A leading type compressor cylinder electronic oiler and cylinder oiling system

Abstract

The embodiment of the application provides a pilot compressor cylinder electronic oil injector and a cylinder oil injection system, the electronic oil injector comprises an oil injection valve, a pilot valve in communication with an oil inlet channel of the oil injection valve, and a high-speed electromagnetic switch valve for controlling the pilot valve to complete opening and closing actions; the oil inlet channel of the oil injection valve is in communication with an oil tank through a high-pressure oil supply pipeline, an oil outlet of the pilot valve is in communication with the oil tank through an oil return pipeline, and the high-speed electromagnetic switch valve is electrically connected with an ECU electric control unit; the electronic oil injector can accurately control an oil injection time and an oil injection amount through the ECU electric control unit, overcomes the shortcomings of a traditional mechanical oil injector, and provides stable, continuous and quantitative oil injection lubrication for a high-pressure cylinder.

Description

Technical Field

[0001] This utility model relates to the field of compressor lubrication technology, specifically to an electronic oiler and cylinder oiling system for a pilot compressor cylinder. Background Technology

[0002] The lubricator is an important auxiliary device in reciprocating compressors. Its function is to provide a continuous, stable, and metered supply of lubricating oil between the piston and cylinder, and between the piston rod and stuffing box. This reduces the friction between the piston and cylinder, and between the piston rod and stuffing box, and also provides sealing and cooling. The performance of the lubricator directly affects the compressor's service life and efficiency. Reciprocating compressors typically use a mechanical pressure-forced lubrication method. This involves pressurizing the lubricating oil using a plunger pump and then delivering it through high-pressure oil pipes to the lubrication points on the cylinder wall and stuffing box, forming a lubricating oil film. Each lubrication point is equipped with an independent regulating valve to adjust the oil supply according to operating conditions, preventing excessive or insufficient lubrication.

[0003] Literature suggests (Science and Technology Innovation, 2012, No. 010) that approximately 50% of reciprocating compressor failures are caused by poor lubrication. Therefore, analyzing the lubrication mechanism between the piston ring assembly and cylinder liner of a reciprocating compressor, selecting a reasonable lubrication method, and ensuring the formation of a stable lubricating film between the friction pairs are fundamental requirements for ensuring the normal operation of the unit. Pressure lubrication is currently the most widely used lubrication method in industry. Its oil injection volume and injection points can be controlled, and each injection point is supplied with oil by a separate oil pipe.

[0004] The basic principle of pressure lubrication is as follows: Lubrication in pressure lubrication is actually accomplished by the work of the lubricator. The lubricator is essentially a small plunger pump. Its suction (pressure) plunger is usually driven by a cam via a ratchet mechanism or worm gear reducer driven by the compressor crankshaft. Alternatively, it can be equipped with a separate motor and driven by a reducer. The lubricator can directly draw oil from the oil sump and pressurize the lubricating oil onto the injection point on the cylinder. Its oil supply is intermittent; the amount of oil supplied by the lubricator each time can be easily adjusted by regulating the working stroke of the plunger.

[0005] Existing mechanical forced pressure lubrication methods have drawbacks, such as difficulty in controlling the amount of oil injected and the inability to accurately control the timing of oil injection. This is especially true for high-pressure cylinders, where the strength of traditional mechanical lubricators limits the ability to achieve stable, continuous, and quantitative lubrication. Utility Model Content

[0006] In view of this, the embodiments of this utility model provide an electronic oiler for a pilot compressor cylinder and a cylinder oiling system, which can overcome the shortcomings of traditional mechanical oilers and solve the technical problem that existing mechanical oilers cannot provide stable, continuous and quantitative oiling lubrication for high-pressure cylinders.

