity 2, one end of the cleaning pipe 4 is located at the motor cavity 2 and passes through, and the other end extends into the crankshaft cavity 3; a high-pressure pipe 8 is provided through one side of the oil through hole 1, and one end of the high-pressure pipe 8 is extended into the crankshaft cavity 3. The connection angle between the high-pressure pipe 8 and the oil through hole 1 can be set to 30° (as shown in the attached figure). Figure 2 As shown), to reduce the local resistance when the lubricating oil flows in; then, the same pressurizing pipe 6 is set at the end of the cleaning pipe 4 and the high-pressure pipe 8, and the pressure difference is formed by the liquid level height difference between the oil hole 1 and the motor cavity 2 (the height difference between the two valves is not less than 50mm). The high-pressure lubricating oil at the oil hole 1 flows into the pressurizing pipe 6 through the high-pressure pipe 8, and the accumulated lubricating oil in the motor cavity 2 is sucked into the pressurizing pipe 6 by means of the siphon effect (the core of which is the fluid potential energy conversion driven by the height difference), thereby cleaning the accumulated lubricating oil; then, the transferred lubricating oil is merged with the high-pressure lubricating oil flowing into the pressurizing pipe 6, and is pressurized and accelerated by the pressurizing pipe 6 and then passed into the ejection pipe 7 set at the end of the pressurizing pipe 6. Through the relative distribution of the outlet end of the discharge pipe 7 and the crankshaft, the ejection pipe 7 can spray the high-speed lubricating oil to the outer surface of the crankshaft, thereby returning the accumulated lubricating oil in the motor cavity 2, refluxing the lubricating oil for recycling, avoiding the accumulation of lubricating oil inside the motor cavity 2, and reducing the impact of the lubricating oil on the motor.

[0020] When setting up the structure of the reflux device, Figure 2 、 3As shown in Figure 4, a low-pressure check valve 27 is provided at one end of the high-pressure pipe 8 near the oil hole 1 to prevent the low-pressure lubricating oil from flowing back to the oil hole 1; a high-pressure check valve 26 is provided at one end of the cleaning pipe 4 near the motor cavity 2 to prevent the high-pressure lubricating oil from flowing back to the motor cavity 2; then, the high-pressure pipe 8 and the cleaning pipe 4 are tilted downward at one end of the crankshaft cavity 3 so that the outlet ends of the two pipes are lower than the inlet ends; and the height of the low-pressure check valve 27 is higher than the height of the high-pressure check valve 26, and there is a liquid level difference between the two valves, which is not less than 50mm to ensure the minimum liquid level difference required for siphon start-up. When the compressor is working, the lubricating oil inside the reflux device is affected by the atmospheric pressure and gravity to realize the flow of the lubricating oil in the motor cavity 2 to the pressurized pipe 6, realize the siphon reflux application of the reflux device, realize the one-way reflux of the lubricating oil, and improve the siphon stability.

[0021] Next, in order to increase the pressure difference between the high-pressure lubricating oil introduced into the pressurized pipe 6 and the motor cavity 2, the smoothness of the oil return of the accumulated lubricating oil is increased. In some embodiments, the pressurized pipe 6 can use a first-level pressurized seat 9 that is connected to the high-pressure pipe 8, and use the high-pressure lubricating oil flow in the oil hole 1 to form an ejection effect to accelerate the suction of the lubricating oil in the motor cavity 2; then, a second-level pressurized seat 11 is sleeved on the outside of the first-level pressurized seat 9, and the second-level pressurized seat 11 is connected to the cleaning pipe 4 and the ejection pipe 7. A thin tube 12 with a contraction section is provided at one end of the second-level pressurized seat 11 close to the first-level pressurized seat 9, and the thin tube 12 is coaxially connected to the outlet of the first-level pressurized seat 9 to form a Venturi effect. At the same time, the Bernoulli effect is used to convert static pressure energy into kinetic energy to form a high-speed jet, which can be applied to the pressurized lubricating oil flow rate of high-pressure lubricating oil, increase the siphon strength of the reflux device, and provide favorable conditions for the transfer of the accumulated lubricating oil in the motor cavity 2; as the converging end for siphoning out the accumulated lubricating oil and the high-pressure lubricating oil, the lubricating oil is discharged uniformly. Finally, a capillary tube 12 can be installed through the end of the secondary pressurizing seat 11 near the discharge pipe 7. Utilizing the principle that small holes increase output pressure, when the oil return device is installed, the inner diameter of capillary tube 12 is 1 / 3 to 1 / 2 of that of inner tube 10. Based on the continuity equation, the flow rate can be increased by more than three times. This increases the flow rate of the output lubricating oil, achieves pressurized discharge of the recovered lubricating oil, expands the spray area and evenness of the lubricating oil, and improves the reflux utilization efficiency of the reflux device.

