Rotary compressor pump body and manufacturing method

Abstract

A rotary compressor pump body and a manufacturing method. The rotary compressor pump body comprises: a cylinder body (11), wherein the cylinder body (11) is internally provided with a compression cavity, and the inner peripheral wall of the cylinder body is radially provided with a vane seat (7) for accommodating a vane, and a suction seat (6); a crankshaft (2); a piston (3); an upper bearing cover (4); and a lower bearing cover (5). At least one of the cylinder body (11), the upper bearing cover (4), and the lower bearing cover (5) is a composite component formed from an insert and a lightweight material. By injection molding or die-casting the insert made of the same material as that used in the prior art, together with the lightweight material, the insert is in contact with the crankshaft or the piston or the vane, thereby ensuring the wear resistance of the pump body, and also ensuring the light weight of the compressor pump body. In addition, the composite component formed by bonding the insert and a base body can reduce costs and is also conducive to energy saving and environmental protection. The insert can be produced and processed in a large scale.

Description

A rotary compressor pump body and its manufacturing method Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202510121535.2, filed in China on January 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of compressor technology, and in particular to a rotary compressor pump body and its manufacturing method. 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. It mainly consists of a cylinder, piston, vane, crankshaft, upper bearing cover, and lower bearing cover. The upper bearing cover, piston, and lower bearing cover are sequentially fitted onto the crankshaft along its axial direction, forming a dynamic seal with the cylinder and dividing the inside of the cylinder into two chambers: a high-pressure chamber and a low-pressure chamber. The tail end of the vane presses its end face tightly against the outer peripheral wall of the piston, dividing the space into an intake chamber and a compression chamber. Driven by the crankshaft, the intake, compression, and exhaust processes are completed.

[0005] Currently, most components of the compressor pump body are made of cast iron or metallurgical parts, and the existing components have the disadvantages of being heavy and having large rotational inertia.

[0006] Replacing cast iron or metallurgical parts with low-density materials will greatly reduce the weight and rotational inertia of the entire machine, thereby reducing vibration and noise and improving compressor performance; however, low-density materials often cannot meet strength requirements or wear resistance requirements for compressor use.

[0007] In summary, achieving lightweight design of compressor pump bodies while meeting the wear resistance requirements has become an urgent problem for researchers in this field. Summary of the Invention

[0008] The technical problem to be solved by this invention is: to achieve a lightweight design of the compressor pump body while satisfying the wear resistance of the compressor pump body;

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] This invention relates to a rotary compressor pump body, comprising: a cylinder body having a compression chamber inside, and a vane seat and a suction seat radially formed on the inner circumferential wall for accommodating vanes; a crankshaft composed of a long shaft portion, an eccentric shaft portion, and a short shaft portion; a piston; an upper bearing cap disposed at the top of the cylinder body and having an upper bushing through which the long shaft portion of the crankshaft passes; and a lower bearing cap disposed at the bottom of the cylinder body and having a lower bushing through which the short shaft portion of the crankshaft passes; the upper bearing cap, piston, and lower bearing cap are sequentially sleeved on the crankshaft along the axial direction of the crankshaft, forming a dynamic seal with the cylinder body; at least one of the cylinder body, upper bearing cap, and lower bearing cap is composed of an insert and a lightweight material.

[0011] Furthermore, when there are multiple cylinders arranged vertically, a partition is provided between the cylinders.

[0012] Furthermore, the upper bearing cover includes the upper bushing and the upper flange plate; the insert is an upper shaft hole insert, and its external dimensions are consistent with those of the upper bushing.

[0013] Furthermore, the insert also includes an exhaust insert.

[0014] Furthermore, the upper bearing cover is integrally injection-molded or die-cast from a lightweight material, comprising an exhaust insert and an upper shaft hole insert. Furthermore, the exhaust insert has an arc-shaped surface on its side that conforms to the outer wall of the upper shaft hole insert.

[0015] Furthermore, the lower bearing cover includes a lower bushing and a lower flange plate; the insert is a lower shaft hole insert, and its external dimensions are consistent with those of the lower bushing.

[0016] Furthermore, the lower bearing cover is integrally injection-molded or die-cast from the lower shaft hole insert and a lightweight material.

[0017] Furthermore, the insert is a slider seat insert and / or an air intake seat insert.

[0018] Furthermore, when the insert in the cylinder is a slide block insert, the slide block insert has a slide block seat that moves relative to the end of the slide block.

