Lower bearing cover of rotor type compressor pump body and manufacturing method

Abstract

The invention relates to a lower bearing cover of a rotor type compressor pump body and a manufacturing method, the lower bearing cover comprises a lower shaft sleeve and a lower flange plate, and the lower bearing cover is formed by compounding an insert and a light material; the inserts are end ring inserts and shaft sleeve inserts forming a lower shaft sleeve, the light materials are aluminum alloy or magnesium alloy or titanium alloy or engineering plastic, and the light materials form a flange plate base body. A shaft sleeve insert, an end ring insert and a light material are formed through injection or die casting, the inserts are made of materials in the prior art, the shaft sleeve insert guarantees the abrasion resistance of the lower bearing cover, the end ring insert guarantees the abrasion resistance requirement of friction between a piston and an eccentric part and the end ring insert, and the flange plate base body made of the light material can reduce the overall weight of the lower bearing cover. And meanwhile, the overall production cost of the lower bearing cover can be reduced, and energy conservation and environmental protection are facilitated.

Description

Technical Field

[0001] The invention relates to a rotor type compressor pump body, in particular to a lower bearing cover of a rotor type compressor pump body and a manufacturing method thereof. Background Art

[0002] Rotary refrigeration compressors are widely used in air conditioners for household and similar purposes due to their high refrigeration efficiency, compact structure and small size.

[0003] The compressor pump body is an important component of the rotary refrigeration compressor, which is mainly composed of a cylinder body, a piston, a vane, a crankshaft, an upper bearing cover and a lower bearing cover. The conventional lower bearing cover is a cast iron part or a metallurgical part, which leads to a large weight of the lower bearing cover, and then leads to a large weight and rotational inertia of the entire compressor pump body. However, replacing the lower bearing cover with a low-density material will greatly reduce the weight and rotational inertia of the entire machine, but the low-density material cannot meet the requirements of wear resistance; Since the compressor pump body is vertically floating, under the action of gravity, the lower surface of the eccentric shaft of the crankshaft and the lower surface of the piston will act on the lower bearing cover, and the upper surface of the lower bearing cover and the lower surface of the eccentric shaft and the piston will form a friction surface. If a low-density material is used here, it will accelerate wear; In summary, how to achieve a lightweight design of the lower bearing cover while meeting the requirements of wear resistance has become an urgent problem that researchers in this field need to solve. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to achieve a lightweight design of the lower bearing cover while meeting the requirements of wear resistance; In order to solve the above technical problems, the technical solution adopted by the present invention is: The present invention is a lower bearing cover of a rotor compressor pump body, comprising a lower shaft sleeve and a lower flange plate, and is characterized in that the lower bearing cover is composited by an inlay and a light material.

[0005] Furthermore, the lightweight material is aluminum alloy or magnesium alloy or titanium alloy or engineering plastic, and the lightweight material constitutes the flange plate matrix; the inlay is a sleeve inlay constituting the lower sleeve or, the inlay is an end ring inlay and a sleeve inlay constituting the lower sleeve.

[0006] Furthermore, the inlay is made of cast iron, cast steel or metal profile.

[0007] Furthermore, the lower bearing cover is formed by integrally injecting or die-casting the insert and the lightweight material.

[0008] Furthermore, a plurality of circumferential annular grooves are provided at the junction between the outer peripheral wall of the upper portion of the sleeve insert and the flange plate base, and a circumferential protrusion is provided in the annular groove.

[0009] Furthermore, the outer surface of the protrusion is provided with a plurality of vertical textures.

[0010] Furthermore, the end ring inlay is an annular thin sheet, a surface of which facing the flange plate substrate is provided with a plurality of blind holes, and the upper surface of the end ring inlay is flush with the upper surface of the flange plate substrate.

[0011] Furthermore, the blind hole is adapted to the coupling member.

[0012] Furthermore, the inner diameter of the end ring insert is greater than or equal to the outer diameter of the sleeve insert, and the blind hole has a thread or an annular groove.

[0013] Furthermore, the upper diameter of the end ring inlay is slightly smaller than the lower diameter.

