Reciprocating piston compressor lubricating oil control system

Abstract

This utility model discloses a reciprocating piston compressor lubrication oil control system, relating to the technical field of compressor lubrication oil system structure and the technical field of electromechanical equipment maintenance. It includes an auxiliary oil station and a shaft pump, with the auxiliary oil station and shaft pump connected in parallel in the lubrication oil circuit. The auxiliary oil station includes an oil tank, an oil pump, and a filter device. The shaft pump is linked to the compressor's main motor via a crankshaft transmission mechanism. This reciprocating piston compressor lubrication oil control system automates the entire process of start-up, operation, and shutdown. It can delay the start / stop of the main motor after the oil temperature / pressure reaches the target level. Under abnormal operating conditions, it allows seamless switching between the two pumps to maintain stable oil pressure. Combined with safety mechanisms such as a one-way valve to prevent backflow and a safety valve for pressure relief, it effectively avoids wear of moving parts caused by human error, reduces maintenance costs, adapts to complex operating conditions such as frequency conversion, and improves the reliability and stability of equipment operation.

Description

Technical Field

[0001] This utility model specifically relates to a lubricating oil control system for a reciprocating piston compressor, belonging to the technical field of compressor lubricating oil system structure. Background Technology

[0002] In modern industrial production, reciprocating piston compressors are key pieces of equipment, widely used in many fields such as chemical, petroleum, and metallurgy. Their lubrication system is crucial for ensuring stable operation and extending the compressor's service life.

[0003] Most existing reciprocating piston compressors use a single oil pump for lubrication. During compressor startup, the equipment needs to overcome significant static friction, requiring high pressure and flow rates for the lubricating oil. A single oil pump cannot quickly establish sufficient oil pressure, resulting in inadequate lubrication of moving parts in the initial startup phase, thus exacerbating wear. During shutdown, the oil pump stops working, interrupting the lubrication supply. However, some compressor components may continue to operate due to inertia. Without lubrication protection, these components are also prone to wear.

[0004] When a compressor uses variable frequency speed control, its rotational speed changes, and the oil pump's oil delivery rate also changes accordingly. This makes it difficult to accurately match the lubrication requirements of the compressor at different speeds, leading to insufficient oil pressure or uneven oil distribution. For example, when the speed decreases, the oil pump's oil delivery rate decreases, which may result in insufficient oil supply to some critical lubrication points; when the speed increases, if the oil pump's oil supply capacity is limited, it will also be unable to meet the equipment's lubrication oil requirements.

[0005] Traditional solutions to these problems primarily rely on manual operation. Operators must judge the operating status of the lubrication system based on experience and manually adjust the oil pump's operating parameters or take corresponding measures. However, this approach has many drawbacks. On the one hand, manual operation suffers from response lag, making it difficult to respond promptly to unexpected situations during system operation, such as a sudden drop in oil pressure. On the other hand, operators may make mistakes due to fatigue or negligence, further affecting the normal operation of the lubrication system. Moreover, traditional solutions cannot monitor and dynamically adjust the pressure and temperature of the lubrication oil in real time. Without real-time access to lubrication oil pressure and temperature data, potential system anomalies cannot be detected in time, and precise control of the lubrication system based on actual operating conditions is impossible. This leaves the compressor in a state of unstable lubrication for extended periods, severely impacting equipment reliability and lifespan.

[0006] Therefore, there is an urgent need for a more advanced, intelligent, and reliable lubricating oil control system to solve the aforementioned problems of existing reciprocating piston compressor lubricating oil systems and meet the demands of modern industrial production for efficient and stable equipment operation. Utility Model Content

[0007] The present invention achieves the above objectives through the following technical solution: a reciprocating piston compressor lubricating oil control system, including an auxiliary oil station and a shaft head pump. The auxiliary oil station and the shaft head pump are connected in parallel in the lubricating oil circuit. The auxiliary oil station includes an oil tank, an oil pump, and a filter device. The shaft head pump is linked to the compressor main motor through a crankshaft transmission mechanism.

[0008] The oil pressure detection module and the oil temperature detection module are respectively installed in the main oil circuit of the lubrication oil circuit, and the detection points include the auxiliary oil station outlet, the shaft head pump outlet and the compressor lubrication point;

[0009] The control system includes a PLC control cabinet and a manual button control module. The input terminals of the PLC control cabinet are electrically connected to the oil pressure detection module and the oil temperature detection module, respectively. The output terminals of the PLC control cabinet are electrically connected to the control circuits of the auxiliary oil station motor and the compressor main motor, respectively.

