Oil return pipe mechanism and compressor

Abstract

The application provides an oil return pipe mechanism and a compressor, comprising an oil return pipe, a support, a spring, an active valve plate and a fixed valve plate, the oil return pipe being connected with an upper support oil pool, a lower support oil pool and a bottom oil pool. The active valve plate is slidable and initially adheres to the fixed valve plate under the spring elastic force; when the oil pool pressure rises to a set value, the oil pushes the active valve plate to overcome the spring resistance, opens the corresponding oil return channel and leads the excess oil back to the bottom oil pool. The upper support oil return pipe is preferentially opened to maintain the back pressure tank pressure, and the lower support oil return pipe is opened to further release pressure when the rotating speed is increased, so that the adaptive oil pressure regulation under different working conditions is realized, the orbiting scroll back pressure is stabilized, the friction loss is reduced and the operation reliability is improved. The application has reasonable structure layout, low machining precision requirement and high oil return efficiency and is suitable for scroll compressors with various rotating speeds and frequencies.

Description

Technical Field

[0001] This invention relates to the field of refrigeration and air conditioning technology, and in particular to a multi-stage adaptive oil return pipe mechanism for a scroll compressor and a scroll compressor including the mechanism, which is used to adaptively adjust the oil circuit pressure under different speed and frequency conditions, stabilize the back pressure of the moving plate, and improve the reliability and energy efficiency of the compressor operation. Background Technology

[0002] With the steady improvement of my country's productivity, household and commercial air conditioners are widely used. Under the background of energy conservation and emission reduction, the performance requirements for compressors in air conditioning systems are also becoming more stringent. Currently, during compressor operation, there is an issue of unstable back pressure forming on the moving plate under different operating conditions.

[0003] Generally, as the operating frequency of the compressor increases, the crankshaft speed of the compressor will rise, leading to an increase in the oil supply volume of the oil supply components (oil pump, oil guide vanes). Therefore, when the back pressure of the moving plate meets the requirements under a certain operating condition, the oil pressure will be too low under slightly lower operating conditions, resulting in an excessively large gap between the moving and stationary plates and poor sealing performance; conversely, under slightly higher operating conditions, the oil pressure will be too high, resulting in an excessively small gap between the moving and stationary plates, leading to problems such as frictional loss and poor operational reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage adaptive oil return pipe mechanism for a scroll compressor and a scroll compressor including the mechanism, so that the oil circuit pressure is adaptively adjusted with the speed, ensuring stable back pressure of the moving plate, sufficient lubrication, and low friction loss under various operating conditions, thereby solving the technical problems of unstable back pressure of the moving plate, inaccurate oil return control, and insufficient oil return capacity at high speed in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a return oil pipe mechanism, comprising: Return oil pipe, elastic element, activating valve plate, fixed valve plate, upper support oil tank, lower support oil tank and bottom oil tank; The three ports of the return oil pipe are respectively connected to the upper support oil tank, the lower support oil tank and the bottom oil tank; The fixed valve plate is fixed at the first and second inlets of the return oil pipe, and the activated valve plate is located on the inner side of the return oil pipe inlet via the elastic element, and can slide along the pipe wall; In the initial state, the activated valve plate is pressed against the fixed valve plate by the elastic force of the elastic element to close the oil return channel; When the oil tank pressure rises to the set value, the oil pushes the activation valve plate to overcome the resistance of the elastic element and generate displacement, so as to open the corresponding oil return channel and allow the oil to flow back to the bottom oil tank.

[0006] The oil return pipe mechanism of this invention, through a preset elastic force threshold of the elastic element, enables the activated valve plate to open the oil return passage in stages under different oil pressure conditions, achieving multi-level adaptive adjustment. Under low-frequency conditions, the oil pressure is low, and the activated valve plate remains closed with the fixed valve plate, ensuring stable back pressure on the moving plate and avoiding insufficient lubrication. Under medium-frequency conditions, the oil pressure gradually increases and reaches the first-level threshold, at which point the activated valve plate overcomes some resistance from the elastic element to open the primary oil return channel, achieving appropriate pressure relief and maintaining dynamic back pressure balance. When entering high-frequency conditions, the oil pressure continues to rise to the second-level threshold, causing the activated valve plate to further displace, opening wider and more flow paths, significantly improving the oil return capacity and effectively avoiding excessive contact and frictional wear between the moving and stationary plates caused by excessively high oil pressure.

