Vacuum pump oil replenishment and replacement system and control method thereof

Abstract

The present invention belongs to the technical field of vacuum pumps, and is particularly directed to a vacuum pump oil replenishment and replacement system and a control method thereof. A balancing oil tank is provided on one side of a vacuum pump or a vacuum pump group, a first air vent is provided on the top of the balancing oil tank, a first oil drain port is provided on the bottom of the balancing oil tank, a first liquid level transmitter is provided on one side of the balancing oil tank, a second air vent is provided on the top of the oil tank of the vacuum pump or the vacuum pump group, the second air vent is connected to a first valve, the first valve is connected to the balancing oil tank via a pipeline, a second oil drain port is provided on the bottom of the oil tank of the vacuum pump or the vacuum pump group, the second oil drain port is connected to a second valve and a third valve respectively, the second valve is connected to a waste oil tank via a pipeline, and the third valve is connected to the first oil drain port via a pipeline. The present invention saves a great deal of labor costs and avoids errors and omissions in human operation, which may result in a lack of lubricating oil in the vacuum pump or deterioration of the lubricating oil, leading to wear of vacuum pump parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum pumps, and in particular to a vacuum pump oil replenishment and replacement system and a control method thereof. Background Art

[0002] Roots vacuum pumps or screw vacuum pumps are typically oil-lubricated, with oil tanks located on the front and rear end covers. Components such as the bearings, transmission gears, and mechanical seals require lubrication and cooling with lubricating oil, which needs to be regularly replaced or replenished. Currently, manual inspection of the oil level and quality is the primary way to determine whether the lubricant needs to be replenished or replaced. This presents the following challenges: 1. Manual recording and determination of oil replenishment or replacement times is required, which is not only cumbersome but also prone to omissions when operating a large number of units. 2. The high installation height of vacuum pumps makes oil changes challenging and dangerous. 3. Oil replenishment or replacement cannot be performed while the equipment is running and can only be performed while the equipment is shut down. If the oil level or quality of a vacuum pump deteriorates, stopping that pump can paralyze the entire vacuum system, severely impacting normal production. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention proposes a vacuum pump oil replenishment and oil change system and its control method, which can automatically calculate the oil replenishment and oil change cycle and automatically replenish or change the oil, saving a lot of manpower costs and avoiding manual operation errors, which may cause the vacuum pump to lack lubricating oil or lubricating oil deterioration, resulting in the problem of wear of vacuum pump parts. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0004] A vacuum pump oil replenishment and replacement system is provided, wherein a balancing oil tank is provided on one side of a vacuum pump or a vacuum pump group, a first air vent is provided on the top of the balancing oil tank, a first oil drain port is provided on the bottom of the balancing oil tank, a first liquid level transmitter is provided on one side of the balancing oil tank, a second air vent is provided on the top of the oil tank of the vacuum pump or the vacuum pump group, the second air vent is connected to a first valve, the first valve is connected to the balancing oil tank through a pipeline, a second oil drain port is provided at the bottom of the oil tank of the vacuum pump or the vacuum pump group, the second oil drain port is connected to a second valve and a third valve respectively, the second valve is connected to a waste oil tank through a pipeline, and the third valve is connected to the first oil drain port through a pipeline.

[0005] Furthermore, the oil storage tank is provided with a discharge port, an oil replenishment port, a third vent and a second liquid level transmitter. The discharge port is connected to the fourth valve, the fourth valve is connected to the oil pump, and the oil pump is connected to the balancing oil tank through a pipeline.

[0006] Furthermore, the normal oil level of the balance oil tank is collinear with the normal oil level of the vacuum pump or the vacuum pump group.

[0007] Specifically, the specifications of each vacuum pump in the vacuum pump group are the same or similar.

[0008] Specifically, when the vacuum pump or the vacuum pump group is operating normally, the first valve, the second valve and the third valve are all in a closed state.

