A design method for a rotating disk bottom plate of a scroll compressor

Abstract

The present invention relates to the field of compressor technology, and in particular to a design method for a movable plate bottom plate of a scroll compressor, comprising: determining the position of a drive center, determining the radius of the movable plate bottom plate, selecting a drive bearing model, determining a pin diameter and a ring thickness, determining a minimum thickness of the movable plate bottom plate, determining the position of an anti-rotation hole, determining the basic shape and position of the hole, adjusting the center of mass position, and determining the thickness of the movable plate bottom plate. The present invention provides a design method for a movable plate bottom plate of a scroll compressor, which solves the problem that the design of a movable plate bottom plate of a scroll compressor with a hole-pin anti-rotation structure is difficult to meet lightweight requirements, and can help realize miniaturization, high speed, lightweight, stable operation, and compliance with manufacturing process requirements of a scroll compressor.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a design method for a moving plate bottom plate of a scroll compressor. Background Art

[0002] The scroll compressor comprises a housing and a motor assembly, a fixed scroll, a movable scroll and a faceplate installed in the housing. The faceplate comprises a pin, the movable scroll comprises a movable disk bottom plate and a movable disk scroll tooth, and the movable disk bottom plate comprises a bottom plate annular hole, thereby forming a hole-pin anti-rotation structure.

[0003] The main functions of the movable scroll base are: 1. Support and transmit force to the scroll teeth; 2. Prevent self-rotation. In order to achieve the miniaturization and high speed requirements of the scroll compressor, the movable scroll base needs to be designed to be lightweight while meeting the two basic functions.

[0004] Therefore, those skilled in the art are committed to establishing a design method for a scroll disk bottom plate. In view of the above-mentioned defects, the present invention has made improvements. Summary of the invention

[0005] In order to overcome the shortcomings of the background technology, the present invention provides a design method for a scroll compressor moving plate bottom plate, which solves the problem that the design of a scroll compressor moving plate bottom plate with a hole pin anti-rotation structure is difficult to meet the lightweight requirements.

[0006] The technical solution adopted by the present invention is: a design method for a scroll compressor moving plate bottom plate, comprising the following steps:

[0007] 1) Determine the location of the drive center;

[0008] The plane where the connecting end surface of the moving disk scroll tooth is located is taken as the XY coordinate plane, and the coincidence of the base circle center of the moving disk scroll tooth and the base circle center of the static disk scroll tooth is taken as the design state. In the said design state, the base circle center of the static disk scroll tooth is set as O, and the radius of gyration is set as Ror. In the XY coordinate plane, a circle is drawn with point O as the center and 0.25Ror as the radius to enclose the first area, and a circle is drawn with the projection A of the centroid of the moving disk scroll tooth on the XY coordinate plane as the center and the OA connecting line as the radius to enclose the second area. A point is selected in the overlapping area of ​​the first area and the second area as the said driving center, and the driving center is the center of the said moving disk bottom plate;

[0009] 2) Determine the radius of the bottom plate of the moving plate;

[0010] The projection of the end point of the outer profile of the moving disk scroll tooth on the XY coordinate plane is set to B, the distance between the driving center and point B is set to d, and the radius of the moving disk bottom plate is set to r, which satisfies: r≥d, and in the XY coordinate plane, a circle drawn with the driving center as the center and r as the radius is the moving disk bottom plate circle;

[0011] 3) Select the driving bearing model according to the diameter size of the moving plate bottom plate, and obtain the outer radius and height of the driving bearing;

[0012] 4) Determine the pin diameter and ring thickness according to the structural strength requirements, and meet the following conditions: pin radius = ring inner radius - rotation radius, ring thickness = ring outer radius - ring inner radius;

[0013] 5) Determine the minimum thickness of the bottom plate of the moving plate according to the structural strength requirements, and use the bottom plate circle of the moving plate as a basic contour to stretch the minimum thickness to form an initial bottom plate;

[0014] 6) Determine the position of the anti-rotation hole;

[0015] Taking the driving center as the center, the radius of the circle where the center of the anti-rotation hole is located is determined as: the outer radius of the bearing + the minimum thickness of the bottom plate of the moving disk + the outer radius of the ring, and then the direction of the center of the first anti-rotation hole is determined according to the peak trend of the resultant force of the pin acting on the moving disk based on the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center, and then the position of the center of the first anti-rotation hole is determined, and the radius of the anti-rotation hole is equal to the outer radius of the ring. Finally, taking the driving center as the center, the first anti-rotation hole is arranged in a circular array to obtain the positions of multiple anti-rotation holes;

[0016] 7) Determine the basic shape and position of the hole;

[0017] Arrange digging holes between the anti-rotation holes on the bottom plate of the moving plate, the digging holes are used to adjust the position of the center of mass and reduce the mass of the bottom plate of the moving plate, first determine the basic shape and position of the first digging hole, and then arrange the first digging hole in a circular array with the driving center as the center to obtain the positions of multiple digging holes, and the number of the digging holes and the anti-rotation holes is the same;

[0018] 8) Adjust the center of mass position;

[0019] An initial hole with an initial depth is arranged between the anti-rotation holes on the bottom plate of the moving disk, and the center of mass position is adjusted by filling the hole filling entity in the initial hole and adjusting the height of the hole filling entity, and at the same time, the mass of all the hole filling entities is minimized to reduce the mass of the bottom plate of the moving disk. The center of mass position is adjusted to make the projection of the center of mass of the overall structure composed of the moving disk scroll gear and all the hole filling entities on the XY coordinate plane coincide with the driving center, and the height of each hole filling entity is solved according to the center of mass formula;

[0020] 9) Determine the thickness of the bottom plate of the moving plate;

[0021] Determine the depth of the driving bearing hole on the movable plate bottom plate, obtain the maximum height of the hole filling entity, and compare the height with the depth of the driving bearing hole. If the maximum height of the hole filling entity is ≥ the depth of the driving bearing hole, the thickness of the movable plate bottom plate is the maximum height of the hole filling entity + the minimum thickness of the movable plate bottom plate. If the maximum height of the hole filling entity is < the depth of the driving bearing hole, the thickness of the movable plate bottom plate is the depth of the driving bearing hole + the minimum thickness of the movable plate bottom plate. The initial depth of the initial hole is obtained by subtracting the minimum thickness of the movable plate bottom plate from the thickness of the movable plate bottom plate. On the basis of the initial bottom plate, the initial depth is stretched based on the movable plate bottom plate circle as the basic contour, and then stretched and cut to form the driving bearing hole, anti-rotation hole and hole.