[0007] As a further improvement of the present invention, both the activating valve plate and the fixing valve plate are circular thin plates with through holes. When they are fitted together, the solid part and the through hole part cover each other, and the outer diameter of the valve plate matches the inner diameter of the return oil pipe.

[0008] When the activating valve plate and the fixed valve plate of the present invention are attached, the channel is closed by the misalignment and shielding of the through hole. When separated, an annular gap or connecting channel is formed to gradually release the oil pressure. Its outer diameter is precisely matched with the inner wall of the return oil pipe to ensure smooth sliding without deviation, thereby improving response sensitivity and sealing reliability.

[0009] As a further improvement of the present invention, the number of through holes on the activation valve plate is several, arranged around the outer ring of the activation valve plate; the number of through holes on the fixing valve plate is one, arranged at the center of the fixing valve plate.

[0010] The through holes on the activated valve plate of this invention are evenly distributed along the outer ring, forming a staggered shielding structure with the through hole of the single fixed valve plate set in the center. In the initial state, the two valve plates are in contact, and the through holes are completely closed, ensuring that the oil return channel is tightly closed. When the oil pressure rises to the first threshold, the activated valve plate moves slightly under the action of hydraulic pressure, overcoming the resistance of the elastic element. The outer ring through holes are misaligned with the solid part of the fixed valve plate, forming an annular throttling gap, realizing primary oil return. As the oil pressure continues to rise, the activated valve plate moves further, and the distance between the outer ring through holes and the center through hole of the fixed valve plate increases, realizing the opening of a larger flow area, entering the second stage of oil return. When the oil pressure reaches the highest threshold, the activated valve plate moves to the limit position, and its outer ring through holes are completely misaligned with the center through hole of the fixed valve plate, forming the maximum flow path, realizing efficient and rapid oil return, thereby fully adapting to the back pressure regulation requirements under different operating conditions of the compressor, and improving the system energy efficiency and operational stability.

[0011] As a further improvement of the present invention, the elastic element is a compression spring, and it also includes a support column, which is fixed to the inner wall of the F-type return oil pipe; one end of the compression spring is fixed to the support column, and the other end is connected to the activation valve plate.

[0012] This invention establishes a stable elastic reset structure by setting a support column on the inner wall of the F-type return oil pipe and fixing one end of a compression spring to the support column and connecting the other end to an activation valve plate. When the oil pressure decreases, the compression spring pushes the activation valve plate back, causing the two valve plates to re-fit and close the return oil passage. This structure ensures reliable valve plate operation and rapid response, effectively avoiding accidental opening caused by vibration or oil flow pulsation. It also facilitates assembly and positioning, improving the compactness and durability of the overall structure.

[0013] As a further improvement of the present invention, the upper support oil sump is connected to the back pressure oil groove through a PTFE sealing ring, providing pressure to the back of the moving plate and forming a sealed fit with the stationary plate.

[0014] This invention connects the upper support oil sump and the back pressure oil groove through a PTFE sealing ring, and dynamically adjusts the back pressure of the moving plate using the return oil pressure to achieve adaptive fitting of the main sealing line. The PTFE material has excellent oil resistance and low friction characteristics, ensuring stable sealing performance and minimal wear. During compressor start-up, shutdown, and variable load operation, the back pressure is automatically adjusted according to the oil circuit opening and closing, effectively avoiding high-pressure leakage and low-pressure desorption, significantly improving the seal life and system dust holding capacity, while reducing frictional power consumption and contributing to the optimization of overall machine energy efficiency.

