Lubricating device of air compressor

Abstract

The utility model belongs to the technical field of air compressors and discloses an air compressor lubricating device. A gear oil pump is communicated with the bottom of the side face of an oil pool through an oil suction pipe, and the other end of the gear oil pump is connected with an overpressure valve through an oil pipe; the other end of the overpressure valve is communicated with a first branch and a second branch, the first branch comprises a first oil supply pipe and a crankcase, the first oil supply pipe is communicated with a bearing seat oil hole in one end of the crankcase, the second branch comprises a second oil supply pipe and an oil injector, and the second oil supply pipe is communicated with the oil injector. And the other end of the oil injector is communicated with the high-pressure cylinder through a high-pressure cylinder lubricating oil pipe. The overpressure valve is additionally arranged on the oil return pipeline of the plunger pump, so that the pressure of a lubricating system is obviously increased, the oil pressure of the lubricating system of the air compressor tends to increase along with the reduction of a throttling aperture, and the oil pressure of an outlet of a gear oil pump and the oil pressure of the tail end of a lubricating oil circuit tends to increase; an overpressure valve is additionally arranged on the downstream of a lubricating oil pipeline, so that the oil pressure of the air compressor lubricating system is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of air compressors, and in particular relates to a lubricating device for an air compressor. Background Art

[0002] As a key power device, air compressors play an indispensable role in industrial production. Their efficient and stable operation relies on the coordinated work of multiple subsystems, of which the lubrication system is particularly critical. The lubrication system's primary function is to reduce friction and wear between mechanical components, prevent overheating, and ensure long-term, stable operation of the air compressor.

[0003] The pressure of the lubrication system will decrease as the temperature of the lubricating oil increases. The main reason is that as the temperature of the lubricating oil increases, the viscosity of the lubricating oil decreases, and the amount of oil returned from the gap between the moving parts and the return oil pipe increases, which directly leads to a decrease in pressure head loss and ultimately causes an overall decrease in the oil pressure of the lubrication system.

[0004] The reduction in oil pressure can prevent the lubricant from reaching the bearing surface, or even if the lubricant has reached the bearing surface, the viscosity is too low to form a thick enough oil film. At the same time, after the lubrication efficiency is reduced, the unit temperature rises, causing the lubricant to break down due to overheating even though it has reached the bearing surface, thus failing to lubricate, thus creating a vicious cycle.

[0005] Reliable operation of an air compressor requires increasing the oil pressure in the lubrication system. Traditional methods include replacing the gear oil pump with a higher-lift gear oil pump to increase the lubrication system pressure, or using a larger-diameter lubricating oil line. However, both of these methods inevitably require changes to the air compressor system design. For an established air compressor lubrication system, these two methods, while theoretically feasible, are not practical.

[0006] To ensure proper operation of an oil-fired air compressor, the compressor's crankshaft bearings, crank-connecting rod mechanism, piston and cylinder moving parts must be adequately lubricated. Otherwise, serious accidents such as bearing seizure and cylinder scuffing can occur. Therefore, when designing the lubricating oil system, it is crucial to ensure that the lubricating oil circuit is unobstructed and the oil pressure is normal (generally 0.11 to 0.22 MPa). After assembly of the moving parts, the compressor oil circuit must be tested for flow using specialized equipment. Oil pressure is generally related to the gear pump's displacement, clearances between moving parts, and the seals at the oil line connections. When these conditions are met, oil pressure depends on the properties of the lubricant itself. Since lubricant viscosity decreases with increasing temperature, this can lead to a drop in oil pressure and poor lubrication of the moving parts. At room temperature, oil pressure builds quickly after startup, allowing the compressor to start normally. However, after a period of operation, the oil temperature rises, the lubricant viscosity decreases, and the oil pressure drops rapidly. In some cases, the oil pressure may fall below the specified minimum value (0.1 MPa), causing the compressor to automatically shut down.

[0007] Through the above analysis, the problems and defects of the existing technology are: the traditional pressurization method of the air compressor lubrication system requires changing the system design of the air compressor and is not suitable for the established air compressor lubrication system. Utility Model Content

[0008] In order to overcome the problems existing in the related art, the disclosed embodiment of the utility model provides an air compressor lubrication device.

[0009] The technical solution of the utility model is as follows: an air compressor lubrication device includes an oil pool and a gear oil pump, the gear oil pump is connected to the bottom of the side of the oil pool through an oil suction pipe, and the other end of the gear oil pump is connected to an overpressure valve through an oil pipe;

[0010] The other end of the overpressure valve is connected to a first branch and a second branch, the first branch includes a first oil supply pipe and a crankcase, the first oil supply pipe is connected to the bearing seat oil hole at one end of the crankcase, the second branch includes a second oil supply pipe and an oiler, the second oil supply pipe is connected to the oiler, and the other end of the oiler is connected to the high-pressure stage cylinder through a high-pressure cylinder lubricating oil pipe.

[0011] In one embodiment, an oil filter connected to one end of the oil suction pipe is installed at the bottom of the inner side of the oil pool.