[0009] Preferably, a control system is further included, which is connected to the first valve, the second valve, the third valve, the first liquid level transmitter, the second liquid level transmitter and the oil pump respectively.

[0010] A control method for a vacuum pump oil replenishment and replacement system comprises the following steps:

[0011] Step 1: Pre-set the oil filling and oil change cycles;

[0012] Step 2: The control system automatically calculates the date for oil replenishment and oil change;

[0013] Step 3: When the oil filling or oil change cycle is reached, the control system issues an alarm and determines whether it is in oil filling mode. If so, step 4 is executed; otherwise, step 5 is executed.

[0014] Step 4: When entering the oil replenishment mode, the operator selects the pump position number for oil replenishment, and the control system controls the first and third valves to open, while the second valve remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank automatically flows into the oil tank of the vacuum pump. After the oil replenishment is completed, the control system controls the first and third valves to close, the oil replenishment calculation starting point is reset to zero, and step 2 is repeated;

[0015] Step 5: When entering the oil change mode, the operator determines whether the vacuum pump can be shut down. If so, proceed to step 6; otherwise, proceed to step 8.

[0016] Step 6: The operator selects the pump position number that needs to be changed. The control system controls the first and second valves to open and the third valve to remain closed. At this time, the oil in the vacuum pump tank will automatically drain into the waste oil tank. The draining time is T1 = 75000 × V ÷ (3.14 × d 2 ), unit is S, where V is the oil consumption of the vacuum pump, unit is L, and d is the diameter of the oil drain hole, unit is mm;

[0017] Step 7: After the oil is drained, the control system controls the first and third valves to open, and the second valve remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank automatically flows into the oil tank of the vacuum pump until the oil levels of the two are the same. The oil filling time is the same as T1. After the oil filling is completed, the control system controls the first and third valves to close, the oil change calculation starting point is reset to zero, and step 2 is repeated;

[0018] Step 8: When changing the oil without stopping the machine, the operator selects the pump position number that needs to be changed, and the control system controls the first and second valves to open, and the third valve remains closed. At this time, the oil in the vacuum pump tank will automatically be discharged into the waste oil tank. The oil discharge cycle is T2 = 5000 × V ÷ (3.14 × d 2 ), unit is S;

[0019] Step 9: After the oil discharge cycle is reached, the control system controls the first valve and the third valve to open, and the second valve remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank automatically flows into the oil tank of the vacuum pump. The oil replenishment time is also T2;

[0020] Step 10: After the interval T3, execute step 8, repeat N times and then end. The control system controls the first valve and the third valve to close, the oil change calculation starting point is reset to zero, and repeat step 2.

[0021] Furthermore, the interval T3 is 1-5 minutes, and N is 10-30 times.

[0022] Furthermore, the shutdown condition in step five is that the entire production system can stop working and enter maintenance, or there is another spare vacuum pump to replace the working vacuum pump.

[0023] Specifically, during the oil replenishment or oil change process, when the first liquid level transmitter detects that the oil level in the balancing oil tank is too low, it sends a signal to the control system. The control system controls the oil pump to start and pump the oil from the oil storage tank into the balancing oil tank until the oil level in the balancing oil tank returns to normal. The control system then controls the oil pump to stop.

[0024] The present invention can automatically calculate the oil replenishment and oil change cycles, and automatically replenish or change the oil, saving a lot of manpower costs and avoiding errors and omissions in human operation, which may cause the vacuum pump to lack lubricating oil or the lubricating oil to deteriorate, resulting in wear of vacuum pump parts; and can realize the oil change of the vacuum pump without stopping the vacuum pump, effectively solving the major problem that the vacuum pump oil change may cause the entire production system to stop working. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of embodiment 1 of the present invention;

[0026] Figure 2 This is a structural diagram of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0027] Example 1

