Scroll and manufacture method therefor
Disclosed herein is a scroll for scroll compressor, comprising an orbiting and a stationary spiral each composed of a spiral body and a base plate, in which one of the spirals is made of metal and the other is made of elastic and plastic material to provide a mutual axial and radial compensating effect. The use of elastic and plastic material for making one of the spirals allows the two spirals to contact each other surface to surface instead of linear contact, and provides a sealing effect due to deformation of the material caused by squeezing. These spirals can be formed by molding, eliminating the need of machining and surface hardening, and providing a hard oxidized layer on their surface. The use of hard material for a spiral and soft material for another spiral can lower the requirement for precision of geometric shape without loss in operating efficiency, and consequently lower their production cost. Such features also reduce noise and vibration in orbiting, make them more wear resistant, and extend their service life.
The present invention relates to a scroll for scroll compressor, particularly a low-cost and highly efficient scroll for scroll compressor.
BACKGROUND OF THE INVENTION Traditionally the orbiting and stationary spirals in scroll compressor are made of metal. As shown in
The main objective of the present invention is to provide a scroll for scroll compressor and its manufacture method. Through change on materials for making the scroll, two spirals composing the scroll contact each other surface to surface, provide a good sealing effect, and eliminate the need of axial and radial compensation because of the properties of the materials used. Use of such materials also lowers noise and vibration during orbiting, makes the spirals highly wear resistant, and extends their service life. Consequently, the requirement for precision and geometric shape tolerance is lowered, the production cost can be lowered.
The scroll according to the present invention comprises an orbiting spiral and a stationary spiral each composed of a spiral body and a corresponding base plate. One of these spirals made of metal, while the other is made of non-metal material with elastic and plastic property. The properties of such materials provide a good sealing effect and eliminate the need of axial and radial compensation during orbiting.
In the present invention, either the orbiting or the stationary spiral is made of metal, while the other is made of elastic and plastic non-metal material.
The spiral body for one of these spirals has a frame.
The said frame is made of porous sheet, either metal or plastic porous sheet.
The frame and the base plate can be formed as an integrated part.
The said non-metal material can be either engineering plastic product, or phenolic resin or epoxy resin.
The scroll manufacture method according to the present invention includes the following steps:
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- making spiral bodies with sheet;
- fixing each spiral body to a metal base plate; and
- coating the outer surface of each spiral body and the bottom of each metal base plate contacting with the spiral body with an elastic material, or forming thereon a plastic layer by molding.
The aforesaid elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.
Another scroll manufacture method according to the present invention includes the following steps:
-
- coating the sheet with elastic material;
- making spiral bodies; and
- fixing each spiral body to a metal base plate.
Another scroll manufacture method according to the present invention includes the following steps:
-
- Forming of a frame for spiral body on each metal base plate by molding; and
- Coating the frame and the metal base plate with elastic material, or forming thereon a plastic layer by molding.
The fourth method for production of the scroll according to the present invention includes forming of a scroll on a metal base plate with elastic material by molding.
According to the present invention one of the spirals is made of metal, while the other spiral is made of elastic and plastic material. While the orbiting spiral is orbiting around the stationary spiral, the elasticity and plasticity of one of these spirals cause the spirals to contact each other surface to surface instead of linear contact in the prior art. Such a design provides a sealing effect by deformation of the material due to squeezing effect, extends the geometric shape tolerance, such as to about 100 μm, without scarifying the required performance and efficiency, and eliminates the need of a complicated axial and radial compensation process due to their deformation and expansion at high temperature. Moreover, as these spirals can be made by molding, complicated machining and surface hardening are not required, the hardness of an oxidized layer formed on the surface of the spirals formed by molding is higher than that achieved by surface hardening treatment. On the other hand, as one of the spirals is made of hard material, while the other is made of soft material, noise and vibration are relatively low during orbiting; their wear resistance and their service life are improved, and requirement for precision and tolerance of geometric shape is lowered. Consequently, their production cost is lowered.