[0012] In one embodiment, the other end of the crankcase is connected to an oil return pressure gauge and a pressure switch, and the other end of the crankcase is located on the upper side of the oil pool.

[0013] In one embodiment, the side of the overpressure valve is further connected to an overpressure valve oil return pipe, and the other end of the overpressure valve oil return pipe is connected to the upper end of the oil pool.

[0014] In one embodiment, the oil pipe between the gear oil pump and the overpressure valve is connected to an oil inlet pressure gauge.

[0015] Combining all the above technical solutions, the beneficial effects of the present invention are as follows:

[0016] The utility model significantly increases the pressure of the lubrication system by adding an overpressure valve to the oil return pipeline of the plunger pump. As the throttle aperture decreases, the oil pressure of the air compressor lubrication system tends to increase, and the oil pressure at both the gear oil pump outlet and the end of the lubrication oil circuit tends to increase.

[0017] In the lubrication system, throttling the return oil from the lubricator is an effective means of maintaining oil pressure. A flow-limiting device must be installed on the return oil line of the lubricator to limit the amount of oil returning and maintain lubricating oil pressure. This prevents the potential operational risk of a rapid drop in lubricating oil pressure caused by a large amount of lubricating oil leaking from the main oil line. Over time, this can lead to increased oil temperature, decreased viscosity, and further increased oil leakage. The present utility model increases the oil pressure in the air compressor lubrication system by installing an overpressure valve downstream of the lubricating oil line.

[0018] The utility model realizes the increase of system pressure by installing an overpressure valve in the oil return pipeline of the plunger pump.

[0019] The utility model effectively adjusts the oil pressure at the end of the lubricating oil circuit by adding an overpressure valve to the oil return pipeline of the plunger pump.

[0020] The utility model enables the equipment to automatically increase the opening of the overpressure valve when the oil pressure is high, increase the amount of oil released back to the oil pool, and relieve the overpressure; when the oil pressure is low, the opening of the overpressure valve automatically decreases, and reduce the amount of oil released back to the oil pool, preventing the oil pressure from continuing to drop and causing shutdown.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Figure 1 This is a schematic structural diagram of an air compressor lubrication device provided by an embodiment of the utility model;

[0024] In the figure: 1. Crank-connecting rod mechanism; 2. Crankcase; 3. Oil sump; 4. Oil filter; 5. Overpressure valve return oil pipe; 6. Oil suction pipe; 7. First oil supply pipe; 8. Gear oil pump; 9. Oil inlet pressure gauge; 10. Oil return line; 11. Overpressure valve; 12. Second oil supply pipe; 13. Oil injector; 14. High-pressure cylinder lubricating oil pipe; 15. Oil return pressure gauge; 16. Oil pressure switch. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] like Figure 1 As shown, the air compressor lubrication device provided by the embodiment of the present invention includes an oil pool 3 and a gear oil pump 8, the gear oil pump 8 is connected to the bottom of the side of the oil pool 3 through an oil suction pipe 6, and the other end of the gear oil pump 8 is connected to an overpressure valve 11 through an oil pipe; the other end of the overpressure valve 11 is connected to a first branch and a second branch, the first branch includes a first oil supply pipe 7 and a crankcase 2, the first oil supply pipe 7 is connected to the bearing seat oil hole at one end of the crankcase 2, the second branch includes a second oil supply pipe 12 and an oiler 13, the second oil supply pipe 12 is connected to the oiler 13, and the other end of the oiler 13 is connected to the high-pressure stage cylinder through a high-pressure cylinder lubricating oil pipe 14.

[0027] Preferably, an oil filter 4 is installed at the bottom of the oil sump 3 in the embodiment of the present invention, connected to one end of the oil suction pipe 6. This installation effectively filters out impurities and particulate matter from the sump 3, ensuring clean oil entering the gear pump 8. This prevents damage to the gear pump 8 caused by abrasion due to impurities, while also improving the reliability and durability of the lubrication system. Furthermore, clean oil better lubricates mechanical components, reducing friction and wear, and extending the service life of the equipment.

[0028] Preferably, an oil return pressure gauge 15 and a pressure switch 16 are connected to the other end of the crankcase 2 in this embodiment, which is located above the oil sump 3. The oil return pressure gauge 15 monitors the oil pressure within the crankcase 2 in real time, helping operators understand the operating status of the lubrication system. The pressure switch automatically triggers an alarm or initiates protective measures, such as shutting down the equipment, when oil pressure is abnormal, thereby preventing equipment damage or accidents caused by insufficient or excessive oil pressure, thereby enhancing the safety and maintainability of the lubrication system.

[0029] Preferably, the overpressure valve 11 in the embodiment of the present invention is also connected to an overpressure valve return pipe 5 on the side, the other end of which is connected to the upper end of the oil pool 3. This connection to the overpressure valve 11 allows excess oil to flow back into the oil pool 3 during overpressure, thus avoiding oil waste and environmental pollution. It also helps maintain stable oil pressure in the lubrication system, preventing damage to equipment due to excessive oil pressure. The overpressure valve return pipe 5 also serves as an oil drain during system commissioning and maintenance, facilitating oil replacement and cleaning.