[0028] Figure 1 This is a structural diagram of the first embodiment of the present invention, as shown in FIG. Figure 1As shown, a vacuum pump oil replenishment and replacement system is provided, wherein a balancing oil tank 1 is provided on one side of the vacuum pump 2, a first air vent 1.1 is provided on the top of the balancing oil tank 1, a first oil drain port 1.2 is provided on the bottom of the balancing oil tank 1, a first liquid level transmitter 1.3 is provided on one side of the balancing oil tank 1, a second air vent 3.1 is provided on the top of the oil tank 3 of the vacuum pump 2, the second air vent 3.1 is connected to the first valve 4, the first valve 4 is connected to the balancing oil tank 1 through a pipeline, a second oil drain port 3.2 is provided at the bottom of the oil tank 3 of the vacuum pump 2, the second oil drain port 3.2 is connected to the second valve 5 and the third valve 6 respectively, the second valve 5 is connected to the waste oil tank 7 through a pipeline, and the third valve 6 is connected to the first oil drain port 1.2 through a pipeline.

[0029] The purpose of the second air vent 3.1 of the present invention being connected to the balanced oil tank 1 through the first valve 4 is that, since an increase or decrease in oil will cause the space occupied by the gas in the oil tank to change, thereby causing a change in the gas pressure, and the change in gas pressure will make it impossible for oil to be discharged or flowed in, the air vent can maintain the same gas pressure between the oil tanks; and a first air vent 1.1 is also provided in the balanced oil tank 1, and its function is that when the gas pumped by the vacuum pump is not allowed to be discharged into the atmosphere, the first air vent 1.1 needs to be connected to a designated place.

[0030] The oil storage tank 8 is provided with a discharge port 8.1, an oil replenishment port 8.2, a third vent 8.3 and a second liquid level transmitter 8.4. The discharge port 8.1 is connected to a fourth valve 9, which is connected to an oil pump 10. The oil pump 10 is connected to the balancing oil tank 1 through a pipeline.

[0031] The normal oil level of the balance oil tank 1 is collinear with the normal oil level of the vacuum pump 2. When the vacuum pump 2 is operating normally, the first valve 4, the second valve 5 and the third valve 6 are all in a closed state. The system also includes a control system, which is respectively connected to the first valve 4, the second valve 5, the third valve 6, the first liquid level transmitter 1.3, the second liquid level transmitter 8.4 and the oil pump 10.

[0032] A control method for a vacuum pump oil replenishment and replacement system comprises the following steps:

[0033] Step 1: Pre-set the oil filling and oil change cycles.

[0034] Step 2: The control system automatically calculates the date for oil replenishment and oil change.

[0035] Step 3: When the oil replenishment or oil change cycle is reached, the control system issues an alarm and determines whether it is in the oil replenishment mode. If so, execute step 4; otherwise, execute step 5.

[0036] Step 4. When entering the oil replenishment mode, the operator selects the pump position number for oil replenishment. The oil replenishment time for each pump has been set in step 1. When a pump reaches the oil replenishment time, the control system will first issue an alarm. If multiple pumps reach the oil replenishment time at the same time, they can be selected in the order of the pump position numbers. The pump position numbers are pre-set, and multiple pumps can also be selected at the same time; the control system controls the first valve 4 and the third valve 6 to open, and the second valve 5 remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank will automatically flow into the oil tank of the vacuum pump. After the oil replenishment is completed, the control system controls the first valve 4 and the third valve 6 to close, and the oil replenishment calculation starting point is reset to zero, and step 2 is repeated.

[0037] Step 5. When entering the oil change mode, the operator determines whether the vacuum pump can be shut down. If so, execute step 6; otherwise, execute step 8. The shutdown condition is that the entire production system can stop working for maintenance, or there is another spare vacuum pump to replace the working vacuum pump.

[0038] Step 6: The operator selects the pump position number that needs oil change. The control system controls the first valve 4 and the second valve 5 to open, and the third valve 6 remains closed. At this time, the oil in the vacuum pump tank will automatically be discharged into the waste oil tank. The oil discharge time is T1 = 75000 × V ÷ (3.14 × d 2 ), unit is S, where V is the oil consumption of the vacuum pump, unit is L, and d is the diameter of the oil drain hole, unit is mm.

