CN113513472A - Non-orbiting scroll of scroll compressor, intermediate member for manufacturing non-orbiting scroll, and method - Google Patents
Non-orbiting scroll of scroll compressor, intermediate member for manufacturing non-orbiting scroll, and method Download PDFInfo
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- CN113513472A CN113513472A CN202010278829.3A CN202010278829A CN113513472A CN 113513472 A CN113513472 A CN 113513472A CN 202010278829 A CN202010278829 A CN 202010278829A CN 113513472 A CN113513472 A CN 113513472A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0269—Details concerning the involute wraps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/10—Manufacture by removing material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/21—Manufacture essentially without removing material by casting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/20—Manufacture essentially without removing material
- F04C2230/22—Manufacture essentially without removing material by sintering
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention provides a non-orbiting scroll of a scroll compressor and an intermediate piece and a method for manufacturing the non-orbiting scroll, the non-orbiting scroll comprising an end plate, a scroll blade provided on one side surface of the end plate, and an outer peripheral wall extending axially from an outer peripheral edge of the end plate on the one side surface of the end plate, wherein the scroll blade extends in a profile direction so as to define a passage extending in the profile direction by the scroll blade, the end plate and the outer peripheral wall, the passage has a passage bottom wall and a passage side wall defining the passage, and the passage comprises a passage end section located at an outermost portion in the profile direction, the passage end section is provided with a recess adapted to receive a tool at the start of feed during machining of the non-orbiting scroll to avoid or reduce contact of the tool with the passage bottom wall and/or the passage side wall at the feed.
Description
Technical Field
The invention relates to a static vortex of a vortex compressor. The invention also relates to an intermediate piece and a method for manufacturing a non-orbiting scroll of a scroll compressor.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Existing scroll compressors typically include a scroll assembly, a motor, a rotating shaft, a housing, and the like. Wherein the scroll assembly includes a non-orbiting scroll and an orbiting scroll that engage each other such that a series of compression chambers are formed between the non-orbiting and orbiting scrolls when the scroll compressor is in operation, thereby achieving compression of the working fluid. The static vortex and the movable vortex are used as high-precision parts of compressed gas, and a final finished product can be obtained only by casting molding, rough machining, finish machining and other post-treatment processes or by pressing, sintering and other processes of powder metallurgy in the manufacturing process. Certain machining allowance is reserved among the casting, the rough machined part, the powder metallurgy intermediate part and the fine machined part. The size of the machining allowance is closely related to material cost, machining time, machining cost, mechanical property and the like, so that the design of the machining allowance is very important.
In the machining process of the fixed scroll, the area near the air inlet of the fixed scroll can be used as a starting point of profile roughing of rough machining and finish machining, namely, when rough machining is carried out on a fixed scroll casting or finish machining is carried out on a fixed scroll rough machining part or powder metallurgy intermediate part, a milling cutter can start to feed from the vicinity of the air inlet of the fixed scroll. Therefore, in the vicinity of the inlet port of the non-orbiting scroll, the cutter comes into contact with the casting or rough workpiece, and the cutter receives a great resistance from the end plate of the casting or rough workpiece or powder metallurgy, the side wall of the scroll blade and/or the outer peripheral wall of the non-orbiting scroll, so that chipping and even cutting are liable to occur, resulting in rejection of the cutter and the workpiece.
Therefore, it is desirable to provide a method for manufacturing a non-orbiting scroll, which can reduce the rejection rate of a tool and a workpiece in the manufacturing process as much as possible, thereby reducing the production cost and improving the production efficiency.
Disclosure of Invention
The invention aims to improve the service life of a cutter and reduce the rejection rate of the cutter and a workpiece in the processing process of the static vortex. In one aspect, the present invention provides an intermediate member (a casting or rough-machined member or powder metallurgy member) for manufacturing a non-orbiting scroll of a scroll compressor, and in another aspect, the present invention provides a method for manufacturing a non-orbiting scroll of a scroll compressor, such that the rejection rate of a tool and a workpiece is significantly reduced and the life of the tool is significantly prolonged during the manufacturing of the non-orbiting scroll using the intermediate member or the method.
According to one aspect of the present invention, there is provided a non-orbiting scroll of a scroll compressor, the non-orbiting scroll comprising an end plate, a scroll blade provided on one side surface of the end plate, and an outer peripheral wall extending axially from an outer peripheral edge of the end plate at the one side surface of the end plate, wherein the scroll blade extends in a profile direction so as to define a passage extending in the profile direction by the scroll blade, the end plate and the outer peripheral wall, the passage having a passage bottom wall and a passage side wall defining the passage, and the passage comprising a passage end section located outermost in the profile direction, the passage end section being provided with a recess adapted to receive a cutter at the start of feed during machining of the non-orbiting scroll to avoid or reduce contact of the cutter with the passage bottom wall and/or the passage side wall at the time of feed.
