Eight-cylinder piston compressor

Abstract

The utility model relates to the technical field of compressor discloses eight cylinder piston compressor, including the casing, the top fixedly connected with upper bearing mounting plate of casing, the bottom fixedly connected with lower bearing mounting plate of casing, the middle part rotationally connected with eccentricity main shaft of lower bearing mounting plate, the outer wall of eccentricity main shaft is provided with double cam symmetry, double cam includes two eccentric cylinders and hollow section set up on two eccentric cylinders, the eccentricity between the axis of two eccentric cylinders and the axis of hollow section is same with eccentricity of eccentricity main shaft, the outer wall of guide rod is provided with guide rod linear bearing. In the utility model, through setting up upper bearing mounting plate and lower bearing mounting plate in the casing top and bottom respectively, the both end support of eccentricity main shaft is formed, and the eccentric motion of eccentricity main shaft and eccentric wheel with the same eccentricity is complementary, and the fixed end and the support end are coaxial when ensuring eccentricity main shaft rotation.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to an eight-cylinder piston compressor. Background Technology

[0002] Compressors are closely related to all aspects of modern industry and life. As a core device for gas pressurization and transportation, they are a general-purpose mechanical device that plays an important role. Compressors can be used in refrigeration, engines, gas transportation, chemical processes, machinery manufacturing, aquaculture, medical applications, and almost any other place that requires the transportation or use of compressed gases.

[0003] Traditional reciprocating compressors typically use a crank-connecting rod mechanism to drive the piston in reciprocating motion. Motion conversion is achieved through a single crankshaft or cam structure. They are often connected to the piston rod via a split crankshaft. The rotational motion of the crankshaft is converted into the linear motion of the piston via the connecting rod. During operation, the machining and assembly precision of the split crankshaft is difficult to guarantee, which can easily lead to loosening of the main shaft, resulting in a large radial runout of the main shaft and affecting the overall stability of the compressor. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an eight-cylinder piston compressor, which aims to improve the problem that traditional piston compressors are prone to main shaft loosening during operation, resulting in large radial runout of the main shaft and affecting the overall stability of the compressor.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an eight-cylinder piston compressor, comprising a housing, an upper bearing mounting plate fixedly connected to the top of the housing, a lower bearing mounting plate fixedly connected to the bottom of the housing, an eccentric main shaft rotatably connected to the middle of the lower bearing mounting plate, double cams symmetrically arranged on the outer wall of the eccentric main shaft, each double cam comprising two eccentric cylinders and a hollow section formed on the two eccentric cylinders, the eccentricity between the axes of the two eccentric cylinders and the axis of the hollow section being the same as the eccentricity of the eccentric main shaft, guide rods symmetrically arranged on the outer wall of the double cams, guide rod linear bearings arranged on the outer wall of the guide rods, the outer wall of the guide rod linear bearings fixedly connected to the outer wall of the housing, a piston structure arranged at one end of the guide rods, a drive structure fixedly arranged at the bottom end of the eccentric main shaft, an eccentric wheel fixedly connected to the top of the eccentric main shaft, and the outer wall of the eccentric wheel rotatably connected to the middle of the upper bearing mounting plate.

[0006] By adopting the above technical solution, upper bearing mounting plates and lower bearing mounting plates are respectively set at the top and bottom of the housing to provide support for the eccentric main shaft at both ends. By utilizing the complementary eccentric motion of the eccentric main shaft with consistent eccentricity and the eccentric wheel, it is ensured that the fixed end and the support end are coaxial when the eccentric main shaft rotates. Furthermore, through the cooperation of the double cams symmetrically arranged on the outer wall of the eccentric main shaft and the guide rod linear bearing, the double cams rotate in opposite directions to drive the guide rod to perform reciprocating linear motion, so that the cylinder force is evenly distributed. This improves the operational stability of the eccentric main shaft and solves the problem that traditional piston compressors are prone to main shaft loosening during operation, resulting in large radial runout of the main shaft and affecting the overall stability of the compressor.