[0022] Preferably, in the design state, the base circle center 0 of the static disk scroll tooth is used as the coordinate origin. When the intake is completed, the base circle center of the dynamic disk scroll tooth deviates from the base circle center of the static disk scroll tooth, and the direction of the ray pointing from the base circle center of the static disk scroll tooth to the base circle center of the dynamic disk scroll tooth is taken as the -Y axis direction, thereby determining the positive direction of the Y axis, and taking the positive direction of the Y axis as upward in the XY coordinate plane, determining the positive direction of the X axis to the right and establishing a right-handed rectangular coordinate system.

[0023] Preferably, the direction of rotation of the center of the base circle of the moving plate vortex tooth around the center of the base circle of the stationary plate vortex tooth is -Z axis direction according to the right-hand rule. In step 6), at the moment of completion of suction, according to the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center, the peak trend of the resultant force acting on the moving plate by the pin can be known that the line connecting the center of the first anti-rotation hole and the driving center is parallel to the X-axis, and the ray pointing from the driving center to the center of the first anti-rotation hole is along the positive direction of the X-axis, thereby determining the direction of the center of the first anti-rotation hole, and then combining with the circle where the center of the anti-rotation hole is located to determine the position of the center of the first anti-rotation hole.

[0024] Preferably, in step 1), a circle is drawn with the projection B of the end point of the outer profile of the moving disk scroll tooth on the XY coordinate plane as the center and the OB line as the radius to enclose the third area, and a point is selected in the overlapping area of ​​the first area, the second area and the third area as the driving center.

[0025] Preferably, in step 5), the minimum thickness of the bottom plate of the moving disk is preliminarily estimated by using the displacement constraint of the center point of the disk under the gradual load, specifically: Among them, y c is the displacement of the center point of the disk, E is the elastic modulus of the moving disk, γ is the Poisson's ratio of the material, q is the load, t is the thickness of the moving disk bottom plate, a is the radius of the moving disk bottom plate, and by making y c ≤1mm to estimate the minimum thickness of the moving plate bottom plate.

[0026] Preferably, in step 7), an anti-rotation hole adjacent to the first anti-rotation hole is selected as the second anti-rotation hole, and the radii of the circles where the driving bearing hole, the first anti-rotation hole, and the second anti-rotation hole are located are respectively expanded by the minimum thickness of the moving disk bottom plate to obtain the first circle, the second circle, and the third circle. With the driving center as the center of the circle, the outer radius of the bearing + the minimum thickness of the moving disk bottom plate + the outer diameter of the ring is used as the radius to form a fourth circle. The first circle, the second circle, the third circle, and the fourth circle are rounded to obtain the basic shape and position of the first hole.

[0027] Preferably, in step 8), in order to minimize the mass of all hole-filling entities, the centroid of the moving disk scroll tooth and the centroid of the hole are projected onto the XY coordinate plane, the projection point of the centroid of the moving disk scroll tooth and the driving center are connected, a perpendicular line is drawn through the driving center to determine all the holes on the side of the perpendicular away from the projection point of the centroid of the moving disk scroll tooth and the vertical line, and the hole-filling entities are filled in these holes, so that the projection of the centroid of the overall structure composed of the moving disk scroll tooth and all the hole-filling entities on the XY coordinate plane coincides with the driving center, and the height of the hole-filling entity is obtained.

[0028] Preferably, in step 6), the first anti-rotation hole circular array is divided into 6 anti-rotation holes with the driving center as the center, and in step 7), the first digging hole circular array is divided into 6 digging holes with the driving center as the center.

[0029] Preferably, in step 9), the depth of the driving bearing hole on the movable plate bottom plate is ≥ 2 / 3 of the driving bearing height, the depth of the driving bearing hole is taken as 2 / 3 of the driving bearing height, and the maximum height of the hole filling entity is compared with 2 / 3 of the driving bearing height. If the maximum height of the hole filling entity is ≥ 2 / 3 of the driving bearing height, the thickness of the movable plate bottom plate is the maximum height of the hole filling entity + the minimum thickness of the movable plate bottom plate. If the maximum height of the hole filling entity is < 2 / 3 of the driving bearing height, the thickness of the movable plate bottom plate is 2 / 3 of the driving bearing height + the minimum thickness of the movable plate bottom plate.

[0030] Preferably, after step 9), it also includes: adding an annular wear-resistant protrusion to the outer periphery of one side of the movable plate bottom plate away from the movable plate vortex tooth, the height of the wear-resistant protrusion is 0.2-0.5mm, the inner circle of the wear-resistant protrusion is close to the anti-rotation hole, and the outer circle of the wear-resistant protrusion is the outer circle of the movable plate bottom plate.

[0031] In summary, the beneficial effects of the present invention are:

[0032] The movable plate bottom plate of the present invention can effectively reduce the bottom plate diameter, thereby reducing the mass of the movable plate bottom plate and the size of the whole machine; the reasonable arrangement of the holes not only reduces the mass of the movable plate bottom plate, but also can adjust the projection of the center of mass of the movable scroll on the XY coordinate plane to coincide with the driving center, thereby reducing the additional torque generated by the centrifugal force on the driving center; the arrangement of the anti-rotation holes on the movable plate bottom plate reduces the peak value borne by the anti-rotation holes; the design method of the present invention can help realize the miniaturization, high speed, lightweight, smooth operation of the scroll compressor, and meet the requirements of the manufacturing process.