[0015] As a further improvement of the present invention, the elastic force of the elastic element located at the lower support oil sump is greater than that of the elastic element located at the upper support oil sump. By differentiating the elastic forces of the elastic elements at the upper and lower support oil sump, the valve plate opening pressure threshold on the lower support side is higher than that on the upper support side, achieving graded response control. When the compressor is running at low load, the oil return channel on the upper support side opens first to maintain the basic back pressure. When the system load increases and the oil pressure rises to a higher level, the valve plate on the lower support side overcomes the greater elastic force to open and participate in the oil return regulation. This gradient design effectively avoids pressure fluctuations caused by simultaneous action on both sides, improves the back pressure regulation accuracy and dynamic response stability, and further optimizes the compressor's energy efficiency performance over a wide operating range.

[0016] The present invention provides a compressor, including the oil return pipe mechanism. The compressor of this invention employs the aforementioned oil return pipe mechanism, which effectively balances the axial force on the moving disc and suppresses vibration and impact under high-speed operation. During variable operating conditions, the back pressure is precisely adjusted through a multi-stage valve-controlled oil return mechanism to ensure that the main sealing line is always in optimal contact. At the same time, the PTFE sealing ring and the misaligned valve plate structure work together to improve the system response speed and sealing reliability. The entire machine operates more smoothly and efficiently, significantly reducing noise and energy consumption, extending service life, and meeting the stringent requirements of high-performance compressors for stability and energy efficiency.

[0017] As a further improvement of the present invention, it also includes a crankshaft oil passage, an oil pump and a bottom oil sump, wherein the oil pump supplies oil to the upper support oil sump and the lower support oil sump through the crankshaft oil passage, and the oil return pipe mechanism leads excess oil back to the bottom oil sump.

[0018] The compressor of this invention achieves stable oil supply to the upper and lower support oil sump through the coordinated operation of the crankshaft oil circuit and oil pump, ensuring the lubrication and cooling of key friction pairs. The oil return pipe mechanism efficiently returns excess oil to the bottom oil sump, avoiding oil accumulation and churning losses, further improving the circulation efficiency of the lubrication system. Under all operating conditions, the oil circuit is rationally distributed, and the thermal management performance is excellent, effectively reducing mechanical wear and energy consumption, enhancing the compressor's adaptability to high temperature and high load environments, and ensuring long-term operational reliability and energy efficiency stability.

[0019] As a further improvement of the present invention, the compressor is a scroll compressor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the installation of the compressor of the present invention; Figure 2 This is an exploded view of the parts of the oil return mechanism of the present invention; Figure 3 This is a diagram showing the closed state of an embodiment of the oil return mechanism of the present invention; Figure 4 This is an open state diagram of an embodiment of the oil return mechanism of the present invention; Figure 5 This is a partial assembly diagram (a) of an embodiment of the compressor of the present invention (upper bracket oil return pipe mechanism in closed state); Figure 6 This is a partial assembly diagram (II) of one embodiment of the compressor of the present invention (upper bracket oil return pipe mechanism in open state); Figure 7 This is a partial assembly diagram (three) of an embodiment of the compressor of the present invention (lower bracket oil return pipe mechanism in closed state); Figure 8 This is a partial assembly diagram (four) of an embodiment of the compressor of the present invention (lower support oil return pipe mechanism in open state).