[0014] The present invention also relates to a method for manufacturing a lower bearing cover of a rotor compressor pump body, comprising the following steps: (1) making an injection or die-casting mold for the lower bearing cover; (2) making an inlay; (3) placing and fixing the inlay in the mold; and (4) injecting or pressing a lightweight material as a base material into the mold, cooling and forming the material, and then taking it out to obtain a lower bearing cover containing the inlay.

[0015] Beneficial effects of the present invention: The present invention is a lower bearing cover of a rotor compressor pump body and a manufacturing method, in which a shaft sleeve inlay and a lightweight material are formed by injection or die-casting, and the inlay adopts the material in the prior art. The shaft sleeve inlay ensures the wear resistance of the lower bearing cover, and the flange plate substrate of the lightweight material can reduce the overall weight of the lower bearing cover; at the same time, the lower bearing cover of the present invention can also reduce the overall production cost of the lower bearing cover, and is also beneficial to energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of a rotor compressor pump body in the prior art; Figure 2 is a vertical cross-sectional view of the lower bearing cover of embodiment 1 of the present invention; Figure 3 1 is a schematic structural diagram of a shaft sleeve inlay in a lower bearing cap according to Embodiment 1 of the present invention; Figure 4 1 is a schematic structural diagram of the middle end ring inlay of the lower bearing cover according to Embodiment 1 of the present invention; Figure 5 is a vertical cross-sectional view of the lower bearing cover of embodiment 2 of the present invention; Figure 6 2 is a schematic structural diagram of a shaft sleeve inlay in a lower bearing cap according to Embodiment 2 of the present invention; Figure 7 2 is a schematic structural diagram of the middle end ring inlay of the lower bearing cover according to the second embodiment of the present invention; Figure 8 is a vertical cross-sectional view of the lower bearing cover of embodiment 3 of the present invention; Fig. 9 2 is a schematic structural diagram of a shaft sleeve inlay in a lower bearing cap according to Embodiment 3 of the present invention; Fig.10 2 is a schematic structural diagram of the middle end ring inlay of the lower bearing cover according to Embodiment 3 of the present invention; Fig.11 is a vertical cross-sectional view of the lower bearing cover of embodiment 4 of the present invention; Fig.12 is a horizontal cross-sectional view of the lower bearing cover of embodiment 4 of the present invention; Fig.13 It is a cross-sectional view of the shaft sleeve insert of embodiment 4 of the present invention. DETAILED DESCRIPTION

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] The rotor compressor pump body of the prior art is as follows Figure 1 As shown, the compressor pump body includes a cylinder body 11, a crankshaft 2 having a long axis 21, an eccentric portion 22 and a short axis 23, an upper bearing cover 4 arranged on the top of the cylinder body 11, and a lower bearing cover 5 arranged on the bottom of the cylinder body 11; the eccentric portion 22 of the crankshaft 2 is located in the cylinder body 11, and a piston 3 is arranged on the outer sleeve of the eccentric portion 22; the upper bearing cover 4 is composed of an upper sleeve 41 and an upper flange plate 42, which is generally made of a cast iron or cast steel material and then machined, or made of a suitable metal The lower bearing cover 5 is composed of a lower sleeve 51 and a lower flange plate 52, which is generally machined from a cast iron or cast steel blank, or machined from a suitable metal profile; the long axis 21 of the crankshaft 2 is located in the upper shaft hole of the upper sleeve 41, and the short axis 23 of the crankshaft 2 is located in the lower shaft hole of the lower sleeve 51; and a slide groove seat is provided, in which a slide 8 is arranged, and the end of the slide 8 is sealed with the piston 3. Example 1

