H-shaped oil-free gas compressor

Abstract

The utility model belongs to the technical field of piston type oil-free compressors, and particularly relates to an H-type oil-free gas compressor which comprises a support, a compression main machine, a wind scooper and an electric cabinet, the compression main machine comprises a crankcase, a crankshaft, a connecting rod, a first-stage cylinder, a second-stage cylinder, a third-stage cylinder and a fourth-stage cylinder, and the H-type oil-free gas compressor is characterized in that the crankshaft comprises a front crankshaft, a rear crankshaft and a connecting block; the front crankshaft and the rear crankshaft are connected through a connecting block to form at least two inflection points, and the front crankshaft and the rear crankshaft synchronously rotate by 180 degrees; the first-stage cylinder, the second-stage cylinder, the third-stage cylinder and the fourth-stage cylinder are arranged in an up-down structure, the first-stage cylinder and the second-stage cylinder are located on the lower side, and the third-stage cylinder and the fourth-stage cylinder are located on the upper side. The utility model has the beneficial effects that the H-shaped vertical opposite up-and-down structure is adopted, so that the stress of the whole machine is stable, and the service life of the compressor is prolonged; the full-oil-free structure is particularly suitable for being applied to compression occasions of flammable and explosive gas such as oxygen and hydrogen, safety is good, and the application range is wide.

Description

Technical Field

[0001] This utility model belongs to the technical field of piston-type oil-free compressors, and particularly relates to an H-type fully oil-free gas compressor. Background Technology

[0002] With rapid societal development, high-pressure gases are needed in various fields, including industry, medicine, military, chemicals, and civilian applications. High-pressure gases effectively reduce storage space, reduce pipeline diameter during transportation, and increase transport distance. For example, a 4-liter cylinder filled with 15 MPa gas has a volume of 600 liters at atmospheric pressure; if filled with 20 MPa, it would have a volume of 800 liters at atmospheric pressure. The application of high-pressure gases effectively reduces energy storage costs, inventory costs, and gas transmission costs across various industries. Commonly used high-pressure gases include air, oxygen, nitrogen, helium, neon, argon, and xenon.

[0003] Common oil-free reciprocating compressors (multi-stage) are mostly V-type, W-type, and S-type (sector-shaped). V-type and W-type compressors are often used for medium and high pressure applications, but these structures result in uneven tangential force loads, unstable overall machine stress, and significant vibration during operation. Furthermore, the compressor's power unit experiences large load variations, thus reducing its lifespan. Additionally, the compressors produce relatively high operating noise. Moreover, due to the limited number of cylinders in V-type and W-type compressors, single-acting compressors can only achieve two or three stages of compression, making it difficult to reach high compression pressures.

[0004] Chinese utility model patent application number 201220628749.7 discloses a vertical reciprocating piston nitrogen booster compressor, which mainly includes: a machine body, a crankshaft, connecting rods, crossheads, an oil pump, a cylinder block, pistons, inlet valves, a filter, an electric motor, a rigid coupling, an electric turning gear, an air pipeline system, a buffer, a cooler, and a safety valve. The cylinder block includes a primary cylinder block and a secondary cylinder block, which are cast as two cylinder blocks. The primary and secondary cylinder blocks are mounted vertically on the machine body in parallel. Both the primary and secondary cylinder blocks are lined with ductile iron cylinder liners and equipped with a cooling water cooling mechanism. The crankshaft, which is placed horizontally at the bottom of the machine body, is connected to the four pistons in the respective primary and secondary cylinder blocks through four connecting rods, four crossheads, and four piston rods. One end of the crankshaft is connected to the electric motor by a rigid coupling, and the other end is connected to the oil pump through an overrunning clutch.

[0005] Chinese utility model patent application number 202222258779.X discloses a large vertical piston oxygen compressor with four rows of single-stage compression. It consists of a machine body, crankcase, crankshaft, connecting rod, crosshead, cylinder, piston, oil scraper, seal, intake filter, buffer, cooler, gas and water pipeline system, pipeline valves, safety valve, shaft pump, oil station, electric motor, flywheel coupling, oil vapor suction device, explosion-proof wall, compressor control system, etc.

