Oil passage control system for reciprocating piston compressor

Abstract

The application discloses a kind of oil circuit control systems for reciprocating piston compressor, it includes main shaft, the annular groove is opened in the side of the main shaft and is close to top end portion, the upper surface of the main shaft is fixedly connected with crank, the upper surface of the crank and close to left end is fixedly connected with connecting rod journal, the upper surface of the connecting rod journal is opened with oil hole, the side of the connecting rod journal is opened with oil groove, the number of the oil groove is two, two the oil groove is about connecting rod journal center symmetry, the bottom of the connecting rod journal and the fixed connection of crank is opened with chamfer, the side of the connecting rod journal is movably connected with connecting rod big end, the upper surface of the connecting rod big end is opened with big through-hole in the middle. By the above-mentioned system setting two oil grooves can guarantee the demand of piston to lubricating oil, the part of oil groove close to the upper surface of connecting rod journal is set into circular truncated cone, it is cooperated with the oil outlet on the connecting rod big end and can be sprayed farther so that the lubricating effect is better.

Description

Technical Field

[0001] This invention relates to the field of reciprocating piston refrigeration compression technology, and particularly to an oil circuit control system for a reciprocating piston compressor. Background Technology

[0002] In a reciprocating piston compressor unit, the crankshaft is rotated by a motor, which pumps lubricating oil from the bottom of the housing to the crankshaft crank. The oil grooves on the surface of the long crankshaft lubricate the friction pair between the crankshaft and the crankshaft bore in the crankcase; the oil grooves on the crankshaft lubricate the friction pair between the connecting rod big end and the crankshaft; and the oil hole in the center of the connecting rod lubricates the friction pair between the connecting rod small end and the plug pin.

[0003] If the crankshaft does not have an oil plug, lubricating oil can splash from the oil outlet on the crankshaft to lubricate the piston, ensuring lubrication of the piston-cylinder bore in the crankcase and the friction pair between the small end of the connecting rod and the piston pin. While the crankshaft without an oil plug can adequately lubricate the piston, it can cause insufficient oil pressure at the crankshaft and connecting rod big end, preventing the formation of a stable oil film and leading to crankshaft wear. Furthermore, since splash lubrication occurs throughout the entire process, excessive splashing of lubricating oil can be easily drawn into the compressor cylinder by the intake muffler, thus entering the system and affecting efficiency. Summary of the Invention

[0004] This invention provides an oil circuit control system for a reciprocating piston compressor, which features two oil grooves to ensure the piston's lubrication needs are met; the portion of the oil groove near the upper surface of the connecting rod journal is shaped like a frustum; this structure, in conjunction with the oil outlet on the large end of the connecting rod, allows for a longer spray distance, resulting in better lubrication.

[0005] To achieve the above objectives, an oil circuit control system for a reciprocating piston compressor is provided, comprising a main shaft, an annular groove formed on the side of the main shaft near its top, a crank fixedly connected to the upper surface of the main shaft, a connecting rod journal fixedly connected to the upper surface of the crank near its left end, an oil hole formed on the upper surface of the connecting rod journal, and two oil grooves formed on the side of the connecting rod journal, the two oil grooves being symmetrical about the center plane of the connecting rod journal, and the bottom of the connecting rod journal being fixedly connected to the crank. A chamfer is provided at the location. A connecting rod large end is movably connected to the side of the connecting rod journal. A large through hole is provided in the middle of the upper surface of the connecting rod large end. The inner surface of the large through hole contacts the outer surface of the connecting rod journal. A connecting rod is fixedly connected to the side of the connecting rod large end near its lower surface. A connecting rod small end is fixedly connected to the other end of the connecting rod. A small through hole is provided on the upper surface of the connecting rod small end. A piston body is fixedly connected to the connecting rod small end. An oil outlet is provided on the side of the connecting rod large end near the connecting rod. The cross-sectional shape is trapezoidal, with the short base of the trapezoid located on the outer surface of the large end of the connecting rod and the long base located on the inner surface of the large end of the connecting rod. A main shaft is provided to facilitate piston movement; an annular groove is provided for lubrication of the main shaft; a crank is provided to convert the reciprocating motion of the piston into the rotational motion of the crankshaft; a connecting rod journal is provided for easy connection to the large end of the connecting rod; an oil groove on the connecting rod journal facilitates lubrication of both the connecting rod journal and the large end of the connecting rod; two oil grooves are provided to increase the oil output; a chamfer is provided at the bottom of the connecting rod journal where it is fixedly connected to the crank to ensure effective lubrication; a large through hole is provided in the middle of the large end of the connecting rod for connection with the connecting rod journal; a small through hole is provided at the small end of the connecting rod for easy insertion of a locating pin; the piston body is fixedly connected to the small end of the connecting rod to complete piston movement; and an oil outlet is provided on one side of the large end of the connecting rod to spray lubricating oil from the oil groove on the connecting rod journal to lubricate the piston body.

