Oil circuit structure for rotary machinery and scroll compressor having the same

Abstract

The present invention provides an oil circuit structure for a rotary machine, wherein a pump oil circuit is formed on a rotating part of the rotary machine, wherein the rotating part includes a drive shaft and a motor rotor, wherein the bottom of the drive shaft is inserted in an oil storage area, and the motor rotor is mounted on the drive shaft and rotates together with the drive shaft in a fixed manner; the pump oil circuit extends along the drive shaft, and can realize the extraction and transportation of lubricating oil from the oil storage area through centrifugal action by virtue of the rotation of the drive shaft. The present invention uses the centrifugal force when the drive shaft rotates to allow the lubricating oil to be extracted from the oil storage area to a location to be lubricated, and the structure is arranged inside the drive shaft, and the extraction and transportation of lubricating oil is realized without adding other external structures, thereby providing a better lubrication effect for the friction location.

Description

Technical Field

[0001] The invention relates to an oil circuit structure, in particular to an oil circuit structure for a rotary machine and a scroll compressor having the same. Background Art

[0002] There are many mechanical transmission structures that use friction transmission. For friction transmission structures, it is necessary to treat the friction transmission with lubricating oil. For example, the friction transmission between the orbiting scroll and the stationary scroll in a scroll compressor. The scroll compressor has the advantages of high volumetric efficiency, high energy efficiency ratio, low vibration, and high speed, which makes it popular. Due to its high operating speed, the lack of lubricating oil in the system will seriously affect the operation of the scroll compressor.

[0003] At present, the compression chamber surrounded by the moving and stationary scrolls can be lubricated by the lubricating oil in the gas, but the space at the bottom of the moving disk is relatively sealed, and it is difficult to lubricate it with the lubricating oil in the refrigerant. This requires an efficient lubrication solution to solve this problem. Summary of the invention

[0004] In view of this, the present invention provides an oil passage structure that enables the drive shaft to realize the flow of lubricating oil from the oil storage area to the friction area through centrifugal force, specifically:

[0005] The present invention provides an oil circuit structure for a rotary machinery, wherein a pump oil circuit is formed on a rotating component of the rotary machinery, wherein the rotating component comprises a drive shaft and a motor rotor, wherein the bottom of the drive shaft is inserted in an oil storage area, and the motor rotor is sleeved on the drive shaft and fixedly cooperates with the drive shaft to rotate together; the pump oil circuit extends along the drive shaft, and can realize the extraction and transportation of lubricating oil from the oil storage area through centrifugal action with the help of the rotation of the drive shaft.

[0006] It is further preferred that the drive shaft is installed vertically, and the pump oil circuit includes a first oil circuit, a second oil circuit, and a third oil circuit. An oil suction port is formed at the bottom of the drive shaft and communicates with the oil storage area. The first oil circuit starts from the oil suction port and extends obliquely upward along the drive shaft to the fixed matching area between the drive shaft and the rotor; in the fixed matching area between the drive shaft and the rotor, a second oil circuit is formed, one end of the second oil circuit is connected to the first oil circuit, and the other end is connected to the third oil circuit. The third oil circuit extends obliquely upward along the drive shaft to the top of the drive shaft in a direction that deviates from the first oil circuit; thereby, a smooth oil passage that adapts to the rotation of the drive shaft is formed.

[0007] It may be further preferred that the second oil circuit is a closed oil channel formed by a spiral groove formed on the outer circumferential surface of the drive shaft and an inner circumferential surface of the motor rotor.

[0008] It is further preferred that the rotation direction of the spiral groove is the same as the rotation direction of the drive shaft.

[0009] It may be further preferred that the second oil circuit is a closed oil channel formed by a vertical groove formed on the outer circumferential surface of the drive shaft and the inner circumferential surface of the motor rotor.

[0010] It is further preferred that the oblique upward direction of the first oil circuit and the oblique upward direction of the third oil circuit are both consistent with the rotation direction of the rotating shaft.

[0011] It may be further preferred that the first oil circuit and the third oil circuit rise in a spiral on the drive shaft, and the spiral direction is the same as the rotation direction of the drive shaft.

[0012] It is further preferred that the first oil circuit and the third oil circuit rise linearly on the drive shaft.

[0013] It may be further preferred that the bottom of the drive shaft is supported in the oil storage area via a pair of bearings.

[0014] It is further preferred that the top drive of the drive shaft is connected to a working component, and the working component and the static component are matched together dynamically and statically. After the lubricating oil is transported to the top of the drive shaft, it flows to the dynamic and static matching gap between the working component and the static component.