[0022] An inner tube 10, extending through the pressurized chamber, is installed at the end of the first-stage pressurizing seat 9. The other end of the second-stage pressurizing seat 11 can be configured as a pressurized chamber. The inner tube 10 is positioned within the pressurized chamber, and the cleaning tube 4 is perpendicularly arranged to the outlet end of the inner tube 10, facilitating the collection and output of high-pressure lubricating oil and accumulated lubricating oil. In terms of the tube inner diameter, the output diameter of the capillary tube 12 is successively smaller than that of the inner tube 10, the high-pressure tube 8, and the cleaning tube 4. This increases the flow rate of the output lubricating oil and significantly enhances the dynamic pressure (kinetic energy of the fluid). This is used for the reflux device to siphon the lubricating oil. Compared with traditional gravity oil return, this can increase the siphon rate and shorten the oil return time.

[0023] Furthermore, since the accumulated lubricating oil has poor fluidity, in order to efficiently return the accumulated lubricating oil for use, such as Figure 4 and 5 As shown, in some embodiments, a scattering tube 5 can be provided through the middle of the cleaning tube 4, and end caps 13 are provided at both ends of the scattering tube 5. A limit plate 14 is fixedly provided on the inner side of the end cap 13, and a buffer plate 15 is provided on the outer side of the limit plate 14. A same spiral blade 20 is rotatably provided between the two buffer plates 15, and the two ends of the spiral blade 20 elastically abut against the end caps on both sides. The spiral blade 20 is made of polytetrafluoroethylene and is resistant to lubricating oil corrosion. When flowing liquid is passed into the scattering tube, the kinetic energy of the liquid can drive the spiral blade 20 to rotate. The speed of the spiral blade 20 can reach 300-500rpm, reducing the viscosity of the lubricating oil by more than 20%, stirring the lubricating oil, and breaking up the thick lubricating oil for easy removal. At the same time, the centrifugal force of the rotation of the spiral blade 20 is used to increase the flow rate of the lubricating oil at this location, so that the lubricating oil in the motor cavity flows more conveniently to the scattering tube, thereby improving the reflux rate and cleanliness of the lubricating oil inside the motor cavity 2.

[0024] Furthermore, if Figure 6 As shown, in some embodiments, a plurality of evenly distributed hemispheres 16 may be provided on one side of the buffer plate 15 near the limiting plate 14. Furthermore, the limiting plate 14 may include notches for the hemispheres 16 to retain their positions. The limiting plate 14 may be constructed of damping material. When the buffer plate is subjected to compression, the limiting plate 14 mitigates the external force, thereby limiting the position of the buffer plate 15 and improving the operational stability of the spiral blade 20.

[0025] A conical buffer spring disk 17 can be used on the side of the buffer disk 15 away from the limit disk 14, and its wide-mouth end is arranged close to the end cover. When the specifications of the buffer spring disk 17 are selected, its deformation pressure is greater than the rotational centrifugal force of the spiral blade 20, ensuring that the buffer disk 15 stably supports the spiral blade 20; then a bearing 18 is set in the middle of the buffer spring disk 17, and a rotating shaft 19 is set in the middle of the bearing 18 to pass through the middle of the spiral blade 20. The rotating shaft 19 is coaxially arranged with the breaking up tube 5. By using the bearings 18 at both ends, the angle of the spiral blade 20 is conveniently rotated to break up the mixture of the lubricating oil.

[0026] Next, the metal impurities in the returned lubricating oil can also be cleaned. The rotating shaft 19 adopts a hollow tubular iron core with an excitation coil wound on the outside. A DC power supply is introduced through the bearing 18 to form an electromagnet. The bearing 18 is made of conductive material. The power is transmitted to the bearing 18 through an external power supply, which makes it convenient for the middle rotating shaft 19 to be energized and magnetic, and the magnetic metal in the lubricating oil is adsorbed and cleaned, thereby increasing the cleanliness of the lubricating oil and improving the return oil quality.

[0027] Secondly, if Figure 7As shown, in some embodiments, the middle parts of the two end covers 13 can be set as a through pipe 21 for airtight connection, and a discharge pipe 22 for facilitating the discharge of lubricating oil is set through the lower end of the through pipe 21. Then, a one-way valve 24 is set at the upper end of the discharge pipe 22, and a detachable discharge end 25 is set at the lower end of the discharge pipe 22 on the compressor. When the compressor is used for a long time or repaired, the one-way valve 24 can be opened to transfer the lubricating oil accumulated in the motor cavity 2, and the lubricating oil in the reflux device can also be discharged, thereby increasing the return oil life and ensuring the quality of the reflux lubricating oil.