[0030] Preferably, the oil pipe between the gear oil pump 8 and the overpressure valve 11 in the embodiment of the present invention is connected to an oil inlet pressure gauge 9. The oil inlet pressure gauge 9 can monitor the oil pressure entering the lubrication system in real time, making it easier for operators to adjust equipment parameters or perform maintenance in a timely manner, ensuring that the lubrication system is always in optimal working condition.

[0031] The working principle of the present invention is as follows: the gear oil pump 8 draws lubricating oil from the oil reservoir 3 into the lubrication system. The pressure in the lubricating system is determined by the pressure at the outlet of the gear oil pump 8. This suction force directly affects whether the system lubricating oil can circulate smoothly throughout the entire system. Therefore, the gear oil pump 8 plays a vital role in the entire lubrication system. The gear oil pump 8 pressurizes the lubricating oil and feeds it into the overpressure valve 11. The overpressure valve 11 divides the lubricating oil into two paths. One path enters the crankcase 2 and the bearing seat oil holes, passes through the oil pipe (oil hole), and lubricates the bearings, the crank-connecting rod mechanism 1, the low-pressure stage (I and II) piston (rings), and the cylinder. After completing its function, it returns to the oil reservoir 3 through another bearing seat oil return hole and oil scraper ring. The other path enters the oil injector 13, pressurizes it, and enters the high-pressure stage cylinder through the high-pressure cylinder lubricating oil pipe 14 to lubricate the cylinder and piston (rings). This portion of oil is discharged along with the compressed air and represents the main fuel consumption of the air compressor.

[0032] An overpressure valve 11 is installed on the oil return line 10 of the lubricator 13 to limit the amount of oil returning and maintain lubricating oil pressure. The oil return port can even be "blocked" because the oil inlet of the lubricator 13 is connected to the worm gear transmission box. To maintain the oil pressure within the normal range (0.11-0.22 MPa), an overpressure valve 11 is installed at the outlet of the gear oil pump 8. When the oil pressure is high, the overpressure valve 11 automatically opens wider, increasing the amount of oil released back into the oil reservoir 3 and preventing overpressure. When the pressure is low, the overpressure valve 11 automatically opens narrower, reducing the amount of oil released back into the oil reservoir 3 and preventing further drop in oil pressure. To ensure adequate lubrication of moving parts and improve the reliability and safety of the air compressor, a return oil pressure gauge 15 and a pressure switch 16 are installed on the return oil bearing seat to monitor the lubricating oil pressure and provide oil pressure protection. This lubrication point is the end of the lubricating oil circuit, and the pressure value should be the lowest in the system. Therefore, as long as lubrication is adequate here, all moving parts will also be fully lubricated. When the lubricating oil pressure drops below 0.11 MPa, the oil pressure switch 16 is activated, and the electric control box automatically shuts down the machine, ensuring that the lubrication pair is not damaged. The oil filter 4 is placed at the inlet of the gear oil pump 8. Its function is to filter impurities in the lubricating oil, ensuring that clean lubricating oil enters the lubrication device and preventing impurities from entering the air compressor crankshaft drive and causing wear.

[0033] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] The above description is only a preferred specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. An air compressor lubrication device, comprising an oil pool (3) and a gear oil pump (8), wherein the gear oil pump (8) is connected to the bottom of the side of the oil pool (3) through an oil suction pipe (6), characterized in that: The other end of the gear oil pump (8) is connected to an overpressure valve (11) via an oil pipe; The other end of the overpressure valve (11) is connected to a first branch and a second branch, the first branch comprising a first oil supply pipe (7) and a crankcase (2), the first oil supply pipe (7) being connected to a bearing seat oil hole at one end of the crankcase (2), the second branch comprising a second oil supply pipe (12) and an oil injector (13), the second oil supply pipe (12) being connected to the oil injector (13), the other end of the oil injector (13) being connected to a high-pressure stage cylinder via a high-pressure cylinder lubricating oil pipe (14).

2. The air compressor lubrication device according to claim 1, characterized in that: An oil filter (4) connected to one end of an oil suction pipe (6) is installed at the bottom of the inner side of the oil pool (3).

3. The air compressor lubrication device according to claim 1, characterized in that: The other end of the crankcase (2) is connected to an oil return pressure gauge (15) and a pressure switch (16), and the other end of the crankcase (2) is located on the upper side of the oil pool (3).

4. The air compressor lubrication device according to claim 1, characterized in that: The side of the overpressure valve (11) is also connected to an overpressure valve oil return pipe (5), and the other end of the overpressure valve oil return pipe (5) is connected to the upper end of the oil pool (3).

5. The air compressor lubrication device according to claim 1, characterized in that: The oil pipe between the gear oil pump (8) and the overpressure valve (11) is connected to an oil inlet pressure gauge (9).

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