[0015] It is further preferred that an oil collecting chamber is formed at the top of the driving shaft, a working gas chamber is formed between the working component and the static component, a medium-pressure hole is provided at the top of the oil collecting chamber to communicate with the working gas chamber, and an oil return hole is provided at the bottom of the oil collecting chamber to communicate with the space above the oil storage area.

[0016] It is further preferred that the rotary machine is a rotary compressor, and the drive shaft is a crankshaft.

[0017] The present invention also provides a scroll compressor, which has the oil circuit structure described above, wherein the static component includes a static scroll plate and an upper bracket, and the working component includes a movable scroll plate, an eccentricity adjustment member, a crank pin, a main bearing, and a movable plate bearing, wherein the upper bracket is fixed together with the static scroll plate, the main bearing is mounted on the upper bracket, the drive shaft is rotatably supported on the upper bracket through the main bearing, the eccentricity adjustment member is fixed to the drive shaft through the crank pin, and the movable scroll plate is rotatably mounted on the eccentricity adjustment member through the movable plate bearing, and an oil collecting chamber is formed between the bottom of the movable plate bearing and the groove at the top of the upper bracket.

[0018] The present invention arranges an oil circuit structure in the drive shaft, and the centrifugal force when the drive shaft rotates allows the lubricating oil to be drawn from the oil storage area to the place to be lubricated. The structure is arranged inside the drive shaft, and the drawing and transportation of the lubricating oil is achieved without adding other external structures, thereby providing a better lubrication effect for the friction part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail its exemplary embodiments with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present disclosure, and it is clear to a person skilled in the art that other accompanying drawings can be obtained from these accompanying drawings without creative work.

[0020] Figure 1 1 is a schematic cross-sectional view of a scroll compressor crankshaft pump oil structure according to a third embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of the crankshaft oil passage structure of the scroll compressor crankshaft pump oil structure according to Embodiment 3 of the present invention;

[0022] Figure 3 1 is a schematic cross-sectional view of a scroll compressor crankshaft pump oil structure according to a fourth embodiment of the present invention;

[0023] Figure 4 4 is a cross-sectional view of the crankshaft oil channel structure of the scroll compressor crankshaft pump oil structure of the present invention.

[0024] In the figure:

[0025] 1-head cover; 2-static scroll; 3-orbiting scroll; 31-medium pressure hole; 4-upper bracket; 41-oil return hole; 5-eccentricity adjustment piece; 6-crank pin; 61-crank pin oil hole; 7-crankshaft; 71-first crankshaft oil hole; 72-spiral oil channel; 73-second crankshaft oil hole; 8-casing; 9-motor stator; 10-compressor suction port; 11-secondary bearing; 12-motor rotor; 13-main bearing; 14-oil storage area; 15-anti-rotation limit pin; 16-moving plate bearing; 17-circlip; 18-compressor exhaust port; S-oil collecting chamber DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0028] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0030] The present invention forms an oil pumping circuit along the axial direction of the drive shaft through the rotating part of the rotary machine, and when the drive shaft rotates, the lubricating oil in the oil storage area at the bottom of the drive shaft is drawn and transported from the oil storage area to the friction area through the oil pumping circuit. In order to better explain the technical solution of the present invention, the following embodiments are used for illustration.

[0031] Embodiment 1:

[0032] The present embodiment provides an oil circuit structure for a rotary machinery, wherein an oil pump circuit is formed on a rotating component of the rotary machinery, wherein the rotating component includes a drive shaft and a motor rotor 12, wherein the drive shaft is vertically mounted, and the bottom of the drive shaft is inserted into an oil storage area 14, and the motor rotor 12 is sleeved on the drive shaft and fixedly cooperates with the drive shaft to rotate together; the oil pump circuit extends along the drive shaft, and can realize the extraction and transportation of lubricating oil from the oil storage area 14 through centrifugal action with the help of the rotation of the drive shaft, thereby better utilizing the centrifugal force generated by the operation of the drive shaft to realize the extraction of lubricating oil.

[0033] Preferably, the pump oil circuit includes a first oil circuit, a second oil circuit, and a third oil circuit. An oil suction port is formed at the bottom of the drive shaft and communicates with the oil storage area 14 for drawing lubricating oil during rotation. The first oil circuit starts from the oil suction port and extends obliquely upward along the drive shaft to the fixed matching area between the drive shaft and the rotor; in the fixed matching area between the drive shaft and the rotor, a second oil circuit is formed, one end of the second oil circuit is connected to the first oil circuit, and the other end is connected to the third oil circuit. The third oil circuit extends obliquely upward along the drive shaft to the top of the drive shaft in a deviation direction opposite to the first oil circuit (viewed from the radial direction); thereby forming a smooth oil passage that adapts to the rotation of the drive shaft.

