Scroll compressor crankshaft support structure

Abstract

The application discloses a scroll compressor crankshaft support structure, aiming at solving the problem that the end face of the bottom of the crankshaft is prone to serious wear due to the small area of the support bottom in the prior art, and finally leading to the failure of the compressor. The application solves the above technical problems through the following technical scheme: a crankshaft; a support bearing sleeve is arranged outside the crankshaft and below the crankshaft, and the bottom end face of the support bearing is a support end face; a bottom bearing is arranged at the bottom of the crankshaft, the upper end face of the bottom bearing is an abutting end face, and the support end face and the abutting end face abut. In the application, the support end face and the abutting end face cooperate to support the whole shafting of the crankshaft, the support area is increased, and the wear of the crankshaft is effectively prevented; the first oil hole can continuously lubricate the space between the abutting end face and the support end face, the friction between the abutting end face and the support end face is reduced, and the service life of the support bearing and the bottom bearing is prolonged.

Description

Technical Field

[0001] This invention relates to the field of scroll compressor technology, and more specifically, to a crankshaft support structure for a scroll compressor. Background Technology

[0002] The crankshaft support bearing of a scroll compressor is generally supported by the bottom of the crankshaft. However, due to the small diameter of the crankshaft, the support area of ​​the crankshaft is relatively small. The weight of the crankshaft system is supported by this small support surface. As the operating time increases, the end face of the crankshaft and the support surface of the bottom bearing will experience severe wear, eventually leading to compressor failure. Summary of the Invention

[0003] This invention overcomes the shortcomings of existing technologies where the crankshaft bottom end face is prone to severe wear due to the relatively small area of ​​the crankshaft support bottom, ultimately leading to compressor failure. It provides a crankshaft support structure for a scroll compressor that increases the axial support area of ​​the crankshaft, thereby reducing the support pressure and maintaining the continuity of the support area.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a crankshaft support structure for a scroll compressor, characterized in that it comprises: Crankshaft; The support bearing is sleeved on the outside of the crankshaft and located below the crankshaft, with the bottom end face of the support bearing serving as the support end face; The bottom bearing is located at the bottom of the crankshaft. The upper end face of the bottom bearing is the abutment end face, and the support end face and the abutment end face abut against each other.

[0005] In this invention, the cooperation between the supporting end face and the abutting end face enables the entire crankshaft shaft system to be supported, increasing the supporting area and effectively preventing crankshaft wear. At the same time, the cooperation between the first oil hole and the lubrication cavity enables continuous lubrication between the abutting end face and the supporting end face, reducing the friction between the abutting end face and the supporting end face, and improving the service life of the supporting bearing and the bottom bearing.

[0006] Preferably, the inner ring edge of the supporting end face is provided with a first chamfer structure, and the inner ring surface of the abutting end face is provided with a second chamfer structure. The first chamfer structure, the second chamfer structure and the outer wall of the crankshaft cooperate to form a lubrication cavity.

[0007] The lubrication cavity continuously lubricates the supporting end face and the abutting end face, reducing the friction between them.

[0008] Preferably, an oil passage is provided inside the crankshaft along its axial direction, and a first oil hole is provided on the side wall of the oil passage, which penetrates the lubrication cavity.

[0009] Oil is pumped into the oil passage by an oil pump, so that the lubricating oil flows into the lubrication cavity through the first oil hole. Then, the lubricating oil enters the friction pair formed by the abutting end face and the supporting end face through the lubrication cavity, thereby reducing the friction between the abutting end face and the supporting end face.

[0010] Preferably, the oil passage is eccentrically positioned.

[0011] The oil passage's axis does not coincide with the crankshaft's axis; the oil passage's axis is eccentrically positioned relative to the crankshaft's axis. This eccentric positioning of the oil passage allows centrifugal force to propel the lubricating oil from the first oil hole into the lubrication chamber when it enters the oil passage, thereby improving the lubrication chamber's oil intake efficiency.