[0019] Furthermore, when the insert in the cylinder is a hollow intake seat insert, the intake seat insert has a through intake seat, and the intake seat is connected to the compression chamber inside the cylinder.

[0020] Furthermore, when the inserts in the cylinder body are a sliding vane insert and an intake insert, the intake insert has an inclined surface that fits against one side of the outer wall of the sliding vane insert. The axis of the intake insert intersects the center line of the sliding vane insert at a point, which is the center of the cross-section of the compression chamber of the cylinder body.

[0021] Furthermore, the cylinder body is integrally injection-molded or die-cast from the intake seat insert, the slide plate insert, and a lightweight material.

[0022] Furthermore, the insert is made of cast iron, cast steel, or other metallurgical profiles.

[0023] Furthermore, the lightweight material is aluminum alloy, magnesium alloy, titanium alloy, or engineering plastic.

[0024] Furthermore, the outer peripheral wall of the upper shaft hole insert is provided with an upper shaft hole annular groove, and an upper shaft hole protrusion is provided in the upper shaft hole annular groove.

[0025] Furthermore, the outer peripheral wall of the lower shaft hole insert is provided with a lower shaft hole annular groove, and a lower shaft hole protrusion is provided in the lower shaft hole annular groove.

[0026] Furthermore, the two sides of the slide block insert are provided with intersecting grooves.

[0027] Furthermore, the axial outer peripheral wall of the air intake seat insert is provided with a circumferential groove and a circumferential protrusion.

[0028] The present invention also relates to a method for manufacturing a rotary compressor pump body, characterized by comprising the following steps

[0029] (1) Injection or die casting molds for making upper bearing caps, cylinder bodies or lower bearing caps;

[0030] (2) Make the upper shaft hole insert, exhaust insert, slide block insert, intake block insert or lower shaft hole insert;

[0031] (3) Place and fix the above-mentioned inserts in the corresponding molds;

[0032] (4) Lightweight material is injected or pressed into the mold as the base material, cooled and formed, and then removed to obtain the upper bearing cover, cylinder body or lower bearing cover containing the above-mentioned inserts.

[0033] (5) Assemble the upper bearing cover, cylinder body or lower bearing cover containing the above-mentioned inserts with the crankshaft and piston in sequence to form the rotor compressor pump body.

[0034] The beneficial effects of this invention are as follows: This invention relates to a rotary compressor pump body. By injection molding or die casting a lightweight material with an insert of the same material as in the prior art, the insert contacts the crankshaft, piston, or vane, ensuring both the wear resistance of the pump body and its lightweight design. Furthermore, the composite component formed by combining the insert and the base material reduces costs and promotes energy conservation and environmental protection compared to conventional casting of cast iron or steel parts or production using other metallurgical materials. For components such as the vane seat, exhaust components, upper shaft hole of the upper bearing cover, and lower shaft hole of the lower bearing cover in the cylinder block, existing technologies require processing one piece at a time. However, for inserts, such as the vane seat insert, more than ten or even twenty pieces can be processed at once, enabling large-scale production, improving production efficiency, and ensuring consistent product quality. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 is a schematic diagram of the structure of the single-cylinder compressor pump body of the present invention;

[0037] Figure 2 is a schematic diagram of the structure of the twin-cylinder compressor pump body of the present invention.

[0038] Figure 3 is a horizontal cross-sectional view of the upper bearing cover of the present invention;

[0039] Figure 4 is a vertical cross-sectional view of the upper bearing cover of the present invention;

[0040] Figure 5 is a schematic diagram of the structure of the upper shaft hole insert in the upper bearing cover of the present invention;

[0041] Figure 6 is a schematic diagram of the structure of the venting part in the upper bearing cover of the present invention;

[0042] Figure 7 is a schematic diagram of the structure of another type of venting insert in the upper bearing cover of the present invention;

[0043] Figure 8 is a schematic diagram of the annular cylinder body of the present invention having an intake seat insert and a sliding plate seat insert;

[0044] Figures 9, 10, and 11 are the right view, front view, and left view of the slide block insert of the present invention, respectively.

[0045] Figure 12 is a structural schematic diagram of the air intake seat insert of the present invention;

[0046] Figures 13, 14, 15, and 16 are the right view, front view, vertical sectional view, and left view of another sliding plate holder insert of the present invention.

[0047] Figure 17 is a schematic diagram of the annular structure cylinder body of the present invention, which has an integral insert with an intake seat and a sliding plate seat.