[0033] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 A schematic diagram of the dynamic and static disk of the present invention in a design state;

[0036] Figure 2 A schematic diagram defining a right-hand rectangular coordinate system for the present invention;

[0037] Figure 3 A trend diagram of the azimuth angle of the anti-rotation hole and the maximum value of the resultant force of the pin acting on the moving plate of the present invention;

[0038] Figure 4 A profile diagram of a moving disk scroll tooth of the present invention;

[0039] Figure 5 A schematic diagram of the present invention for determining a driving center;

[0040] Figure 6 A plan view of the anti-rotation hole of the present invention;

[0041] Figure 7 A plan view for determining the basic shape of a hole to be dug according to the present invention;

[0042] Figure 8 A plan view of a hole dug for the present invention;

[0043] Fig. 9 A schematic diagram of the position of the wear-resistant protrusion of the present invention;

[0044] Fig.10 A schematic diagram of the rounded corners of a hole dug in the present invention;

[0045] Fig.11 A schematic diagram of the structure of the movable plate bottom plate and the movable plate scroll gear of the present invention; DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention Figures 1 to 11 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0047] In order to make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solution in the embodiment of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiment of the present invention.

[0048] The present invention provides a design method for a scroll compressor moving plate bottom plate with a hole pin anti-rotation structure, which solves the problem that the design of the scroll compressor moving plate bottom plate is difficult to meet the lightweight requirements. The method will help realize the miniaturization, high speed, lightweight, stable operation of the scroll compressor and meet the requirements of the manufacturing process.

[0049] like Figures 1 to 11 As shown, the present embodiment discloses a method for designing a scroll compressor moving plate bottom plate, comprising the following steps:

[0050] 1) Determine the location of the drive center;

[0051] The plane where the connecting end surface of the moving disk scroll tooth is located is taken as the XY coordinate plane, and the coincidence of the base circle center of the moving disk scroll tooth and the base circle center of the static disk scroll tooth is taken as the design state. In the said design state, the base circle center of the static disk scroll tooth is set as O, and the radius of gyration is set as Ror. In the XY coordinate plane, a circle is drawn with point O as the center and 0.25Ror as the radius to enclose the first area, and a circle is drawn with the projection A of the centroid of the moving disk scroll tooth on the XY coordinate plane as the center and the OA connecting line as the radius to enclose the second area. A point is selected in the overlapping area of ​​the first area and the second area as the said driving center, and the driving center is the center of the said moving disk bottom plate;

[0052] To prevent the rotation torque from changing direction during rotation, the drive center must be within a circle with point O (the center of the base circle of the moving disk scroll tooth is point O when in the design state) as the center and a radius of 0.5 times the rotation radius. The farther the drive center is from the center of the base circle of the moving disk scroll tooth, the greater the fluctuation of the rotation torque. Generally, it is best to take it within 0.25 times the rotation radius, thereby determining the first area. At the same time, the position of the drive center should be close to the projection A of the center of mass of the moving disk scroll tooth on the XY coordinate plane, thereby determining the second area. The area where the first area and the second area intersect and overlap constitutes the selection area of ​​the drive center.

[0053] Preferably, in step 1), a circle is drawn to enclose the third area with the projection B of the end point of the outer profile of the moving disk scroll tooth on the XY coordinate plane as the center and the OB connecting line as the radius, and a point is selected as the driving center in the overlapping area of ​​the first area, the second area and the third area. The position of the driving center should also be close to the projection B of the end point of the outer profile of the moving disk scroll tooth on the XY coordinate plane, and thus the third area is determined, which can further narrow the selection range of the driving center, and finally a point is selected as the driving center in the overlapping area of ​​the first area, the second area and the third area, which can well meet the design requirements.

[0054] Preferably, a right-hand rectangular coordinate system is established in the following manner: in the design state, the center O of the base circle of the vortex teeth of the static disk is used as the origin of the coordinates; at the moment when the air intake is completed, the center of the base circle of the vortex teeth of the dynamic disk deviates from the center of the base circle of the vortex teeth of the static disk, and the direction of the ray pointing from the center of the base circle of the vortex teeth of the static disk to the center of the base circle of the vortex teeth of the dynamic disk is the -Y axis direction, thereby determining the positive direction of the Y axis, and in the XY coordinate plane, the positive direction of the Y axis is upward, and the positive direction of the X axis is determined to the right and a right-hand rectangular coordinate system is established. By establishing a coordinate system, it is easy to locate various key points and quantitative calculations, which can facilitate a better design of the dynamic disk bottom plate.

[0055] 2) Determine the radius of the bottom plate of the moving plate;

[0056] The projection of the end point of the outer profile of the moving disk scroll tooth on the XY coordinate plane is set to B, the distance between the driving center and point B is set to d, and the radius of the moving disk bottom plate is set to r, which satisfies: r≥d, and in the XY coordinate plane, a circle drawn with the driving center as the center and r as the radius is the moving disk bottom plate circle;

[0057] In step 2), since the movable plate bottom plate needs to be light in weight, the radius of the movable plate bottom plate should be as small as possible, and r is preferably determined by rounding d upward.

[0058] 3) Select the driving bearing model according to the diameter size of the moving plate bottom plate, and obtain the outer radius and height of the driving bearing;

[0059] Preferably, the outer diameter of the driving bearing is approximately half of the diameter of the moving plate bottom plate, thereby determining the model of the driving bearing and obtaining the outer radius and height of the driving bearing.