[0039] Step 7. After the oil is drained, the control system controls the first valve 4 and the third valve 6 to open, and the second valve 5 remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank will automatically flow into the oil tank of the vacuum pump until the oil levels of the two are the same. The oil replenishment time is also T1. After the oil replenishment is completed, the control system controls the first valve 4 and the third valve 6 to close, the oil change calculation starting point is reset to zero, and step 2 is repeated.

[0040] Step 8: When changing the oil without stopping the machine, the operator selects the pump position number that needs to be changed, and the control system controls the first valve 4 and the second valve 5 to open, and the third valve 6 to remain closed. At this time, the oil in the vacuum pump tank will automatically be discharged into the waste oil tank. The oil discharge cycle is T2 = 5000 × V ÷ (3.14 × d 2 ), the unit is S; at this time, only about 1 / 10 of the oil in the vacuum pump tank is discharged. The purpose is that the vacuum pump must have enough lubricating oil to lubricate the bearings and gears during operation, and it also plays a role in heat dissipation. If too much oil is discharged and there is not enough lubricating oil, the bearings and gears will wear out in a short time. Therefore, only about 1 / 10 of the oil in the vacuum pump tank is discharged.

[0041] Step 9. After the oil discharge cycle is reached, the control system controls the first valve 4 and the third valve 6 to open, and the second valve 5 remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank will automatically flow into the oil tank of the vacuum pump. The oil replenishment time is also T2.

[0042] Step 10: After the interval T3, execute step 8, repeat N times and then end. The control system controls the first valve 4 and the third valve 6 to close, the oil change calculation starting point is reset to zero, and step 2 is repeated.

[0043] The interval time T3 is 1-5 minutes, and N is 10-30 times; during the oil replenishment or oil change process, when the first liquid level transmitter 1.3 detects that the oil level in the balancing oil tank 1 is too low, it sends a signal to the control system, and the control system controls the oil pump 10 to start and pump the oil in the oil storage tank 8 into the balancing oil tank 1 until the oil level in the balancing oil tank 1 returns to normal, and the control system controls the oil pump 10 to stop.

[0044] Example 2

[0045] Figure 2 This is a structural diagram of the second embodiment of the present invention, as shown in FIG. Figure 2 As shown, Example 2 is a vacuum pump group consisting of three vacuum pumps connected in parallel, namely a first vacuum pump 2-1, a second vacuum pump 2-2, and a third vacuum pump 2-3. Their corresponding oil tanks are the first oil tank 3-1, the second oil tank 3-2, and the third oil tank 3-3, respectively. The specifications of the first vacuum pump 2-1, the second vacuum pump 2-2, and the third vacuum pump 2-3 are the same or similar. "Similar" here means that the outer dimensions of the vacuum pumps are the same or not much different. The other configurations of Example 2 are the same as those of Example 1 and are not further described here.

[0046] The control method of the present invention is described below with a practical example.

[0047] Step 1: Preset the oil replenishment cycle to 2 months and the oil change cycle to 6 months, the pump position number of the first vacuum pump 2-1 to 1, the pump position number of the second vacuum pump 2-2 to 2, and the pump position number of the third vacuum pump 2-3 to 3.

[0048] Step 2: The control system automatically calculates the date for oil replenishment and oil change.

[0049] Step 3: When the oil replenishment cycle reaches 2 months, the first vacuum pump 2-1, the second vacuum pump 2-2, and the third vacuum pump 2-3 all need oil replenishment, and the control system issues an alarm. The control system determines that it is in oil replenishment mode and executes step 4.