[0010] Preferably, the lubrication circuit is provided with a first check valve and a second check valve. The first check valve is located in the outlet pipe of the auxiliary oil station, and the second check valve is located in the outlet pipe of the shaft pump. The conduction direction of both the first check valve and the second check valve is towards the compressor lubrication point.

[0011] Preferably, the oil pressure detection module includes a pressure sensor and a pressure switch. The signal output terminal of the pressure sensor is connected to the analog input interface of the PLC control cabinet, and the contact output terminal of the pressure switch is connected to the digital input interface of the PLC control cabinet.

[0012] Preferably, the oil temperature detection module includes a temperature sensor and a temperature transmitter. The temperature sensor is installed in the lubricating oil circuit, and the input end of the temperature transmitter is connected to the temperature sensor, while the output end is connected to the analog input interface of the PLC control cabinet.

[0013] Preferably, the output terminal of the PLC control cabinet is connected to the contactor coils of the auxiliary oil station motor and the compressor main motor respectively through a relay control circuit, and the relay control circuit includes an intermediate relay and a time relay.

[0014] Preferably, the manual button control module includes a start button, a stop button, and a mode switching switch. The contacts of the start button and the stop button are connected in series in the control circuit of the auxiliary oil station motor, and the mode switching switch is used to select manual control mode or automatic control mode.

[0015] Preferably, the lubrication circuit is equipped with a safety valve and a relief valve. The inlet of the safety valve is connected to the main oil circuit, and the outlet is connected to the oil reservoir. The relief valve is installed on the outlet pipe of the auxiliary oil station.

[0016] Preferably, the control system further includes an alarm device, which includes an audible and visual alarm and a remote communication module. The audible and visual alarm is connected to the digital output interface of the PLC control cabinet, and the remote communication module is connected to the PLC control cabinet via an RS485 or Ethernet interface.

[0017] The beneficial effects of this utility model are as follows: The lubricating oil control system for the reciprocating piston compressor achieves full automation of the start-up, operation, and shutdown process through the parallel design of the auxiliary oil station and the shaft pump, the dual control modes of PLC and manual operation, and multiple detection and protection modules. It can delay the start and stop of the main motor after the oil temperature / pressure reaches the standard, and seamlessly switch between the two pumps to maintain stable oil pressure under abnormal operating conditions. With the addition of safety mechanisms such as one-way valve to prevent backflow and safety valve to relieve pressure, it effectively avoids wear of moving parts caused by human operation errors, reduces maintenance costs, adapts to complex operating conditions such as frequency conversion, and improves the reliability and stability of equipment operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall control system of this utility model;

[0019] Figure 2 This is a logic diagram of the control system of this utility model during operation;

[0020] Figure 3 This is a logic diagram of the control system hardware of this utility model;

[0021] Figure 4 This is the logic diagram for the hydraulic control of this utility model; Detailed Implementation

[0022] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-4 As shown, the auxiliary oil station outlet, i.e., its internal oil storage tank, is connected to the oil pump, filter, and first check valve in sequence through pipelines, and finally connected to the main oil pipe of the lubrication circuit. The oil pump motor is connected to the output terminal of the PLC control cabinet through a contactor. The shaft pump (outlet) is connected to the compressor crankshaft through a coupling. After the outlet is connected to the second check valve, it merges with the auxiliary oil station outlet pipeline in the main oil pipe.

[0024] Pressure sensors are installed at the outlet of the auxiliary oil station, the outlet of the shaft pump, and the main oil pipe. The signal output line is connected to the analog input module of the PLC control cabinet. The pressure switch is connected in parallel to the main oil pipe, and the contact output line is connected to the PLC digital input module. The temperature sensor is installed at the return port of the main oil pipe, and the signal is transmitted to the PLC analog input module through the temperature transmitter.

[0025] The digital input module connects to the pressure switch and manual button, the digital output module controls the auxiliary oil station motor and compressor main motor contactor through the intermediate relay, and the analog input module connects to the pressure sensor and temperature transmitter.

[0026] The start button, stop button, and mode switch in the manual button control module are connected to the PLC input circuit via terminal blocks.

[0027] The safety valve inlet is connected to the main oil pipe, and the outlet is connected to the oil storage tank; the overflow valve is installed on the outlet pipeline of the auxiliary oil station.

[0028] The audible and visual alarm is connected to the digital output terminal of the PLC; the remote communication module is connected to the PLC communication port via an RS485 interface.