[0034] Preferably, the second oil passage is a closed oil passage formed by the spiral groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor 12, so that when the drive shaft rotates, the rotation direction of the spiral groove is the same as the rotation direction of the drive shaft due to centrifugal force. By forming a closed oil passage, the centrifugal force on the lubricating oil during movement is prevented from being reduced, thereby providing reliability in lubricating oil delivery.

[0035] Preferably, the upward oblique direction of the first oil circuit and the upward oblique direction of the third oil circuit are both consistent with the rotation direction of the rotating shaft (viewed from the axial direction). The first oil circuit and the third oil circuit spirally rise on the drive shaft, and the spiral direction is the same as the rotation direction of the drive shaft, thereby avoiding additional resistance when the lubricating oil passes through the oil circuit, ensuring that the lubricating oil can be better transmitted to the area to be lubricated.

[0036] Preferably, the first oil circuit and the third oil circuit rise linearly on the drive shaft, providing a greater centrifugal force for the movement of the lubricating oil in the oil circuit, thereby facilitating the direct delivery of the lubricating oil to the third oil circuit.

[0037] Preferably, the bottom of the drive shaft is supported on the oil storage area 14 through a pair of bearings 11, and the lubricating oil in the oil storage area 14 flows into the bottom of the drive shaft through the gap between the drive shaft and the bearing.

[0038] Preferably, the top drive of the drive shaft is connected to the working component, and the working component and the static component are matched together dynamically and statically. After the lubricating oil is transported to the top of the drive shaft, it flows to the dynamic and static matching gap between the working component and the static component.

[0039] Preferably, an oil collecting chamber S is formed at the top of the driving shaft, and a working gas chamber is formed between the working component and the static component. A medium-pressure hole 31 is provided at the top of the oil collecting chamber S to communicate with the working gas chamber, and an oil return hole 41 is provided at the bottom of the oil collecting chamber S to communicate with the space above the oil storage area 14, so as to realize the reflux of the lubricating oil, reduce the retention of the lubricating oil between the components, and realize the recycling of the lubricating oil.

[0040] Preferably, the rotary machine is a rotary compressor, the driving shaft is a crankshaft 7 , and the rotation of the crankshaft 7 is used to extract and transport the lubricating oil.

[0041] This embodiment designs an oil circuit structure of a rotary machine, opens an oil circuit at the bottom of the drive shaft, uses the centrifugal force generated by the rotation of the drive shaft to draw the lubricating oil in the oil storage area 14, and transports it to the friction point through other oil circuits. The oil circuit is designed to allow the lubricating oil to be recycled.

[0042] Alternatively, the second oil circuit may also be a closed oil channel formed by a vertical groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor 12 .

[0043] Embodiment 2:

[0044] Compared with Example 1, this embodiment makes changes to the second oil circuit structure, specifically:

[0045] The second oil circuit is a closed oil passage formed by the spiral groove formed on the inner circumference of the motor rotor and the outer circumference of the drive shaft. Of course, the second oil circuit can also be selected to be a closed oil passage formed by the vertical groove formed on the inner circumference of the rotor and the outer circumference of the drive shaft.

[0046] A spiral groove or a vertical groove is provided on the inner circumference of the rotor to avoid providing a groove on the drive shaft which may reduce the reliability of the drive shaft and extend the service life of the drive shaft.

[0047] The other structures of the oil circuit in this embodiment have been described in Embodiment 1 and will not be repeated here.

[0048] Embodiment 3:

[0049] This embodiment provides a scroll compressor. This embodiment is described by taking the application of the second oil path in Embodiment 1 as a closed oil channel formed by the spiral groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor 12 in the scroll compressor as an example, specifically:

[0050] The scroll compressor has the oil circuit structure described in Example 1, and also includes a head cover 1, a casing 8, a compressor air intake port 10, a motor stator 9, an anti-rotation limit pin 15, a retaining spring 17 and a compressor exhaust port. The head cover 1 and the casing 8 are fixedly arranged, the compressor exhaust port 18 is arranged at one end of the head cover 1 for discharging the compressed gas, and the compressor air intake port 10 is arranged at the bottom of the casing 8 for sucking in air; the motor stator 9 and the motor rotor 12 are matched and connected to form a complete motor structure, the motor stator 9 is pressed into the crankshaft 7 with interference fit, and the outer peripheral surface of the motor stator 9 is fixed to an inner side surface of the casing 8, and a gap is formed between the outer peripheral surface of the motor stator 9 and the other inner side surface of the casing 8 for forming a lubricating oil reflux channel; a certain number of circular grooves are opened at the bottom of the movable scroll 3, and cooperate with the anti-rotation limit pin 15 to prevent the movable scroll 3 from rotating. The drive shaft is rotatably supported on the upper bracket 4 through the main bearing 13.