[0060] 4) Determine the pin diameter and ring thickness according to the structural strength requirements, and meet the following conditions: pin radius = ring inner radius - rotation radius, ring thickness = ring outer radius - ring inner radius;

[0061] In step 4), the specific pin diameter and ring thickness need to be determined for the specific implementation case and based on the structural strength requirements, and then the various dimensions can be obtained based on the dimensional constraints that need to be met.

[0062] 5) Determine the minimum thickness of the bottom plate of the moving plate according to the structural strength requirements, and use the bottom plate circle of the moving plate as a basic contour to stretch the minimum thickness to form an initial bottom plate;

[0063] In step 5), when determining the minimum thickness of the bottom plate of the moving disk according to the structural strength requirements, it is preferred to use the displacement constraint of the center point of the disk under the gradual load to preliminarily estimate the minimum thickness of the bottom plate of the moving disk, specifically: Among them, y c is the displacement of the center point of the disk, E is the elastic modulus of the moving disk,

[0064] γ is the Poisson's ratio of the material, q is the load, t is the thickness of the bottom plate of the moving plate, a is the radius of the bottom plate of the moving plate, and by making y c ≤1mm to estimate the minimum thickness of the moving plate bottom plate.

[0065] 6) Determine the position of the anti-rotation hole;

[0066] Taking the driving center as the center, the radius of the circle where the center of the anti-rotation hole is located is determined as: the outer radius of the bearing + the minimum thickness of the bottom plate of the moving disk + the outer radius of the ring, and then the direction of the center of the first anti-rotation hole is determined according to the peak trend of the resultant force of the pin acting on the moving disk based on the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center, and then the position of the center of the first anti-rotation hole is determined, and the radius of the anti-rotation hole is equal to the outer radius of the ring. Finally, taking the driving center as the center, the first anti-rotation hole is arranged in a circular array to obtain the positions of multiple anti-rotation holes;

[0067] Preferably, in the established right-hand rectangular coordinate system, the rotation direction of the base circle center of the moving disk scroll tooth around the base circle center of the stationary disk scroll tooth is -Z axis direction according to the right-hand rule, and the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center has the following effect on the peak value trend of the resultant force acting on the moving disk by the pin: Figure 3In the figure, the horizontal axis represents the azimuth angle, and the vertical axis represents the resultant force. At the moment of inhalation completion, according to the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center, the peak trend of the resultant force of the pin acting on the moving disk shows that the line connecting the center of the first anti-rotation hole and the driving center is parallel to the X-axis, and the ray from the driving center to the center of the first anti-rotation hole is along the positive direction of the X-axis, thereby determining the direction of the center of the first anti-rotation hole, and then combining the circle where the center of the anti-rotation hole is located to determine the position of the center of the first anti-rotation hole, and then determining the position of the first anti-rotation hole, and then through the circular array, the other anti-rotation holes can be obtained.

[0068] 7) Determine the basic shape and position of the hole;

[0069] Arrange digging holes between the anti-rotation holes on the bottom plate of the moving plate, the digging holes are used to adjust the position of the center of mass and reduce the mass of the bottom plate of the moving plate, first determine the basic shape and position of the first digging hole, and then arrange the first digging hole in a circular array with the driving center as the center to obtain the positions of multiple digging holes, and the number of the digging holes and the anti-rotation holes is the same;

[0070] Preferably, an anti-rotation hole adjacent to the first anti-rotation hole is selected as the second anti-rotation hole, and the radii of the circles where the driving bearing hole, the first anti-rotation hole, and the second anti-rotation hole are located are respectively enlarged by the minimum thickness size of the movable plate bottom plate to obtain the first circle, the second circle, and the third circle. With the driving center as the center of the circle, the outer radius of the bearing + the minimum thickness of the movable plate bottom plate + the outer diameter of the ring are used as the radius to form a fourth circle. The first circle, the second circle, the third circle, and the fourth circle are rounded to obtain the basic shape and position of the first hole. Among them, the driving bearing hole is used to install the driving bearing, and the radius of the driving bearing hole is equal to the outer radius of the driving bearing.

[0071] The number of the digging holes and the anti-rotation holes is the same. Preferably, in step 6), the first anti-rotation hole circular array is divided into 6 anti-rotation holes with the driving center as the center, and in step 7), the first digging hole circular array is divided into 6 digging holes with the driving center as the center.

[0072] Preferably, all the holes have the same fillet size which is conducive to casting.

[0073] 8) Adjust the center of mass position;

[0074] An initial hole with an initial depth is arranged between the anti-rotation holes on the bottom plate of the moving disk, and the center of mass position is adjusted by filling the hole filling entity in the initial hole and adjusting the height of the hole filling entity, and at the same time, the mass of all the hole filling entities is minimized to reduce the mass of the bottom plate of the moving disk. The center of mass position is adjusted to make the projection of the center of mass of the overall structure composed of the moving disk scroll gear and all the hole filling entities on the XY coordinate plane coincide with the driving center, and the height of each hole filling entity is solved according to the center of mass formula;

[0075] Preferably, in order to minimize the mass of all hole-filling entities, the centroid of the moving disk scroll tooth and the centroid of the hole are projected onto the XY coordinate plane, the projection point of the centroid of the moving disk scroll tooth and the driving center are connected, a perpendicular line is drawn through the driving center to determine all the holes on the side of the perpendicular away from the projection point of the centroid of the moving disk scroll tooth and the hole-filling entities are filled in these holes, so that the projection of the centroid of the overall structure composed of the moving disk scroll tooth and all the hole-filling entities on the XY coordinate plane coincides with the driving center, and the height of the hole-filling entity is obtained. Among them, the projection point of the centroid of the moving disk scroll tooth is located on one side of the perpendicular line, and the holes that need to be filled with the hole-filling entities are located on the other side of the perpendicular line. Using this method to determine which holes need to be filled with the hole-filling entities can most effectively adjust the center of mass position. By determining which holes are filled with the hole-filling entities and determining the height of the hole-filling entities, the center of mass position can be well adjusted to meet the design requirements. The essence of adjusting the center of mass position is to adjust the projection of the center of mass of the movable scroll in the XY plane to coincide with the driving center, wherein the movable scroll includes a movable scroll swirl tooth and a movable scroll bottom plate.

