Electrically-controlled oil pressure adjusting system for diaphragm compressor and adjusting method of electrically-controlled oil pressure adjusting system

Abstract

The invention discloses an electronic control oil pressure adjusting system for a diaphragm compressor and an adjusting method of the electronic control oil pressure adjusting system, and relates to the technical field of diaphragm compressors, the system comprises a cylinder body and a cylinder cover installed on the cylinder body, the cylinder cover and the cylinder body are provided with induction structures, and the induction structures are connected with a control structure; the interior of the cylinder body is communicated with the interior of the hydraulic oil cylinder through a first oil pipe, a second oil pipe is fixed to the hydraulic oil cylinder, and an oil inlet is formed in the second oil pipe. Pressure data of the gas film cavity and the oil film cavity are collected in real time through the gas pressure sensor and the oil pressure sensor, the control module can dynamically judge the direction and size of the oil-gas pressure difference in combination with the compressor working phase fed back by the crankshaft phase sensor, and the control strategy is adjusted in real time in the whole operation period; the pressure difference between the oil film cavity and the gas film cavity is stabilized in a set range, the problem of diaphragm fatigue damage caused by response lag of a traditional mechanical regulating valve is avoided, the structure is simple, and the purchase and maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of diaphragm compressor technology, specifically to an electronically controlled oil pressure regulating system and its regulating method for a diaphragm compressor. Background Technology

[0002] As a core piece of equipment in the field of high-pressure gas compression, the pressure balance between the oil film chamber and the gas film chamber of the diaphragm compressor is crucial to ensuring the diaphragm's lifespan and the equipment's stable operation.

[0003] Traditional diaphragm compressors typically use mechanical regulating valves or plunger pump-type oil replenishment systems for their oil pressure regulation.

[0004] However, traditional mechanical control valves rely on the static balance between spring force and hydraulic oil, and cannot sense the dynamic pressure changes in the air film chamber and oil film chamber in real time.

[0005] The plunger pump-type oil replenishment system requires more than ten components such as relief valves, check valves, and mechanical linkages, making its structure complex. Furthermore, the amount of oil replenished by the plunger pump in a single operation is a fixed value and cannot be dynamically adjusted according to the actual leakage.

[0006] Furthermore, existing diaphragm compressors require a reduction in oil pressure when shutting down. However, since hydraulic oil is incompressible, even a small release can cause a rapid drop in oil pressure. At this time, the pressure in the air film chamber is often higher than that in the oil film chamber. Driven by the air pressure difference, the diaphragm strikes the oil-side cylinder, further exacerbating diaphragm damage.

[0007] Based on this, an electronically controlled oil pressure regulating system and its regulating method for diaphragm compressors are provided, which can eliminate the drawbacks of existing systems. Summary of the Invention

[0008] The purpose of this invention is to provide an electronically controlled oil pressure regulating system and its regulating method for diaphragm compressors, so as to solve the problems in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An electronically controlled hydraulic pressure regulating system for a diaphragm compressor includes a cylinder body and a cylinder head mounted on the cylinder body. The cylinder head and cylinder body are equipped with a sensing structure connected to a control structure. The interior of the cylinder body is connected to the interior of a hydraulic cylinder via an oil pipe. A second oil pipe with an oil inlet is fixed to the hydraulic cylinder. An oil drain pipe with an oil drain outlet is fixed to the cylinder body. A solenoid valve is installed on the oil drain pipe and is electrically connected to the control structure. An regulating structure is located inside the hydraulic cylinder and is connected to the control structure.

[0011] Preferably, the sensing structure includes a pneumatic pressure sensor installed at the cylinder head pressure tap and an oil pressure sensor installed at the cylinder block oil film chamber pressure tap. The pneumatic pressure sensor and the oil pressure sensor are electrically connected to the control structure. The pneumatic pressure sensor is used to acquire the pressure of the air film chamber in real time, and the oil pressure sensor is used to acquire the pressure of the oil film chamber in real time.

[0012] Preferably, the control structure includes a control module, which is electrically connected to a pneumatic pressure sensor and an oil pressure sensor, connected to a crankshaft phase sensor, and electrically connected to an adjustment structure.

[0013] Preferably, the adjustment structure includes a driver electrically connected to the control module, the driver being connected to a motor, the output end of the motor extending into the interior of the hydraulic cylinder and fixedly connected to a lead screw, the lead screw being connected to a piston via a rotary joint, and the outer wall of the piston being in contact with the inner wall of the lead screw.