[0020] Refer to the following Figure 2 , Figure 3 , Figure 4 The lower bearing cover of embodiment 1 of the present invention is described in detail. Figure 2 is a vertical cross-sectional view of the lower bearing cover in Embodiment 1 of the present invention, Figure 3 is a vertical cross-sectional view of the shaft sleeve insert in Example 1 of the present invention, Figure 41 is a cross-sectional view of the end ring inlay in Example 1 of the present invention. The lower bearing cover 5 in Example 1 of the present invention has the same structure and appearance as the lower bearing cover in the prior art, and is also composed of a lower sleeve 51 and a lower flange plate 52. The difference is that the lower sleeve 51 is composed of a sleeve inlay 2-51 inlaid in a flange plate base 1-52, and the lower flange plate 52 is composed of a flange plate base 1-52 and an end ring inlay 2-53 inlaid in the flange plate base 1-52. The end ring inlay 2-53 is concentrically arranged with the flange plate base 1-52, and the flange plate The upper surface of the base 1-52 is flush with the upper surface of the end ring insert 2-53 in the horizontal direction, the inner diameter of the end ring insert 2-53 is larger than the outer diameter of the sleeve insert 2-51, and the lower surface of the end ring insert 2-53 is provided with a blind hole 57, which can be adapted to a coupling member 54 such as a screw through a thread; by providing a raised coupling member 54 on the lower surface of the end ring insert 2-53, the bonding force between the end ring insert 2-53 and the flange plate base 1-52 can be increased. The sleeve inlay 2-51 and the end ring inlay 2-53 are made of the same material as the lower bearing cover 5 in the prior art, and the flange plate base 1-52 is made of lightweight materials such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastics. In this way, the sleeve inlay 2-51 and the short shaft 23 of the crankshaft 2 can meet the wear resistance requirements, and the upper surface of the end ring inlay 2-53 can also meet the wear resistance requirements of friction with the lower surface of the piston 3 and the eccentric shaft 22. The flange plate base 1-52 made of lightweight materials can meet the requirements of lightweight design of the lower bearing cover.

[0021] In a preferred embodiment, Figure 2 and Figure 4 The upper diameter of the end ring insert 2-53 shown is slightly smaller than the lower diameter, that is, its outer wall is inclined, which can also increase the bonding force between the end ring insert 2-53 and the flange plate base 1-52.

[0022] Figure 3It is a cross-sectional view of the shaft sleeve inlay of Example 1 of the present invention, which shows the general structure of the shaft sleeve inlay 2-51 of Example 1 of the present invention. The shaft sleeve inlay 2-51 is a hollow cylindrical structure. The portion of the outer peripheral wall of the upper part of the shaft sleeve inlay 2-51 connected to the flange plate base 1-52 is provided with a circumferential lower shaft hole annular groove 54 and a lower shaft hole protrusion 55 located between the annular groove 54. There are at least two lower shaft hole annular grooves 54, and the outer surface of the lower shaft hole protrusion 55 is also provided with a plurality of vertical textures; during injection or die-casting, a lightweight material such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic is used as a base material to be combined with the lower shaft hole protrusion 55 and the annular groove 54 of the shaft sleeve inlay 2-51 to avoid axial movement of the shaft sleeve inlay 2-51 and the flange plate base 1-52; vertical textures are provided, and the base material is combined with the textures to avoid circumferential rotation of the shaft sleeve inlay 2-51 and the flange plate base 1-52. The hollow portion of the sleeve insert forms a shaft hole portion 511 , and the short shaft 23 of the crankshaft 2 passes through the shaft hole portion 511 and generates relative friction with the inner wall of the shaft hole portion 511 .

[0023] This embodiment also provides a method for manufacturing a lower bearing cover. First, make Figure 1 , 2 The injection or die-casting mold of the lower bearing cover shown in FIG. Figure 3 The sleeve insert 2-51 shown in FIG. Figure 2 , 4 The end ring inlay 2-53 shown; third, the sleeve inlay 2-51 and the end ring inlay 2-53 are placed and fixed in the above-mentioned 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 matrix material, and taken out after cooling and forming, so as to obtain the lower bearing cover 5 containing the above-mentioned inlay. Example 2

[0024] Refer to the following Figure 5 , Figure 6 , Figure 7 The lower bearing cover of embodiment 2 of the present invention is described in detail. Figure 5 is a vertical cross-sectional view of the lower bearing cover in Embodiment 2 of the present invention, Figure 6 is a vertical cross-sectional view of the shaft sleeve insert in Example 2 of the present invention, Figure 7: is a cross-sectional view of the end ring inlay in Example 2 of the present invention. The lower bearing cover 5 in Example 2 of the present invention has the same structure and appearance as the lower bearing cover in the prior art, and is also composed of a lower sleeve 51 and a lower flange plate 52. The difference is that the lower sleeve 51 is composed of a sleeve inlay 2-51 inlaid in the flange plate base 1-52, and the lower flange plate 52 is composed of a flange plate base 1-52 and an end ring inlay 2-53 inlaid in the flange plate base 1-52. The end ring inlay 2-53 is concentrically arranged with the flange plate base 1-52, and the upper surface of the flange plate base 1-52 is flush with the upper surface of the end ring inlay 2-53 in the horizontal direction. The inner diameter of the inlay 2-53 is larger than the outer diameter of the sleeve inlay 2-51; the sleeve inlay 2-51 and the end ring inlay 2-53 are made of the same material as the lower bearing cover 5 of the prior art, and the flange plate base 1-52 is made of lightweight materials such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastics, so that the wear resistance requirements between the sleeve inlay 2-51 and the short shaft 23 of the crankshaft 2 can be met, and the upper surface of the end ring inlay 2-53 meets the hardness requirements of friction with the lower surface of the piston 3 and the eccentric shaft 22. The flange plate base 1-52 made of lightweight materials can meet the requirements of lightweight design of the lower bearing cover.