[0048] Figure 18 is a schematic diagram of another annular cylinder body with an integral insert having an intake seat and a sliding plate seat according to the present invention.

[0049] Figures 19, 20, and 21 are the right view, front view, and left view of the integrated insert of the suction seat and the slide plate seat of the present invention;

[0050] Figures 22, 23, 24, and 25 are the right view, front view, sectional view, and left view of another integrated insert of the suction seat and the slide seat according to the present invention.

[0051] Figure 26 is a horizontal cross-sectional view of the lower bearing cover of the present invention;

[0052] Figure 27 is a vertical cross-sectional view of the lower bearing cover of the present invention;

[0053] Figure 28 is a structural schematic diagram of the lower shaft hole insert of the present invention;

[0054] Figures 29 and 30 are schematic diagrams of a single-protrusion cylinder structure containing the insert of the present invention.

[0055] Figures 31 and 32 are schematic diagrams of a double-protruding cylinder structure containing the insert of the present invention.

[0056] Figure 33 is a schematic diagram of the compressor pump body structure in the prior art. Detailed Implementation

[0057] 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.

[0058] As shown in Figure 33, the compressor pump body of the prior art includes a cylinder body 11, an eccentric shaft 22 of a crankshaft 2 located inside the cylinder body 11, a piston 3 sleeved on the eccentric shaft 22, an upper bearing cover 4 at the top of the cylinder body 11, the upper bearing cover 4 being composed of an upper bushing 41 and an upper flange plate 42, an exhaust section 421 (not shown) opened on the upper flange plate 42, the exhaust section 421 being connected to an external exhaust pipe, a lower bearing cover 5 at the bottom of the cylinder body 11, the lower bearing cover 5 being composed of a lower bushing 51 and a lower flange plate 52, the long shaft 21 of the crankshaft 2 being located in the upper shaft hole of the upper bushing 41, and the short shaft 23 of the crankshaft 2 being located in the lower shaft hole of the lower bushing 51; an intake seat 6 (not shown) for intake is opened on the inner peripheral wall of the cylinder body 11, the intake seat being connected to an intake pipe; and a vane seat 7 is opened, a vane 8 is provided in the vane seat, the end of the vane 8 being sealed to the piston 3.

[0059] The compressor pump body and its components of the present invention will now be described in detail with reference to the accompanying drawings.

[0060] As shown in FIG1, the compressor pump body and its components of the present invention are in frictional contact with the outer peripheral wall of the long shaft 21 in the conventional compressor pump body, the lower shaft hole 511 of the lower shaft 51 in frictional contact with the outer peripheral wall of the short shaft 23, the sliding vane 8 in frictional contact with the sliding vane seat 7, and the suction seat 6 requires an external intake pipe and the exhaust part 421 requires an external exhaust pipe.

[0061] To ensure the wear resistance of the upper shaft hole 411, the lower shaft hole 511, or the slide block 7, or to ensure the wear resistance and coaxial connection between the intake pipe and the intake seat 6, or to ensure the wear resistance and coaxial connection between the exhaust pipe and the exhaust section 421, the upper shaft hole 411 and the exhaust section 421 of the upper bearing cover 4, the lower shaft hole 511 of the lower bearing cover 5, and the slide block 7 and the intake seat 6 of the cylinder block 11 can be set as inserts made of materials different from the base material; the inserts are made of cast iron, cast steel, or other metallurgical materials, and these inserts can meet the requirements of wear resistance or coaxiality.

[0062] Figure 1 is a cross-sectional view of the pump body. The cylinder body 11 includes a cylinder body base 1-11, an intake seat insert (not shown) and a vane seat insert (not shown) are disposed inside the cylinder body base 1-11, and an eccentric shaft 22 of the crankshaft 2 is disposed inside the cylinder body 11; an upper bearing cover 4 is provided at the top of the cylinder body 11, the upper bearing cover 4 includes an upper shaft hole insert 2-41, an upper flange plate base 1-42, and an exhaust insert (not shown), and the long shaft 21 of the crankshaft 2 rubs against the inner wall of the upper shaft hole insert 2-41; a lower bearing cover 5 is provided at the bottom of the cylinder body 11, the lower bearing cover 5 includes a lower shaft hole insert 2-51 and a lower flange plate base 1-52, and the short shaft 23 of the crankshaft 2 rubs against the inner wall of the lower shaft hole insert 2-51.