[0014] Preferably, sealing rings are fitted on both the upper and lower sides of the piston's outer wall.

[0015] Preferably, one-way valve one and one-way valve two are respectively installed on oil pipe one and oil pipe two. One-way valve one is used to ensure that hydraulic oil flows from the inside of the hydraulic cylinder through oil pipe one to the oil film chamber inside the cylinder body, and one-way valve two is used to ensure that hydraulic oil flows from the oil inlet through oil pipe two to the inside of the hydraulic cylinder.

[0016] The adjustment method for an electronically controlled hydraulic pressure regulating system for a diaphragm compressor includes the following steps:

[0017] S1: The gear oil pump pumps oil from the oil inlet into the cylinder block; the air pressure sensor monitors the cylinder head air film chamber pressure in real time, and the oil pressure sensor monitors the cylinder block oil film chamber pressure in real time, and transmits the data to the control module.

[0018] S2: The crankshaft phase sensor synchronously feeds back the phase angle of the compressor crankshaft, which is used to dynamically adjust the oil pressure control strategy;

[0019] S3: The control module dynamically adjusts the current oil pressure based on the preset target pressure range, such as the target value of the air film chamber pressure and the target difference between the oil film chamber pressure and the air film chamber pressure, combined with real-time data.

[0020] Preferably, when the oil film chamber pressure in the cylinder block is much lower than the gas film chamber pressure in the cylinder head and the pressure difference between the two exceeds a set threshold, the oil pressure adjustment method under this operating condition includes the following steps:

[0021] S11: The control module combines the signal fed back by the crankshaft phase sensor and sends commands to the driver;

[0022] S12: After receiving the command, the driver drives the motor to rotate forward. The motor drives the lead screw to rotate, pushing the piston into the hydraulic cylinder to compress the hydraulic oil. When the piston moves, the sealing ring ensures that there is no leakage of hydraulic oil.

[0023] S13: Hydraulic oil enters the hydraulic cylinder through check valve 2, and flows to the oil film chamber of the cylinder body through oil pipe 1 and check valve 1 to increase oil pressure.

[0024] Preferably, when the oil film chamber pressure in the cylinder block is much greater than the gas film chamber pressure in the cylinder head and the pressure difference between the two exceeds a set threshold, the oil pressure adjustment method under this operating condition includes the following steps:

[0025] S21: The control module sends an opening command to the solenoid valve, opening the drain port of the drain pipe, and the hydraulic oil is discharged from the oil film chamber of the cylinder through the drain pipe, reducing the oil pressure;

[0026] S22: The control module can drive the motor to reverse, and pull the piston outward through the lead screw to reduce the volume of hydraulic oil in the hydraulic cylinder and assist in pressure reduction.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. This invention uses air pressure sensors and oil pressure sensors to collect real-time pressure data of the air film chamber and oil film chamber. Combined with the compressor operating phase feedback from the crankshaft phase sensor, the control module can dynamically determine the direction and magnitude of the oil-air pressure difference and adjust the control strategy in real time throughout the entire operating cycle to ensure that the pressure difference between the oil film chamber and the air film chamber remains stable within the set range. This avoids the diaphragm fatigue damage problem caused by the response lag of traditional mechanical regulating valves, resulting in a simplified structure and reduced procurement and maintenance costs.

[0029] 2. When the oil film chamber pressure is much lower than the air film chamber pressure, the present invention drives the motor to rotate forward in conjunction with the crankshaft phase, compresses the hydraulic oil through the piston and replenishes it into the oil film chamber through the one-way valve; when the oil film chamber pressure is much higher than the air film chamber pressure, the solenoid valve is opened to release oil, and at the same time the motor is driven to rotate in reverse, reducing the volume of hydraulic oil through the piston, thereby helping to reduce the oil film chamber pressure. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the electronically controlled oil pressure regulating system for the diaphragm compressor of the present invention.

[0031] Figure 2 This is a flowchart of the adjustment method of the electronically controlled oil pressure adjustment system for the diaphragm compressor of the present invention.

[0032] Figure 3 This is a flowchart illustrating the process of the present invention when the oil film chamber pressure in the cylinder block is much smaller than the gas film chamber pressure in the cylinder head, and the pressure difference between the two exceeds a set threshold.

[0033] Figure 4This is a flowchart illustrating the situation where the oil film chamber pressure in the cylinder block is much greater than the air film chamber pressure in the cylinder head, and the pressure difference between the two exceeds a set threshold.