[0076] 9) Determine the thickness of the bottom plate of the moving plate;

[0077] Determine the depth of the driving bearing hole on the movable plate bottom plate, obtain the maximum height of the hole filling entity, and compare the height with the depth of the driving bearing hole. If the maximum height of the hole filling entity is ≥ the depth of the driving bearing hole, the thickness of the movable plate bottom plate is the maximum height of the hole filling entity + the minimum thickness of the movable plate bottom plate. If the maximum height of the hole filling entity is < the depth of the driving bearing hole, the thickness of the movable plate bottom plate is the depth of the driving bearing hole + the minimum thickness of the movable plate bottom plate. The initial depth of the initial hole is obtained by subtracting the minimum thickness of the movable plate bottom plate from the thickness of the movable plate bottom plate. On the basis of the initial bottom plate, the initial depth is stretched based on the movable plate bottom plate circle as the basic contour, and then stretched and cut to form the driving bearing hole, anti-rotation hole and hole.

[0078] In order to stably transmit the force on the driving bearing to the moving plate, the depth of the driving bearing hole must be at least 2 / 3 of the bearing height, that is, the depth of the driving bearing hole on the moving plate bottom plate ≥ 2 / 3 of the driving bearing height. In this embodiment, the depth of the driving bearing hole is taken as 2 / 3 of the driving bearing height, and then the maximum height of the hole-filling entity is compared with 2 / 3 of the driving bearing height. If the maximum height of the hole-filling entity is ≥ 2 / 3 of the driving bearing height, the thickness of the moving plate bottom plate is the maximum height of the hole-filling entity + the minimum thickness of the moving plate bottom plate. If the maximum height of the hole-filling entity is < 2 / 3 of the driving bearing height, the thickness of the moving plate bottom plate is 2 / 3 of the driving bearing height + the minimum thickness of the moving plate bottom plate. Preferably, the depth of the anti-rotation hole is the same as the initial depth of the initial hole.

[0079] The radial thickness of the moving disc bottom plate must at least retain the minimum thickness of the moving disc bottom plate, that is, the drive bearing hole, anti-rotation hole and digging hole on the bottom surface of the moving disc bottom plate cannot exceed the part of the moving disc bottom plate determined by the minimum thickness of the moving disc bottom plate, so as to ensure the structural strength of the moving disc bottom plate. The drive bearing hole is used to install the drive bearing on the moving disc bottom plate, and the digging hole filling entity is used to fill the digging hole. The digging hole filling entity cannot protrude from the bottom surface of the moving disc bottom plate, so as to determine the thickness of the moving disc bottom plate that needs to be increased based on the minimum thickness.

[0080] Preferably, after step 9), it also includes: adding an annular wear-resistant protrusion to the outer periphery of one side of the movable plate bottom plate away from the movable plate vortex tooth, the height of the wear-resistant protrusion is 0.2-0.5mm, the inner circle of the wear-resistant protrusion is close to the anti-rotation hole, and the outer circle of the wear-resistant protrusion is the outer circle of the movable plate bottom plate.

[0081] This embodiment discloses a design method for a bottom plate of a dynamic disk of a scroll compressor. The following example specifically illustrates the application of the design method.

[0082] 1) Determine the location of the drive center.

[0083] The rotating disk scroll tooth has a radius of rotation Ror of 4.8 mm and a volume of 17823 mm^3. Figure 4 As shown, this is a profile of a moving disk scroll tooth Figure 1 , establish a right-hand rectangular coordinate system using the above method. In the XY coordinate plane, the origin is O, the projection B coordinate of the end point of the outer profile of the rotating disk scroll tooth on the XY coordinate plane is (-2.172, 39.947) mm, and the projection A coordinate of the center of mass of the rotating disk scroll tooth on the XY coordinate plane is (3.654, 0.449) mm. Figure 5 As shown, Figure 5 It is a local schematic diagram. Circle 4 encloses the first area, circle 3 encloses the second area, and circle 2 encloses the third area. The overlapping area of ​​circles 2, 3, and 4 is the best location for selecting the drive center. In this embodiment, the coordinates of the drive center position are (1.11, 0.45) mm.

[0084] 2) Determine the radius of the bottom plate of the moving plate;

[0085] In the XY coordinate plane, the distance d between the drive center and point B is 39.63mm, the radius r of the movable plate bottom plate is ≥ 39.63mm, rounded upwards, taking the radius as 40mm, and drawing a movable plate bottom plate circle with the drive center as the center and a radius of 40mm.

[0086] 3) Select the driving bearing model according to the diameter size of the moving plate bottom plate, and obtain the outer radius and height of the driving bearing;

[0087] The driving bearing selected in this embodiment has an outer radius of 18.5 mm and a height of 10 mm.

[0088] 4) Determine the pin diameter and ring thickness based on structural strength requirements;

[0089] In this embodiment, the pin radius is selected to be 2 mm and the ring thickness is selected to be 0.9 mm, so the inner radius of the ring is 4.8+2=6.8 mm and the outer radius is 6.8+0.9=7.7 mm.

[0090] 5) Determine the minimum thickness of the moving plate base plate according to the structural strength requirements;

[0091] According to the above estimation method, by making y c ≤1mm to estimate the minimum thickness of the bottom plate of the moving disk, and obtain t≥2.45mm, that is, the minimum thickness of the bottom plate of the moving disk is 2.45mm. The initial bottom plate is formed by stretching the bottom plate circle of the moving disk as the basic contour by 2.45mm.