[0007] Preferably, the piston structure includes a piston ring, the middle of which is disposed at one end of a guide rod, a ring cap is installed on the side of the piston ring away from the guide rod, and a cylinder liner is provided on the outer wall of the piston ring.

[0008] Preferably, a water jacket is installed on the outer wall of the cylinder liner, one side of the water jacket is installed on the outer wall of the housing, the other side of the water jacket is installed on the cylinder head, and a valve plate is provided between the water jacket and the cylinder head.

[0009] Preferably, the drive structure includes a motor, the output end of which is fixedly connected to the bottom end of the eccentric spindle, and the top of which is fixedly disposed at the bottom of the lower bearing mounting plate.

[0010] Preferably, a lower bearing for the main shaft is installed between the eccentric main shaft and the lower bearing mounting plate, and an upper bearing for the main shaft is installed between the eccentric wheel and the upper bearing mounting plate.

[0011] Preferably, a double-cam inner bearing is installed between the eccentric spindle and the double cam, and a double-cam outer bearing is installed between the double cam and the guide rod.

[0012] Preferably, an upper balance block is installed on one side of the outer wall of the eccentric spindle, and the upper balance block is located between the double cam and the eccentric wheel.

[0013] Preferably, a lower balance block is installed on the other side of the outer wall of the eccentric spindle, and the lower balance block is located between the double cam and the lower bearing of the spindle.

[0014] Preferably, a counterweight is mounted on the top of the eccentric spindle, and the counterweight is fan-shaped.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, by setting an upper bearing mounting plate and a lower bearing mounting plate at the top and bottom of the housing respectively, the eccentric main shaft is supported at both ends. By utilizing the complementary eccentric motion of the eccentric main shaft with consistent eccentricity and the eccentric wheel, it is ensured that the fixed end and the support end are coaxial when the eccentric main shaft rotates. Then, through the cooperation of the double cams symmetrically arranged on the outer wall of the eccentric main shaft and the guide rod linear bearing, the double cams rotate in opposite directions to drive the guide rod to perform reciprocating linear motion, so that the cylinder force is evenly distributed. This improves the running stability of the eccentric main shaft and improves the problem that traditional piston compressors are prone to main shaft loosening during operation, resulting in large radial runout of the main shaft and affecting the overall stability of the compressor.

[0017] 2. In this utility model, the bearing mounting plates on the upper and lower parts of the housing and the main shaft bearing form support at both ends. With the coaxial design of the eccentric wheel and the eccentric main shaft, the fixed end and the support end remain coaxial when the main shaft rotates, reducing radial runout. The balance block and counterweight block set on the eccentric main shaft can be used to offset the rotational imbalance force through dynamic balancing, reducing vibration and noise during equipment operation. This not only makes the compressor run more smoothly, but also reduces noise pollution in the working environment.

[0018] 3. In this utility model, the eight cylinders are evenly distributed through the housing, and the uniform distribution of the cylinders is achieved by two sets of double cams. Compared with traditional compressors with fewer cylinders, more gas can be compressed in the same amount of time, increasing the exhaust volume and meeting the industrial production demand for large-flow compressed gas. At the same time, the modular design of multiple sets of double cams installed on the eccentric main shaft allows the number of compressor cylinders to be expanded according to needs, increasing the applicability of the equipment. It can be flexibly adjusted according to actual working conditions, improving the flexibility of equipment use.

[0019] 4. In this utility model, by using bearings to connect the various moving parts, sliding friction is converted into rolling friction, which reduces the motion resistance between the parts, reduces energy loss, and also reduces the wear rate of the parts, thus extending the overall service life of the compressor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of the eight-cylinder piston compressor housing proposed in this utility model.

[0021] Figure 2 This is an exploded view of the eight-cylinder piston compressor proposed in this utility model.