[0063] Figure 3 is a horizontal cross-sectional view of the upper flange plate base 1-42 of the upper bearing cover 4, showing the position of the exhaust part insert 2-43 and the upper shaft hole insert 2-41 in the upper flange plate base 1-42. The exhaust part insert 2-43 is roughly curved in the shape of a finger, with the curved part facing the upper shaft hole insert 2-41.

[0064] Figure 4 is a vertical cross-sectional view of the upper flange plate base 1-42 of the upper bearing cover 4, showing the position of the upper shaft hole insert 2-41 in the upper flange plate base 1-42.

[0065] Figure 5 is a vertical cross-sectional view of the upper shaft hole insert 2-41. As shown in the figure, the upper shaft hole insert 2-41 is a hollow cylindrical component. The hollow part constitutes the upper shaft hole portion 411. The lower part of the insert, which contacts the upper flange plate base 1-42 of the upper bearing cover 4, is provided with a circumferential upper shaft hole annular groove 45 and an upper shaft hole protrusion 46. The function of the upper shaft hole annular groove 45 and the upper shaft hole protrusion 46 is to increase the bonding force between the upper flange plate base 1-42 and the upper flange plate base 1-42, and to prevent axial displacement between the upper flange plate base 1-42 and the upper shaft hole insert 2-41. Vertical textures (not shown) are provided on the outer surface of the upper shaft hole protrusion 46. The vertical textures also increase the bonding force between the upper flange plate base 1-42 and the upper flange plate base 1-42, and to prevent circumferential displacement between the upper flange plate base 1-42 and the upper shaft hole insert 2-41.

[0066] Figure 6 is a structural schematic diagram of the venting insert 2-43. As shown in the figure, the venting insert 2-43 has an venting part 421, which is perpendicular to the plane of the paper and extends through the venting insert 2-43. In order to ensure the positioning of the venting insert 2-43 and the upper shaft hole insert 2-41 during injection or die casting, in a preferred embodiment, the side of the venting insert 2-43 has an arc-shaped surface 44 that fits the outer wall of the upper shaft hole insert 2-41.

[0067] Figure 7 shows another type of exhaust insert of the present invention. After the exhaust insert 2-43 is injection-molded with the upper bearing cover base material, the exhaust part 421 as shown in Figure 6-1 can be machined by subsequent machining.

[0068] Figure 8 is a horizontal cross-sectional view of the intake seat insert and the slide plate seat insert in the annular cylinder block. The intake seat and the slide plate seat are set on the corresponding inserts.

[0069] Figures 9, 10, and 11 are the right view, front view, and left view of the slider holder insert; the slider holder insert 2-7 includes a slider holder 7 for accommodating the slider 8. The slider holder 7 has an opening that runs vertically through (perpendicular to the direction of the paper). On the outer surface of the slider holder insert 2-7, there are horizontal and vertical intersecting grooves 71. These grooves 71 are used to increase the bonding force between the slider holder insert 2-7 and the base material, ensuring a firm bond between the slider holder insert 2-7 and the cylinder base material. From the direction perpendicular to the paper, the left side of Figure 10 is an inclined surface, which forms a certain angle with the longitudinal centerline of the slider holder insert 2-7.

[0070] Figure 12 is a vertical cross-sectional view of the intake seat insert 2-6. The intake seat insert 2-6 is roughly a hollow cylindrical component, with the hollow part being the intake seat 6. The outer circumference of the cylindrical component is provided with a circumferential groove 62 and a circumferential protrusion 63, which serve the same function as the slider seat insert 2-7: to increase the bonding force between the intake seat insert 2-6 and the base material, ensuring a firm bond between the intake seat insert 2-6 and the cylinder base material 1-11. Viewed perpendicular to the paper, as shown in Figure 12, the right side of the intake seat insert 2-6 is an inclined surface, forming a certain angle with the longitudinal centerline of the intake seat insert 2-6.

[0071] As shown in Figure 8, after the intake seat insert 2-6 and the slide seat insert 2-7 are placed in the mold or the cylinder body 11 containing the above inserts is injected or die-cast, the inclined surface on the right side of the intake seat insert 2-6 contacts and fits with the inclined surface on the left side of the slide seat insert 2-7, and the longitudinal center line of the intake seat insert 2-6 and the longitudinal center line of the slide seat insert 2-7 intersect at the center of the cylinder body 11.