[0034] Figure label annotations: 1. Cylinder head; 2. Cylinder block; 31. Oil pipe one; 41. Check valve one; 32. Oil pipe two; 42. Check valve two; 5. Hydraulic cylinder; 6. Sealing ring; 7. Piston; 8. Lead screw; 9. Motor; 10. Driver; 11. Control module; 12. Air pressure sensor; 13. Oil pressure sensor; 14. Solenoid valve; 15. Crankshaft phase sensor; 16. Oil inlet; 17. Drain pipe; 18. Drain port. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] In one embodiment, such as Figure 1 As shown, an electronically controlled hydraulic pressure regulating system for a diaphragm compressor includes a cylinder body 2 and a cylinder head 1 mounted on the cylinder body 2. The cylinder head 1 and cylinder body 2 are equipped with sensing structures connected to a control structure. The interior of the cylinder body 2 is connected to the interior of a hydraulic cylinder 5 via an oil pipe 31. An oil pipe 32 is fixed to the hydraulic cylinder 5, and an oil inlet 16 is provided on the oil pipe 32. An oil drain pipe 17 is fixed to the cylinder body 2, and an oil drain port 18 is provided on the oil drain pipe 17. A solenoid valve 14 is installed on the oil drain pipe 17 and is electrically connected to the control structure. An regulating structure is provided inside the hydraulic cylinder 5, and the regulating structure is connected to the control structure.

[0038] In this embodiment, during system operation, the sensing structure collects gas pressure data in the gas film chamber of cylinder head 1 and hydraulic oil pressure data in the oil film chamber of cylinder body 2, and transmits the data to the control structure for centralized processing and analysis.

[0039] If the pressure difference between the oil film chamber and the gas film chamber is within the set range, the system maintains the current state and continues to monitor.

[0040] If the pressure difference exceeds the set threshold (e.g., the oil film chamber pressure is much less or much greater than the gas film chamber pressure), the regulation mechanism of the regulating structure will be triggered.

[0041] In an optional embodiment, the sensing structure includes a pneumatic pressure sensor 12 installed at the pressure tap of the cylinder head 1 and an oil pressure sensor 13 installed at the oil film chamber pressure tap of the cylinder block 2. The pneumatic pressure sensor 12 and the oil pressure sensor 13 are electrically connected to the control structure. The pneumatic pressure sensor 12 is used to acquire the pressure of the air film chamber in real time, and the oil pressure sensor 13 is used to acquire the pressure of the oil film chamber in real time.

[0042] It should be noted that the installation positions of the air pressure sensor 12 and the oil pressure sensor 13 are precisely corresponding to the medium environment of the air film cavity and the oil film cavity, respectively. The analog signal is directly converted into a digital signal through electrical connection, providing a decision basis for the control module 11.

[0043] In an optional embodiment, the control structure includes a control module 11, which is electrically connected to a pneumatic pressure sensor 12 and an oil pressure sensor 13, a crankshaft phase sensor 15, and an adjustment structure.

[0044] It should be noted that the control module 11 combines the preset target pressure range, including the target value of the air film chamber pressure and the target value of the pressure difference between the oil film chamber and the air film chamber, dynamically analyzes the direction of the pressure difference and the crankshaft phase information, and generates precise control commands, such as motor speed and solenoid valve opening.

[0045] In an optional embodiment, the adjustment structure includes a driver 10 electrically connected to the control module 11, the driver 10 being connected to a motor 9, the output end of the motor 9 extending into the hydraulic cylinder 5 and fixedly connected to a lead screw 8, the lead screw 8 being connected to a piston 7 via a rotary joint, and the outer wall of the piston 7 being in contact with the inner wall of the lead screw 8.

[0046] It should be noted that the rotary joint connection between the lead screw 8 and the piston 7 enables linear motion conversion: when the motor 9 rotates forward, the lead screw 8 pushes the piston 7 into the hydraulic cylinder 5 to compress the hydraulic oil; when the motor 9 rotates in reverse, the lead screw 8 pulls the piston 7 outward to reduce the volume of hydraulic oil.

[0047] In an optional embodiment, sealing rings 6 are fitted on both the upper and lower sides of the outer wall of the piston 7.

[0048] It should be noted that the sealing ring 6 is made of fluororubber, which has excellent oil resistance and sealing performance and is suitable for high-pressure working conditions.