[0022] Figure 3 This is a partial structural diagram of the counterweight block of the eight-cylinder piston compressor proposed in this utility model.

[0023] Figure 4 This is a partial structural diagram of the upper balance block of the eight-cylinder piston compressor proposed in this utility model.

[0024] Figure 5 This is a partial structural diagram of the lower balance block of the eight-cylinder piston compressor proposed in this utility model;

[0025] Figure 6 This is a partial structural diagram of the eccentric main shaft of the eight-cylinder piston compressor proposed in this utility model.

[0026] Figure 7 This is a partial structural diagram of the guide rod linear bearing of the eight-cylinder piston compressor proposed in this utility model;

[0027] Figure 8 This is a partial structural diagram of the double cam external bearing of the eight-cylinder piston compressor proposed in this utility model.

[0028] Figure 9 This is a partial structural diagram of the guide rod of the eight-cylinder piston compressor proposed in this utility model;

[0029] Figure 10 This is a partial structural diagram of the double cam of the eight-cylinder piston compressor proposed in this utility model.

[0030] Figure 11 This is a top view schematic diagram of the double-cam structure of the eight-cylinder piston compressor proposed in this utility model.

[0031] Figure 12 for Figure 11 Schematic diagram of AA section;

[0032] Figure 13 This is a three-dimensional structural diagram of the eight-cylinder piston compressor proposed in this utility model.

[0033] Legend:

[0034] 1. Eccentric spindle; 2. Lower bearing mounting plate; 3. Housing; 4. Guide rod; 5. Guide rod linear bearing; 6. Upper bearing mounting plate; 7. Counterweight; 8. Lower spindle bearing; 9. Water jacket; 10. Cylinder liner; 11. Cylinder head; 12. Lower counterweight; 13. Double cam; 14. Motor; 15. Upper spindle bearing; 16. Piston ring; 17. Ring cover; 18. Valve plate; 19. Double cam outer bearing; 20. Double cam inner bearing; 21. Upper counterweight; 22. Eccentric wheel. Detailed Implementation

[0035] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Reference Figures 1-13 This utility model provides an embodiment of an eight-cylinder piston compressor, including a housing 3. An upper bearing mounting plate 6 is fixedly connected to the top of the housing 3, and a lower bearing mounting plate 2 is fixedly connected to the bottom of the housing 3. An eccentric main shaft 1 is rotatably connected to the middle of the lower bearing mounting plate 2. A double cam 13 is symmetrically arranged on the outer wall of the eccentric main shaft 1. The double cam 13 includes two eccentric cylinders and a hollow section opened on the two eccentric cylinders. The eccentricity between the axis of the two eccentric cylinders and the axis of the hollow section is the same as the eccentricity of the eccentric main shaft 1. A guide rod 4 is symmetrically arranged on the outer wall of the double cam 13. A guide rod linear bearing 5 is arranged on the outer wall of the guide rod 4. The outer wall of the guide rod linear bearing 5 is fixedly connected to the outer wall of the housing 3. A piston structure is arranged at one end of the guide rod 4. A drive structure is fixedly arranged at the bottom end of the eccentric main shaft 1. An eccentric wheel 22 is fixedly connected to the top of the eccentric main shaft 1. The outer wall of the eccentric wheel 22 is rotatably connected to the middle of the upper bearing mounting plate 6.