BRIEF DESCRIPTION OF THE DRAWINGS
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The said non-metal material can be polytetrafluoroethylene, PU (polyurethane) or synthetic rubber.
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As described above, according to the present invention one of the spirals is made of metal, while the other spiral is made of elastic and plastic material. During the orbiting the elasticity and plasticity of one of these spirals cause the spirals to contact each other surface to surface, provide a sealing effect by deformation of the material due to squeezing effect, eliminate the need of a complicated axial and radial compensation because there is a deformation and expansion at high temperature. Moreover, as one of these spirals is made of hard material, and the other is made of soft material, noise and vibration are relatively low during orbiting; their wear resistance and their service life are improved, and requirement for precision and tolerance of geometric shape is lowered. Consequently, their production cost is lowered.
Claims
1-20. (canceled)
21. A scroll comprising an orbiting spiral and a stationary spiral each composed of a spiral body and a corresponding base plate, characterized by using of elastic or plastic material, or elastic and plastic material for making either or both the spirals, and making use of the elasticity or plasticity of such material to decrease the unevenness of the contact surface of these two spirals and increase the contact surface area by deformation of the material caused by squeezing upon orbiting of the orbiting spiral around the stationary spiral so as to provide a sealing effect between two contact surfaces of these two spirals and a mutual axial and radial compensating effect during orbiting.
22. The scroll as claimed in claim 21 wherein either or both of the orbiting spiral and the stationary spiral are made of elastic or/and plastic material.
23. The scroll as claimed in claim 21 wherein the elastic or plastic material is polytetrafluoroethylene, polyurethane or synthetic rubber.
24. The scroll as claimed in claim 21 wherein the surface of the frame of either or both of the orbiting spiral and the stationary spiral is coated with elastic or/and plastic coating material.
25. The scroll as claimed in claim 24 wherein the frames of the orbiting spiral and the stationary spiral are formed with a plurality of through or blind pores to increase the bond strength of the said coating material.
26. A scroll manufacture method characterized by the following steps:
- making spiral bodies with sheet;
- fixing each spiral body to a metal base plate; and
- coating the outer surface of each spiral body and the bottom of each metal base plate contacting with the spiral body with an elastic material, or forming thereon a plastic layer by molding.
27. The scroll manufacture method as claimed in claim 26 wherein the said sheet is formed with a plurality of pores.
28. The scroll manufacture method as claimed in claim 26 herein the said sheet is a metal or plastic sheet.
29. The scroll manufacture method as claimed in claim 26 wherein said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.
30. A scroll manufacture method characterized by the following steps:
- coating the sheet with elastic material; then
- making spiral bodies; and
- fixing each spiral body to a metal base plate.
31. The scroll manufacture method as claimed in claim 30 wherein said sheet is formed with a plurality of pores.
32. The scroll manufacture method as claimed in claim 30 wherein said sheet is a metal or plastic sheet.
33. The scroll manufacture method as claimed in claim 30 wherein said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.
34. A scroll manufacture method characterized by the following steps:
- Forming of a frame for spiral body on each metal base plate by molding; and
- Coating the frame and the metal base plate with elastic material, or forming thereon a plastic layer by molding.
35. The scroll manufacture method as claimed in claim 34 wherein the metal base plate and the frame for the spiral body are formed as an integrated part by molding.
36. The scroll manufacture method as claimed in claim 34 wherein the said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.
37. A scroll manufacture method characterized by forming of the scroll on the metal base plate with elastic material by molding.
38. The scroll manufacture method as claimed in claim 37 wherein the said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.
Type: Application
Filed: May 11, 2004
Publication Date: May 10, 2007
Applicants: Guangcheng Zhou (Xuzhou), Xiaoliang Zhou (Xuzhou), Hiuyun Chen (Shanghai)
Inventors: Jinsong Zhou (Jiangsu Province), Guangcheng Zhong (Jiangsu Province)
Application Number: 10/556,547
International Classification: F01C 1/02 (20060101); F04C 2/00 (20060101); F01C 1/063 (20060101);