[0006] According to the oil circuit control system for a reciprocating piston compressor, the cross-sectional shape of the annular groove is arc-shaped, and a small-diameter hole is provided at the top of the annular groove. The cross-section of the annular groove is set to be arc-shaped to facilitate the flow of lubricating oil in the annular groove.

[0007] According to the oil circuit control system for a reciprocating piston compressor, a cylindrical groove is provided on the lower surface of the crank near the connecting rod journal. The cylindrical groove is fixedly connected to a small-diameter hole to form an oil circuit. The cylindrical groove is provided on the lower surface of the crank near the connecting rod journal to connect with the hole on the main shaft.

[0008] According to the oil circuit control system for a reciprocating piston compressor, the cross-sectional shape of the middle part of the oil sump is rectangular, and a small hole is provided at one end of the oil sump near the lower surface. The small hole is connected to a cylindrical groove. The part of the oil sump near the upper surface is frustum-shaped. The frustum shape of the part of the oil sump near the upper surface is to match the oil outlet on the large end of the connecting rod.

[0009] According to the oil circuit control system for a reciprocating piston compressor, a square groove is provided on the lower surface of the main shaft. The cross-sectional shape of the square groove is rectangular. There are two square grooves, which are located vertically at the bottom of the main shaft. The purpose of setting two vertical square grooves is to better lubricate the main shaft.

[0010] According to the oil circuit control system for a reciprocating piston compressor, the outer surface of the small end of the connecting rod is connected to the inner side of the piston, a positioning pin is fixedly connected to the inner surface of the small end of the connecting rod, and a fixing pin is fixedly connected to the top of the positioning pin. The positioning pin is used to position the piston body, and the fixing pin is used to facilitate the fixing of the positioning pin.

[0011] The beneficial effects of this invention are as follows: the two oil grooves ensure the piston's lubrication requirements are met; the portion of the oil groove near the upper surface of the connecting rod journal is shaped like a frustum; this structure, in conjunction with the oil outlet on the large end of the connecting rod, allows for a longer spray distance, resulting in better lubrication.

[0012] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a front view of the crank-connecting rod mechanism of an oil circuit control system for a reciprocating piston compressor according to the present invention;

[0015] Figure 2 This is a perspective view of the crank mechanism of an oil circuit control system for a reciprocating piston compressor according to the present invention.

[0016] Figure 3 This is a perspective view of the linkage mechanism of an oil circuit control system for a reciprocating piston compressor according to the present invention;

[0017] Figure 4 This is a cross-sectional view of the linkage mechanism of an oil circuit control system for a reciprocating piston compressor according to the present invention.