[0007] This utility model provides an electronic oiler for a pilot-operated compressor cylinder, comprising: A pilot valve includes a pilot valve chamber, a valve core, and a closing spring. The pilot valve chamber has an oil inlet and an oil outlet. The valve core is movably disposed within the pilot valve chamber and can reciprocate towards or away from the oil inlet to close or open the oil inlet. The closing spring is disposed within the pilot valve chamber and is used to apply an elastic force to the valve core to close the oil inlet. The oil injection valve includes an oil injection valve stem cavity, an oil injection pressure cavity, an oil inlet channel, a valve stem, and a return spring. The oil injection pressure cavity is equipped with an oil injection nozzle. The valve stem movably passes through the oil injection valve stem cavity and the oil injection pressure cavity, and can reciprocate towards or away from the oil injection nozzle to close or open the nozzle. The return spring is disposed within the oil injection valve stem cavity and applies an elastic force to the valve stem to close the oil injection nozzle. The oil inlet channel is connected to an external high-pressure oil supply pipeline, and the oil inlet of the pilot valve cavity and the oil injection pressure cavity are both connected to the oil inlet channel. A high-speed electromagnetic switching valve is connected to the pilot valve and is used to control the pilot valve to complete the opening and closing actions.

[0008] Optionally, the high-speed electromagnetic switching valve includes a solenoid valve coil and an armature movably disposed at the center of the solenoid valve coil. Both the solenoid valve coil and the armature are disposed in the pilot valve cavity, and the valve core is drivenly connected to the armature.

[0009] Optionally, the high-speed electromagnetic switching valve, the pilot valve, and the oil injection valve are integrated into the same valve seat to form an oil injector assembly.

[0010] Optionally, the oil nozzle is equipped with an oil discharge check valve.

[0011] Optionally, the oil outlet check valve is a ball valve.

[0012] Meanwhile, this utility model embodiment also provides a cylinder oil injection system, which includes an ECU electronic control unit, an oil tank, a high-pressure oil supply line, a return oil line, and an electronic oil injector for the pilot compressor cylinder as described above; the oil injection nozzle is connected to the oil injection point on the cylinder, the oil inlet channel is connected to the oil tank through the high-pressure oil supply line, and the oil outlet of the pilot valve chamber is connected to the oil tank through the return oil line; The ECU is electrically connected to the high-speed electromagnetic switching valve. The ECU controls the high-speed electromagnetic switching valve to complete the opening and closing actions within one cycle of the cylinder piston movement via a pulse control signal. The timing of the opening and closing actions is controlled by the pulse control signal. The duration of the pulse control signal is set by the ECU.

[0013] Optionally, the ECU electronic control unit monitors the working status of the pilot compressor cylinder electronic lubricator in real time and issues a flow interruption alarm when the flow is interrupted.

[0014] Optionally, it also includes a phase sensor electrically connected to the ECU electronic control unit, the phase sensor being mounted on the compressor flywheel for real-time detection of the piston position within the cylinder.

[0015] The present invention has the following beneficial effects: 1. It can overcome the shortcomings of traditional mechanical lubricators and solve the problem that existing mechanical lubricators cannot provide stable, continuous and quantitative lubrication to high-pressure cylinders; 2. It can precisely control the timing and amount of oil injection through the ECU electronic control unit, and accurately inject oil into the cylinder at the right time and in the right quantity. 3. It can monitor the lubrication status of the cylinder and stuffing box in real time through the ECU electronic control unit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the electronic oiler for the pilot compressor cylinder in an embodiment of the present invention; Figure 2 This is a connection diagram of the cylinder oil injection system in an embodiment of this utility model; Figure 3 A schematic diagram of oil injection control with 100% oil injection volume set. Figure 4 Schematic diagram of oil injection control with 50% oil injection volume set; The numbers in the diagram represent: 1. Valve seat; 2. Pilot valve chamber; 3. Valve core; 4. Valve closing spring; 5. Oil injection valve stem chamber; 6. Oil injection pressure chamber; 7. Oil inlet channel; 8. Valve stem; 9. Return spring; 10. Oil injection nozzle; 11. Oil outlet check valve; 12. Solenoid valve coil; 13. Armature. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 As shown, an embodiment of this utility model provides an electronic oiler for a pilot-operated compressor cylinder. The electronic oiler includes a pilot valve, an oil injection valve, and a high-speed electromagnetic switching valve. The high-speed electromagnetic switching valve, the pilot valve, and the oil injection valve can be integrated into the same valve seat 1 to form an oiler assembly.