[0072] During injection or die casting, the circumferential groove 62 of the suction seat insert 2-6 and the groove 71 of the slide plate insert 2-7 are filled with lightweight material forming the cylinder body 11. The triangular portions adjacent to the suction seat insert 2-6 and the slide plate insert 2-7 are also filled with lightweight material forming the cylinder body 11, thereby ensuring that the inserts are firmly bonded to the cylinder body base 1-11. This prevents both axial and circumferential relative displacement of the suction seat insert 2-6 within the cylinder body base 1-11.

[0073] In a preferred embodiment, as shown in Figures 13, 14, 15, and 16, there are right views, front views, vertical sectional views, and left views of another slider holder insert. This slider holder insert 2-7 can be replaced by the slider holder insert 2-7 shown in Figures 9, 10, and 11. This slider holder insert 2-7 includes a slider seat 7 for accommodating a slider 8. The slider seat 7 has an opening that extends vertically (perpendicular to the plane of the paper). The outer surface of the slider holder insert 2-7... On the surface, there are intersecting grooves 71, which are used to increase the bonding force between the slider seat insert 2-7 and the base material, and ensure the firm bonding between the slider seat insert 2-7 and the cylinder base material. From the direction perpendicular to the paper, the left side of Figure 14 is an inclined surface, which forms a certain angle with the longitudinal center line of the slider seat insert 2-7. As shown in Figure 14, the top of the slider seat insert has a downward through-hole 73, which is used to accommodate the elastic element.

[0074] In a preferred embodiment, Figure 17 is a schematic diagram of an annular cylinder body with an integral insert having an intake seat and a sliding vane seat. The integral insert 2-9 can replace the intake seat insert 2-6 and the sliding vane seat insert 2-7 in Figure 8. Thus, the intake seat 6 and the sliding vane seat 7 are both disposed on the integral insert 2-9. The integral insert 2-9 has a downward through-hole 73 at the top of the sliding vane seat 7. The function of the through-hole 73 is to accommodate the elastic element. The integral insert 2-9 facilitates the machining of the intake seat 6 and the sliding vane seat 7. Multiple integral inserts 2-9 can be machined in one machining operation, enabling large-scale production and processing, which can improve production efficiency and ensure the consistency of product quality.

[0075] In a preferred embodiment, Figure 18 is a schematic diagram of another annular structure cylinder with an integral insert having an intake seat and a slide seat. This structure is similar to the integral insert 2-9 in Figure 17, except that the top of the integral insert 2-9 on its outer periphery and at the slide seat 7 is closed.

[0076] Figures 19, 20, and 21 correspond to the right, front, and left views of the integrated insert in 11-2. The integrated insert 2-9 is provided with a slide seat 7 and a suction seat 6 for accommodating the slide 8. The slide seat 7 has a through-hole opening (perpendicular to the plane of the paper). On the outer surface of the insert 2-9 (i.e., the first side 95 on the right and the second side 96 on the left), there are intersecting grooves 91. These grooves 91 are used to increase the bonding force between the insert 2-9 and the cylinder base 1-11, ensuring a firm bond between the insert 2-9 and the cylinder base 1-11. Viewed perpendicular to the plane of the paper, the second side 96 on the left and the first side 95 on the right in Figure 20 are both vertical planes. The second side 96 is inclined to the axis of the intake seat 6, and the first side 95 is parallel to the center line of the slide seat 7. The corner of the second side 96 and the inner circumferential surface of the cylinder base 1-11 is provided with a rounded corner clearance 93. The purpose of the clearance 93 is to allow the connecting piece to pass through. The connecting piece connects the upper bearing cover 4, the cylinder 11, and the lower bearing cover 5. As shown in Figure 20, the outer circumferential surface of the slide seat 7 of the integrated insert 2-9 away from the center of the cylinder is closed.

[0077] Figures 22, 23, 24, and 25 correspond to the right view, front view, sectional view, and left view of the integral insert in Figure 17. The integral insert 2-9 is roughly the same as the integral insert 2-9 in Figures 19, 20, and 21. The difference is that the outer peripheral surface of the integral insert 2-9, and the top of the slider seat 7, has a recessed hole 73 that extends downward. The function of the recessed hole 73 is to accommodate an elastic element such as a spring.

[0078] Figure 26 is a horizontal cross-sectional view of the lower bearing cover, showing the position of the lower shaft hole insert 2-51 in the lower flange plate base 1-52.

[0079] Figure 26 is a vertical cross-sectional view of the lower bearing cover. In the figure, the lower shaft hole insert 2-51 is a hollow cylinder, and the hollow part of the lower shaft hole insert 2-51 forms the lower shaft hole portion 511.