[0006] All of the above compressors adopt a vertical structure, with the cylinder centerline perpendicular to the ground. Since the piston's working surface does not bear its weight, wear on the cylinder and piston is reduced, improving the working conditions of the piston rings and extending the machine's service life. The load on a vertical compressor primarily generates tensile and compressive stresses on the machine body, resulting in a simpler shape, lighter weight, and resistance to deformation. However, the presence of a lubrication system poses a risk of flammability and explosion when compressing certain gases, such as oxygen and hydrogen, significantly limiting its application. Utility Model Content

[0007] The purpose of this invention is to provide an H-type oil-free gas compressor that overcomes the shortcomings of existing technologies. It adopts a four-stage piston structure to form an oil-free four-stage booster structure. The fourth stage uses a floating piston differential piston structure, where the piston and piston rod only contact each other but are not connected. The vertical structure with upper and lower opposing pistons ensures uniform dynamic load on each piston movement mechanism, stable overall machine force, reduced vibration during operation, and extended service life. The oil-free structure is suitable for the compression of flammable and explosive gases.

[0008] To achieve the above objectives, this utility model employs the following technical solution:

[0009] An H-type oil-free gas compressor includes a support, a compressor main unit, an air guide shroud, and an electrical control box. The compressor main unit includes a crankcase, a crankshaft, connecting rods, a first-stage cylinder, a second-stage cylinder, a third-stage cylinder, and a fourth-stage cylinder, as well as guide pistons and sealing packing assemblies disposed between each stage cylinder and the crankcase. One end of the crankshaft is connected to a motor via a main unit pulley and a belt. The connecting rod is a double-bore connecting rod, with one end connected to the crankshaft via a deep groove ball bearing and the other end connected to the guide piston. The crankshaft includes a front crankshaft, a rear crankshaft, and a connecting block. The front and rear crankshafts are connected by the connecting block to form at least two inflection points, and the front and rear crankshafts rotate synchronously with a 180° phase difference. The first-stage, second-stage, third-stage, and fourth-stage cylinders are arranged in an upper and lower structure, with the first-stage and second-stage cylinders located on the lower side and the third-stage and fourth-stage cylinders located on the upper side.

[0010] Furthermore, the pulley body of the main unit includes a connecting sleeve located at the center, a fan impeller outside the connecting sleeve, and a wheel rim outside the fan impeller, with a belt groove provided on the outer surface of the wheel rim.

[0011] Furthermore, the air guide shroud is equipped with corresponding upper and lower axial flow fans, and a heat sink is installed inside the air guide shroud.

[0012] Furthermore, the first-stage piston rod inside the first-stage cylinder is connected to the first-stage compression piston via threads and is locked in place by fastening bolts.

[0013] Furthermore, in the second-stage and third-stage cylinders, the piston rod and the compression piston are an integral structure.

[0014] Furthermore, the fourth-stage cylinder is equipped with a floating piston.

[0015] Furthermore, the mounting base of the deep groove ball bearing is provided with a grease injection hole one; the flanges of the end caps on both sides of the crankcase are provided with grease injection holes two.

[0016] Furthermore, the main pulley and the motor form a belt reduction mechanism.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1) The oil-free four-stage supercharging structure is constructed using a four-stage piston. The fourth stage adopts a floating piston structure, where the piston and piston rod only contact each other without being connected, which effectively reduces vibration and noise during operation. It also has good coaxiality and low machining difficulty.

[0019] 2) The H-type vertical structure with opposing upper and lower parts ensures uniform dynamic load on each piston movement mechanism, stabilizes the overall machine under stress, and helps extend the service life of the compressor.

[0020] 3) The oil-free structure is particularly suitable for applications involving the compression of flammable and explosive gases such as oxygen and hydrogen. It offers good safety and has a wide range of applications. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0022] Figure 2 This is a front view of an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the main pulley structure in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the crankcase structure in an embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the connection structure between the guide piston cylinder and the compression cylinder in the first-stage cylinder of this utility model embodiment;

[0026] Figure 6 This is a schematic diagram of the floating piston structure in the four-stage cylinder in this embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the connection structure between the piston rod and the compression piston in the second-stage and third-stage cylinders of this utility model embodiment.