[0051] The static components in the oil circuit structure include a static scroll plate 2 and an upper bracket 4, and the working components include a movable scroll plate 3, an eccentricity adjustment member 5, a crank pin 6, a main bearing 13, and a movable plate bearing 16. The static scroll plate 2 is fixed on the head cover 1, the upper bracket 4 is interference-fitted into the casing 8, the main bearing 13 is installed on the upper bracket 4, and a wear-resistant sheet is placed between the upper bracket 4 and the movable scroll plate 3. This wear-resistant sheet is made of a material with good wear resistance to prevent wear on the back of the movable plate or the end face of the bracket, thereby improving the reliability of the compressor. The crank pin 6 is eccentrically and interference-pressed into the hole opened on the upper end face of the crankshaft 7. A retaining spring 17 is provided at the connection between the crank pin 6 and the upper bracket 4 to avoid collision between the crank pin and the upper bracket when the crankshaft moves, and to provide a gap for the lubricating oil to flow and lubricate. The crank pin 6 is hollow to form a crank pin oil hole 61, which facilitates the lubricating oil to reach the movable scroll and the upper bracket 4 along the crank pin 6 oil circuit to achieve lubrication here. The connection gap between the crank pin 6 and the moving plate is provided with a moving plate bearing 16 and an eccentric adjusting member. The eccentric adjusting member 5 is fixed on the driving shaft through the crank pin 6. The function of this eccentric adjusting member is to enable the compressor to achieve fine adjustment of the moving plate eccentricity during operation. An interference fit is adopted between the crankshaft 7 and the motor rotor 12. The inner surface of the motor stator 9 and the spiral channel on the surface of the crankshaft 7 together form a closed oil channel. The driving shaft is rotatably supported on the upper bracket 4 through the main bearing 13 to improve the stability of the driving bearing movement, and the third oil circuit formed has a passage at the main bearing 13. Here, the third oil circuit, namely the second crankshaft oil hole 73, can achieve lubrication of the main bearing 13. The oil collecting chamber (S) is formed between the bottom of the moving plate bearing 16 and the groove on the top of the upper bracket 4 to achieve the reflux of the lubricating oil.

[0052] The path of the lubricating oil in this embodiment is:

[0053] The oil in the compressor oil storage area 14 enters the bottom of the crankshaft 7 through the gap of the auxiliary bearing 11. When the compressor is running, the oil at the bottom of the crankshaft 7 is thrown from the first oil path into the second oil path under the action of centrifugal force, and continues to be subjected to centrifugal force in the second oil path, and then flows out from the third oil path of the channel, flows through the crank pin 6, and the oil from the crank pin 6 oil path flows into each friction component to complete lubrication. The first oil path mentioned here is the first crankshaft oil hole 71, the second oil path is the spiral oil channel, and the third oil path is the second crankshaft oil hole 71.

[0054] Due to the existence of the medium-pressure hole 31, the space enclosed by the upper bracket 4 and the static vortex plate 2 is a medium-pressure zone. Therefore, the lubricated oil is collected in the oil collecting chamber (S) under the action of gravity and the pressure difference between the medium and low pressure zones and flows back to the oil storage area 14 along the reflux hole, completing a cycle.

[0055] Embodiment 4:

[0056] This embodiment is described by taking the example of the second oil passage being a closed oil passage formed by the vertical groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor 12 in the third embodiment, specifically:

[0057] In the oil circuit structure of this embodiment, the second oil circuit is a closed oil channel formed by the vertical groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor 12. The other structures in this embodiment have been described in Examples 1 to 3 and will not be repeated here.

[0058] For embodiments 1-4, the first oil circuit and the third oil circuit can be either linear oil circuits or spiral oil circuits, but considering the ease of processing, the linear type is preferred in this embodiment.