[0092] 6) Determine the position of the anti-rotation hole;

[0093] like Figure 6 As shown, circle 5 represents the first anti-rotation hole, the line connecting its center and the driving center is parallel to the X-axis, the distance from the center of the first anti-rotation hole to the driving center is 28.65mm (i.e., the outer radius of the bearing + the minimum thickness of the bottom plate of the moving plate + the outer radius of the ring), the coordinates of the center of the first anti-rotation hole are (29.76, 0.45) mm, and the radius of the first anti-rotation hole is 7.7mm (i.e., equal to the outer radius of the ring). With the driving center as the center, the first anti-rotation holes are arranged in a circular array to obtain 6 anti-rotation holes.

[0094] 7) Determine the basic shape and position of the hole;

[0095] like Figure 7As shown, the radii of the circles where the driving bearing hole, the first anti-rotation hole and the second anti-rotation hole are located are respectively enlarged by the minimum thickness dimension of the moving plate bottom plate by 2.45 mm to obtain the first circle, the second circle and the third circle. The fourth circle is formed with the driving center as the center and 36.35 mm (i.e., the outer radius of the bearing + the minimum thickness of the moving plate bottom plate + the outer diameter of the ring) as the radius. In the figure, circle 7 is the first circle, circle 6 is the second circle, circle 8 is the fourth circle, and circle 9 is the third circle. The corners between circles 6, 7, 8 and 9 are rounded with a rounded diameter of 5 mm, and the basic shape and position of the first hole are obtained, as shown in FIG. Figure 8 The coordinates of the centroid of the first hole are (26.75, 15.25) mm, and the area is 163.64 mm^2. With the driving center as the center, the first hole is arranged in a circular array to obtain 6 holes, which are marked as hole 10, hole 11, hole 12, hole 13, hole 14 and hole 16 respectively.

[0096] 8) Adjust the center of mass position;

[0097] The position of the mass center is adjusted by distributing the height of the hole filling entity. The height of the hole filling entity can be understood as the stretched height of the hole section in the initial hole on the bottom plate of the movable plate, that is, the hole filling entity on the bottom plate of the movable plate is to be retained. The initial depth of the initial hole minus the height of the hole filling entity filled into the hole can be obtained to obtain the depth of the hole that needs to be stretched and removed from the bottom surface of the bottom plate of the movable plate. In order to minimize the mass of all hole filling entities, such as Figure 8 As shown, the coordinates (x, y) of the centroid projection point of each hole are recorded. The holes on the side of the vertical line away from the centroid projection point of the moving disk scroll tooth are determined as holes 12 and 13. Holes 12 and 13 are farthest from the centroid of the moving scroll tooth. It is most effective to adjust the centroid of the moving scroll by filling holes 12 and 13 with hole filling entities and adjusting the height of the hole filling entities. The coordinates of the centroid projection point of hole 12 are (-26.45, 16.36) mm, and the coordinates of the centroid projection point of hole 13 are (-26.45, -15.46) mm. The areas of holes 12 and 13 are both 163.64 mm^2. The projection of the center of mass of the whole structure composed of the rotating disk scroll tooth and the hole filling entity in the holes 12 and 13 on the XY coordinate plane coincides with the driving center, wherein the volume of the rotating disk scroll tooth is 17823 mm^3, and the projection A coordinate of the center of mass of the rotating disk scroll tooth on the XY coordinate plane is (3.654, 0.449) mm. The center of mass formula is used to solve the height of the hole filling entity, which is as follows:

[0098]

[0099] A 12 is the cross-sectional area of ​​the hole filling entity filled in the hole 12, that is, the area of ​​the hole 12, h12 is the height of the filling entity in hole 12, x 12 is the x-coordinate of the projection point of the centroid of hole 12,

[0100] y 12 is the y-coordinate of the projection point of the centroid of the hole 12.

[0101] A 13 is the cross-sectional area of ​​the hole filling entity filled in the hole 13, that is, the area of ​​the hole 13, h 13 is the height of the filling entity in hole 13, x 13 is the x-coordinate of the projection point of the centroid of hole 13, and y 13 is the y-coordinate of the projection point of the centroid of the hole 13.

[0102] V0 is the volume of the rotating disk scroll, x0 is the x-coordinate of point A, and y0 is the y-coordinate of point A. c is the x-coordinate of the driving center, y c is the y-coordinate of the driving center.

[0103] Solving the above equations, we can obtain that the height of the hole filling entity in hole 12 is 5.41 mm, the height of the hole filling entity in hole 13 is 5.40 mm, and the height of the hole filling entities in other holes is 0 mm, which means that other holes do not need to be filled with hole filling entities.

[0104] 9) Determine the thickness of the bottom plate of the moving plate;

[0105] In this embodiment, the driving bearing height is 10 mm, and 2 / 3 of the driving bearing height is 6.67 mm, which is greater than the maximum height of the hole filling entity calculated in the previous step. Therefore, the thickness of the moving disk bottom plate in this embodiment is 9.12 mm (i.e. 2 / 3 of the driving bearing height + the minimum thickness of the moving disk bottom plate).

[0106] On the basis of the initial bottom plate thickness of 2.45mm, a further stretching of 6.67mm is performed to form a 9.12mm thick moving plate bottom plate, and various holes are formed by stretching and cutting from the bottom surface of the driven plate bottom plate. Specifically, in order to facilitate the understanding of the design process, the present embodiment is designed in a way of first digging and then filling. A 6.67mm drive bearing hole is formed by stretching and cutting at the determined driving bearing hole position, and an anti-rotation hole is formed by stretching and cutting at the determined 6 anti-rotation hole positions. An initial digging hole with an initial depth is formed by stretching and cutting at the determined hole digging position, that is, the initial depth is 6.67mm, so that the depth of the initial digging hole just touches the initial bottom plate. In the digging hole 12, a hole 12 is used as a basic contour on the initial bottom plate and pulled up to a height of 5.41mm to form a hole filling entity. In the digging hole 13, a hole 13 is used as a basic contour on the initial bottom plate and stretched up to a height of 5.40mm to form a hole filling entity. In this way, the center of mass position can be adjusted so that the projection of the center of mass of the movable scroll in the XY plane coincides with the driving center. The purpose of constructing the hole filling entity in this embodiment is to facilitate the understanding of the adjustment of the center of mass position. The specific design is not limited to the above-mentioned method of first digging and then filling. For holes 12 and 13, the depth of the stretching and cutting can be directly changed, that is, the height of the hole filling entity to be filled is subtracted from the initial depth to obtain the depth required for stretching and cutting.