[0080] Figure 28 is a cross-sectional view of the lower shaft hole insert. Multiple circumferential lower shaft hole annular grooves 54 and at least one lower shaft hole protrusion 55 are provided on the outer circumferential surface of the cylinder. By providing the lower shaft hole annular grooves 54 and the lower shaft hole protrusion 55, the lower shaft hole insert 2-51 and the lower flange plate base 1-52 can be better connected. Part of the lower flange plate base 1-52 will fill the gap between the lower shaft hole protrusion 55 and the lower shaft hole annular grooves 54, preventing the lower flange plate base 1-52 and the lower shaft hole insert 2-51 from undergoing axial relative displacement.

[0081] Figure 29 is a cross-sectional view of the cylinder base combined with the intake seat insert 2-6 and the slide seat insert 2-7. The cylinder base 1-11 is different from the cylinder base 1-11 with an annular structure in Figure 8. The annular structure of the cover base 1-11 is also provided with an arc-shaped protrusion. The arc-shaped protrusion is used to increase the axial length of the intake seat 6 and the center length of the slide seat 7.

[0082] Figure 30 is a cross-sectional view of the cylinder base and the integrated insert 2-9. The cylinder base 1-11 is different from the cylinder base with an annular structure in Figure 18. The annular structure of the cover base 1-11 is also provided with an arc-shaped protrusion. The arc-shaped protrusion is used to increase the axial length of the intake seat 6 and the center length of the slide seat 7.

[0083] Figure 31 is a cross-sectional view of the cylinder base combined with the intake seat insert 2-6 and the slide seat insert 2-7. The cylinder base 1-11 is different from the cylinder base 1-11 in Figure 29. The cover base 1-11 also has a connecting part 98 on the opposite side of the arc-shaped protrusion. The connecting part 98 has a through connecting hole for the connecting parts to pass through. The connecting parts are used to connect the cylinder, the upper bearing cover and the lower bearing cover.

[0084] Figure 32 is a cross-sectional view of the cylinder base and the integrated insert 2-9. The cylinder base 1-11 is different from the cylinder base 1-11 in Figure 30. The cover base 1-11 has a connecting part 98 on the opposite side of the arc-shaped protrusion. The connecting part 98 has a through hole for the connecting part to pass through, and the connecting part connects the cylinder, the upper bearing cover, and the lower bearing cover.

[0085] In a preferred embodiment of the upper bearing cover 4, as shown in Figures 1, 2, 3, 4, 5, and 6, firstly, an injection or die-casting mold for the upper bearing cover 4 as shown in Figures 1 and 2 is made; secondly, an upper shaft hole insert 2-41 as shown in Figure 5 and an exhaust insert 2-43 as shown in Figure 6 are made; thirdly, the upper shaft hole insert 2-41 and the exhaust insert 2-43 are placed and fixed in the mold; fourthly, 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 the upper bearing cover 4 containing the above inserts.

[0086] The upper shaft hole insert 2-41 is made of the same material and shape as the upper shaft sleeve 41 in the prior art. The upper shaft hole insert 2-41 has a through upper shaft hole 411, so that the long shaft 21 of the crankshaft 2 directly contacts the upper shaft hole 411 in the upper shaft hole insert 2-41. The exhaust insert 2-43 is a finger-shaped object as shown in Figure 6, with an exhaust part 421 through it. Alternatively, the exhaust part 421 can be machined into the upper bearing cover 4 according to specific requirements after injection or die casting. The exhaust part 421 is connected to the exhaust pipe, which ensures the coaxial connection between the exhaust part 421 and the exhaust hole. In summary, by replacing the material of the upper bearing cover 4, except for the insert, with a lightweight material, a lightweight design of the upper bearing cover 4 can be achieved while meeting the requirements of wear resistance and coaxiality.

[0087] In a preferred embodiment of the cylinder body 11, as shown in Figures 1, 2, 8, 9, 10, 11, and 12, firstly, an injection or die-casting mold for the cylinder body 11 as shown in Figures 1 and 2 is made; secondly, a slider seat insert 2-7 as shown in Figures 9, 10, and 113, and a suction seat insert 2-6 as shown in Figure 12 are made; thirdly, the slider seat insert 2-7 and the suction seat insert 2-6 are placed and fixed in the mold; fourthly, 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 the cylinder body 11 containing the inserts.