[0037] Specifically, the housing 3 serves as the main support structure, with the upper bearing mounting plate 6 and the lower bearing mounting plate 2 fixed at the top and bottom respectively. The eccentric wheel 22 and the eccentric main shaft 1 are rotatably connected at their midpoints. A double cam 13 is symmetrically arranged on the outer wall of the eccentric main shaft 1. This double cam consists of two eccentric cylinders and their hollow sections. The eccentricity of the axes of the two eccentric cylinders and the axis of the hollow section is consistent with the eccentricity of the eccentric main shaft 1, ensuring precise motion transmission. The guide rods 4 are made of alloy structural steel and are symmetrically arranged on the outside of the two eccentric cylinders of the double cam 13. Each eccentric cylinder corresponds to two guide rods 4, arranged perpendicularly at 90°. The guide rod linear bearings 5 ​​fitted on the outer wall of the guide rods 4 are high-precision linear motion bearings. Their outer walls are fixed in the pre-set mounting holes on the outer wall of the housing 3 by positioning pins and bolts, ensuring that the guide rods 4 can only perform reciprocating linear motion along their own axis.

[0038] The operation of the drive structure drives the eccentric spindle 1 to rotate, which in turn drives the eccentric wheel 22 to rotate in the middle of the upper bearing mounting plate 6. Due to the eccentric design of the eccentric spindle 1, the double cam 13 inside the housing 3 rotates in the opposite direction, thereby driving the guide rod 4 to convert the rotational motion into reciprocating linear motion under the constraint of the guide rod linear bearing 5. One end of the guide rod 4 is connected to the piston structure, so the reciprocating motion of the guide rod 4 drives the piston structure to operate, realizing gas compression. The eccentricity of the eccentric wheel 22 is consistent with the eccentricity of the eccentric spindle 1. Thus, the eccentric motion of the eccentric wheel 22 and the eccentric motion of the eccentric spindle 1 complement each other, ensuring that the fixed end and the support end remain coaxial when the eccentric spindle 1 rotates, reducing the radial runout of the spindle and improving the overall operational stability.

[0039] Reference Figure 1 , Figure 2 , Figure 6 , Figure 7 , Figure 13 The piston structure includes a piston ring 16, with its center positioned at one end of a guide rod 4. A ring cap 17 is installed on the side of the piston ring 16 away from the guide rod 4, and a cylinder liner 10 is installed on the outer wall of the piston ring 16. A water jacket 9 is installed on the outer wall of the cylinder liner 10, with one side of the water jacket 9 installed on the outer wall of the housing 3 and the cylinder head 11 installed on the other side of the water jacket 9. A valve plate 18 is provided between the water jacket 9 and the cylinder head 11.

[0040] Specifically, the piston structure includes a piston ring 16. The center of the piston ring 16 is embedded in one end of the guide rod 4 via a positioning step, and the two are fixedly connected by four countersunk screws evenly distributed circumferentially to ensure the coaxiality of the piston ring 16 and the guide rod 4. A ring cap 17 is installed on the side of the piston ring 16 away from the guide rod 4 via a stop. An elastic sealing gasket is provided between the ring cap 17 and the piston ring 16, and it is fastened by six evenly distributed bolts to prevent gas leakage. The outer wall of the piston ring 16 forms a precision fit with the inner wall of the cylinder liner 10. The cylinder liner 10 is made of high wear-resistant alloy cast iron, and its inner wall is honed to ensure the sealing and wear resistance of the piston ring 16 during reciprocating motion. A water jacket 9 is interference-fitted onto the outer wall of the cylinder liner 10. The water jacket 9 is made of die-cast aluminum alloy, and one side is fixed to a pre-set mounting boss on the outer wall of the housing 3 by bolts. The other side is fitted with a cylinder head 11 by a positioning pin and bolts. A valve plate 18 is sandwiched between the water jacket 9 and the cylinder head 11. The valve plate 18 is made of stainless steel and has symmetrically arranged intake valve holes and exhaust valve holes. Spring-type valve plates are installed at the valve holes. The intake valve plates and exhaust valve plates are fixed to both sides of the valve plate 18 by limiting plates. The upper and lower ends of the water jacket 9 are respectively provided with water inlets and outlets. The water inlet is connected to an external cooling water source through a hose, and the water outlet is connected to the return water pipeline to form a cooling water circulation channel.