[0107] 10)Detailed design;

[0108] In this embodiment, the height of the wear-resistant protrusion is 0.3 mm, and the inner radius of the wear-resistant protrusion is 37.5 mm. Fig. 9 As shown in area 17. After the wear-resistant protrusions are added, the actual thickness of the movable plate bottom plate needs to be based on the movable plate bottom plate thickness calculated in step 9) plus the height of the wear-resistant protrusions.

[0109] like Fig.10 As shown, all the holes on the bottom plate of the moving disc adopt the same fillet size that is conducive to casting. Preferably, the fillet size of the end face close to the wear-resistant protrusion is 2 mm, and the fillet size of the other end face is 1 mm.

[0110] Fig.11 It is a three-dimensional schematic diagram of a movable scroll, which includes a movable scroll bottom plate 22 and a movable scroll tooth 21. The movable scroll bottom plate 22 is provided with a driving bearing hole 23, an anti-rotation hole 24, a hole 25 and a wear-resistant protrusion 26. When designing specifically, the movable scroll tooth is designed first, and then the movable scroll bottom plate is designed. The design of the movable scroll tooth can refer to the existing technology.

[0111] In this embodiment, the centroid coordinates, area and other data can be read from CAD software, which belongs to the prior art and will not be further explained here.

[0112] Parts not involved in this embodiment are the same as the prior art or can be implemented by using the prior art, and will not be further described here.

[0113] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent right.

Claims

1. A design method for a scroll compressor moving plate bottom plate, characterized in that: The following steps are involved: 1) Determine the location of the drive center; The plane where the connecting end surface of the moving disk scroll tooth is located is taken as the XY coordinate plane, and the coincidence of the base circle center of the moving disk scroll tooth and the base circle center of the static disk scroll tooth is taken as the design state. In the said design state, the base circle center of the static disk scroll tooth is set as O, and the radius of gyration is set as Ror. In the XY coordinate plane, a circle is drawn with point O as the center and 0.25Ror as the radius to enclose the first area, and a circle is drawn with the projection A of the centroid of the moving disk scroll tooth on the XY coordinate plane as the center and the OA connecting line as the radius to enclose the second area. A point is selected in the overlapping area of ​​the first area and the second area as the said driving center, and the driving center is the center of the said moving disk bottom plate; 2) Determine the radius of the bottom plate of the moving plate; The projection of the end point of the outer profile of the rotating disk scroll tooth on the XY coordinate plane is set to B, the distance between the driving center and point B is set to d, the radius of the rotating disk bottom plate is set to r, d is rounded upward to determine r, and in the XY coordinate plane, a circle drawn with the driving center as the center and r as the radius is the rotating disk bottom plate circle; 3) Select the driving bearing model according to the diameter size of the moving plate bottom plate, and obtain the outer radius and height of the driving bearing; 4) Determine the pin diameter and ring thickness according to the structural strength requirements, and meet the following conditions: pin radius = ring inner radius - rotation radius, ring thickness = ring outer radius - ring inner radius; 5) Determine the minimum thickness of the bottom plate of the moving plate according to the structural strength requirements, and use the bottom plate circle of the moving plate as a basic contour to stretch the minimum thickness to form an initial bottom plate; 6) Determine the position of the anti-rotation hole; Taking the driving center as the center, the radius of the circle where the center of the anti-rotation hole is located is determined as: the outer radius of the bearing + the minimum thickness of the bottom plate of the moving disk + the outer radius of the ring, and then the direction of the center of the first anti-rotation hole is determined according to the peak trend of the resultant force of the pin acting on the moving disk based on the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center, and then the position of the center of the first anti-rotation hole is determined, and the radius of the anti-rotation hole is equal to the outer radius of the ring. Finally, taking the driving center as the center, the first anti-rotation hole is arranged in a circular array to obtain the positions of multiple anti-rotation holes; 7) Determine the basic shape and position of the hole; Arrange digging holes between the anti-rotation holes on the bottom plate of the moving plate, the digging holes are used to adjust the position of the center of mass and reduce the mass of the bottom plate of the moving plate, first determine the basic shape and position of the first digging hole, and then arrange the first digging hole in a circular array with the driving center as the center to obtain the positions of multiple digging holes, and the number of the digging holes and the anti-rotation holes is the same; 8) Adjust the center of mass position; An initial hole with an initial depth is arranged between the anti-rotation holes on the bottom plate of the moving disk, and the center of mass position is adjusted by filling the hole filling entity in the initial hole and adjusting the height of the hole filling entity, and at the same time, the mass of all the hole filling entities is minimized to reduce the mass of the bottom plate of the moving disk. The center of mass position is adjusted to make the projection of the center of mass of the overall structure composed of the moving disk scroll gear and all the hole filling entities on the XY coordinate plane coincide with the driving center, and the height of each hole filling entity is solved according to the center of mass formula; 9) Determine the thickness of the bottom plate of the moving plate; Determine the depth of the driving bearing hole on the movable plate bottom plate, obtain the maximum height of the hole filling entity, and compare the height with the depth of the driving bearing hole. If the maximum height of the hole filling entity is ≥ the depth of the driving bearing hole, the thickness of the movable plate bottom plate is the maximum height of the hole filling entity + the minimum thickness of the movable plate bottom plate. If the maximum height of the hole filling entity is < the depth of the driving bearing hole, the thickness of the movable plate bottom plate is the depth of the driving bearing hole + the minimum thickness of the movable plate bottom plate. The initial depth of the initial hole is obtained by subtracting the minimum thickness of the movable plate bottom plate from the thickness of the movable plate bottom plate. On the basis of the initial bottom plate, the initial depth is stretched based on the movable plate bottom plate circle as the basic contour, and then stretched and cut to form the driving bearing hole, anti-rotation hole and hole.