[0049] In an optional embodiment, a check valve 41 and a check valve 42 are respectively installed on the first oil pipe 31 and the second oil pipe 32. The first check valve 41 is used to ensure that hydraulic oil flows from the inside of the hydraulic cylinder 5 through the first oil pipe 31 to the oil film chamber inside the cylinder body 2, and the second check valve 42 is used to ensure that hydraulic oil flows from the oil inlet 16 through the second oil pipe 32 to the inside of the hydraulic cylinder 5.

[0050] It should be noted that the valve cores of check valve 41 and check valve 42 open and close automatically under hydraulic oil pressure, without the need for external control, which simplifies the system complexity while ensuring the reliability of the oil circuit.

[0051] Example 2

[0052] The adjustment method of the electronically controlled oil pressure regulating system for diaphragm compressors, such as... Figure 2 As shown, it includes the following steps:

[0053] S1: The gear oil pump pumps oil from the oil inlet 16 into the cylinder block 2; the air pressure sensor 12 monitors the air film chamber pressure of the cylinder head 1 in real time, and the oil pressure sensor 13 monitors the oil film chamber pressure of the cylinder block 2 in real time, and transmits the data to the control module 11.

[0054] S2: Crankshaft phase sensor 15 synchronously feeds back the phase angle of the compressor crankshaft, which is used to dynamically adjust the oil pressure control strategy;

[0055] S3: The control module 11 dynamically adjusts the current oil pressure based on the preset target pressure range, such as the target value of the air film chamber pressure and the target difference between the oil film chamber pressure and the air film chamber pressure, combined with real-time data.

[0056] In an optional embodiment, when the oil film chamber pressure of cylinder block 2 is much smaller than the gas film chamber pressure of cylinder head 1 and the pressure difference between the two exceeds a set threshold, such as... Figure 3 As shown, the oil pressure regulation method under this operating condition includes the following steps:

[0057] S11: The control module 11 combines the signal fed back by the crankshaft phase sensor 15 and sends a command to the driver 10.

[0058] S12: After receiving the command, the driver 10 drives the motor 9 to rotate forward. The motor 9 drives the lead screw 8 to rotate, pushing the piston 7 to move into the hydraulic cylinder 5 and compressing the hydraulic oil. When the piston 7 moves, the sealing ring 6 ensures that there is no leakage of hydraulic oil.

[0059] S13: Hydraulic oil enters the hydraulic cylinder 5 through check valve 2 42, and flows to the oil film chamber of cylinder 2 through oil pipe 31 and check valve 41 to increase oil pressure.

[0060] In an optional embodiment, when the oil film chamber pressure of cylinder block 2 is much greater than the gas film chamber pressure of cylinder head 1 and the pressure difference between the two exceeds a set threshold, such as... Figure 4 As shown, the oil pressure regulation method under this operating condition includes the following steps:

[0061] S21: The control module 11 sends an opening command to the solenoid valve 14 to open the drain port 18 of the drain pipe 17, and the hydraulic oil is discharged from the oil film chamber of the cylinder 2 through the drain pipe 17 to reduce the oil pressure.

[0062] S22: The control module 11 can drive the motor 9 to reverse, and pull the piston 7 outward through the lead screw 8 to reduce the volume of hydraulic oil in the hydraulic cylinder 5 and assist in pressure reduction.

[0063] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electronically controlled oil pressure regulating system for a diaphragm compressor, characterized in that, The system includes a cylinder body (2) and a cylinder head (1) mounted on the cylinder body (2). The cylinder head (1) and the cylinder body (2) are provided with a sensing structure, which is connected to the control structure. The inside of the cylinder body (2) is connected to the inside of the hydraulic cylinder (5) through an oil pipe (31). The hydraulic cylinder (5) is fixed with an oil pipe (32) and an oil inlet (16) is provided on the oil pipe (32). The cylinder body (2) is fixed with a drain pipe (17) and an oil drain port (18) is provided on the drain pipe (17). A solenoid valve (14) is installed on the drain pipe (17) and is electrically connected to the control structure. The hydraulic cylinder (5) is provided with an adjustment structure, which is connected to the control structure.

2. The electronically controlled oil pressure regulating system for a diaphragm compressor according to claim 1, characterized in that, The sensing structure includes a pneumatic pressure sensor (12) installed at the pressure tapping port of the cylinder head (1) and an oil pressure sensor (13) installed at the pressure tapping port of the oil film chamber of the cylinder block (2). The pneumatic pressure sensor (12) and the oil pressure sensor (13) are electrically connected to the control structure. The pneumatic pressure sensor (12) is used to acquire the pressure of the air film chamber in real time, and the oil pressure sensor (13) is used to acquire the pressure of the oil film chamber in real time.