[0041] When the guide rod 4 reciprocates linearly, it drives the piston ring 16 and the ring cover 17 to reciprocate within the cylinder liner 10. As the piston ring 16 moves inward into the cylinder liner 10, the gas inside is compressed, and the pressure gradually increases. When the pressure exceeds the opening pressure of the exhaust valve plate, the exhaust valve plate bends upward against the spring force, and the compressed gas is discharged through the exhaust valve orifice via the channel between the valve plate 18 and the cylinder head 11. When the piston ring 16 moves outward, the volume inside the cylinder liner 10 increases, the pressure decreases, creating a negative pressure. Under atmospheric pressure, the external gas pushes open the intake valve plate and enters the cylinder liner 10 through the intake valve orifice, completing the intake process. Cooling water flowing into the water jacket 9 enters from the inlet and flows within the annular channel between the water jacket 9 and the cylinder liner 10, absorbing the heat generated by the compressed gas from the piston ring 16 and the heat generated by the friction between the piston ring 16 and the cylinder liner 10, thus maintaining the operating temperature of the cylinder liner 10 within a reasonable range of 80-120℃. After absorbing heat, the cooling water flows out from the outlet, is cooled by an external cooling device, and is then recycled. The intake and exhaust valves on valve plate 18 adopt a one-way valve structure to ensure that the gas can only flow in one direction, ensuring the normal operation of the compression process. The valve plate is made of high-strength stainless steel sheet, which has good elasticity and fatigue resistance, and a long service life.

[0042] Reference Figure 2 , Figure 13 The drive structure includes a motor 14, the output end of which is fixedly connected to the bottom end of the eccentric spindle 1, and the top of the motor 14 is fixedly mounted on the bottom of the lower bearing mounting plate 2.

[0043] Specifically, a motor mounting slot is provided at the bottom of the lower bearing mounting plate 2. The housing of the motor 14 is fixed in the mounting slot by four evenly distributed bolts. The output shaft of the motor 14 is interference-fitted with the bottom shaft hole of the eccentric main shaft 1 through a flexible coupling. A 2-3mm axial clearance is left between the end face of the output shaft and the bottom of the shaft hole to prevent jamming due to thermal expansion during operation. The motor 14 is a three-phase asynchronous motor, and its rated power is matched according to the compressor displacement to meet the requirements of different working conditions. When the motor 14 is running, the output shaft drives the eccentric main shaft 1 to rotate synchronously. Through the eccentric design of the eccentric main shaft 1, the rotational motion is converted into the reverse rotation of the double cam 13 and the reciprocating motion of the guide rod 4.

[0044] Reference Figures 2-12 A lower spindle bearing 8 is installed between the eccentric spindle 1 and the lower bearing mounting plate 2, and an upper spindle bearing 15 is installed between the eccentric wheel 22 and the upper bearing mounting plate 6. A double cam inner bearing 20 is installed between the eccentric spindle 1 and the double cam 13, and a double cam outer bearing 19 is installed between the double cam 13 and the guide rod 4.

[0045] Specifically, a lower bearing 8 is installed between the eccentric spindle 1 and the lower bearing mounting plate 2, and an upper bearing 15 is installed between the eccentric wheel 22 and the upper bearing mounting plate 6. The eccentric spindle 1 and the eccentric wheel 22 are fixedly connected, thus supporting the rotational structure of the eccentric spindle through the two bearings. This achieves stable support for the eccentric spindle during rotation, reduces radial wobble during rotation, and ensures coaxial rotation of the eccentric spindle and the eccentric wheel. A double cam inner bearing 20 is installed between the double cam 13 and the eccentric spindle 1, and a double cam outer bearing 19 is installed between the double cam 13 and the guide rod 4. Utilizing the rolling friction characteristics of the bearings, the motion resistance between the double cam 13 and the eccentric spindle 1 and the guide rod 4 is reduced, ensuring that the double cam 13 can smoothly rotate in the opposite direction under the drive of the eccentric spindle 1 and smoothly transmit the motion to the guide rod 4.