[0022] In the picture: 1. Static plate; 2. Moving plate; 3. Back pressure oil tank; 4. Upper support oil bath; 5. Oil return pipe mechanism; 6. Crankshaft oil passage; 7. Lower support oil bath; 8. Oil pump driven; 9. Oil pump; 10. Bottom oil tank; A1. Return oil pipe; A2, Spring; A3. Activate the valve plate; A4. Fixed valve plate; B1, PTFE sealing ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] Example 1: like Figures 1-8 As shown, this invention provides a return oil pipe mechanism 5, which optimizes the problem of inconsistent back pressure of the scroll compressor's moving plate 2; it can adaptively adjust the return oil pipe A1 channel corresponding to different operating conditions, making the oil circuit pressure more reasonable for different operating conditions; specifically, the return oil pipe mechanism 5 includes: Oil return pipe A1, elastic element, activating valve plate A3, fixed valve plate A4, upper support oil tank 4, lower support oil tank 7 and bottom oil tank 10; The three ports of the return oil pipe A1 are respectively connected to the upper support oil tank 4, the lower support oil tank 7 and the bottom oil tank 10; Fixed valve plate A4 is fixed at the first and second openings of return oil pipe A1, and activated valve plate A3 is located on the inner side of the opening of return oil pipe A1 through an elastic element, and can slide along the pipe wall; In the initial state, the activated valve plate A3 is pressed against the fixed valve plate A4 by the elastic force of the elastic element to close the oil return passage; When the oil tank pressure rises to the set value, the oil pushes the activation valve plate A3 to overcome the resistance of the elastic element and generate displacement, thereby opening the corresponding oil return channel and allowing the oil to flow back to the bottom oil tank 10. The upper support oil return branch opens first when the oil tank pressure reaches the first set value, and the lower support oil return branch opens when the oil tank pressure reaches the second set value.

[0025] The first setting value corresponds to the minimum pressure required to maintain the back pressure oil tank 3, and the second setting value corresponds to the upper limit of pressure to prevent excessive oil pressure under high speed conditions.

[0026] like Figure 2 As shown, specifically in this embodiment, the return oil pipe A1 is F-shaped and includes an upper support return oil branch, a lower support return oil branch, and a main return oil circuit. The upper support return oil branch connects to the upper support oil sump 4 and is connected to the top of the main return oil circuit. The lower support return oil branch connects to the lower support oil sump 7 and is connected to the middle of the main return oil circuit. The bottom outlet of the main return oil circuit leads to the bottom oil sump 10. This invention integrates the return oil pipe A1 and the double valve spring A2 control structure to realize automatic opening and closing based on the oil sump pressure, directly determining that sufficient lubrication is achieved before oil is discharged, thus avoiding the uncertainty of indirect determination.

[0027] The oil return pipe mechanism 5 of the present invention is arranged at the upper support oil sump 4 and the lower support oil sump 7; by using the preset elastic force threshold of the elastic element, the activation valve plate A3 is opened in stages under different oil pressure conditions to achieve multi-level adaptive adjustment. Figure 5 and Figure 7 As shown, under low-frequency operating conditions, the oil pressure is low, and the activating valve plate A3 and the fixed valve plate A4 remain closed to ensure stable back pressure on the moving plate 2 and avoid insufficient lubrication; Figure 6 As shown, under medium-frequency operating conditions, the oil pressure gradually increases and reaches the first-stage threshold, activating valve plate A3 to overcome the partial resistance of the elastic element and open the primary return oil channel, achieving appropriate pressure relief and maintaining dynamic back pressure balance; as Figure 8 As shown, when entering high-frequency operating conditions, the oil pressure continues to rise to the second threshold, activating valve plate A3 to further displace, opening wider and more flow paths, greatly improving the oil return capacity, and effectively avoiding excessive contact and frictional wear of the moving and stationary plates 1 caused by excessive oil pressure.

[0028] like Figure 3 As shown, in an optional embodiment of the present invention, both the activating valve plate A3 and the fixing valve plate A4 are circular thin plates with through holes. When they are fitted together, the solid part and the through hole part shield each other. The outer diameter of the valve plate matches the inner diameter of the return oil pipe A1. The complementary shielding design of the valve plate through holes ensures reliable sealing when closed and unobstructed oil passage when opened, thereby improving control accuracy.

[0029] When the activating valve plate A3 and the fixed valve plate A4 of the present invention are attached, the channel is closed by the misalignment and shielding of the through hole. When separated, an annular gap or connecting channel is formed to gradually release the oil pressure. Its outer diameter is precisely matched with the inner wall of the return oil pipe A1 to ensure smooth sliding without deviation, thereby improving response sensitivity and sealing reliability.