[0020] The pilot valve includes a pilot valve chamber 2, a valve core 3, and a closing spring 4. The pilot valve chamber 2 has an oil inlet and an oil outlet. The valve core 3 is movably disposed within the pilot valve chamber 2 and can reciprocate towards or away from the oil inlet to close or open the oil inlet. The closing spring 4 is also disposed within the pilot valve chamber 2 and is used to apply an elastic force to the valve core 3 to close the oil inlet.

[0021] The oil filling valve includes an oil filling valve stem chamber 5, an oil filling pressure chamber 6, an oil inlet channel 7, a valve stem 8, and a return spring 9. The oil filling pressure chamber 6 is equipped with an oil filling nozzle 10. The valve stem 8 is movably inserted into the oil filling valve stem chamber 5 and the oil filling pressure chamber 6, and can reciprocate towards or away from the oil filling nozzle 10 to close or open the nozzle 10. The return spring 9 is located in the oil filling valve stem chamber 5 and applies an elastic force to the valve stem 8 to close the oil filling nozzle 10. The oil inlet channel 7 is connected to an external high-pressure oil supply line, allowing high-pressure lubricating oil to be injected into the oil inlet channel 7 through the high-pressure oil supply line. Both the oil inlet of the pilot valve chamber 2 and the oil injection pressure chamber 6 are connected to the oil inlet channel 7. When the pilot valve is closed, the pressure in the oil injection pressure chamber 6 is greater than the pressure in the oil injection valve stem chamber 5. Under the action of the pressure difference, the valve stem 8 can overcome the elastic force applied by the return spring 9 and move away from the oil injection nozzle 10, thereby opening the oil injection nozzle 10 and allowing high-pressure lubricating oil to be injected into the oil injection point on the cylinder through the oil injection nozzle 10. When the pilot valve is open, high-pressure lubricating oil can enter the pilot valve chamber 2 through the oil inlet, thereby relieving the pressure of the oil injection pressure chamber 6, allowing the valve stem 8 to return to the closed position under the action of the return spring 9, closing the oil injection nozzle 10 and stopping the oil injection. Furthermore, the oil injection nozzle 10 is equipped with an oil outlet check valve 11, preferably a ball valve, which can effectively isolate the high-pressure gas in the cylinder and prevent the high-pressure gas in the cylinder from entering the internal oil circuit of the electronic oil injector.

[0022] The high-speed electromagnetic switching valve is connected to the pilot valve to control the opening and closing of the pilot valve, which in turn controls the timing and quantity of oil injection into the oil injection valve. Depending on the compressor's operating conditions, the high-speed electromagnetic switching valve can be designed as an explosion-proof solenoid valve.

[0023] As an optional reference example, the high-speed electromagnetic switching valve in this embodiment of the present invention includes a solenoid valve coil 12 and an armature 13 movably disposed at the center of the solenoid valve coil 12. Both the solenoid valve coil 12 and the armature 13 are disposed within the pilot valve chamber 2, and the armature 13 is kinetically connected to the valve core 3 of the pilot valve. When the solenoid valve coil 12 is energized, it applies electromagnetic force to the armature 13, and the valve core 3 can move away from the oil inlet under the action of the armature 13 and the pressure difference between the inner and outer sides, thus completing the opening action of the pilot valve. When the solenoid valve coil 12 is de-energized, it no longer applies electromagnetic force to the armature 13, and the valve core 3 can return to the closed position under the action of the closing spring 4, thus completing the closing action of the pilot valve.

[0024] At the same time, such as Figure 2 As shown, this utility model embodiment also provides a cylinder oil injection system, including an ECU electronic control unit, an oil tank, a high-pressure oil supply line, a return oil line, and an electronic oil injector for the pilot compressor cylinder as described above. The oil injection nozzle 10 of the electronic oil injector is connected to the oil injection point on the cylinder for injecting lubricating oil into the injection point; the oil inlet channel 7 is connected to the oil tank via the high-pressure oil supply line to inject high-pressure lubricating oil into the oil inlet channel 7; the oil outlet of the pilot valve chamber 2 is connected to the oil tank via the return oil line, allowing the pilot valve chamber 2 to depressurize to the oil tank via the return oil line, facilitating the opening of the pilot valve.