[0088] The slide seat 7 is formed within the slide seat insert 2-7 to meet the wear resistance requirements of the slide 8 moving within the slide seat 7. The intake seat 6 is formed within the intake seat insert 2-6 to meet the coaxiality requirements of the intake seat 6 and the intake pipe. In summary, by replacing the materials of the cylinder body 11 except for the inserts with lightweight materials, a lightweight design of the cylinder body 11 can be achieved while meeting the requirements of wear resistance and coaxiality.

[0089] In a preferred embodiment of the lower bearing cover 5, as shown in Figures 1, 2, 26, 27, and 28, firstly, an injection or die-casting mold for the lower bearing cover 5 as shown in Figures 1, 2, 26, and 27 is manufactured; secondly, a lower shaft hole insert 2-51 as shown in Figure 28 is manufactured; thirdly, the lower shaft hole insert 2-51 is placed and fixed in the mold; fourthly, 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 the lower bearing cover 5 containing the insert.

[0090] The lower shaft hole insert 2-51 has the same material and shape as the lower shaft sleeve 51 in the prior art. The lower shaft hole insert 2-51 has a through lower shaft hole portion 511, so that the short shaft 23 directly rubs against the lower shaft hole portion 511 in the lower shaft hole insert 2-51. In summary, replacing the material of the lower bearing cover 5 except for the insert with a lightweight material and replacing it with the lower flange plate base 1-52 can achieve a lightweight design of the lower bearing cover 5 while meeting the requirements of wear resistance and coaxiality.

[0091] For the compressor pump body of the present invention, the upper bearing cover 4, cylinder body 11 or lower bearing cover 5 except for the inserts, namely the upper shaft hole insert 2-41, the exhaust insert 2-43, the intake seat insert 2-6, the vane seat insert 2-7 and the lower shaft hole insert 2-51, are replaced with lightweight materials, and the upper bearing cover 4, cylinder body 11 and lower bearing cover 5 with the above inserts are manufactured by injection or die casting. While meeting the requirements of wear resistance or coaxiality, the lightweight design of the compressor pump body is achieved.

[0092] In other words, in this invention, the crankshaft 2, piston 3, and vane 8, which are moving parts, are made of cast iron, cast steel, or other metallurgical parts using existing technology; at least one of the upper bearing cover 4, lower bearing cover 5, and cylinder body 11, which are fixed parts, is a composite part formed by using a lightweight material as the base material and inserts, that is, the part of the composite part that rubs against the moving parts or the part that needs to be connected to the external air intake or exhaust pipe is provided with inserts, and the remaining parts of the composite part are made of lightweight materials as the base material; the composite part is formed by injection or die casting of lightweight materials from inserts fixed in the mold, and the lightweight materials are preferably aluminum alloy, magnesium alloy, titanium alloy, or engineering plastics. Therefore, the composite part can meet both the requirements for lightweight pump body and the requirements for wear resistance of moving parts.

[0093] In a preferred embodiment, as shown in Figure 2, a dual-cylinder compressor pump body is provided. The difference between the dual-cylinder compressor pump body and the single-cylinder compressor pump body in Embodiment 1 is that the compressor pump body in Embodiment 2 has two cylinder bases 1-11, with a partition 12 disposed between the two cylinder bases 1-11. The crankshaft 2 has two eccentric shafts 22, which are placed inside the corresponding cylinder bases 1-11. The number of upper bearing caps 4 and lower bearing caps 5 is the same as that in Embodiment 1. The number of vane seats 7 and intake seats 6 is the same as that of cylinder 11 in Embodiment 2, which is two in each case.

[0094] Therefore, for the compressor pump body of a twin-cylinder unit, at least one of the upper bearing cover 4, the lower bearing cover 5, and the two cylinder bodies 11, which are fixed components, is made of a composite of inserts and lightweight materials.