[0030] like Figure 4As shown, as a further improvement of the present invention, the number of through holes on the activating valve plate A3 is several, arranged around the outer ring of the activating valve plate A3; the number of through holes on the fixing valve plate A4 is one, arranged at the center of the fixing valve plate A4.

[0031] The through holes on the activating valve plate A3 of this invention are evenly distributed along the outer ring, forming a staggered shielding structure with the through hole of the single fixed valve plate A4 located in the center. In the initial state, the two valve plates are in contact, and the through holes are completely closed, ensuring that the oil return channel is tightly closed. When the oil pressure rises to the first-stage threshold, the activating valve plate A3 moves slightly under the action of hydraulic pressure, overcoming the resistance of the elastic element. The outer ring through holes are misaligned with the solid part of the fixed valve plate A4, forming an annular throttling gap, realizing primary oil return. As the oil pressure continues to rise, the activating valve plate A3 moves further, and the distance between the outer ring through holes and the center through hole of the fixed valve plate A4 increases, realizing the opening of a larger flow area and entering the second-stage oil return stage. When the oil pressure reaches the highest threshold, the activating valve plate A3 moves to the limit position, and its outer ring through holes are completely misaligned with the center through hole of the fixed valve plate A4, forming the maximum flow path, realizing efficient and rapid oil return, thereby fully adapting to the back pressure regulation requirements under different operating conditions of the compressor and improving the system's energy efficiency and operational stability.

[0032] As a further improvement of the present invention, the elastic element is a compression spring A2, which provides a stable restoring force to ensure that the activated valve plate A3 quickly resets and closes the channel when the pressure drops. It also includes a support column welded to the inner wall of the return oil pipe A1 to ensure stable installation and uniform force distribution of the spring A2. The support column is welded and fixed, improving structural rigidity and long-term operational reliability. The support column is fixed to the inner wall of the F-type return oil pipe A1. One end of the compression spring A2 is fixed to the support column, and the other end is connected to the activated valve plate A3. The support columns are evenly arranged circumferentially along the inner wall of the return oil pipe A1 to guide the axial movement of the activated valve plate A3, preventing deflection and jamming, and ensuring a smooth and reliable multi-stage opening process. The compression spring A2 provides an initial closing force through a preset compression amount, allowing the activated valve plate A3 to tightly adhere to and fix the valve plate A4 under low oil pressure, ensuring sealing.

[0033] This invention establishes a stable elastic reset structure by installing a support column on the inner wall of the return oil pipe A1 and fixing one end of the compression spring A2 to the support column and connecting the other end to the activation valve plate A3. When the oil pressure decreases, the compression spring A2 pushes the activation valve plate A3 back, causing the two valve plates to re-fit and close the return oil passage. This structure ensures reliable valve plate operation and rapid response, effectively avoiding accidental opening caused by vibration or oil flow pulsation. It also facilitates assembly and positioning, improving the compactness and durability of the overall structure.

[0034] As a further improvement of the present invention, the upper support oil tank 4 is connected to the back pressure oil groove 3 through the PTFE sealing ring B1 (which has a certain pressure reduction effect), providing pressure to the back of the moving plate 2 and forming a sealed fit with the stationary plate 1. The PTFE sealing ring B1 reduces pressure and connects to the back pressure oil groove 3, which ensures the back pressure supply of the moving plate 2 and avoids excessive pressure impact.

[0035] This invention connects the upper support oil sump 4 and the back pressure oil groove 3 through a PTFE sealing ring B1, and dynamically adjusts the back pressure of the moving plate 2 using the return oil pressure to achieve adaptive fitting of the main sealing line. The PTFE material has excellent oil resistance and low friction characteristics, ensuring stable sealing performance and minimal wear. During compressor start-up, shutdown, and variable load operation, the back pressure is automatically adjusted according to the oil circuit opening and closing, effectively avoiding high pressure leakage and low pressure desorption, significantly improving the sealing life and system dust holding capacity, while reducing frictional power consumption and contributing to the optimization of overall machine energy efficiency.