Optionally, the recess comprises a depression at the channel bottom wall and/or a side recess recessed at an inner one of the channel side walls.
Alternatively, the recess includes both the depressed portion and the side recess, and the depressed portion and the side recess are formed to communicate with each other such that the recess is configured as an integral recess.
Optionally, a scroll assembly inlet is provided at the peripheral wall, the passage end section being located adjacent the scroll assembly inlet.
Optionally, at least a portion of the recess is disposed outside of the flow path of the working fluid from the scroll assembly inlet into the passage.
In accordance with another aspect of the present invention, there is provided an intermediate member for manufacturing a non-orbiting scroll of a scroll compressor, the intermediate member includes an end plate, a scroll blade provided on one side surface of the end plate, and an outer peripheral wall extending in an axial direction from an outer peripheral edge of the end plate at the one side surface of the end plate, wherein the scroll blade extends in a profile direction such that a passage extending in the profile direction is defined by the scroll blade, an end plate and an outer peripheral wall, the passage having a passage bottom wall and a passage side wall defining the passage, and the channel comprises a channel end section located outermost in the direction of the profile, which channel end section is provided with a recess adapted to receive a tool when the tool is started in the machining of the intermediate piece, in order to avoid or reduce the contact of the tool with the bottom wall of the channel and/or the side wall of the channel when the tool is fed, and the intermediate piece is a casting piece or a rough machining piece or a powder metallurgy piece.
Optionally, the recess has a depth of indentation greater than the machining allowance of the casting or rough machined part or powder metallurgy part, such that at least a portion of the recess remains in the finished part after machining of the intermediate part to produce the finished product.
Optionally, the final product is the non-orbiting scroll of the scroll compressor described above.
According to yet another aspect of the present invention, there is provided a method of manufacturing a non-orbiting scroll of a scroll compressor using the above-described intermediate member.
Optionally, in the case that the intermediate member is a casting, the method comprises:
casting: casting a non-orbiting scroll casting and forming a recess in the non-orbiting scroll casting in the casting step;
rough machining: in the rough machining step, a cutter enters a concave part in the fixed scroll casting during feeding so as to start rough machining on the fixed scroll casting to machine a fixed scroll rough machining part, and the concave part is reserved in the fixed scroll rough machining part after the rough machining step is finished; and
and (3) finishing: in the finishing step, the tool is advanced into the recess in the non-orbiting scroll rough work while feeding, so that finishing of the non-orbiting scroll rough work is started to machine the non-orbiting scroll finish, and at least a part of the recess remains in the non-orbiting scroll finish after the finishing step is ended.
Optionally, in case the intermediate piece is a rough machined piece, the method comprises:
casting: casting a non-orbiting scroll casting in the casting step and without casting a recess in the non-orbiting scroll casting;
rough machining: in the rough machining step, rough machining is carried out on the static vortex casting to machine a static vortex rough machining part and form a concave part in the static vortex rough machining part; and
and (3) finishing: in the finishing step, the tool is advanced into the recess in the non-orbiting scroll rough work while feeding, so that finishing of the non-orbiting scroll rough work is started to machine the non-orbiting scroll finish, and at least a part of the recess remains in the non-orbiting scroll finish after the finishing step is ended.
Optionally, in the case that the intermediate piece is a powder metallurgy piece, the method comprises:
powder mixing step: adding alloy element powder and additives into powder taking iron powder or aluminum powder or copper powder as main elements and fully mixing to form mixed powder;
powder forming: pressing the mixed powder into a green body and forming a concave part on the green body;
sintering and post-processing steps: sintering the green body, and then carrying out post-treatment or not according to the requirement to form a static vortex powder metallurgy part, wherein the static vortex powder metallurgy part is reserved with a concave part;
and (3) finishing: in the finishing step, the tool is advanced into the recess in the non-orbiting scroll powder metallurgy member while feeding, so that finishing of the non-orbiting scroll powder metallurgy member is started to machine the non-orbiting scroll finish member, and at least a portion of the recess remains in the non-orbiting scroll finish member after the finishing step is ended.
Optionally, in the rough machining step and/or the finishing step, one or more of the following operations are performed simultaneously with a single tool: milling is performed over the entire radial width of the channel bottom wall, milling is performed on the inner one of the channel side walls and milling is performed on the outer one of the channel side walls.