[0025] The ECU (Electronic Control Unit) is electrically connected to the high-speed solenoid valve. The ECU can control the high-speed solenoid valve to open and close within one cycle of the cylinder piston movement via pulse control signals. The timing of the opening and closing actions is controlled by the pulse control signal, allowing for precise control of the lubrication timing. The duration of the pulse control signal (i.e., the interval between the opening and closing actions) determines the lubrication duration of the lubricator, thus determining the amount of lubricant injected within one piston cycle. Therefore, the lubrication amount of the electronic lubricator can be set by setting the duration of the pulse control signal through the ECU. The ECU can monitor the operating status of the electronic lubricator in real time and issue a flow interruption alarm in case of flow interruption.

[0026] Furthermore, a phase sensor can be installed on the compressor flywheel. This phase sensor is electrically connected to the ECU (Electronic Control Unit) to detect the piston's position within the cylinder in real time. This allows the ECU to control the electronic lubricator for precise lubrication based on the piston's real-time position. Lubrication only begins when the piston reaches the lubrication point, preventing premature lubrication that could cause the lubricating oil injected into the cylinder to be carried away by the airflow generated by the piston's movement.

[0027] Specifically, we will analyze the lubrication method of a horizontal reciprocating compressor as an example. Figure 2 As shown, the compressor cylinder is a double-acting cylinder with a compressor speed of 600 rpm. One cycle of piston movement takes 100 milliseconds, and the piston ring takes 30 milliseconds to pass the oil injection point. The piston ring plays two main roles in the compressor's operation: sealing the gas and scraping and distributing oil during the piston's reciprocating motion. The cylinder cavity is divided into a shaft-side working chamber and a cover-side working chamber. When the piston moves from the cover side to the shaft side, the pressure in the cover-side working chamber is lower (in the intake state), while the pressure in the shaft-side working chamber is relatively higher (in the exhaust state). Under the pressure of the high-pressure gas on the shaft side, the piston ring moves towards the cover side until it comes into contact with the annular end face of the piston ring groove cover. During the piston's movement towards the shaft side, the piston ring scrapes off the lubricating oil from the cylinder's mirror surface as it passes the oil injection point, storing it in the annular groove formed between the piston and the piston ring. Because the number of lubrication points on the cylinder is limited and their positions are fixed, when the piston moves to a position without lubrication points, the lubricating oil stored in the annular groove can be forced out by the piston rings and evenly distributed on the cylinder surface, providing good lubrication for the piston rings and cylinder. This process repeats, and through the scraping and distributing action of the piston rings within the cylinder, a pressure-controlled oil film is formed between the cylinder and piston rings. The stable existence of this oil film ensures good lubrication between the friction pairs, maintaining the unit's smooth operation. However, because traditional mechanical lubricators inject oil at irregular intervals, if the oil is injected too early before the piston rings perform their scraping and distributing actions, the lubricating oil injected into the cylinder will be carried away by the airflow generated by the piston movement, resulting in poor cylinder lubrication and abnormal oil consumption. Furthermore, for high-pressure cylinders, if the injection pressure generated by the mechanical lubricator is lower than the gas pressure inside the cylinder, it will prevent oil from being injected. Traditional mechanical lubricators, due to their structural characteristics and strength limitations, have poor reliability in high-pressure conditions.