[0028] In the diagram: 1-Support, 2-Compressor, 3-Air guide shroud, 4-Electrical control box, 5-Crankcase, 6-Crankshaft, 7-Connecting rod, 8-First stage cylinder, 9-Second stage cylinder, 10-Third stage cylinder, 11-Fourth stage cylinder, 12-Main unit pulley, 13-Deep groove ball bearing, 14-Motor, 15-Pulley cover, 16-Front end cover, 17-Rear end cover, 18-Guide piston, 19-Guide piston cylinder, 20-Piston pin, 2 1-Compression piston, 22-Compression cylinder, 23-Cylinder head, 24-Piston rod, 25-Grease injection hole one, 26-Grease injection hole two, 27-Needle roller bearing, 28-Fastening bolt, 29-Radiator, 31-Upper axial flow fan, 32-Lower axial flow fan, 61-Rear crankshaft, 62-Front crankshaft, 63-Connecting block, 121-Hub, 122-Fan impeller, 123-Wheel rim, 124-Belt groove. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0031] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0032] See Figure 1-2 , Figure 4This is a schematic diagram of an embodiment of an H-type oil-free gas compressor of this utility model, including a support 1, a compressor main unit 2, an air guide shroud 3, and an electrical control box 4. The compressor main unit 2 includes a crankcase 5, a crankshaft 6, a connecting rod 7, a first-stage cylinder 8, a second-stage cylinder 9, a third-stage cylinder 10, a fourth-stage cylinder 11, and guide pistons 18 and sealing packing groups 20 disposed between each stage cylinder and the crankcase 5. One end of the crankshaft 6 is connected to a motor 14 through a main unit pulley 12 and a belt. The connecting rod 7 is a double-hole connecting rod, with one end of the connecting rod 7 connected to the crankshaft 6 through a deep groove ball bearing 13, and the other end of the connecting rod 7 connected to the guide piston 18. The crankshaft 6 includes a rear crankshaft 61 and a front crankshaft 62. 2. The rear crankshaft 61 and the front crankshaft 62 are connected by the connecting block 63 to form at least two inflection points, and the rear crankshaft 61 and the front crankshaft 62 rotate synchronously with a 180° difference. The first-stage cylinder 8, the second-stage cylinder 9, the third-stage cylinder 10 and the fourth-stage cylinder 11 are arranged in an upper and lower structure, with the first-stage cylinder 8 and the second-stage cylinder 9 located on the lower side, and the third-stage cylinder 10 and the fourth-stage cylinder 11 located on the upper side. This unique H-shaped upper and lower opposed vertical structure, through the upper and lower arrangement, offsets the influence of gravity on dynamic balance. It has no additional counterweight, small size and light weight, which can make the dynamic load of each piston cylinder uniform, the whole machine under stable force, and help extend the service life of the compressor.

[0033] See Figure 3 This is a schematic diagram of the main unit pulley structure in an embodiment of the present utility model. The pulley body of the main unit pulley 12 includes a hub 121 located at the center, a fan impeller 122 on the outside of the hub 121, and a rim 123 on the outside of the fan impeller 122. The outer surface of the rim 123 is provided with a belt groove 124. This structure allows the main unit pulley 12 to function as both a pulley and a fan, thereby increasing the heat dissipation effect on the compressor main unit 2.

[0034] The air guide shroud 3 corresponds to the inner side of the upper axial flow fan 31 and the lower axial flow fan 32. The air guide shroud 3 is equipped with a radiator 29, and the two fans can respectively cool the upper and lower sets of compression cylinders. The main pulley 12 and the motor 14 form a belt reduction mechanism. The belt reduction mechanism is covered by a wheel cover 15 for protection.

[0035] The mounting base of the deep groove ball bearing 13 is provided with a grease injection hole 25, and the crankcase 5 opposite the grease injection hole 25 is provided with a corresponding oil plug; the flanges of the end caps (front end cap 16 and rear end cap 17) at both ends of the crankcase 5 are respectively provided with grease injection holes 26, which can realize maintenance work outside the crankcase.