Drawings
Features and advantages of one or more embodiments of the present invention will become more readily apparent from the following description taken in conjunction with the accompanying drawings. The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. The figures are not drawn to scale and some features may be exaggerated or minimized to show details of particular components. In the drawings:
FIG. 1 is a transverse cross-sectional view of a non-orbiting scroll intermediate member of a scroll compressor of a comparative example;
FIG. 2 is a longitudinal cross-sectional view of a non-orbiting scroll intermediate member of a scroll compressor of a comparative example, wherein the hatched portion shows machining allowances of a cast member and a rough machined member;
FIG. 3a is a partial schematic view of a non-orbiting scroll roughing member of a comparative example, wherein the air inlet region of the non-orbiting scroll is shown;
FIG. 3b is a partial schematic view of a non-orbiting scroll finishing member of a comparative example, showing an air inlet region of the non-orbiting scroll, wherein a shaded portion shows a machining allowance of the finishing member and a rough member;
FIG. 4 is a top view of a non-orbiting scroll product of a comparative example;
FIG. 5 is a top view of a non-orbiting scroll casting according to a first embodiment of the present invention;
FIG. 6 is a partial schematic view of a non-orbiting scroll casting according to a first embodiment of the present invention showing the inlet region of the non-orbiting scroll.
FIG. 7a is a partial schematic view of a non-orbiting scroll roughing in accordance with the first embodiment of the present invention showing the inlet region of the non-orbiting scroll;
FIG. 7b is a partial schematic view of a non-orbiting scroll finishing member according to a first embodiment of the present invention, showing the inlet region of the non-orbiting scroll; and
FIG. 8 is a partial schematic view of a non-orbiting scroll finishing member according to a second embodiment of the present invention, showing the inlet region of the non-orbiting scroll.
Detailed Description
Embodiments will now be described more fully with reference to the accompanying drawings.
The embodiments are provided so that this disclosure will be thorough and will more fully convey the scope to those skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods to provide a thorough understanding of embodiments of the present invention. It will be apparent to those skilled in the art that specific details need not be employed, that embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the invention. In some embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
An intermediate member and a machining method in a machining process of a non-orbiting scroll of a scroll compressor of a comparative example will be described with reference to fig. 1 to 4. As known to those skilled in the art, the non-orbiting scroll often requires casting, rough machining, finish machining or powder metallurgy processes and other post-processing processes to obtain the final product. Wherein, certain machining allowance is reserved among the casting, the rough machining part, the powder metallurgy intermediate part and the fine machining part of the static vortex. The static vortex casting is a workpiece with a rough surface and many defects, materials are required to be removed through rough machining, a rough machined part is obtained on the premise that certain precision requirements are guaranteed, and then the materials are further removed on the static vortex rough machined part through finish machining, so that a static vortex fine machined part meeting the precision requirements of size, position and shape is obtained; the static vortex powder metallurgy intermediate part is also a workpiece with a relatively rough surface and relatively low dimensional precision, and needs to be subjected to finish machining to remove materials, so that a static vortex finish machining part meeting the precision requirements of size, position and shape is obtained.
Fig. 1 and 2 show a transverse sectional view and a longitudinal sectional view, respectively, of an intermediate piece of a non-orbiting scroll 100. The intermediate member of the non-orbiting scroll 100 refers to a workpiece before a finished product is obtained in the non-orbiting scroll machining process, such as a non-orbiting scroll casting or a rough machined member or a powder metallurgy intermediate member. As shown in fig. 1, the intermediate member of non-orbiting scroll 100 may include an end plate 16, scroll blades 14 axially extending from one side surface of end plate 16, and an outer peripheral wall 19 axially extending from one side surface of end plate 16 at an outer peripheral edge of the end plate. As shown in the drawing, an intake port 12 of a compression mechanism (scroll assembly) is provided at an outer peripheral wall 19. Scroll blades 14 extend in a predetermined linear direction to the center of the non-orbiting scroll. Thus, a passage 18, also extending in the profile direction, is defined on one side of end plate 16 by end plate 16, scroll blade 14 and outer peripheral wall 19. The passageway 18 includes a passageway end section CE at the outermost portion in the contoured direction, adjacent the air inlet 12 and bounded at its outer end by a passageway end wall a, as shown in fig. 1. When the non-orbiting scroll 100 is assembled with the orbiting scroll as a compression mechanism and installed in the housing of a scroll compressor, the scroll blades 14 of the non-orbiting scroll and the scroll blades of the orbiting scroll can engage with each other such that a series of compression pockets of varying volume are formed between the scroll blades 14 of the non-orbiting scroll and the scroll blades of the orbiting scroll, i.e., in the passage 18, thereby achieving compression of the working fluid. The inlet port 12 of the non-orbiting scroll 100 may be in fluid communication with a radially outward located compression chamber (also referred to as a suction chamber) such that working fluid enters the suction chamber via the inlet port 12. Here, it is to be noted that the intake port 12 may be provided at the outer peripheral wall 19 as shown, however, it is also conceivable that the intake port may be provided at a radially outer portion of the non-orbiting scroll end plate in the case where, for example, the scroll compressor is a high-pressure side compressor.