[0029] like Figure 2 As shown, after system startup, the first step is to check if the oil temperature and oil pressure meet the standards. If they do, the main motor starts, and the shaft head pump operates in tandem, with the auxiliary oil station and shaft head pump supplying oil simultaneously. If they do not meet the standards, the auxiliary oil station continues to run and triggers an alarm. After the main motor starts, when the main unit speed reaches the standard and stabilizes, the auxiliary oil station is shut down after a 60-second delay, and the shaft head pump enters an independent oil supply state. If the main unit speed does not reach the standard and stabilize, the auxiliary oil station continues to run. During the independent oil supply process of the shaft head pump, if a low pressure alarm occurs, the auxiliary oil station will be restarted to maintain oil pressure. After the speed returns to normal, the auxiliary oil station will be shut down after a 60-second delay. When a shutdown command is received, the auxiliary oil station is started first, the main motor is shut down after a 60-second delay, the auxiliary oil station is shut down after another 60-second delay, and finally the system shuts down. The entire process achieves stable operation and reliable switching of the lubrication system through the monitoring and control of parameters such as oil temperature, oil pressure, and main unit speed.

[0030] like Figure 3 As shown, the PLC control cabinet is located at the core. Its input terminals are connected to the oil pressure detection module and the oil temperature detection module to receive oil pressure and oil temperature data in real time to monitor the lubrication status of the system. The output terminals are connected to multiple components: connected to the manual button module to switch between manual and automatic control; connected to the auxiliary oil station motor to control the operation of the auxiliary oil station; and connected to the compressor main motor to drive the compressor main motor and the linked crankshaft and shaft head pump.

[0031] In addition, the PLC control cabinet is also connected to an audible and visual alarm, which is used to provide on-site audible and visual alarms when the system malfunctions; it is also connected to a remote communication module, which can transmit system operation data and alarm information to a remote monitoring platform for remote monitoring and management, ensuring stable and reliable system operation.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lubricating oil control system for a reciprocating piston compressor, characterized by: include An auxiliary oil station and a shaft head pump are provided. The auxiliary oil station and the shaft head pump are connected in parallel in the lubrication oil circuit. The auxiliary oil station includes an oil tank, an oil pump and a filter device. The shaft head pump is linked to the compressor main motor through a crankshaft transmission mechanism. The oil pressure detection module and the oil temperature detection module are respectively installed in the main oil circuit of the lubrication oil circuit, and the detection points include the auxiliary oil station outlet, the shaft head pump outlet and the compressor lubrication point; The control system includes a PLC control cabinet and a manual button control module. The input terminals of the PLC control cabinet are electrically connected to the oil pressure detection module and the oil temperature detection module, respectively, and the output terminals of the PLC control cabinet are electrically connected to the control circuits of the auxiliary oil station motor and the compressor main motor, respectively.

2. The lubricating oil control system for a reciprocating piston compressor of claim 1, wherein: The lubrication circuit is equipped with a first check valve and a second check valve. The first check valve is located in the outlet pipe of the auxiliary oil station, and the second check valve is located in the outlet pipe of the shaft pump. The conduction direction of both the first check valve and the second check valve is towards the compressor lubrication point.

3. The lubricating oil control system for a reciprocating piston compressor of claim 1, wherein: The oil pressure detection module includes a pressure sensor and a pressure switch. The signal output terminal of the pressure sensor is connected to the analog input interface of the PLC control cabinet, and the contact output terminal of the pressure switch is connected to the digital input interface of the PLC control cabinet.

4. The lubricating oil control system for a reciprocating piston compressor of claim 1, wherein: The oil temperature detection module includes a temperature sensor and a temperature transmitter. The temperature sensor is installed in the lubricating oil circuit. The input end of the temperature transmitter is connected to the temperature sensor, and the output end is connected to the analog input interface of the PLC control cabinet.

5. The lubricating oil control system for a reciprocating piston compressor of claim 1, wherein, The output terminal of the PLC control cabinet is connected to the contactor coils of the auxiliary oil station motor and the compressor main motor respectively through a relay control circuit. The relay control circuit includes an intermediate relay and a time relay.

6. The lubricating oil control system for a reciprocating piston compressor of claim 1, wherein: The manual button control module includes a start button, a stop button, and a mode switch. The contacts of the start button and the stop button are connected in series in the control circuit of the auxiliary oil station motor. The mode switch is used to select manual control mode or automatic control mode.

7. The lubricating oil control system for a reciprocating piston compressor of claim 1, wherein: The lubrication circuit is equipped with a safety valve and a relief valve. The inlet of the safety valve is connected to the main oil circuit, and the outlet is connected to the oil reservoir. The relief valve is located on the outlet pipeline of the auxiliary oil station.

8. The control system according to any one of claims 1-7, characterized in that, The control system also includes an alarm device, which includes an audible and visual alarm and a remote communication module. The audible and visual alarm is connected to the digital output interface of the PLC control cabinet, and the remote communication module is connected to the PLC control cabinet via an RS485 or Ethernet interface.

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