[0036] As a further improvement of the present invention, the elastic force of the elastic element located at the lower support oil sump 7 is greater than that of the elastic element located at the upper support oil sump 4. By differentiating the elastic forces of the elastic elements at the upper and lower support oil sump 7, the opening pressure threshold of the valve plate on the lower support side is higher than that on the upper support side, realizing graded response control and graded pressure setting. The upper support prioritizes maintaining back pressure, while the lower support handles high-speed pressure relief, covering the entire operating range. When the compressor is running at low load, the oil return channel on the upper support side opens first to maintain the basic back pressure. When the system load increases and the oil pressure rises to a higher level, the valve plate on the lower support side overcomes the greater elastic force to open and participate in the oil return regulation. This gradient design effectively avoids pressure fluctuations caused by simultaneous action on both sides, improves the back pressure regulation accuracy and dynamic response stability, and further optimizes the energy efficiency performance of the compressor in a wide operating range.

[0037] Example 2: The present invention provides a compressor including an oil return pipe mechanism 5. The compressor of this invention employs an oil return pipe mechanism 5 to effectively balance the axial force on the moving plate 2 and suppress vibration and impact under high-speed operation. During variable operating conditions, the back pressure is precisely adjusted through a multi-stage valve-controlled oil return mechanism to ensure that the main sealing line is always in the best fit. At the same time, the PTFE sealing ring B1 and the misaligned valve plate structure work together to improve the system response speed and sealing reliability. The whole machine operates more smoothly and efficiently, significantly reducing noise and energy consumption, extending service life, and meeting the stringent requirements of high-performance compressors for stability and energy efficiency.

[0038] As a further improvement of the present invention, it also includes a crankshaft oil passage 6, an oil pump 9 and a bottom oil sump 10. The oil pump 9 supplies oil to the upper support oil sump 4 and the lower support oil sump 7 through the crankshaft oil passage 6. The return oil pipe mechanism 5 leads the excess oil back to the bottom oil sump 10. Together with the crankshaft oil passage 6 and the oil pump 9, it realizes closed-loop oil supply and drain control.

[0039] The compressor also includes a stationary plate 1, a moving plate 2, a back pressure oil sump 3, an upper support oil sump 4, a lower support oil sump 7, and an oil pump drive 8. Oil is transported from the bottom oil sump 10 to the upper and lower support oil sump 7 via the oil pump 9 and crankshaft oil passage 6, and then returned to the bottom oil sump 10 as needed by the return oil pipe mechanism 5. The return oil pipe mechanism 5 is located slightly below the center and uses return oil pipe A1 (e.g., ...). Figure 2 , Figure 3 , Figure 8 Two of its branches are connected to the upper support oil tank 4 and the lower support oil tank 7 respectively, and the third branch is connected to the bottom oil tank 10. A support column is installed inside the pipe and welded to the inner wall. Spring A2 is fixed to the support column, and the activating valve plate A3 and the fixed valve plate A4 are attached to the inside of the pipe.

[0040] The activating valve plate A3 and the fixing valve plate A4 are circular thin sheets, each with a through hole. When they are fitted together, the solid parts and the through holes mutually shield each other (e.g., Figure 2 , Figure 3 , Figure 4 The fixed valve plate A4 is fixed to the pipe wall, while the active valve plate A3 can slide along the pipe wall. Initially, the spring force of spring A2 causes the active valve plate A3 to press tightly against the fixed valve plate A4, closing the return oil passage. When the oil pressure in the sump increases, the oil's contact area pushes the active valve plate A3 to compress the spring A2, aligning the through-holes and forming a passage. The oil then flows into the bottom oil sump 10 through the return oil pipe A1. When the pressure drops, spring A2 resets, and the valve plate re-closes, closing the passage.