[0028] Finally, if Figure 2 and 3 As shown, the ejection pipe 7 is configured as an upwardly opening L-shaped structure, with a rectangular orifice at its upper end. The height of the ejection pipe 7 is set higher than that of the cleaning pipe 4 and the pressurizing pipe 6. In this configuration, the rectangular orifice of the ejection pipe 7 is 5 to 8 mm wide and maintains a distance of 10 to 15 mm from the crankshaft surface. High-velocity lubricating oil flows into the ejection pipe 7 and is discharged from the rectangular orifice, spraying onto the outer surface of the crankshaft, achieving high-pressure ejection of the lubricating oil and completing the reflux process.

[0029] Working principle of the present invention: Step 1: Use the siphon effect to transfer the lubricating oil in the motor cavity 2 back to the original state.

[0030] The oil return device leverages the existing lubricating oil supply system of the piston compressor. It utilizes the height difference between the oil level in the oil hole 1 and the motor cavity 2 (a height difference of at least 50 mm is established by the low-pressure check valve 27 and the high-pressure check valve 26) to create a siphoning condition. High-pressure lubricating oil from the oil supply system is continuously received through the crankshaft oil hole 1, providing lubrication for the crankshaft and motor. While this high-pressure lubricating oil is simultaneously passed through the high-pressure pipe 8 and into the pressurized pipe 6. Because lubricating oil easily accumulates in the motor cavity 2, a relatively low-pressure environment is created. Leveraging the pressure differential created by this height difference, combined with the ejection effect of the primary and secondary pressurized seats 9 and 11 in the high-pressure pipe 8, the cleaning pipe 4 draws accumulated lubricating oil from the motor cavity 2 into the pressurized pipe 6, achieving siphoning and cleaning. The recovered oil then mixes with the high-pressure oil in the pressurized pipe 6 before being sprayed at high speed onto the crankshaft surface through the capillary pipe 12 and the spray pipe 7, where it re-enters the lubrication cycle, enabling the recycling of the recovered oil and preventing accumulation in the motor cavity 2.

[0031] Step 2: Amplify the flow rate to improve the siphon effect.

[0032] During the oil return process of the oil return device, the pressurizing pipe 6 is connected with the high-pressure pipe 8 through the first-level pressurizing seat 9, and the suction is accelerated by the injection effect of the high-pressure oil flow; then, a contraction section is set through the externally sleeved second-level pressurizing seat 11, which is coaxial with the outlet of the first-level pressurizing seat 9 to form a Venturi effect, combined with the mixing of the accumulated lubricating oil sucked in the cleaning pipe 4, to form a high-speed jet, further expanding the pressure difference and enhancing the siphoning ability of the lubricating oil in the motor cavity 2.

[0033] Step 3: Increase the suction force of port 4 of the cleaning pipe to improve the cleanliness of the lubricating oil return.

[0034] By using a break-up tube 5 on the cleaning tube 4, the impact of lubricating oil on the spiral blades 20 is utilized to rotate the spiral blades 20 on the rotating shaft 19, thereby breaking up and transporting the accumulated lubricating oil, thus preventing lubricating oil from stagnating. Furthermore, the centrifugal force of the spiral blades 20 accelerates the oil flow, resolving the problem of poor fluidity of accumulated oil and improving the efficiency of delivery to the pressurized tube 6. The static pressure energy of the lubricating oil is converted into kinetic energy, delivering a high-speed jet of fluid to the pressurized tube 6.

[0035] Step 4: One-way flow control to increase the stability of the oil return device.

[0036] When the compressor is powered off and shut down, a low-pressure check valve 27 and a high-pressure check valve 26 are respectively provided through the high-pressure pipe 8 and the cleaning pipe 4 to prevent the lubricating oil in the pipe from flowing back. By tilting the two pipes downward at the ends of the crankshaft chamber 3 (the outlet end is lower than the inlet end), combined with the atmospheric pressure and gravity, the lubricating oil is ensured to flow into the pressurized pipe 6 in one direction, thereby improving the siphon stability.

[0037] Step 5: Clean the inside of the reflux device to absorb and purify the metal impurities in the lubricating oil The hollow tubular core of the rotating shaft 19 absorbs and removes magnetic metal impurities from the incoming lubricating oil, improving the cleanliness of the return oil. During extended use, the discharge port 25 and one-way valve 24 can be used to divert the lubricating oil from the return device and periodically clean it, ensuring a clean and tidy return oil system.