[0046] Reference Figures 1-5 , Figure 13 An upper balance block 21 is installed on one side of the outer wall of the eccentric spindle 1, and the upper balance block 21 is located between the double cam 13 and the eccentric wheel 22. A lower balance block 12 is installed on the other side of the outer wall of the eccentric spindle 1, and the lower balance block 12 is located between the double cam 13 and the lower bearing 8 of the spindle. A counterweight 7 is installed on the top of the eccentric spindle 1, and the counterweight 7 is fan-shaped.

[0047] Specifically, a balance block 21 is installed on one side of the outer wall of the eccentric spindle 1 between the double cam 13 and the eccentric wheel 22, and a lower balance block 12 is installed on the other side between the double cam 13 and the lower bearing 8 of the spindle. A fan-shaped counterweight 7 is installed on the top. By setting the upper balance block, lower balance block, and counterweight on the eccentric spindle, adjusting the weight and position of the counterweight, and combining the upper and lower balance blocks, the eccentric spindle is dynamically balanced. The centrifugal force generated by the balance block counteracts the unbalanced force when the eccentric spindle rotates, reducing vibration and noise during compressor operation and making the equipment run more smoothly.

[0048] Working principle: During use, the motor 14 is controlled to drive the eccentric spindle 1 to rotate synchronously. The eccentric spindle 1 rotates under the support of the upper bearing 15 and the lower bearing 8 between the upper bearing mounting plate 6 and the lower bearing mounting plate 2. Due to the eccentric design of the eccentric spindle 1, its rotation drives the double cams 13, which are symmetrically arranged on the outer wall, to rotate in the opposite direction relative to the spindle through the inner bearing 20 of the double cams. This allows the two eccentric cylinders of the double cams 13 to achieve a reverse rotation trajectory within the housing 3 that is synchronized with the eccentric movement of the spindle. The reverse rotation of the double cams 13 is transmitted to the guide rod 4 through the outer bearing 19 of the double cams. Since the guide rod linear bearing 5, which is mounted on the outer wall of the guide rod 4, is fixed to the outer wall of the housing 3, the guide rod 4 can only perform reciprocating linear motion along its own axis, thus converting the rotational motion of the double cams 13 into the reciprocating linear motion of the guide rod 4.

[0049] The reciprocating motion of the guide rod 4 drives the piston ring 16 and the ring cover 17 to reciprocate within the cylinder liner 10. When the piston ring 16 moves into the cylinder liner 10, the gas inside the cylinder liner 10 is compressed, and the pressure increases. When the pressure exceeds the opening pressure of the exhaust valve plate on the valve plate 18, the exhaust valve plate bends upward, and the compressed gas is discharged through the exhaust valve hole and the channel between the valve plate 18 and the cylinder head 11. When the piston ring 16 moves outward, the volume inside the cylinder liner 10 increases, the pressure decreases, and a negative pressure is formed. Under the action of atmospheric pressure, the external gas pushes open the intake valve plate and enters the cylinder liner 10 through the intake valve hole, completing the intake process and realizing the compression of the gas.