The shaded portion in fig. 2 shows the machining allowance of the intermediate member of the non-orbiting scroll 100. It should be noted that, although both end plate side surfaces of the intermediate member of the non-orbiting scroll 100 are shown with a machining allowance as shown in fig. 2, only machining of the side of the end plate 16 of the non-orbiting scroll 100 having the scroll blade 14 is described herein, and in particular, improvements are proposed for machining in the passage 18, i.e., machining of the passage side wall (formed by the side wall or outer peripheral wall 19 of the scroll blade 14) and the passage bottom wall (formed by one side surface of the end plate 16). In the course of rough machining of the casting of the non-orbiting scroll 100 or finish machining of the rough machined part of the non-orbiting scroll 100 or the powder metallurgy intermediate part of the non-orbiting scroll 100, machining allowance is usually removed by cutting (milling) the bottom wall and the side wall of the passage 18 with a tool such as a milling cutter. Specifically, the tool is fed from the passage end section CE, the tool simultaneously contacts the sidewall of scroll blade 14 and the bottom wall of passage 18 radially inward of passage 18 and cuts the machining allowance of the sidewall of scroll blade 14 and the bottom wall of passage 18, and then the tool moves in the profile direction within passage 18 and finally reaches the center of end plate 16, completing the removal of the machining allowance throughout passage 18. As shown, the channel end section CE is located adjacent the air inlet 12 and the channel end wall a is offset outwardly in the contoured direction compared to the edge 121 of the air inlet 12.
Further, it should be noted that in the example herein, the cutter cuts both the sidewall of scroll blade 14 radially inward of passage 18 and the bottom of passage 18. It will be appreciated by those skilled in the art that the cutting tool may cut the bottom of passage 18 and the side walls (or inner side wall surfaces of the outer peripheral wall) of scroll blade 14 on both sides of passage 18, or may cut only the bottom wall of passage 18 or only the side walls (or inner side wall surfaces of the outer peripheral wall) of scroll blade 14 on one or both sides of passage 18.
The rough machining and finishing processes will be described in comparison with fig. 3a, 3b and 4. Fig. 3a shows a partial schematic view of a rough part obtained after rough machining of the casting of the non-orbiting scroll 100. As shown in fig. 3a, when the casting of the non-orbiting scroll 100 is roughly machined, a rough machining tool is fed from a position slightly inward in the profile direction than the passage end wall a at the passage end section CE while cutting, for example, an inner passage side wall (formed by a side wall of the scroll blade 14) defining the inside of the passage 18 and a bottom wall of the passage 18, thereby removing a machining allowance of the rough machining to obtain a rough machined piece. The depth of the feed (including the axial depth and the lateral depth) is consistent with the thickness of the machining allowance. The choice of the (radial) width of the tool depends on the radial width of the channel 18, etc. For example, the width of the cutter may be greater than or equal to the radial width of the channel 18. In the case of a tool having a width greater than the radial width of the channel 18, the tool can mill both side walls of the channel as well as the entire channel bottom wall, while in the case of a tool having a width equal to the radial width of the channel 18, the tool can mill the entire channel bottom when only the channel bottom wall needs to be milled. The roughing tool travels in the direction of the profile and leaves a tool-wide contour a1 in the channel 18. That is, within contour line A1, the machining allowance for the roughing of the casting surface is removed, resulting in a rough machined surface 162, while the area outside contour line A1, e.g., between passage end wall A and the outer end of contour line A1 in the mold line direction, remains as casting surface 161.
Fig. 3b then shows a partial schematic view of the finished part obtained after finishing the rough part of the non-orbiting scroll 100 in fig. 3 a. The finishing process is similar to the rough machining, and when the rough machined part of the non-orbiting scroll 100 is finished, as shown in fig. 3b, the finishing tool may be fed from a position further inward in the mold line direction than the outer end portion of the contour line a 1. The finishing tool cuts further on the rough machined surface 162 and follows the contour direction leaving a tool rough contour a2 in the passage 18. The further milled part in the lateral (radial) direction of the finish is shown in phantom in fig. 3b, with the region enclosed by contour line a2 being of greater radial width than the region enclosed by contour line a 1. That is, on the one hand, the finishing tool further mills the inboard channel sidewall (formed by the sidewall of scroll blade 14) bounding the inside of channel 18 so that the radially inboard line of contour a2 is closer to the center of the non-orbiting scroll 100 than the radially inboard line of contour a1, on the other hand, the finishing tool further cuts the bottom wall of channel 18, and the finishing tool may further mill the outboard channel wall bounding the outside of channel 18 so that the radially outboard line of contour a2 is radially further outward than the radially outboard line of contour a 1. Formed as finish surface 163 within contour a2, a rough machined surface 162 may remain outside contour a2, for example, in the area between the outer ends of contour a1 and the outer ends of contour a 2.
