Upper bearing cover of rotor compressor pump body and manufacturing method
By using inserts and lightweight materials to manufacture the upper bearing cover of the rotary compressor, the problems of heavy weight and insufficient wear resistance of the upper bearing cover are solved, achieving lightweight design and cost reduction.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- NINGBO YONGWEI GROUP
- Filing Date
- 2025-12-03
- Publication Date
- 2026-07-30
AI Technical Summary
The existing rotary compressor has a heavy upper bearing cover, which results in a large overall weight and rotational inertia. Furthermore, the low-density material cannot meet the wear resistance requirements.
The upper bearing cover is manufactured by combining inserts and lightweight materials. The bushing inserts and vent inserts are made of aluminum alloy, magnesium alloy, titanium alloy or engineering plastic. They are injection molded or die-cast and combined with the flange plate substrate to form a lightweight upper bearing cover.
This achieves lightweighting of the upper bearing cover while meeting wear resistance requirements, reducing production costs, and improving connection strength and coaxiality.
Smart Images
Figure CN2025139611_30072026_PF_FP_ABST
Abstract
Description
A bearing cover for a rotary compressor pump body and its manufacturing method Cross-references to related applications
[0001] This application claims priority to Chinese Patent Application No. 202510121532.9, filed in China on January 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This invention relates to a rotary compressor pump body, and more particularly to an upper bearing cover for a rotary compressor pump body, and also to a method for manufacturing the aforementioned upper bearing cover. Background Technology
[0003] Rotary refrigeration compressors are widely used in household and similar air conditioners due to their high refrigeration efficiency, compact structure, and small size.
[0004] The compressor pump body is an important component of a rotary refrigeration compressor, mainly composed of a cylinder block, piston, vane, crankshaft, upper bearing cover, and lower bearing cover. The upper bearing cover is usually made of cast iron or metallurgical parts, which results in a large weight of the upper bearing cover, which in turn leads to a large weight and rotational inertia of the entire compressor pump body.
[0005] However, replacing the upper bearing cover with a low-density material will greatly reduce the weight and rotational inertia of the whole machine, but the low-density material cannot meet the requirements for wear resistance.
[0006] In summary, achieving a lightweight design for the upper bearing cap while meeting the requirements for wear resistance has become an urgent problem for researchers in this field. Summary of the Invention
[0007] The technical problem to be solved by this invention is: how to achieve lightweighting of the upper bearing cover while meeting the requirements of wear resistance;
[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:
[0009] The present invention is an upper bearing cover for a rotor compressor pump body, including an upper bushing and an upper flange plate, wherein the upper bearing cover is composed of inserts and lightweight materials.
[0010] Furthermore, the insert is a bushing insert constituting the upper bushing and / or an exhaust hole insert, and the lightweight material is an aluminum alloy, magnesium alloy, titanium alloy, or engineering plastic, and the lightweight material constitutes the flange plate base.
[0011] Furthermore, the insert is made of cast iron, cast steel, or metal profile.
[0012] Furthermore, the upper bearing cover is integrally injection-molded or die-cast from the insert and lightweight material.
[0013] Furthermore, the lower outer peripheral wall of the bushing insert is provided with multiple circumferential grooves at the junction with the flange plate base, and circumferential protrusions are provided in the grooves.
[0014] Furthermore, the raised outer surface is provided with multiple vertical textures.
[0015] Furthermore, the exhaust port insert has an exhaust port that is connected to the compression chamber inside the cylinder.
[0016] Furthermore, the exhaust port insert has an exhaust port that is connected to the compression chamber inside the cylinder.
[0017] Furthermore, the vent insert has an arcuate surface that fits into the bushing insert.
[0018] A method for manufacturing an upper bearing cover for a rotor compressor pump body, characterized by comprising the following steps: (1) making an injection or die-casting mold for the upper bearing cover; (2) making a bushing insert and / or an exhaust hole insert; (3) placing and fixing the bushing insert and the exhaust hole insert in the mold; (4) injecting or pressing a lightweight material as a base material into the mold, cooling and forming it, and then removing it to obtain an upper bearing cover containing the insert.