[0050] Throughout the process, the eccentric wheel 22, fixedly connected to the top of the eccentric spindle 1, rotates synchronously with the spindle. Its eccentricity is consistent with that of the spindle. The eccentric motion of the eccentric wheel 22 complements the eccentric motion of the spindle, ensuring that the fixed end and the support end rotate coaxially during spindle rotation and reducing radial runout of the spindle. Simultaneously, the upper balance block 21, lower balance block 12, and top fan-shaped counterweight 7 on the eccentric spindle 1 are used to dynamically balance the eccentric spindle by adjusting the weight and position of the counterweight 7. The centrifugal force generated by the balance block counteracts the unbalanced force during the rotation of the eccentric spindle, reducing vibration and noise during compressor operation. Furthermore, cooling water flows into the water jacket 9 on the outer wall of the cylinder liner 10. The cooling water flows in from the inlet and circulates in the annular channel between the water jacket 9 and the cylinder liner 10, absorbing the heat generated by the compressed gas from the piston rings 16 and friction with the cylinder liner 10. This keeps the operating temperature of the cylinder liner 10 within a reasonable range. After absorbing heat, the cooling water flows out from the outlet, ensuring stable operation of the compressor.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An eight-cylinder piston compressor, including a housing (3), characterized in that: The top of the housing (3) is fixedly connected to an upper bearing mounting plate (6), and the bottom of the housing (3) is fixedly connected to a lower bearing mounting plate (2). An eccentric main shaft (1) is rotatably connected to the middle of the lower bearing mounting plate (2). A double cam (13) is symmetrically arranged on the outer wall of the eccentric main shaft (1). The double cam (13) includes two eccentric cylinders and a hollow section opened on the two eccentric cylinders. The eccentricity between the axis of the two eccentric cylinders and the axis of the hollow section is equal to the eccentricity of the eccentric main shaft (1). Similarly, the outer wall of the double cam (13) is symmetrically provided with guide rods (4), the outer wall of the guide rods (4) is provided with guide rod linear bearings (5), the outer wall of the guide rod linear bearings (5) is fixedly connected to the outer wall of the housing (3), one end of the guide rods (4) is provided with a piston structure, the bottom end of the eccentric main shaft (1) is fixedly provided with a drive structure, the top of the eccentric main shaft (1) is fixedly connected with an eccentric wheel (22), and the outer wall of the eccentric wheel (22) is rotatably connected to the middle part of the upper bearing mounting plate (6).

2. The eight-cylinder piston compressor according to claim 1, characterized in that: The piston structure includes a piston ring (16), the middle of which is disposed at one end of the guide rod (4), and a ring cap (17) is installed on the side of the piston ring (16) away from the guide rod (4). A cylinder liner (10) is provided on the outer wall of the piston ring (16).

3. The eight-cylinder piston compressor according to claim 2, characterized in that: A water jacket (9) is installed on the outer wall of the cylinder liner (10). One side of the water jacket (9) is installed on the outer wall of the housing (3). A cylinder head (11) is installed on the other side of the water jacket (9). A valve plate (18) is provided between the water jacket (9) and the cylinder head (11).

4. The eight-cylinder piston compressor according to claim 1, characterized in that: The drive structure includes a motor (14), the output end of which is fixedly connected to the bottom end of the eccentric spindle (1), and the top of the motor (14) is fixedly disposed at the bottom of the lower bearing mounting plate (2).

5. The eight-cylinder piston compressor according to claim 1, characterized in that: A lower bearing (8) is installed between the eccentric spindle (1) and the lower bearing mounting plate (2), and an upper bearing (15) is installed between the eccentric wheel (22) and the upper bearing mounting plate (6).

6. The eight-cylinder piston compressor according to claim 1, characterized in that: A double cam inner bearing (20) is installed between the eccentric spindle (1) and the double cam (13), and a double cam outer bearing (19) is installed between the double cam (13) and the guide rod (4).

7. The eight-cylinder piston compressor according to claim 1, characterized in that: An upper balance block (21) is installed on one side of the outer wall of the eccentric spindle (1), and the upper balance block (21) is located between the double cam (13) and the eccentric wheel (22).

8. The eight-cylinder piston compressor according to claim 1, characterized in that: A lower balance block (12) is installed on the other side of the outer wall of the eccentric spindle (1), and the lower balance block (12) is located between the double cam (13) and the lower bearing (8) of the spindle.

9. The eight-cylinder piston compressor according to claim 1, characterized in that: The top of the eccentric spindle (1) is equipped with a counterweight (7), which is fan-shaped.

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