Fig. 4 shows the finished product of the non-orbiting scroll 100 obtained after rough machining and finish machining of the casting. On the finished non-orbiting scroll, the finished surface 163 is formed almost completely in the passage 18, leaving only traces of the machining process at the passage end section CE, i.e. there may be an outer end in the profile direction of the rough contour line a1 and an outer end in the profile direction of the finished contour line a2 at the passage end section CE of the finished non-orbiting scroll 100, the outer end of the rough contour line a1 being more inward in the profile direction than the passage end wall a and the outer end of the finished contour line a2 being more inward in the profile direction than the outer end of the rough contour line a 1. However, it will be understood by those skilled in the art that the outer end of the finish contour a2 may also coincide with the outer end of the rough contour a1, i.e., the feed position of the finish tool may be the same as the feed position of the rough tool.
In addition, as will be understood by those skilled in the art, when the non-orbiting scroll 100 is manufactured by a powder metallurgy process, the powder metallurgy intermediate member is formed by pressing and sintering, and then the powder metallurgy intermediate member is finished to obtain a finished product of the non-orbiting scroll without going through a rough machining step, so that on the non-orbiting scroll 100 manufactured by the powder metallurgy process, the inside of the passage 18 is almost completely formed as the finished surface 163, and only the outer end portion in the profile line direction of the finished contour line a2 exists at the passage end section CE.
As can be seen from the machining process, whether rough machining or finish machining, the tool contacts the channel side wall and/or the channel bottom wall of the channel 18 when feeding, the contact area is large, the initial resistance force suffered by the tool is also large, and thus the tool is easily damaged.
In order to reduce the resistance suffered by the cutter in the feed and thereby reduce the damage of the cutter, in the first embodiment of the present invention, as shown in fig. 5 and 6, a recess RP is formed at the passage end section CE of the casting of the non-orbiting scroll 100. The recess RP comprises a sunken portion 17 sunken at the channel bottom wall of the channel 18 and a side recess 15 recessed at the inner channel side wall of the channel 18. In the example shown in the figure, the depressed portion 17 and the side recessed portion 15 communicate with each other to form a single body, thereby constituting a mushroom-shaped recessed portion RP. The subsidence 17 is configured to subside compared to the casting surface 161, the subsidence depth being greater than the machining allowance at the channel bottom wall of the channel 18; side recess 15 is configured to be recessed into the sidewall of scroll blade 14 (the inner sidewall that defines the inside of passage 18) to a depth greater than the machining allowance of the sidewall of scroll blade 14, thereby ensuring that the bottom and inner sidewalls of passage 18 are not contacted in recess RP during tool feed. Preferably, the recessed depth of the recess RP (including the depression depth of the depression 17 and/or the recessed depth of the side recesses 15) is preferably 1 to 3mm, thereby securing the strength of the casting while reducing the contact area of the tool with the casting. The depth of recess RP can be flexibly adjusted according to the machining allowance and the wall thickness of scroll blade 14. In addition, since the tool is often fed from a position further inward in the profile direction than the channel end wall a, the recess RP may be arranged such that: the outer contour-wise end of the recess RP, which is immediately adjacent to, or even coincides with, the channel end wall a, has its contour-wise inner end in the contour-wise direction beyond the edge 121 of the gas inlet 12, so that it is ensured that the recess RP can accommodate at least a part of the tool when the tool is being fed. Preferably, at least a portion of the recess RP may be disposed outside of the flow path of the working fluid entering the passage 18 from the inlet port 12, i.e., the recess RP may be outwardly offset in the contoured direction relative to the inlet port 12, such that the recess RP has little to no effect on the flow of the inlet fluid during use of the final product.