[0018] Legend:

[0019] 1. Piston body; 2. Crank; 3. Square groove; 4. Annular groove; 5. Fixing pin; 6. Locating pin; 7. Oil groove; 8. Spindle; 9. Connecting rod journal; 10. Oil hole; 11. Connecting rod small end; 12. Connecting rod; 13. Oil outlet; 14. Connecting rod large end; 15. Large through hole; 16. Small through hole. Detailed Implementation

[0020] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0021] refer to Figures 1 to 4 This invention discloses an oil circuit control system for a reciprocating piston compressor, comprising a main shaft 8, an annular groove 4 on the side of the main shaft 8 near its top, a crank 2 fixedly connected to the upper surface of the main shaft 8, a connecting rod journal 9 fixedly connected to the upper surface of the crank 2 near its left end, an oil hole 10 on the upper surface of the connecting rod journal 9, two oil grooves 7 on the side of the connecting rod journal 9, symmetrical about the center plane of the connecting rod journal 9, a chamfer at the bottom of the connecting rod journal 9 where it is fixedly connected to the crank 2, and a connecting rod big end 14 movably connected to the side of the connecting rod journal 9. A large through hole 15 is formed in the middle of the upper surface of the connecting rod 14. The inner surface of the large through hole 15 contacts the outer surface of the connecting rod journal 9. A connecting rod 12 is fixedly connected to the side of the connecting rod large end 14 near the lower surface. The other end of the connecting rod 12 is fixedly connected to the connecting rod small end 11. A small through hole 16 is formed on the upper surface of the connecting rod small end 11. A piston body 1 is fixedly connected to the connecting rod small end 11. An oil outlet 13 is formed on the side of the connecting rod large end 14 near the connecting rod 12. The cross-sectional shape of the oil outlet 13 is trapezoidal. The short base of the trapezoid is located on the outer surface of the connecting rod large end 14, and the long base of the trapezoid is located on the inner surface of the connecting rod large end 14. The cross-sectional shape of the annular groove 4 is arc-shaped, and a small diameter hole is formed at the top of the annular groove 4.

[0022] A cylindrical groove is formed on the lower surface of the crank 2 near the connecting rod journal 9. The cylindrical groove is fixedly connected to a small-diameter hole to form an oil passage. The cross-sectional shape of the middle part of the oil groove 7 is rectangular. A small hole is formed on the lower surface of the oil groove 7, which is connected to the cylindrical groove. The upper surface of the oil groove 7 is frustoconical.

[0023] The lower surface of the main shaft 8 is provided with a square groove 3. The cross-sectional shape of the square groove 3 is rectangular. There are two square grooves 3, which are located vertically at the bottom of the main shaft 8. The outer surface of the small end 11 of the connecting rod is connected to the inner side of the piston. A positioning pin 6 is fixedly connected to the inner surface of the small end 11 of the connecting rod, and a fixing pin 5 is fixedly connected to the top of the positioning pin 6.

[0024] Working principle: First, crank 2 is fixedly connected to the upper surface of spindle 8. Then, connecting rod journal 9 is fixedly connected to the left side of crank 2. Next, the large end 14 of connecting rod is fitted onto connecting rod journal 9. Finally, piston body 1 is fitted onto small end 11 of connecting rod and positioned by locating pin 6. During operation, the motor drives spindle 8 to rotate, causing lubricating oil to be pumped from the bottom of housing to crank 2. The lubricating oil enters the oil groove 7 of connecting journal 9 through the small hole on crank 2. The oil groove 7 on crank 2 can lubricate the large end 14 of connecting rod and connecting journal 9. When the large end 14 of connecting rod and connecting journal 9 rotate to a suitable angle, the lubricating oil is sprayed out through the oil outlet 13 on the large end 14 of connecting rod to lubricate piston body. The lubricating oil passes through the annular groove 4 on the surface of spindle 8 to lubricate spindle 8 and spindle housing. The lubricating oil passes through the central oil hole of connecting rod 12 to lubricate small end 11 of connecting rod and locating pin 6.