[0019] The beneficial effects of this invention are as follows: This invention is an upper bearing cover for a rotor compressor pump body. A bushing insert and an exhaust port insert are formed from lightweight material through injection or die casting. The inserts utilize materials found in existing technologies. The bushing insert ensures the wear resistance of the upper bearing cover. The exhaust port insert and the external exhaust pipe also meet the requirements for coaxiality and a certain connection strength. The lightweight flange base reduces the overall weight of the upper bearing cover. Furthermore, this invention reduces the overall production cost of the upper bearing cover and is also beneficial for energy conservation and environmental protection. Attached Figure Description
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0021] Figure 1 is a schematic diagram of the structure of a conventional rotary compressor pump body;
[0022] Figure 2 is a vertical cross-sectional view of the upper bearing cover of the present invention;
[0023] Figure 3 is a cross-sectional view of the bushing insert of the present invention;
[0024] Figure 4 is a horizontal cross-sectional view of the upper bearing cover of the present invention;
[0025] Figure 5 is a cross-sectional view of the exhaust hole insert of the present invention;
[0026] Figure 6 is a side view of the exhaust port insert of the present invention. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.
[0028] The existing rotary compressor pump body is shown in Figure 1. The compressor pump body includes a cylinder 11, a crankshaft 2 having a long shaft 21, an eccentric portion 22, and a short shaft 23, an upper bearing cover 4 located at the top of the cylinder 11, and a lower bearing cover 5 located at the bottom of the cylinder 11. The eccentric portion 22 of the crankshaft 2 is located inside the cylinder 11, and a piston 3 is sleeved on the eccentric portion 22. The upper bearing cover 4 is composed of an upper bushing 41 and an upper flange plate 42, and is generally made of cast iron or cast steel blanks and then machined, or made of suitable metal profiles. An exhaust hole 421 (not shown) is opened on the upper flange plate 42. The exhaust port 421 is connected to the external exhaust pipe; the lower bearing cover 5 is composed of a lower bushing 51 and a lower flange plate 52, and is generally made of cast iron or cast steel blanks and then machined, or made of suitable metal profiles; the long shaft 21 of the crankshaft 2 is located in the upper shaft hole of the upper bushing 41, and the short shaft 23 of the crankshaft 2 is located in the lower shaft hole of the lower bushing 51; the inner peripheral wall of the cylinder block 11 is provided with an intake part (not shown) for intake, which is connected to the intake pipe; and a sliding vane slot seat is provided, in which a sliding vane 8 is provided, and the end of the sliding vane 8 is sealed to the piston 3.
[0029] The upper bearing cover of the present invention is shown in Figures 2 and 4; Figure 2 is a vertical cross-sectional view of the upper bearing cover of the present invention, and Figure 4 is a horizontal cross-sectional view of the upper bearing cover of the present invention. The upper bearing cover 4 of the present invention has the same structural shape as the upper bearing cover of the prior art, and is also composed of two parts: an upper bushing 41 and an upper flange plate 42. The difference is that the upper bushing 41 is composed of a bushing insert 2-41 embedded in the flange plate base 1-42, while the upper flange plate 42 is composed of the flange plate base 1-42 and an exhaust hole insert 2-43 embedded in the flange plate base 1-42. In a preferred embodiment of the present invention, the bushing insert 2-41 and the exhaust hole insert 2-43 are made of the same material as the upper bearing cover of the prior art. The flange plate base 1-42 is made of lightweight materials such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic. In this way, the bushing insert 2-41 and the long axis 21 of the crankshaft 2 can meet the requirements of wear resistance, and the exhaust hole insert 2-43 and the exhaust pipe can also meet the requirements of coaxiality and certain connection strength. The flange plate base 1-42, which is made of lightweight material, can meet the requirements of lightweight design of the upper bearing cover.
[0030] Figure 3 is a cross-sectional view of the bushing insert of the present invention, showing the general structure of the bushing insert 2-41. The bushing insert 2-41 is a hollow cylindrical structure. The part of the lower outer peripheral wall of the bushing insert 2-41 that connects with the flange plate base 1-42 is provided with a circumferential upper shaft hole annular groove 45 and an upper shaft hole protrusion 46 located between the annular grooves 45. There are at least two upper shaft hole annular grooves 45. The outer surface of the upper shaft hole protrusion 46 is also provided with multiple vertical textures. The hollow part of the bushing insert forms an upper shaft hole portion 411. The long shaft 21 of the crankshaft 2 passes through the upper shaft hole portion 411 and generates relative friction with the inner wall of the upper shaft hole portion 411.