[0038] The basic principles, main features, and advantages of the present invention are shown and described above. The present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil return device in a compressor oil circuit based on the siphon principle, comprising a crankshaft, a motor cavity (2) and a crankshaft cavity (3) arranged inside the compressor, an oil hole (1) being opened in the crankshaft, and characterized in that: A cleaning pipe (4) extending into the crankshaft chamber (3) is provided through one side of the motor chamber (2), a high-pressure pipe (8) extending into the crankshaft chamber (3) is provided through one side of the oil hole (1), and the ends of the cleaning pipe (4) and the high-pressure pipe (8) are provided with the same pressurizing pipe (6); The cleaning pipe (4) uses a siphon effect to suck the lubricating oil out and return it to the pressure pipe (6), and the pressure pipe (6) is used to pressurize and speed up the lubricating oil; One end of the pressurizing pipe (6) is provided with a spray pipe (7) opposite to the crankshaft, and the spray pipe (7) is used to spray out the high-speed lubricating oil for oil return.

2. The oil return device in the compressor oil circuit based on the siphon principle according to claim 1, characterized in that: The pressurizing pipe (6) includes a first-level pressurizing seat (9) which is connected to the high-pressure pipe (8); the outer sleeve of the first-level pressurizing seat (9) is provided with a second-level pressurizing seat (11) which is connected to the cleaning pipe (4); one end of the second-level pressurizing seat (11) is provided with a thin tube (12) which is connected to the ejection pipe (7) for recovering the pressurized ejection of lubricating oil.

3. The oil return device in the compressor oil circuit based on the siphon principle according to claim 2, characterized in that: A pressurizing chamber is provided inside the other end of the secondary pressurizing seat (11), and an inner tube (10) penetrating the pressurizing chamber is provided at the end of the primary pressurizing seat (9). The cleaning tube (4) is vertically distributed with the outlet end of the inner tube (10) for siphoning lubricating oil.

4. The oil return device in the compressor oil circuit based on the siphon principle according to claim 1, characterized in that: A low-pressure check valve (27) is provided at one end of the high-pressure pipe (8), and a high-pressure check valve (26) is provided at one end of the cleaning pipe (4). The ends of the high-pressure pipe (8) and the cleaning pipe (4) located in the crankshaft chamber (3) are both tilted downward for one-way reflux of lubricating oil, thereby improving siphon stability.

5. The oil return device in the compressor oil circuit based on the siphon principle according to claim 1, characterized in that: A scattering pipe (5) is provided through the middle of the cleaning pipe (4), and end covers (13) are provided at both ends of the scattering pipe (5). A limiting plate (14) is provided on the inner side of the end cover (13), and a buffer plate (15) is provided on the outer side of the limiting plate (14). A same spiral blade (20) is rotatably provided between the two buffer plates (15) for centrifugal scattering of the lubricating oil.

6. The oil return device in the compressor oil circuit based on the siphon principle according to claim 5, characterized in that: A plurality of hemispheres (16) are evenly arranged on one side of the buffer plate (15) close to the limiting plate (14), and slots for limiting the plurality of hemispheres (16) are provided on the limiting plate (14). The limiting plate (14) is made of a damping material and is used for buffering and limiting the buffer plate (15) and the limiting plate (14).

7. The oil return device in the compressor oil circuit based on the siphon principle according to claim 6, characterized in that: A buffer spring disk (17) is provided on the side of the buffer disk (15) away from the limiting disk (14), a bearing (18) is provided in the middle of the buffer spring disk (17), a rotating shaft (19) penetrating the middle of the spiral blade (20) is rotatably provided in the middle of the bearing (18), and the rotating shaft (19) is coaxially arranged with the breaking pipe (5) for mixing and breaking up the lubricating oil.

8. The oil return device in the compressor oil circuit based on the siphon principle according to claim 7, characterized in that: The rotating shaft (19) is configured as an electromagnet, and the bearing (18) is externally connected to a power source for cleaning lubricating oil.

9. The oil return device in the compressor oil circuit based on the siphon principle according to claim 8, characterized in that: The middle parts of the two end covers (13) are sealedly connected with a through pipe (21), the lower end of the through pipe (21) is provided with a discharge pipe (22), the upper end of the discharge pipe (22) is provided with a one-way valve (24), and the lower end of the discharge pipe (22) is provided with a discharge port (25) located on the compressor.

10. The oil return device in the compressor oil circuit based on the siphon principle according to claim 1, characterized in that: The ejection pipe (7) is in an L-shaped structure, the upper end of the ejection pipe (7) is arranged as a rectangular pipe mouth, the height of the ejection pipe (7) is higher than the heights of the cleaning pipe (4) and the pressurizing pipe (6), and is used for high-pressure ejection of lubricating oil.

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