[0025] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hydraulic circuit control system for a reciprocating piston compressor, characterized in that, The system includes a main shaft (8), an annular groove (4) on the side and near the top of the main shaft (8), a crank (2) fixedly connected to the upper surface of the main shaft (8), a connecting rod journal (9) fixedly connected to the upper surface and near the left end of the crank (2), an oil hole (10) on the upper surface of the connecting rod journal (9), an oil groove (7) on the side of the connecting rod journal (9), two oil grooves (7) symmetrical about the center face of the connecting rod journal (9), a chamfer at the bottom of the connecting rod journal (9) where it is fixedly connected to the crank (2), a connecting rod big end (14) movably connected to the side of the connecting rod journal (9), and a hole in the middle of the upper surface of the connecting rod big end (14). There is a large through hole (15), the inner surface of the large through hole (15) is in contact with the outer surface of the connecting rod journal (9), a connecting rod (12) is fixedly connected to the side of the large end (14) of the connecting rod and near the lower surface, the other end of the connecting rod (12) is fixedly connected to the small end (11) of the connecting rod, a small through hole (16) is opened on the upper surface of the small end (11), a piston body (1) is fixedly connected to the small end (11), an oil outlet (13) is opened on the side of the large end (14) of the connecting rod near the connecting rod (12), the cross-sectional shape of the oil outlet (13) is trapezoidal, the short base of the trapezoid is located on the outer surface of the large end (14) of the connecting rod, and the long base of the trapezoid is located on the inner surface of the large end (14) of the connecting rod; The oil groove (7) has a rectangular cross-sectional shape in the middle part. A small hole is provided at one end of the oil groove (7) near the lower surface. The small hole is connected to a cylindrical groove. The oil groove (7) is frustum-shaped near the upper surface. A square groove (3) is provided on the lower surface of the main shaft (8). The square groove (3) has a rectangular cross-sectional shape. There are two square grooves (3). The two square grooves (3) are located vertically at the bottom of the main shaft (8) and are perpendicular to each other. During operation, firstly, the crank (2) is fixedly connected to the upper surface of the main shaft (8), then the connecting rod journal (9) is fixedly connected to the left side of the crank (2), then the large end (14) of the connecting rod is fitted onto the connecting rod journal (9), and finally the piston body (1) is fitted onto the small end (11) of the connecting rod and positioned by the locating pin (6). During operation, the main shaft (8) is rotated by the motor, so that the lubricating oil is pumped from the bottom of the housing to the crank (2). The lubricating oil enters the oil groove of the connecting rod journal (9) through the small hole on the crank (2). In (7), the oil groove (7) on the crank (2) can lubricate the big end (14) of the connecting rod and the journal (9). When the big end (14) of the connecting rod and the journal (9) rotate to a suitable angle, the lubricating oil is sprayed out through the oil outlet (13) on the big end (14) of the connecting rod to lubricate the piston body. The lubricating oil passes through the annular groove (4) on the surface of the main shaft (8) to lubricate the main shaft (8) and the main shaft (8) housing. The lubricating oil passes through the central oil hole of the connecting rod (12) to lubricate the small end (11) of the connecting rod and the locating pin (6).

2. The oil circuit control system for a reciprocating piston compressor according to claim 1, characterized in that, The cross-sectional shape of the annular groove (4) is arc-shaped, and a small diameter hole is provided at the top of the annular groove (4).

3. The oil circuit control system for a reciprocating piston compressor according to claim 1, characterized in that, A cylindrical groove is provided on the lower surface of the crank (2) near the connecting rod journal (9), and the cylindrical groove is fixedly connected to a small diameter hole to form an oil passage.

4. The oil circuit control system for a reciprocating piston compressor according to claim 1, characterized in that, The outer surface of the small end (11) of the connecting rod is connected to the inner side of the piston. A positioning pin (6) is fixedly connected to the inner surface of the small end (11) of the connecting rod, and a fixing pin (5) is fixedly connected to the top of the positioning pin (6).

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