[0031] Referring to Figures 4, 5, and 6, the vent insert will be described in detail below. Figure 4 is a horizontal sectional view of the upper bearing cover of the present invention, Figure 5 is a sectional view of the vent insert of the present invention, and Figure 6 is a side view of the vent insert of the present invention. The vent insert 2-43 is a thin, finger-shaped piece with the same thickness as the flange base 1-42 of the upper bearing cover. The vent insert 2-43 has a vent hole 421. In a preferred embodiment of the present invention, the vent insert 2-43 does not have a vent hole 421. The vent hole 421 can be formed after the upper bearing cover has been injection-molded or die-cast. In another preferred embodiment, the left side of the vent insert 2-43 has an arc-shaped surface 44 to ensure the positioning of the vent insert 2-43 and the bushing insert 2-41 during injection-molding or die-casting. As shown in Figure 4, the vent insert 2-43 has an arc-shaped surface 44 on its side that fits against the outer wall of the bushing insert 2-41. In another preferred embodiment, in order to ensure the connection strength between the flange plate base 1-42 and the vent hole insert 2-43, a groove 47 is provided on the outer wall of the vent hole insert 2-43, and the groove 47 is opened along the outer contour of the vent hole insert 2-43.
[0032] The present invention also provides a method for manufacturing an upper bearing cover; first, an injection or die-casting mold for the upper bearing cover as shown in Figures 2 and 4 is made; second, a bushing insert 2-41 as shown in Figure 3 and an vent insert 2-43 as shown in Figures 5 and 6 are made; third, the bushing insert 2-41 and the vent insert 2-43 are placed and fixed in the above mold; fourth, a lightweight material such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic is injected or pressed into the mold as a base material, cooled and formed, and then removed to obtain an upper bearing cover 4 containing the above inserts.
[0033] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An upper bearing cover for a rotary compressor pump body, comprising an upper bushing and an upper flange plate, characterized in that, The upper bearing cover is composed of an insert and a lightweight material; the insert is a bushing insert that forms the upper bushing and / or an exhaust port insert; the bushing insert contacts the crankshaft and / or the exhaust port insert is connected to the exhaust pipe; The bushing insert is a hollow cylindrical structure. The part of the lower outer peripheral wall of the bushing insert that connects to the flange plate base is provided with a circumferential upper shaft hole annular groove and an upper shaft hole protrusion located between the annular grooves. There are at least two upper shaft hole annular grooves, and the outer surface of the upper shaft hole protrusion is also provided with multiple vertical textures. The hollow part of the bushing insert forms the upper shaft hole portion, through which the long axis of the crankshaft passes and generates relative friction with the inner wall of the upper shaft hole portion. The vent insert is a thin, finger-shaped piece with the same thickness as the flange base of the upper bearing cover. The exhaust port insert has an exhaust port that is connected to the compression chamber inside the cylinder. The vent insert has an arcuate surface that fits into the bushing insert; A groove is provided on the outer wall of the vent insert, and the groove is opened along the outer contour of the vent insert.
2. The upper bearing cover of a rotary compressor pump body according to claim 1, characterized in that, The lightweight material is aluminum alloy, magnesium alloy, titanium alloy, or engineering plastic, and the lightweight material constitutes the flange plate base.
3. The upper bearing cover of a rotor compressor pump body according to claim 1, characterized in that, The insert is made of cast iron, cast steel or metal profile.
4. The upper bearing cover of a rotary compressor pump body according to claim 2, characterized in that, The upper bearing cover is integrally injection-molded or die-cast from the insert and lightweight material.
5. A method for manufacturing the upper bearing cover of a rotary compressor pump body as described in any one of claims 1-4, characterized in that, Includes the following steps: (1) Making injection or die-casting molds for the upper bearing cover; (2) Fabricate bushing inserts and / or venting hole inserts; (3) Place and fix the bushing insert and the vent hole insert in the above mold; (4) A lightweight material is injected or pressed into a mold as a base material, cooled and formed, and then removed to obtain an upper bearing cover containing the above-mentioned inserts.