[0036] See Figure 5This is a schematic diagram of the connection structure between the guide piston cylinder and the compression cylinder in the first-stage cylinder of this utility model embodiment. The guide piston 18 is located in the guide piston cylinder 19. The guide piston 18 is constrained to reciprocate linearly by friction with the guide piston cylinder 19 through a guide ring. The guide piston cylinder 19 is connected upward to the sealing packing assembly 20, which is connected upward to the compression cylinder 22. The compression cylinder 22 is connected to the cylinder head 23. The other end of the connecting rod 7 is connected to the piston pin through the needle roller bearing 27, and the piston pin is connected to the guide piston 19. The guide piston is connected to the piston rod 24, and the piston rod 24 is connected to the compression piston 21 in the compression cylinder 22 through fastening bolts 28. Each stage of the compression cylinder is connected to its respective cylinder head 23.

[0037] See Figure 6 The fourth-stage cylinder 11 is equipped with a floating piston that floats on top of the fourth-stage piston rod. In this structure, the high-pressure stage piston remains free and there is no mechanical connection between it and the piston rod. Using a floating piston structure in the high-pressure stage, when the compressor starts up and begins normal operation, the high-pressure stage floating piston is pressed against the piston rod by the force of the gas and moves synchronously with the lower piston rod to complete the gas compression process. Because the high-pressure stage floating piston remains free and there is no mechanical connection between it and the piston rod, the problem of piston wear is effectively reduced, providing significant convenience for processing and assembly. This embodiment of the invention, by using a four-stage piston to construct an oil-free four-stage booster structure, effectively reduces vibration and noise during operation, and offers good coaxiality and low processing difficulty. The completely oil-free structure is particularly suitable for applications involving the compression of flammable and explosive gases such as oxygen and hydrogen.

[0038] See Figure 7 In the embodiments of this utility model, in the second-stage cylinder 9 and the third-stage cylinder 10, the piston rod 24 and the compression piston 21 are an integral structure.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An H-type oil-free gas compressor, comprising a support, a compressor main unit, an air guide shroud, and an electrical control box; the compressor main unit includes a crankcase, a crankshaft, a connecting rod, a first-stage cylinder, a second-stage cylinder, a third-stage cylinder, a fourth-stage cylinder, and guide pistons and sealing packing assemblies disposed between each stage cylinder and the crankcase; one end of the crankshaft is connected to a motor via a main unit pulley and a belt; the connecting rod is a double-bore connecting rod, one end of the connecting rod is connected to the crankshaft via a deep groove ball bearing, and the other end of the connecting rod is connected to the guide piston; characterized in that, The crankshaft includes a front crankshaft, a rear crankshaft, and a connecting block. The front crankshaft and the rear crankshaft are connected by the connecting block to form at least two inflection points. The front crankshaft and the rear crankshaft rotate synchronously with a 180° difference in phase. The first-stage cylinder, the second-stage cylinder, the third-stage cylinder, and the fourth-stage cylinder are arranged in an upper and lower structure, with the first-stage cylinder and the second-stage cylinder located on the lower side and the third-stage cylinder and the fourth-stage cylinder located on the upper side.

2. The H-type oil-free gas compressor according to claim 1, characterized in that, The pulley of the main unit includes a hub located at the center, a fan impeller outside the hub, and a rim outside the fan impeller, with a belt groove on the outer surface of the rim.

3. The H-type oil-free gas compressor according to claim 1, characterized in that, The air guide shroud is equipped with corresponding upper and lower axial flow fans, and a heat sink is installed inside the air guide shroud.

4. The H-type oil-free gas compressor according to claim 1, characterized in that, The first-stage piston rod inside the first-stage cylinder is connected to the first-stage compression piston by threads and is locked in place by fastening bolts.

5. The H-type oil-free gas compressor according to claim 1, characterized in that, In the second-stage and third-stage cylinders, the piston rod and the compression piston are an integral structure.

6. The H-type oil-free gas compressor according to claim 1, characterized in that, The fourth-stage cylinder is equipped with a floating piston.

7. The H-type oil-free gas compressor according to claim 1, characterized in that, The mounting base of the deep groove ball bearing is provided with a grease injection hole one; the flanges of the end caps on both sides of the crankcase are provided with grease injection holes two.

8. The H-type oil-free gas compressor according to claim 1, characterized in that, The main pulley and the motor together form a belt reduction mechanism.

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