[0012] Preferably, the inner wall of the bottom bearing is provided with an annular oil groove along its circumference; the inner wall of the bottom bearing is provided with several vertical oil grooves along its axial direction, the vertical oil grooves connecting the annular oil grooves and the lubrication cavity; the bottom end of the crankshaft is provided with a mounting hole, and the side wall of the mounting hole is provided with a second oil hole communicating with the annular oil groove.

[0013] Because a second oil hole is used for oil inlet, and multiple second oil holes can be set, during the oil inlet process, the lubricating oil first fills the annular oil groove, and then enters the lubrication cavity through the vertical oil groove. During this process, the lubricating oil enters the lubrication cavity synchronously from the vertical oil groove, so that the circumference of the lubrication cavity is quickly and evenly filled with lubricating oil, thereby improving the lubrication effect.

[0014] Preferably, the supporting end face is provided with a plurality of radially arranged end face oil grooves in the circumferential direction.

[0015] The end-face oil groove allows lubricating oil in the lubrication chamber to flow out smoothly, ensuring its return to the oil sump at the bottom of the compressor. Furthermore, as the lubricating oil flows within the end-face oil groove, the crankshaft drives the support bearing to rotate, causing the oil groove to lubricate the support end face. This effectively creates a continuous oil film on the support end face, further enhancing lubrication between the support end face and the contact end face.

[0016] Preferably, an inclined baffle is provided at the end of the first oil hole near the oil passage, with the end face of the inclined baffle inclined downward.

[0017] The inclined baffle reduces the amount of impurities entering the lubrication cavity from the first and second oil holes, preventing damage to the contact and lubrication surfaces. Since the lubricating oil flows upward along the oil passage by the action of the oil pump, setting the inclined baffle downwards causes the lubricating oil to decompose when it collides with the inclined baffle during its upward flow, allowing some of the oil to move into the inclined baffle, thereby improving the oil intake efficiency of the first oil hole.

[0018] Preferably, a hinge plate is fixedly installed below the first oil hole, and the bottom of the inclined baffle is rotatably connected to the hinge plate; an elastic rod is installed above the first oil hole, and the top of the inclined baffle is connected to the elastic rod.

[0019] When the lubricating oil flows in the oil passage, it acts on the inclined baffle, causing the inclined baffle to rotate with its hinge point below it as the rotation point, thereby allowing impurities on the inclined baffle to fall off.

[0020] As a preferred option, the support bearing is interference-fitted with the crankshaft.

[0021] The support bearing is fixedly mounted on the crankshaft by interference fit.

[0022] Compared with the prior art, the beneficial effects of the present invention are: (1) By the cooperation of the supporting end face and the abutting end face, the entire crankshaft shaft system can be supported, increasing the support area; at the same time, by the cooperation of the first oil hole and the lubrication cavity, continuous lubrication can be provided between the abutting end face and the supporting end face, reducing the friction between the abutting end face and the supporting end face, and improving the service life of the supporting bearing and the bottom bearing. (2) Oil is introduced through the second oil hole. During the oil introduction process, the lubricating oil first fills the annular oil groove, and then enters the lubrication cavity through the vertical oil groove. During this process, the lubricating oil enters the lubrication cavity from the vertical oil groove simultaneously, so that the circumference of the lubrication cavity is quickly and evenly filled with lubricating oil, thus making the lubrication effect better. (3) The end face oil groove allows the lubricating oil in the lubrication chamber to flow out from the end face oil groove, so that the lubricating oil can flow smoothly and return to the oil sump at the bottom of the compressor. In addition, when the lubricating oil flows in the end face oil groove, the crankshaft drives the support bearing to rotate, which will cause the end face oil groove to lubricate the support end face, which is equivalent to continuously attaching a layer of oil film on the support end face, so that the support end face and the contact end face are continuously lubricated, further improving the lubrication effect between the support end face and the contact end face. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the present invention; Figure 2 yes Figure 1 A magnified view of a portion of the image; Figure 3 This is a three-dimensional structural diagram of one type of bottom bearing of the present invention; Figure 4 This is a three-dimensional structural diagram of another structure of the bottom bearing of the present invention; Figure 5 This is a schematic diagram of the structure in Embodiment 4 of the present invention; Figure 6 This is a schematic diagram of the structure in Embodiment 5 of the present invention; In the diagram: 1. Housing, 2. Crankshaft, 21. Oil passage, 22. First oil hole, 23. Mounting hole, 24. Second oil hole, 3. Bottom bearing, 31. Butt hole, 32. Abutting end face, 321. Second chamfer structure, 33. Annular oil groove, 34. Vertical oil groove, 35. End face oil groove, 4. Support bearing, 41. Supporting end face, 411. First chamfer structure, 5. Inclined baffle, 6. Oil pump, 7. Hinge plate, 8. Elastic rod, 81. Mounting sleeve, 82. Sliding rod, 83. Abutting spring. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Refer to Figure 1 and Figure 2 As shown, a crankshaft support structure for a scroll compressor includes: a housing 1, a crankshaft 2 disposed inside the housing 1, a bottom bearing 3 disposed at the bottom of the crankshaft 2, and a support bearing 4 sleeved below the crankshaft 2 near the bottom bearing. The support bearing 4 is interference-fitted with the crankshaft 2, so that the support bearing 4 is fixedly connected to the crankshaft 2.