Referring to fig. 7a and 7b, when the casting of the non-orbiting scroll 100 according to the first embodiment of the present invention is roughly machined, the cutter is fed from the recess RP, and since the depth of the feed to the passage bottom wall of the passage 18 is smaller than the depth of the depression 17 and the depth of the feed to the side wall of the scroll blade 14 is smaller than the depth of the depression of the side recess 15, the cutter does not come into contact with the passage bottom wall of the passage 18 and the side wall of the scroll blade 14 (e.g., the inside passage side wall defining the inside of the passage 18) in the depression 17, but only contacts the passage bottom wall of the passage 18 and the side wall of the scroll blade 14 at the edge of the recess RP. In comparison with the cutting-in process shown in fig. 3a and 3b, for example, the tool needs to contact the bottom wall of the passage 18 and the side wall of the scroll blade 14 at the outer end of the entire contour a1 or a2, and the contact area is larger for the casting without the recess RP, while for the casting with the recess RP shown in fig. 7a and 7b, the tool no longer contacts the bottom wall of the passage 18 and the side wall of the scroll blade 14 at the outer end of the contour a1 or a2 (as shown by the dotted lines in fig. 7a and 7 b) located in the recess RP, thereby reducing the contact area of the tool with the machining surface, reducing the resistance to the tool during cutting and reducing the risk of damage to the tool.
It should be noted that, although the recess RP is implemented as a mushroom-shaped integrated recess in the embodiment of the present invention, it may be understood by those skilled in the art that the recess RP may be implemented in various shapes as long as it includes the depressed portion 17 depressed at the bottom wall of the passage 18 and the side recess 15 recessed toward the inside of the sidewall of the scroll blade 14. The recess RP may be implemented to include both the subsidence part 17 and the side recess part 15 according to actual needs, but they are not communicated but formed independently of each other. In addition, recess RP may also have only a dip 17 or only a side recess 15 to reduce the area of the cutter in contact with the bottom wall of passage 18 or the side wall of scroll blade 14 singly.
Thus, in the method of manufacturing a non-orbiting scroll according to the first embodiment, it is possible to first provide a casting mold including the concave portion RP, with which a casting of the non-orbiting scroll 100 formed with the concave portion RP is cast; then, the roughing tool is caused to enter the recess RP at the time of feed, and is caused to move in the passage 18 along the profile line direction, thereby completing cutting of the roughing allowance in the passage 18; finally, the finishing tool is brought into the recess RP during the feed and moved within the channel 18 in the profile direction, thereby completing the cutting of the finishing allowance within the channel 18 and finally obtaining the finished product of the non-orbiting scroll 100. Since the recessed depth of the recess RP is greater than the machining allowance of the casting (i.e., the recessed depth of the sunken portion 17 is greater than the machining allowance of the bottom wall of the passage 18, and the recessed depth of the side recess 15 is greater than the machining allowance of the passage inner side wall of the passage 18), a part of the recess RP remains in the finished product of the non-orbiting scroll 100.
In the first embodiment, the design of the concave part RP is flexible, the concave depth can be properly adjusted according to the machining allowance and the wall thickness of the scroll blade, the casting difficulty is low, the contact area between the rough machining cutter and the intermediate piece when the finish machining cutter is fed can be effectively reduced, the cutting resistance is reduced, the service life of the cutter is prolonged, and the cost can be saved on the material. Furthermore, the method according to the first embodiment also has good versatility and can be adapted for vortex optimization in all platforms.
As will be understood by those skilled in the art, in the method of manufacturing the non-orbiting scroll through a casting process, the recess RP may be directly formed on the casting by using a mold with a recess in the casting process, and the recess RP may also be formed during rough machining. For a product which has been opened, it is possible to manufacture by trimming the die and then adopting the first embodiment, or to avoid waste caused by re-opening the die, as shown in the second embodiment shown in fig. 8, it is possible to machine a recess RP at the channel end section CE of the rough machined part by milling or the like at rough machining so that the tool can be accommodated in the recess RP at the time of feed at the time of subsequent finish machining, thereby reducing the resistance to which the finish machining tool is subjected at the time of feed. Because finishing tools are typically more delicate and expensive, reducing the damage to and improving the life of finishing tools can greatly reduce machining costs.
Thus, in the method of manufacturing a non-orbiting scroll according to the second embodiment, it is possible to first provide a casting mold without a concave portion, with which a casting of the non-orbiting scroll 100 without the concave portion RP is cast; then, a roughing tool is fed from the passage end section CE of the casting and moved in the passage 18 along the profile direction, thereby completing the cutting of the roughing allowance in the passage 18 while machining the recess RP at the passage end section CE; finally, the finishing tool is received in the recess RP while being fed, and is moved within the passage 18 in the mold line direction, thereby completing the cutting of the finishing allowance within the passage 18 and finally obtaining the finished product of the non-orbiting scroll 100. Similar to the method of the first embodiment, at least a portion of the recess RP also remains in the finished non-orbiting scroll 100.
The method of manufacturing a non-orbiting scroll according to the second embodiment has advantages similar to those of the method according to the first embodiment, and can optimize a product which has been opened, and thus has a wider application range.