[0059] The present invention sets an oil circuit in the crankshaft and uses the centrifugal force generated by the rotation of the crankshaft to lift the lubricating oil to the area to be lubricated, thereby ensuring the normal operation of the mechanical structure and extending the service life. In addition, the lubrication inside the compressor is achieved without adding other devices. The lubricating oil reflux hole achieves the recycling of the lubricating oil, reduces the number of times the lubricating oil is added, and more effectively achieves the lubrication of the mechanical structure.

[0060] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A scroll compressor, characterized in that: An oil pump circuit is formed on a rotating component of the scroll compressor, the rotating component comprising a drive shaft and a motor rotor (12), the bottom of the drive shaft being inserted into an oil storage area (14), the motor rotor (12) being sleeved on the drive shaft and fixedly matched with the drive shaft for rotation; the oil pump circuit extends along the drive shaft, and can extract and transport lubricating oil from the oil storage area (14) through centrifugal action by virtue of the rotation of the drive shaft; the drive shaft is vertically installed, the oil pump circuit comprises a first oil circuit, a second oil circuit, and a third oil circuit, an oil suction port is formed at the bottom of the drive shaft and communicates with the oil storage area (14), the first oil circuit starts from the oil suction port and extends obliquely upward along the drive shaft to a fixed matching area between the drive shaft and the rotor; a second oil circuit is formed in the fixed matching area between the drive shaft and the rotor, one end of the second oil circuit is connected to the first oil circuit, and the other end is connected to the third oil circuit, the third oil circuit extends obliquely upward along the drive shaft to the top of the drive shaft in a direction deviating from the first oil circuit; Thus, a smooth oil passage adapted to the rotation of the drive shaft is formed; when the compressor is running, the lubricating oil flows through the first oil passage, the second oil passage and the third oil passage in sequence.

2. The scroll compressor according to claim 1, characterized in that: The second oil circuit is a closed oil channel formed by a spiral groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor (12).

3. The scroll compressor according to claim 2, characterized in that: The rotation direction of the spiral groove is the same as the rotation direction of the driving shaft.

4. The scroll compressor according to claim 1, wherein: The second oil circuit is a closed oil channel formed by a vertical groove formed on the outer circumference of the drive shaft and the inner circumference of the motor rotor, or the second oil circuit is a closed oil channel formed by a vertical groove formed on the inner circumference of the motor rotor and the outer circumference of the drive shaft.

5. The scroll compressor according to any one of claims 1 to 3, characterized in that: The oblique upward direction of the first oil passage and the oblique upward direction of the third oil passage are both consistent with the rotation direction of the rotating shaft.

6. The scroll compressor according to claim 1, wherein: The first oil circuit and the third oil circuit spirally ascend on the drive shaft, and the spiral direction is the same as the rotation direction of the drive shaft.

7. The scroll compressor according to claim 1, wherein: The first oil passage and the third oil passage rise linearly on the drive shaft.

8. The scroll compressor according to any one of claims 1 to 4, characterized in that: The bottom of the drive shaft is supported in the oil storage area (14) via a pair of bearings (11).

9. The scroll compressor according to any one of claims 1 to 4, characterized in that: The top drive of the driving shaft is connected to the working component, and the working component and the static component are matched together. After the lubricating oil is transported to the top of the driving shaft, it flows to the dynamic and static matching gap between the working component and the static component.

10. The scroll compressor according to claim 9, characterized in that: An oil collecting chamber (S) is formed at the top of the driving shaft, and a working gas chamber is formed between the working component and the static component. A medium-pressure hole is provided at the top of the oil collecting chamber (S) to communicate with the working gas chamber, and an oil return hole is provided at the bottom of the oil collecting chamber (S) to communicate with the space above the oil storage area.

11. The scroll compressor according to any one of claims 1 to 4, characterized in that: The drive shaft is a crankshaft (7).

12. The scroll compressor according to claim 10, characterized in that: The static component comprises a static scroll (2) and an upper bracket (4), and the working component comprises a movable scroll (3), an eccentricity adjustment member (5), a crank pin (6), a main bearing (13), and a movable disk bearing (16), wherein the upper bracket (4) is fixed together with the static scroll (2), the main bearing (13) is mounted on the upper bracket (4), the drive shaft is rotatably supported on the upper bracket (4) via the main bearing (13), the eccentricity adjustment member (5) is fixed to the drive shaft via the crank pin (6), the movable scroll (3) is rotatably mounted on the eccentricity adjustment member (5) via the movable disk bearing (16), and the oil collecting chamber (S) is formed between the bottom of the movable disk bearing (16) and the groove at the top of the upper bracket (4).

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