[0025] The bottom bearing 3 has a mating hole 31 at its center. The bottom of the crankshaft 2 is located inside the mating hole 31. An oil pump 6 is installed inside the mating hole 31. The oil pump 6 is used to pump the oil from the compressor oil sump upwards.

[0026] The bottom end face of the support bearing 4 is the support end face 41, and the upper end face of the bottom bearing 3 is the abutment end face 32. The abutment end face 32 and the support end face 41 abut against each other to form a pair of friction pairs, so that the abutment end face 32 supports the weight of the entire shaft system.

[0027] To reduce the friction between the supporting end face 41 and the abutting end face 32, a first chamfer structure 411 is provided on the inner ring edge of the supporting end face 41, and a second chamfer structure 321 is provided on the inner ring surface of the abutting end face 32. The first chamfer structure 411, the second chamfer structure 321, and the outer wall of the crankshaft 2 cooperate to form a lubrication cavity. An oil passage 21 is provided inside the crankshaft 2 along its axial direction, and a first oil hole 22 communicating with the lubrication cavity is provided through the side wall of the oil passage 21. Oil is pumped into the oil passage 21 by the oil pump 6, so that the lubricating oil flows into the lubrication cavity through the first oil hole 22. Then, the lubricating oil enters the friction pair formed between the abutting end face 32 and the supporting end face 41 through the lubrication cavity, thereby reducing the friction between the abutting end face 32 and the supporting end face 41.

[0028] To improve the efficiency of oil intake through the first oil hole 22, in this embodiment, the axis of the oil passage 21 is not aligned with the axis of the crankshaft 2; the axis of the oil passage 21 is eccentrically positioned relative to the axis of the crankshaft 2. Furthermore, the first oil hole 22 is located on the side of the oil passage 21 away from the axis of the crankshaft 2. This eccentrically positioned oil passage 21 allows, through centrifugal force, the lubricating oil to be thrown from the first oil hole 22 into the lubrication cavity when it enters the oil passage 21, thereby improving the oil intake efficiency of the lubrication cavity.

[0029] In this embodiment, the cooperation between the supporting end face 41 and the abutting end face 32 enables the entire shaft system of the crankshaft 2 to be supported, increasing the support area; at the same time, the cooperation between the first oil hole 22 and the lubrication cavity enables continuous lubrication between the abutting end face 32 and the supporting end face 41, reducing the friction between the abutting end face 32 and the supporting end face 41, and improving the service life of the supporting bearing 4 and the bottom bearing 3.