In addition, when the non-orbiting scroll is manufactured by a powder metallurgy process, a method of manufacturing the non-orbiting scroll similar to that in the first and second embodiments may also be adopted. Specifically, firstly, adding some alloying element powder such as Cu, Mo, Ni, Cr, Mn, P and the like into powder taking iron powder or aluminum powder or copper powder and the like as main elements, and adding some additives such as graphite, a lubricant and the like, and fully mixing the powder of the main elements and the powder of the alloying elements with the additives to form mixed powder; then, providing a pressing die including a concave portion RP (the pressing die is similar in structure to the casting die of the non-swirl and will not be described herein again), and pressing the loose mixed powder into a green body having a shape, a size, and a density and a strength, the green body having the concave portion RP formed at the channel end section CE; thirdly, sintering the green body, namely heating, preserving heat and cooling the green body at a temperature lower than the melting point of the basic components of the green body, wherein in the process, powder particles are bonded, the powder aggregate is changed into a recrystallization aggregate, the strength of the generated sintered body is further increased, and the mechanical and mechanical properties are obviously improved, although the generated powder metallurgy part still has a concave part RP; then, the sintered powder metallurgy part is subjected to post-treatment, the post-treatment can be selected or not according to the actual situation, and the post-treatment mainly comprises the following steps: shaping (obviously improving the size and surface roughness of the part), oil immersion, steam treatment, heat treatment, deburring, cleaning and the like, and the powder metallurgy part subjected to post-treatment still has a concave part RP; finally, the powder-metallurgical part after-treatment (or not after-treatment if necessary) is subjected to finishing, the finishing tool is received in the recess RP when being fed, and the finishing tool is moved in the channel 18 along the profile line direction, so that the cutting of the finishing allowance in the channel 18 is completed and the finished product of the non-orbiting scroll 100 is finally obtained, in which at least a part of the recess RP remains, similarly to the first embodiment.
Similar to the first embodiment, when the method for manufacturing the static vortex by adopting the powder metallurgy process is adopted, due to the low pressing difficulty and the flexible design of the concave part RP, the method not only can effectively reduce the contact area between the fine machining cutter and a powder metallurgy intermediate part during feeding, reduce the cutting resistance and further improve the service life of the cutter, but also can save the cost on materials. The method also has good universality and is suitable for producing various types of static vortexes.
Although various embodiments of the present invention have been described in detail herein, it is to be understood that this invention is not limited to the particular embodiments described and illustrated in detail herein, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the invention. All such variations and modifications are intended to be within the scope of the present invention. Moreover, all the components described herein may be replaced by other technically equivalent components.
Claims (13)
1. A non-orbiting scroll (100) of a scroll compressor comprising an end plate (16), a scroll blade (14) provided on one side surface of the end plate (16), and an outer peripheral wall (19) extending in an axial direction from an outer peripheral edge of the end plate (16) at one side surface of the end plate (16),
wherein the scroll blade (14) extends in a profile direction such that a channel (18) extending in the profile direction is defined by the scroll blade (14), the end plate (16) and the outer peripheral wall (19), the channel (18) having a channel bottom wall and a channel side wall delimiting the channel (18), and the channel (18) comprising a channel end section (CE) located outermost in the profile direction,
characterized in that the channel end section (CE) is provided with a Recess (RP) adapted to accommodate a tool at the start of a feed during machining of the non-orbiting scroll to avoid or reduce contact of the tool with the channel bottom wall and/or the channel side wall at the feed.
2. The non-orbiting scroll (100) of a scroll compressor of claim 1, wherein the Recess (RP) comprises a depression (17) at the channel bottom wall and/or a side recess (15) recessed at an inner one of the channel side walls.
3. The non-orbiting scroll (100) of a scroll compressor of claim 2, wherein said recess includes both said depressed portion and said side recess, and said depressed portion and said side recess are formed to communicate with each other so that said recess is configured as an integral recess.
4. The non-orbiting scroll (100) of a scroll compressor according to any one of claims 1 to 3, wherein a scroll assembly inlet port (12) is provided at the outer peripheral wall (19), the channel end section (CE) being located adjacent to the scroll assembly inlet port.
5. The non-orbiting scroll (100) of a scroll compressor of claim 4, wherein at least a portion of the recess is disposed outside of the flow path of working fluid from the scroll assembly inlet into the passage.