3. The electronically controlled oil pressure regulating system for a diaphragm compressor according to claim 2, characterized in that, The control structure includes a control module (11), which is electrically connected to a pressure sensor (12) and an oil pressure sensor (13), is connected to a crankshaft phase sensor (15), and is electrically connected to an adjustment structure.

4. The electronically controlled oil pressure regulating system for a diaphragm compressor according to claim 3, characterized in that, The adjustment structure includes a driver (10) electrically connected to the control module (11), the driver (10) being connected to a motor (9), the output end of the motor (9) extending into the hydraulic cylinder (5) and fixedly connected to a lead screw (8), the lead screw (8) being connected to a piston (7) via a rotary joint, and the outer wall of the piston (7) being in contact with the inner wall of the lead screw (8).

5. The electronically controlled oil pressure regulating system for a diaphragm compressor according to claim 4, characterized in that, The piston (7) has sealing rings (6) fitted on both the upper and lower sides of its outer wall.

6. The electronically controlled oil pressure regulating system for a diaphragm compressor according to claim 1, characterized in that, One-way valve 1 (41) and one-way valve 2 (42) are respectively installed on oil pipe 1 (31) and oil pipe 2 (32). One-way valve 1 (41) is used to ensure that hydraulic oil flows from the inside of the hydraulic cylinder (5) through oil pipe 1 (31) to the oil film chamber inside the cylinder body (2). One-way valve 2 (42) is used to ensure that hydraulic oil flows from the oil inlet (16) through oil pipe 2 (32) to the inside of the hydraulic cylinder (5).

7. A method for regulating an electronically controlled hydraulic pressure regulating system for a diaphragm compressor according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1: The gear oil pump pumps oil from the oil inlet (16) into the cylinder block (2); the air pressure sensor (12) monitors the air film chamber pressure of the cylinder head (1) in real time, and the oil pressure sensor (13) monitors the oil film chamber pressure of the cylinder block (2) in real time and transmits the data to the control module (11); S2: The crankshaft phase sensor (15) synchronously feeds back the phase angle of the compressor crankshaft, which is used to dynamically adjust the oil pressure control strategy; S3: The control module (11) dynamically adjusts the current oil pressure based on the preset target pressure range, such as the target value of the air film chamber pressure and the target difference between the oil film chamber pressure and the air film chamber pressure, combined with real-time data.

8. The adjustment method of the electronically controlled oil pressure regulating system for a diaphragm compressor according to claim 7, characterized in that, When the oil film chamber pressure of the cylinder block (2) is much smaller than the gas film chamber pressure of the cylinder head (1) and the pressure difference between the two exceeds the set threshold, the oil pressure adjustment method under this working condition includes the following steps: S11: The control module (11) combines the signal fed back by the crankshaft phase sensor (15) and sends a command to the driver (10); S12: After receiving the command, the driver (10) drives the motor (9) to rotate forward. The motor (9) drives the lead screw (8) to rotate, pushing the piston (7) to move into the hydraulic cylinder (5) and compressing the hydraulic oil. When the piston (7) moves, the sealing ring (6) ensures that there is no leakage of hydraulic oil. S13: Hydraulic oil enters the hydraulic cylinder (5) through check valve 2 (42) and flows to the oil film chamber of the cylinder body (2) through oil pipe 1 (31) and check valve 1 (41) to increase the oil pressure.

9. The electronically controlled oil pressure regulating system and its regulating method for a diaphragm compressor according to claim 8, characterized in that, When the oil film chamber pressure of the cylinder block (2) is much greater than the gas film chamber pressure of the cylinder head (1) and the pressure difference between the two exceeds the set threshold, the oil pressure adjustment method under this working condition includes the following steps: S21: The control module (11) sends an opening command to the solenoid valve (14) to open the drain port (18) of the drain pipe (17), and the hydraulic oil is discharged from the oil film chamber of the cylinder (2) through the drain pipe (17) to reduce the oil pressure. S22: The control module (11) can drive the motor (9) to reverse, and pull the piston (7) outward through the lead screw (8) to reduce the volume of hydraulic oil in the hydraulic cylinder (5) and assist in pressure reduction.

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