[0030] Example 2: Refer to Figures 1 to 3 As shown, this embodiment is similar in structure to embodiment 1, except that the inner sidewall of the bottom bearing 3 is provided with an annular oil groove 33 along its circumferential direction; the inner sidewall of the bottom bearing 3 is provided with a plurality of vertical oil grooves 34 along its axial direction. In this embodiment, there are three vertical oil grooves 34, which connect the annular oil groove 33 and the lubrication cavity; the bottom end of the crankshaft 2 is provided with a mounting hole 23, which is located at the bottom of the oil passage 21. The diameter of the mounting hole 23 is larger than the diameter of the oil passage 21. The sidewall of the mounting hole 23 is provided with a second oil hole 24 that communicates with the annular oil groove 33. The number of second oil holes 24 can be multiple, thereby improving the oil inlet efficiency of the second oil holes 24.

[0031] In Embodiment 1, lubrication of the contact end face 32 and the support end face 41 is achieved by introducing oil into the lubricating oil hole through the first oil hole 22. In order to further improve the lubrication efficiency, this embodiment discloses a second lubrication method, in which the lubricating oil enters the annular oil groove 33 through the second oil hole 24, then enters the vertical oil groove through the annular oil groove 33, and finally enters the lubrication cavity, thereby achieving lubrication of the contact end face 32 and the support end face 41.

[0032] In this embodiment, since the second oil hole 24 is used for oil inlet, the number of the second oil hole 24 can be set to multiple. During the oil inlet process, the lubricating oil first fills the annular oil groove 33, and then enters the lubrication cavity through the vertical oil groove. During this process, the lubricating oil enters the lubrication cavity from the vertical oil groove simultaneously, so that the circumference of the lubrication cavity is quickly and evenly filled with lubricating oil, thereby improving the lubrication effect.

[0033] Example 3: Reference Figures 1 to 4 As shown, this embodiment is structurally similar to Embodiment 1 or Embodiment 2, except that a plurality of radially arranged end-face oil grooves 35 are provided in the circumferential direction of the abutment end face 32. At least one end-face oil groove 35 is provided. The end-face oil grooves 35 allow the lubricating oil in the lubrication chamber to flow out, ensuring smooth flow and allowing the lubricating oil to return to the oil sump at the bottom of the compressor. Furthermore, when the lubricating oil flows within the end-face oil grooves 35, the crankshaft 2 drives the support bearing 4 to rotate, causing the end-face oil grooves 35 to lubricate the support end face 41. This is equivalent to continuously attaching an oil film to the support end face 41, thereby continuously lubricating the support end face 41 and the abutment end face 32, further improving the lubrication effect.

[0034] Example 4: Reference Figure 5 As shown, this embodiment is structurally similar to Embodiment 1, Embodiment 2, or Embodiment 3, except that an inclined baffle 5 is fixedly provided at one end of the first oil hole 22 near the oil passage 21. The end face of the inclined baffle 5 is inclined downwards, and filter holes are distributed on the inclined baffle 5. A filter screen is provided at the end of the second oil hole 24 near the crankshaft 2 axis.

[0035] In this embodiment, the inclined baffle 5 serves three purposes: First, it reduces the entry of impurities into the lubrication cavity from the first oil hole 22 and the second oil hole 24, preventing damage to the contact end face 32 and the lubrication end face. Second, since the lubricating oil flows upward along the oil passage 21 through the action of the oil pump 6, setting the inclined baffle 5 downward at an angle decomposes the speed of the lubricating oil when it collides with the inclined baffle 5 during its upward flow, allowing some of the oil to move into the inclined baffle 5, thereby improving the oil intake efficiency of the first oil hole 22. Third, when impurities adhere to the inclined baffle 5, since the inclined baffle 5 is set at an angle, some of the impurities will naturally fall downward when the machine stops working, thereby reducing the possibility of the inclined baffle 5 being blocked.