2. The design method of a scroll compressor moving plate bottom plate according to claim 1, characterized in that: In the design state, the center O of the base circle of the static disk scroll tooth is used as the coordinate origin. When the suction is completed, the center of the base circle of the dynamic disk scroll tooth deviates from the center of the base circle of the static disk scroll tooth. The direction of the ray pointing from the center of the base circle of the static disk scroll tooth to the center of the base circle of the dynamic disk scroll tooth is taken as the -Y axis direction, thereby determining the positive direction of the Y axis. In the XY coordinate plane, the positive direction of the Y axis is taken as upward, the positive direction of the X axis is determined to the right, and a right-handed rectangular coordinate system is established.

3. The design method of a scroll compressor moving plate bottom plate according to claim 2, characterized in that: The direction of rotation of the center of the base circle of the moving plate scroll tooth around the center of the base circle of the stationary plate scroll tooth is -Z axis direction according to the right-hand rule. In step 6), at the moment of completion of suction, according to the azimuth angle of the line connecting the center of the anti-rotation hole and the driving center, the peak trend of the resultant force acting on the moving plate by the pin can be known that the line connecting the center of the first anti-rotation hole and the driving center is parallel to the X-axis, and the ray pointing from the driving center to the center of the first anti-rotation hole is along the positive direction of the X-axis, thereby determining the direction of the center of the first anti-rotation hole, and then combining with the circle where the center of the anti-rotation hole is located to determine the position of the center of the first anti-rotation hole.

4. The design method of a scroll compressor moving plate bottom plate according to claim 1, characterized in that: In step 1), a circle is drawn with the projection B of the end point of the outer profile of the moving disk scroll tooth on the XY coordinate plane as the center and the OB line as the radius to enclose the third area, and a point is selected in the overlapping area of ​​the first area, the second area and the third area as the driving center.

5. The design method of a scroll compressor moving plate bottom plate according to claim 1, characterized in that: In step 5), the minimum thickness of the bottom plate of the moving disk is preliminarily estimated by using the displacement constraint of the center point of the disk under the gradual load, specifically: Among them, y c is the displacement of the center point of the disk, E is the elastic modulus of the moving disk, γ is the Poisson's ratio of the material, q is the load, t is the thickness of the bottom plate of the moving plate, a is the radius of the bottom plate of the moving plate, and by making y c ≤1mm to estimate the minimum thickness of the moving plate bottom plate.

6. The design method of a scroll compressor moving plate bottom plate according to claim 1, characterized in that: In step 7), an anti-rotation hole adjacent to the first anti-rotation hole is selected as the second anti-rotation hole, and the radii of the circles where the driving bearing hole, the first anti-rotation hole, and the second anti-rotation hole are located are respectively expanded by the minimum thickness of the moving disk bottom plate to obtain the first circle, the second circle, and the third circle. With the driving center as the center of the circle, the outer radius of the bearing + the minimum thickness of the moving disk bottom plate + the outer diameter of the ring is used as the radius to form a fourth circle. The first circle, the second circle, the third circle, and the fourth circle are rounded to obtain the basic shape and position of the first hole.

7. The design method of a scroll compressor moving plate bottom plate according to claim 1, characterized in that: In step 8), in order to minimize the mass of all hole-filling entities, the centroid of the moving disk scroll tooth and the centroid of the hole are projected onto the XY coordinate plane, the projection point of the centroid of the moving disk scroll tooth and the driving center are connected, a perpendicular line is drawn through the driving center to determine all the holes on the side of the perpendicular line away from the projection point of the centroid of the moving disk scroll tooth and the hole-filling entity, and the projection of the centroid of the hole on the XY coordinate plane of the overall structure composed of the moving disk scroll tooth and all the hole-filling entities coincides with the driving center, and the height of the hole-filling entity is obtained.

8. The method for designing a scroll compressor rotor bottom plate according to claim 1, characterized in that: In step 6), the first anti-rotation hole circular array is divided into 6 anti-rotation holes with the driving center as the center. In step 7), the first digging hole circular array is divided into 6 digging holes with the driving center as the center.

9. The method for designing a scroll compressor rotor bottom plate according to claim 1, characterized in that: In step 9), the depth of the driving bearing hole on the movable plate bottom plate is ≥ 2 / 3 of the driving bearing height, the depth of the driving bearing hole is taken as 2 / 3 of the driving bearing height, and the maximum height of the hole filling entity is compared with 2 / 3 of the driving bearing height. If the maximum height of the hole filling entity is ≥ 2 / 3 of the driving bearing height, the thickness of the movable plate bottom plate is the maximum height of the hole filling entity + the minimum thickness of the movable plate bottom plate. If the maximum height of the hole filling entity is < 2 / 3 of the driving bearing height, the thickness of the movable plate bottom plate is 2 / 3 of the driving bearing height + the minimum thickness of the movable plate bottom plate.

10. The method for designing a scroll compressor rotor bottom plate according to claim 1, characterized in that: After step 9), it also includes: adding an annular wear-resistant protrusion to the outer periphery of one side of the movable plate bottom plate away from the movable plate vortex tooth, the height of the wear-resistant protrusion is 0.2-0.5mm, the inner circle of the wear-resistant protrusion is close to the anti-rotation hole, and the outer circle of the wear-resistant protrusion is the outer circle of the movable plate bottom plate.

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