[0025] In a preferred embodiment, the end ring inlay 2-53 in this embodiment may also have the same Figure 4 The blind hole 57 shown in the figure has a thread or annular groove in the blind hole 57, thereby increasing the bonding force between the end ring insert 2-53 and the flange plate substrate 1-52; in another preferred embodiment, as Figure 5 and Figure 7 The upper diameter of the end ring insert 2-53 shown is slightly smaller than the lower diameter, that is, its outer wall is inclined, which can also increase the bonding force between the end ring insert 2-53 and the flange plate base 1-52.

[0026] Figure 6 It is a cross-sectional view of the shaft sleeve insert of Example 2 of the present invention, which shows the general structure of the shaft sleeve insert 2-51 of Example 2 of the present invention. The shaft sleeve insert 2-51 is a hollow cylindrical structure. The portion of the outer peripheral wall of the upper part of the shaft sleeve insert 2-51 connected to the flange plate base 1-52 is provided with a circumferential lower shaft hole annular groove 54 and a lower shaft hole protrusion 55 located between the annular groove 54. There are at least two lower shaft hole annular grooves 54, and the outer surface of the lower shaft hole protrusion 55 is also provided with a plurality of vertical textures; during injection or die-casting, a lightweight material such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic is used as a base material to be combined with the lower shaft hole protrusion 55 and the annular groove 54 of the shaft sleeve insert 2-51 to avoid axial movement of the shaft sleeve insert 2-51 and the flange plate base 1-52; vertical textures are provided, and the base material is combined with the textures to avoid circumferential rotation of the shaft sleeve insert 2-51 and the flange plate base 1-52.

[0027] The hollow portion of the sleeve insert forms a shaft hole portion 511 , and the short shaft 23 of the crankshaft 2 passes through the shaft hole portion 511 and generates relative friction with the inner wall of the shaft hole portion 511 .

[0028] This embodiment also provides a method for manufacturing a lower bearing cover. First, make Figure 1 , 5 The injection or die-casting mold of the lower bearing cover shown in FIG. Figure 6 The sleeve insert 2-51 shown in FIG. Figure 2 , 7 The end ring inlay 2-53 shown; third, the sleeve inlay 2-51 and the end ring inlay 2-53 are placed and fixed in the above-mentioned 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 matrix material, and taken out after cooling and forming, so as to obtain the lower bearing cover 5 containing the above-mentioned inlay. Example 3

[0029] Refer to the following Figure 8 , Fig. 9 , Fig.10 The lower bearing cover of embodiment 3 of the present invention is described in detail. Figure 8 is a vertical cross-sectional view of the lower bearing cover in Embodiment 3 of the present invention, Fig. 9 is a vertical cross-sectional view of the shaft sleeve insert in Example 3 of the present invention, Fig.10 It is a cross-sectional view of the end ring inlay in Example 3 of the present invention. The lower bearing cover 5 in Example 3 of the present invention has the same structure and appearance as the lower bearing cover in the prior art, and is also composed of a lower sleeve 51 and a lower flange plate 52. The difference is that the lower sleeve 51 is composed of a sleeve inlay 2-51 inlaid in a flange plate substrate 1-52, and the lower flange plate 52 is composed of a flange plate substrate 1-52 and an end ring inlay 2-53 inlaid in the flange plate substrate 1-52. The end ring inlay 2-53 is concentrically arranged with the flange plate substrate 1-52, and the upper surface of the flange plate substrate 1-52 is flush with the upper surface of the end ring inlay 2-53 in the horizontal direction. The inner diameter of the end ring inlay 2-53 is equal to the outer diameter of the sleeve inlay 2-51 at the step groove 56, and the end ring inlay 2-53 is supported on the step groove 56 near the inner diameter. The sleeve inlay 2-51 and the end ring inlay 2-53 are made of the same material as the lower bearing cover 5 in the prior art, and the flange plate base 1-52 is made of lightweight materials such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastics. In this way, the sleeve inlay 2-51 and the short shaft 23 of the crankshaft 2 can meet the wear resistance requirements, and the upper surface of the end ring inlay 2-53 meets the wear resistance requirements of friction with the lower surface of the piston 3 and the eccentric shaft 22. The flange plate base 1-52 made of lightweight materials can meet the requirements of lightweight design of the lower bearing cover.