[0036] Example 5: Refer to Figure 6 As shown, this embodiment is similar in structure to embodiment 4, except that a hinge plate 7 is fixedly installed below the first oil hole 22, and the bottom of the inclined baffle 5 is rotatably connected to the hinge plate 7, with the bottom of the inclined baffle 5 hinged to the hinge plate 7; an elastic rod 8 is installed above the first oil hole 22, and the top of the inclined baffle 5 is connected to the elastic rod 8. The elastic rod 8 includes a mounting sleeve 81 and a sliding rod 82. The mounting sleeve 81 is fixedly installed on the inner side wall of the oil passage 21, and the sliding rod 82 is fixedly connected to the inclined baffle 5; the sliding rod 82 is slidably installed inside the mounting sleeve 81, and an abutment spring 83 is installed inside the mounting sleeve 81, with the abutment spring 83 abutting against the end of the sliding rod 82.

[0037] In this embodiment, with the above-mentioned settings, when the lubricating oil flows in the oil passage 21, the lubricating oil can act on the inclined baffle 5, so that the inclined baffle 5 can rotate with its hinge point below it as the rotation point, thereby allowing the impurities in the inclined baffle 5 to fall off.

[0038] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A crankshaft support structure for a scroll compressor, characterized in that, include: A crankshaft with internal oil passages; The support bearing is sleeved on the outside of the crankshaft and located below the crankshaft, with the bottom end face of the support bearing serving as the support end face; The bottom bearing is located at the bottom of the crankshaft. The upper end face of the bottom bearing is the abutment end face, and the support end face and the abutment end face abut against each other. The inner wall of the bottom bearing is provided with an annular oil groove along its circumference, and a number of vertical oil grooves connecting the annular oil groove and the lubrication cavity are provided in its axial direction. The support end face is provided with a number of end face oil grooves. The inner ring edge of the supporting end face is provided with a first chamfer structure, and the inner ring surface of the abutting end face is provided with a second chamfer structure. The first and second chamfer structures and the outer wall of the crankshaft cooperate to form a lubrication cavity. A first oil hole communicating with the lubrication cavity is provided through the oil passage side wall. The crankshaft has a mounting hole at the bottom end, and a second oil hole communicating with an annular oil groove is provided on the side wall of the mounting hole; The first oil hole is provided with an inclined baffle with downward angled filter holes at one end near the oil passage. A hinge plate is provided below the first oil hole and an elastic rod is provided above the first oil hole. The bottom of the inclined baffle is rotatably connected to the hinge plate and the top is connected to the elastic rod. A filter screen is installed at the end of the second oil hole near the crankshaft axis; the support bearing is interference-fitted with the crankshaft; The elastic rod includes a mounting sleeve and a sliding rod. The mounting sleeve is fixedly installed on the inner wall of the oil passage, and the sliding rod is fixedly connected to the inclined baffle. The sliding rod is slidably installed inside the mounting sleeve, and the mounting sleeve is provided with an abutment spring, which abuts against the end of the sliding rod.

2. The crankshaft support structure for a scroll compressor according to claim 1, characterized in that, Oil passages are provided inside the crankshaft along its axial direction.

3. The crankshaft support structure for a scroll compressor according to claim 2, characterized in that, The oil passage is eccentrically positioned, with the first oil hole located on the side of the oil passage sidewall away from the crankshaft axis.

4. The crankshaft support structure for a scroll compressor according to claim 1 or 2, characterized in that, The vertical oil groove connects the annular oil groove and the lubrication cavity; the bottom end of the crankshaft is provided with a mounting hole.

5. The crankshaft support structure for a scroll compressor according to any one of claims 1 to 3, characterized in that, The support end face has several radially arranged end face oil grooves in the circumferential direction.

6. The crankshaft support structure for a scroll compressor according to claim 1, characterized in that, The end face of the inclined barrier is set at an angle downwards.

7. The crankshaft support structure for a scroll compressor according to claim 6, characterized in that, The mounting hole is located at the bottom of the oil passage, and the diameter of the mounting hole is larger than the diameter of the oil passage.

8. The crankshaft support structure for a scroll compressor according to any one of claims 1 to 3, characterized in that, The bottom bearing has a mating hole at its center, the bottom of the crankshaft is located inside the mating hole, and an oil pump is installed inside the mating hole.

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