[0041] When the pressure in the upper support oil tank 4 rises to the first set value (the minimum pressure required to maintain the back pressure oil tank 3), the upper support oil return branch opens, drawing excess oil back to the bottom oil tank 10 to ensure the pressure in the back pressure oil tank 3 remains stable (e.g., ...). Figure 6 Oil flow direction). When the rotational speed continues to increase and the upper support branch is insufficient to relieve pressure, the pressure in the lower support oil sump 7 rises to the second set value, the lower support return oil branch opens, further relieving oil and preventing excessive pressure in the back pressure oil sump 3 from causing excessive contact between the moving and stationary discs 1 ( Figure 1 , Figure 8 ).

[0042] The upper support oil sump 4 is connected to the back pressure oil groove 3 through the PTFE sealing ring B1. This sealing ring has a moderate pressure reduction effect, which ensures that the back of the moving plate 2 obtains stable pressure and fits and seals with the stationary plate 1, while avoiding high pressure impact damage.

[0043] The oil return pipe mechanism 5 of this invention is directly installed at the oil sump 7 of the upper and lower supports. It utilizes the oil sump pressure to directly determine sufficient lubrication before releasing oil, avoiding the risks associated with indirect determination. This design also reduces the precision requirements for drilling holes in the supports, saving costs. Welding of the support pillars ensures the stability of spring A2.

[0044] The layout of this invention is more reasonable; the judgment conditions are direct and reliable; the processing cost is low; the multi-stage oil return channel solves the problem of insufficient high-frequency oil return flow; and the oil pump 9 pressure and oil pool gravity are used for activation, without the need for additional power.

[0045] The compressor of this invention works in coordination with the crankshaft oil circuit 6 and the oil pump 9 to achieve a stable oil supply to the upper and lower support oil sump 7, ensuring the lubrication and cooling of key friction pairs. The oil return pipe mechanism 5 efficiently returns excess oil to the bottom oil sump 10, avoiding oil accumulation and churning losses, further improving the circulation efficiency of the lubrication system. Under all operating conditions, the oil circuit is reasonably distributed, and the thermal management performance is excellent, effectively reducing mechanical wear and energy consumption, enhancing the compressor's adaptability to high temperature and high load environments, and ensuring long-term operational reliability and energy efficiency stability.

[0046] In one optional embodiment of the present invention, the compressor is a scroll compressor. The scroll compressor adopts the oil return pipe mechanism 5 and the staged valve control design, which opens and closes the oil return pipe A1 channel at different positions according to the compressor speed, and matches the corresponding oil return channel to different compressor operating conditions, thereby enabling the compressor to achieve a more stable and consistent operating state.

[0047] Applying the oil return pipe mechanism 5 to a scroll compressor can significantly improve the stability and energy efficiency of multi-condition operation.

[0048] The multi-stage adaptive oil return pipe mechanism 5 of the present invention includes an oil return pipe A1, a support column, a spring A2, an activation valve plate A3, and a fixed valve plate A4, connecting the upper support oil tank 4, the lower support oil tank 7, and the bottom oil tank 10. The activation valve plate A3 is slidable and initially adheres to the fixed valve plate A4 under the elastic force of the spring A2, blocking the channel; when the oil tank pressure rises to a set value, the oil pushes the activation valve plate A3 to overcome the resistance of the spring A2 and displace, opening the oil return channel. The upper support oil return branch opens first when the oil tank pressure reaches a first set value to maintain the pressure of the back pressure oil tank 3; when the rotational speed rises to a second set value, the lower support oil return branch opens to further relieve pressure.

[0049] The structure is located at the upper and lower support oil sump 7, and the valve plate opening and closing is directly controlled by the oil sump pressure to ensure that the oil is discharged after lubrication, thus reducing the requirements for machining accuracy. The support is welded to the inner wall of the oil return pipe A1, and the spring A2 is installed for stability. The oil return pipe mechanism 5 cooperates with the crankshaft oil circuit 6, oil pump 9, and bottom oil sump 10 to realize the return of excess oil.