[0030] In a preferred embodiment, the end ring inlay 2-53 in this embodiment may also have the same Figure 4 The blind hole 57 shown in the figure has a thread or annular groove in the blind hole 57, thereby increasing the bonding force between the end ring insert 2-53 and the flange plate substrate 1-52; in another preferred embodiment, as Figure 5 and Figure 7 The upper diameter of the end ring insert 2-53 shown is slightly smaller than the lower diameter, that is, its outer wall is inclined, which can also increase the bonding force between the end ring insert 2-53 and the flange plate base 1-52.

[0031] Fig. 9 It is a cross-sectional view of the shaft sleeve insert of Example 3 of the present invention, which shows the general structure of the shaft sleeve insert 2-51 of Example 3 of the present invention. The shaft sleeve insert 2-51 is a hollow cylindrical structure. The portion of the outer peripheral wall of the upper part of the shaft sleeve insert 2-51 connected to the flange plate base 1-52 is provided with a circumferential lower shaft hole annular groove 54 and a lower shaft hole protrusion 55 located between the annular groove 54. There is at least one lower shaft hole annular groove 54, and the outer surface of the lower shaft hole protrusion 55 is also provided with a plurality of vertical textures; during injection or die-casting, a lightweight material such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic is used as a base material to be combined with the lower shaft hole protrusion 55 and the annular groove 54 of the shaft sleeve insert 2-51 to avoid axial movement of the shaft sleeve insert 2-51 and the flange plate base 1-52; vertical texture is provided, and the base material is combined with the texture to avoid circumferential rotation of the shaft sleeve insert 2-51 and the flange plate base 1-52. The hollow portion of the sleeve insert forms a shaft hole portion 511 , and the short shaft 23 of the crankshaft 2 passes through the shaft hole portion 511 and generates relative friction with the inner wall of the shaft hole portion 511 .

[0032] This embodiment also provides a method for manufacturing a lower bearing cover. First, make Figure 1 , 8 The injection or die-casting mold of the lower bearing cover shown in FIG. Fig. 9 The sleeve insert 2-51 shown in FIG. Figure 8 , 10 The end ring inlay 2-53 shown; third, the sleeve inlay 2-51 and the end ring inlay 2-53 are placed and fixed in the above-mentioned 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 matrix material, and taken out after cooling and forming, so as to obtain the lower bearing cover 5 containing the above-mentioned inlay. Example 4

[0033] In this embodiment, the lower bearing cover is as follows Fig.11 , Fig.12 As shown; Fig.11 is a vertical cross-sectional view of the lower bearing cover of Embodiment 4, Fig.12It is a horizontal cross-sectional view of the lower bearing cover of Example 4. The lower bearing cover in Example 4 has the same structural appearance as the lower bearing cover of the prior art, and is also composed of a lower sleeve and a lower flange plate. The difference is that the lower sleeve is composed of a sleeve insert 2-51 embedded in a flange plate substrate 1-52, and the lower flange plate is composed of a flange plate substrate 1-52. In a preferred embodiment of the present invention, the sleeve insert 2-51 is made of the same material as the lower bearing cover of the prior art, and the flange plate substrate 1-52 is made of a lightweight material such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic, so that the sleeve insert 2-51 and the short shaft 23 of the crankshaft 2 can meet the wear resistance requirements, and the flange plate substrate 1-52 composed of a lightweight material can meet the requirements of lightweight design of the lower bearing cover.