[0028] To solve the above problems, the cylinder oil injection system provided in this embodiment of the invention can be used to precisely inject oil into the compressor cylinder at regular intervals and in precise quantities. For example, when the ECU electronic control unit sets the oil injection volume to 100%, such as... Figure 3As shown, the ECU (Electronic Control Unit) sends pulse control signals to the high-speed solenoid valve according to the set 100% fuel injection volume. By controlling the opening and closing time of the high-speed solenoid valve, it controls the opening and closing time of the pilot valve, which in turn controls the opening and closing time of the fuel injection valve. By controlling the opening and closing time and opening duration (i.e., the interval between opening and closing actions) of the fuel injection valve, the fuel injection valve can inject 100% of the fuel volume into the cylinder within one cycle of the cylinder piston's movement, and within 30 milliseconds of the piston ring passing the injection point. Similarly, when the ECU sets a 50% fuel injection volume, as... Figure 4 As shown, the ECU electronic control unit sends a pulse control signal to the high-speed electromagnetic switching valve according to the set 50% oil injection amount. Through this pulse control signal, the oil injection valve is controlled to inject 50% of the oil into the cylinder within one cycle of the cylinder piston movement and within 30 milliseconds when the piston ring moves through the oil injection point.

[0029] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electronic oiler for a pilot-operated compressor cylinder, characterized in that, include: A pilot valve includes a pilot valve chamber, a valve core, and a closing spring. The pilot valve chamber has an oil inlet and an oil outlet. The valve core is movably disposed within the pilot valve chamber and can reciprocate towards or away from the oil inlet to close or open the oil inlet. The closing spring is disposed within the pilot valve chamber and is used to apply an elastic force to the valve core to close the oil inlet. The oil injection valve includes an oil injection valve stem cavity, an oil injection pressure cavity, an oil inlet channel, a valve stem, and a return spring. The oil injection pressure cavity is equipped with an oil injection nozzle. The valve stem movably passes through the oil injection valve stem cavity and the oil injection pressure cavity, and can reciprocate towards or away from the oil injection nozzle to close or open the nozzle. The return spring is disposed within the oil injection valve stem cavity and applies an elastic force to the valve stem to close the oil injection nozzle. The oil inlet channel is connected to an external high-pressure oil supply pipeline, and the oil inlet of the pilot valve cavity and the oil injection pressure cavity are both connected to the oil inlet channel. A high-speed electromagnetic switching valve is connected to the pilot valve and is used to control the pilot valve to complete the opening and closing actions.

2. The pilot-operated compressor cylinder electronic oiler according to claim 1, characterized in that: The high-speed electromagnetic switching valve includes a solenoid valve coil and an armature movably disposed at the center of the solenoid valve coil. Both the solenoid valve coil and the armature are disposed within the pilot valve cavity, and the valve core is throttle-connected to the armature.

3. The pilot-operated compressor cylinder electronic oiler according to claim 1, characterized in that: The high-speed electromagnetic switching valve, the pilot valve, and the oil injection valve are integrated into the same valve seat to form an oil injector assembly.

4. The pilot-operated compressor cylinder electronic oiler according to claim 1, characterized in that: The oil nozzle is equipped with an oil discharge check valve.

5. The pilot-operated compressor cylinder electronic lubricator according to claim 4, characterized in that: The oil outlet check valve is a ball valve.

6. A cylinder oil injection system, characterized in that: It includes an ECU electronic control unit, an oil tank, a high-pressure oil supply line, an oil return line, and an electronic oil injector for the pilot compressor cylinder as described in any one of claims 1-5; the oil injector is connected to the oil injection point on the cylinder, the oil inlet channel is connected to the oil tank through the high-pressure oil supply line, and the oil outlet of the pilot valve chamber is connected to the oil tank through the oil return line; The ECU is electrically connected to the high-speed electromagnetic switching valve. The ECU controls the high-speed electromagnetic switching valve to complete the opening and closing actions within one cycle of the cylinder piston movement via a pulse control signal. The timing of the opening and closing actions is controlled by the pulse control signal. The duration of the pulse control signal is set by the ECU.

7. A cylinder oil injection system according to claim 6, characterized in that: The ECU electronic control unit monitors the working status of the pilot compressor cylinder electronic lubricator in real time and issues a flow interruption alarm when the flow is interrupted.

8. A cylinder oil injection system according to claim 6, characterized in that: It also includes a phase sensor electrically connected to the ECU electronic control unit, the phase sensor being mounted on the compressor flywheel for real-time detection of the piston position within the cylinder.

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