[0050] When using, such as Figure 1 As shown, after the upper support oil tank 4 reaches the set pressure, the upper support oil return pipe mechanism 5 is opened to return the oil to the bottom oil tank 10. This prevents the oil return pipe A1 from starting to return oil when the crankshaft speed is low and the oil pump 9 has not yet filled the back pressure oil tank 3, which would lead to insufficient oil pressure in the back pressure oil tank 3 and adversely affect the operation of the pump. At the same time, when the lower support oil tank 7 reaches the set pressure, the lower support oil return pipe mechanism 5 is opened. This prevents the oil pump 9 from supplying too much oil when the crankshaft speed is high, as the upper support oil return pipe mechanism 5 alone cannot meet the pressure relief and oil discharge requirements, resulting in abnormal pressure in the upper support oil tank 4 and the back pressure oil tank 3.

[0051] Working principle: like Figure 5 and Figure 6 As shown, the return oil pipe mechanism 5 connects to the upper and lower support oil sump 7. As the crankshaft speed increases, the pressure in the entire oil circuit increases. After reaching the set oil sump pressure, the surface pressure of valve plate A3 increases, pushing spring A2 to contract and causing the return oil pipe mechanism 5 to open. Here, after satisfying the back pressure oil sump 3 pressure, the upper support return oil pipe mechanism 5 opens first, maintaining the back pressure oil sump 3 pressure and releasing excess oil pressure and fluid; as... Figure 7 and Figure 8 As shown, when the rotation speed continues to rise until the upper support oil return pipe mechanism 5 can no longer meet the pressure relief requirements, the lower support oil return pipe mechanism 5 opens to further maintain oil pressure stability and accelerate oil return efficiency, so as to avoid excessive oil pressure in the back pressure oil groove 3 and wear on the moving and stationary discs 1.

[0052] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A return oil pipe mechanism, characterized in that, include: Return oil pipe, elastic element, activating valve plate, fixed valve plate, upper support oil tank, lower support oil tank and bottom oil tank; The three ports of the return oil pipe are respectively connected to the upper support oil tank, the lower support oil tank and the bottom oil tank; The fixed valve plate is fixed at the first and second inlets of the return oil pipe, and the activated valve plate is located on the inner side of the return oil pipe inlet via the elastic element, and can slide along the pipe wall; In the initial state, the activated valve plate is pressed against the fixed valve plate by the elastic force of the elastic element to close the oil return channel; When the oil tank pressure rises to the set value, the oil pushes the activation valve plate to overcome the resistance of the elastic element and generate displacement, so as to open the corresponding oil return channel and allow the oil to flow back to the bottom oil tank.

2. The return oil pipe mechanism according to claim 1, characterized in that, Both the activating valve plate and the fixing valve plate are circular thin plates with through holes. When they are fitted together, the solid part and the through hole part cover each other, and the outer diameter of the valve plate matches the inner diameter of the return oil pipe.

3. The return oil pipe mechanism according to claim 2, characterized in that, The number of through holes on the activating valve plate is several, arranged around the outer ring of the activating valve plate; the number of through holes on the fixing valve plate is one, located at the center of the fixing valve plate.

4. The return oil pipe mechanism according to claim 1, characterized in that, The elastic element is a compression spring, and it also includes a support column, which is fixed to the inner wall of the return oil pipe; one end of the compression spring is fixed to the support column, and the other end is connected to the activation valve plate.

5. The return oil pipe mechanism according to claim 1, characterized in that, The upper support oil sump is connected to the back pressure oil groove through a PTFE sealing ring, which provides pressure to the back of the moving plate and forms a sealed fit with the stationary plate.

6. The return oil pipe mechanism according to claim 1, characterized in that, The elastic force of the elastic element located at the lower support oil tank is greater than that of the elastic element located at the upper support oil tank.

7. A compressor, characterized in that, Includes the return pipe mechanism as described in any one of claims 1 to 6.

8. The compressor according to claim 7, characterized in that, It also includes a crankshaft oil circuit, an oil pump, and a bottom oil sump. The oil pump supplies oil to the upper support oil sump and the lower support oil sump through the crankshaft oil circuit, and the oil return pipe mechanism returns excess oil to the bottom oil sump.

9. The compressor according to claim 7, characterized in that, The compressor is a scroll compressor.

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