[0034] Fig.13 is a cross-sectional view of the sleeve insert in Example 4, which shows the general structure of the sleeve insert 2-51 of the present invention, and its structure is similar to Figure 3 The structure is roughly the same. The sleeve insert 2-51 is a hollow cylindrical structure. The portion of the outer peripheral wall of the upper part of the sleeve insert 2-51 connected to the flange plate base 1-52 is provided with a circumferential lower shaft hole annular groove 54 and a lower shaft hole protrusion 55 located between the annular grooves 54. There are at least two lower shaft hole annular grooves 54, and the outer surface of the lower shaft hole protrusion 55 is also provided with a plurality of vertical textures. During injection or die-casting, a lightweight material such as aluminum alloy, magnesium alloy, titanium alloy or engineering plastic is used as a base material to combine with the lower shaft hole protrusion 55 and the annular groove 54 of the sleeve insert 2-51 to avoid axial movement of the sleeve insert 2-51 and the flange plate base 1-52. Vertical textures are provided, and the base material is combined with the textures to avoid circumferential rotation of the sleeve insert 2-51 and the flange plate base 1-52.

[0035] The hollow portion of the sleeve insert forms a shaft hole portion 511 , and the short shaft 23 of the crankshaft 2 passes through the shaft hole portion 511 and generates relative friction with the inner wall of the shaft hole portion 511 .

[0036] The present invention also provides a method for manufacturing a lower bearing cover. First, a lower bearing cover is manufactured as follows: Fig.11 , 12 The injection or die-casting mold of the lower bearing cover shown in FIG. Fig.13 The shaft sleeve insert 2-51 shown; third, the shaft sleeve insert 2-51 is placed and fixed in the above-mentioned 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 matrix material, and taken out after cooling and forming, so as to obtain the lower bearing cover 5 containing the above-mentioned insert.

[0037] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A lower bearing cover of a rotor compressor pump body, comprising a lower sleeve and a lower flange plate, characterized in that: The lower bearing cover is composited by an insert and a light material.

2. The lower bearing cover of a rotor 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 matrix; The inlay is a sleeve inlay constituting the lower sleeve or, The inlays are end ring inlays and shaft sleeve inlays constituting the lower shaft sleeve.

3. The lower bearing cover of a rotor compressor pump body according to claim 1, characterized in that: The inlay is made of cast iron, cast steel or metal profile.

4. The lower bearing cover of a rotor compressor pump body according to claim 1, characterized in that: The lower bearing cover is formed by integrally injecting or die-casting the insert and the lightweight material.

5. The lower bearing cover of a rotor compressor pump body according to claim 2, characterized in that: A plurality of circumferential annular grooves are arranged at the joint between the outer peripheral wall of the upper part of the sleeve insert and the flange plate base, and a circumferential protrusion is arranged in the annular groove.

6. The lower bearing cover of a rotor compressor pump body according to claim 5, characterized in that: The outer surface of the protrusion is provided with a plurality of vertical textures.

7. The lower bearing cover of a rotor compressor pump body according to claim 2, characterized in that: The end ring inlay is an annular thin sheet, and a plurality of blind holes are provided on the surface thereof facing the flange plate substrate. The upper surface of the end ring inlay is flush with the upper surface of the flange plate substrate.

8. The lower bearing cover of a rotor compressor pump body according to claim 7, characterized in that: The blind hole is matched with the coupling piece.

9. The lower bearing cover of a rotor compressor pump body according to claim 7, characterized in that: The inner diameter of the end ring insert is greater than or equal to the outer diameter of the sleeve insert, and the blind hole has a thread or an annular groove.

10. The lower bearing cover of a rotor compressor pump body according to claim 7, characterized in that: The upper diameter of the end ring insert is slightly smaller than the lower diameter.

11. A method for manufacturing a lower bearing cover of a rotor compressor pump body according to any one of claims 1 to 10, characterized in that: The steps include: (1) Making the injection or die-casting mold for the lower bearing cover; (2) Making inlays; (3) placing and fixing the inlay in the mold; (4) A lightweight material is injected or pressed into a mold as a base material, and after cooling and forming, it is taken out to obtain a lower bearing cover containing the above-mentioned insert.

Images