[0095] 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. A rotary compressor pump body, comprising: The cylinder has a compression chamber inside, and a slide seat and an intake seat are radially provided on the inner circumferential wall for accommodating the slide. The intake seat is connected to the intake pipe. The crankshaft consists of a long shaft section, an eccentric shaft section, and a short shaft section. piston; The upper bearing cap is located on the top of the cylinder block and has an upper bushing through which the long shaft portion of the crankshaft passes, and has an exhaust section connected to an external exhaust pipe. The lower bearing cap is located at the bottom of the cylinder block and has a lower bushing through which the short shaft portion of the crankshaft passes. The upper bearing cap, piston, and lower bearing cap are sequentially fitted onto the crankshaft along its axial direction, forming a dynamic seal with the cylinder block; The characteristic feature is that at least one of the cylinder body, the upper bearing cover, and the lower bearing cover is made of a composite of an insert and a lightweight material; The insert contacts the crankshaft or vane and / or is connected to an external intake or exhaust pipe. The cylinder block includes a cylinder block base, and an arc-shaped protrusion is provided on the outer side of the annular structure of the cylinder block base. The arc-shaped protrusion is used to increase the axial length of the intake seat and the center length of the slide seat. The cylinder block base has a connecting part on the opposite side of the arc-shaped protrusion. A connecting hole is opened through the connecting part for the connecting component to pass through. The connecting component is used to connect the cylinder block, the upper bearing cover, and the lower bearing cover. The upper bearing cover includes the upper bushing and the upper flange plate; the insert is an upper shaft hole insert, and its external dimensions are the same as those of the upper bushing. The outer peripheral wall of the upper shaft hole insert is provided with an upper shaft hole annular groove, and an upper shaft hole protrusion is provided in the upper shaft hole annular groove; the outer surface of the upper shaft hole protrusion is provided with vertical texture; The insert also includes an exhaust insert, the side of which has an arc-shaped surface that fits the outer wall of the upper shaft hole insert.

2. The rotary compressor pump body according to claim 1, characterized in that, When there are multiple cylinders arranged vertically, a partition is provided between the cylinders.

3. The rotary compressor pump body according to claim 1, characterized in that, The upper bearing cover is integrally injection-molded or die-cast from an exhaust insert and an upper shaft hole insert with a lightweight material.

4. A rotor compressor pump body according to claim 1 or 2, characterized in that The lower bearing cover includes a lower bushing and a lower flange plate; the insert is a lower shaft hole insert, and its external dimensions are the same as those of the lower bushing.

5. A compressor pump body of claim 4, wherein, The lower bearing cover is integrally injection-molded or die-cast from a lower shaft hole insert and a lightweight material.

6. A rotary compressor pump body according to claim 1 or 2, characterized in that, The insert is a slider seat insert and / or an air intake seat insert.

7. A compressor pump body of claim 6, wherein When the insert in the cylinder is a slide block insert, the slide block insert has a slide block seat that moves relative to the end of the slide block.

8. A compressor pump body according to claim 7, wherein When the insert in the cylinder is a hollow intake seat insert, the intake seat insert has a through intake seat, and the intake seat is connected to the compression chamber in the cylinder.

9. A compressor pump body of claim 8, wherein, When the inserts in the cylinder body are a sliding vane insert and an intake insert, the intake insert has an inclined surface that fits against one side of the outer wall of the sliding vane insert. The axis of the intake insert intersects the center line of the sliding vane insert at a point, which is the center of the cross-section of the compression chamber of the cylinder body.

10. A compressor pump body as defined in claim 6 wherein, The cylinder body is integrally injection-molded or die-cast from the intake seat insert and / or the slide seat insert with a lightweight material.

11. A compressor pump body of claim 1, wherein, The insert is made of cast iron, cast steel or other metallurgical profiles.

12. A compressor pump body of claim 1, wherein, The lightweight material is aluminum alloy, magnesium alloy, titanium alloy, or engineering plastic.

13. A compressor pump body of claim 4, wherein, The outer peripheral wall of the lower shaft hole insert is provided with a lower shaft hole annular groove, and a lower shaft hole protrusion is provided in the lower shaft hole annular groove.

14. A compressor pump body of claim 9, wherein, The two sides of the slide block insert are provided with intersecting grooves.

15. A compressor pump body of claim 6, wherein, The outer axial wall of the air intake insert is provided with a circumferential groove and a circumferential protrusion.

16. A method of manufacturing a rotor compressor pump body as claimed in any one of claims 1 to 15, characterised in that, Includes the following steps: (1) Injection or die casting molds for making upper bearing caps, cylinder bodies or lower bearing caps; (2) Make the upper shaft hole insert, exhaust insert, slide block insert, intake block insert or lower shaft hole insert; (3) Place and fix the above-mentioned inserts in the corresponding molds; (4) Lightweight material is injected or pressed into the mold as the base material, cooled and formed, and then removed to obtain the upper bearing cover, cylinder body or lower bearing cover containing the above-mentioned inserts. (5) Assemble the upper bearing cover, cylinder body or lower bearing cover containing the above-mentioned inserts with the crankshaft and piston in sequence to form the rotor compressor pump body.

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