6. An intermediate member for manufacturing a non-orbiting scroll (100) of a scroll compressor, comprising an end plate (16), a scroll blade (14) provided on one side surface of the end plate (16), and an outer peripheral wall (19) extending in an axial direction from an outer peripheral edge of the end plate (16) at one side surface of the end plate (16),
wherein the scroll blade (14) extends in a profile direction such that a channel (18) extending in the profile direction is defined by the scroll blade (14), the end plate (16) and the outer peripheral wall (19), the channel (18) having a channel bottom wall and a channel side wall delimiting the channel (18), and the channel (18) comprising a channel end section (CE) located outermost in the profile direction,
characterized in that the channel end section (CE) is provided with a Recess (RP) adapted to accommodate a tool when starting to feed for machining the intermediate piece, to avoid or reduce contact of the tool with the channel bottom wall and/or the channel side wall when feeding,
the intermediate piece is a casting piece or a rough machining piece or a powder metallurgy piece.
7. The intermediate member for manufacturing a non-orbiting scroll (100) of a scroll compressor as claimed in claim 6, wherein the recessed depth of the recess is greater than the machining allowance of the cast or rough machined member or powder metallurgy member, so that at least a portion of the recess remains in the finished product after the machining of the intermediate member to produce the finished product.
8. Intermediate for manufacturing the non-orbiting scroll (100) of a scroll compressor according to claim 7, characterized in that the finished product is the non-orbiting scroll (100) of a scroll compressor according to claims 1 to 5.
9. A method of manufacturing a non-orbiting scroll of a scroll compressor using an intermediate member according to any one of claims 6 to 8.
10. The method of claim 9, wherein, where the intermediate piece is a casting, the method comprises:
casting: casting an orbiting scroll casting and forming the recess in the orbiting scroll casting in the casting step;
rough machining: in the rough machining step, the cutter is advanced into the concave portion in the non-orbiting scroll casting while feeding, so that rough machining of the non-orbiting scroll casting is started to machine a non-orbiting scroll rough part, and the concave portion is left in the non-orbiting scroll rough part after the rough machining step is finished; and
and (3) finishing: in the finishing step, the tool is advanced into the recess in the non-orbiting scroll rough work while feeding, so that finishing of the non-orbiting scroll rough work is started to machine a non-orbiting scroll finish, and at least a part of the recess remains in the non-orbiting scroll finish after the finishing step is ended.
11. The method according to claim 9, wherein in the case where the intermediate member is a rough part, the method comprises:
casting: casting a non-orbiting scroll casting in the casting step and not casting the recess in the non-orbiting scroll casting;
rough machining: in the rough machining step, rough machining is performed on the non-orbiting scroll casting to machine a non-orbiting scroll rough machined part and form the concave part in the non-orbiting scroll rough machined part; and
and (3) finishing: in the finishing step, the tool is advanced into the recess in the non-orbiting scroll rough work while feeding, thereby starting finishing of the non-orbiting scroll rough work to machine a non-orbiting scroll finish, and at least a portion of the recess remains in the non-orbiting scroll finish after the finishing step is ended.
12. The method according to claim 9, wherein in case the intermediate piece is a powder metallurgical piece, the method comprises:
powder mixing step: adding alloy element powder and additives into powder taking iron powder or aluminum powder or copper powder as main elements and fully mixing to form mixed powder;
powder forming: pressing the mixed powder into a green body and forming the concave portion on the green body;
sintering and post-processing steps: sintering the green body, and then carrying out post-treatment or not according to the requirement to form an electrostatic vortex powder metallurgy part, wherein the concave part is reserved in the electrostatic vortex powder metallurgy part;
and (3) finishing: in the finishing step, the tool is advanced into the recess in the non-orbiting scroll powder metallurgy to start finishing the non-orbiting scroll powder metallurgy to machine a non-orbiting scroll finish, and at least a portion of the recess remains in the non-orbiting scroll finish after the finishing step is ended.
13. The method according to any one of claims 9 to 12, characterized in that in the rough machining step and/or the finishing step, one of the following operations is performed with a single tool or a plurality of the following operations are performed simultaneously with a single tool: milling across the entire radial width of the channel bottom wall, milling an inboard one of the channel side walls, and milling an outboard one of the channel side walls.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278829.3A CN113513472A (en) | 2020-04-10 | 2020-04-10 | Non-orbiting scroll of scroll compressor, intermediate member for manufacturing non-orbiting scroll, and method |
| PCT/CN2020/120782 WO2021203662A1 (en) | 2020-04-10 | 2020-10-14 | Static scroll of scroll compressor, and intermediate member and method for manufacturing static scroll |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010278829.3A CN113513472A (en) | 2020-04-10 | 2020-04-10 | Non-orbiting scroll of scroll compressor, intermediate member for manufacturing non-orbiting scroll, and method |
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| CN113513472A true CN113513472A (en) | 2021-10-19 |
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