[0050] Step 4. When entering the oil replenishment mode, the operator selects pump position number 1, pump position number 2 and pump position number 3 for oil replenishment, and the control system controls the first valve 4 and the third valve 6 corresponding to the first vacuum pump 2-1, the second vacuum pump 2-2 and the third vacuum pump 2-3 to open, and the second valve 5 remains closed. At this time, the first oil tank 3-1, the second oil tank 3-2 and the third oil tank 3-3 are respectively connected to the balancing oil tank 1, and the oil in the balancing oil tank will automatically flow into the first oil tank 3-1, the second oil tank 3-2 and the third oil tank 3-3. After the oil replenishment is completed, the control system controls the first valve 4 and the third valve 6 corresponding to the first vacuum pump 2-1, the second vacuum pump 2-2 and the third vacuum pump 2-3 to close, the oil replenishment calculation starting point is reset to zero, and step 2 is repeated.

[0051] Step 2: The control system automatically calculates the date for oil replenishment and oil change.

[0052] Step 3: When the oil change cycle reaches 6 months, the control system issues an alarm. The control system determines that it is not the oil replenishment mode and executes step 5.

[0053] Step 5: When entering the oil change mode, the operator determines whether the vacuum pump can be shut down. If so, proceed to step 6; otherwise, proceed to step 8. In this embodiment, the oil change does not stop. The first vacuum pump 2-1, the second vacuum pump 2-2, and the third vacuum pump 2-3 all need to change their oils. In this embodiment, step 8 is executed.

[0054] Step 8: When changing the oil without stopping the machine, the operator selects the pump position number 1, pump position number 2 and pump position number 3 that need to be changed, and the control system controls the first valve 4 and the second valve 5 corresponding to the first vacuum pump 2-1, the second vacuum pump 2-2 and the third vacuum pump 2-3 to open, and the third valve 6 remains closed. At this time, the oil in the first oil tank 3-1, the second oil tank 3-2 and the third oil tank 3-3 will automatically be discharged into the waste oil tank 7. The oil discharge cycle is T2==5000×V÷(3.14×d 2 )=5000×3÷(3.14×15 2 )=21S, where V is the oil consumption of the vacuum pump, V==3L, and d is the diameter of the oil drain hole, d=15mm.

[0055] Step 9. After the oil discharge cycle is reached, the control system controls the first valve 4 and the third valve 6 corresponding to the first vacuum pump 2-1, the second vacuum pump 2-2, and the third vacuum pump 2-3 to open, and the second valve 5 remains closed. At this time, the first oil tank 3-1, the second oil tank 3-2, and the third oil tank 3-3 are connected to the balancing oil tank 1, and the oil in the balancing oil tank 1 will automatically flow into the first oil tank 3-1, the second oil tank 3-2, and the third oil tank 3-3. The oil replenishment time is the same as T2==21S.

[0056] Step 10: After the interval T3 = 1 minute, execute step 8 and repeat 20 times before ending. The control system controls the first valve 4 and the third valve 6 corresponding to the first vacuum pump 2-1, the second vacuum pump 2-2, and the third vacuum pump 2-3 to close respectively. The oil change calculation starting point is reset to zero and step 2 is repeated.

[0057] In short, the present invention can automatically calculate the oil replenishment and oil change cycles, and automatically replenish or change the oil, saving a lot of manpower costs and avoiding errors and omissions in human operation, which may cause the vacuum pump to lack lubricating oil or the lubricating oil to deteriorate, resulting in wear of vacuum pump parts; when maintaining the equipment, there is no need to climb to a high place to check the equipment and change the lubricating oil, which greatly improves the safety of equipment maintenance; and the vacuum pump can be changed without stopping the oil, which effectively solves the major problem that changing the vacuum pump oil may cause the entire production system to stop working.

Claims

1. A vacuum pump oil replenishment and replacement system, characterized in that: A balancing oil tank is provided on one side of the vacuum pump or vacuum pump group, a first air vent is provided on the top of the balancing oil tank, a first oil drain port is provided on the bottom of the balancing oil tank, a first liquid level transmitter is provided on one side of the balancing oil tank, a second air vent is provided on the top of the oil tank of the vacuum pump or vacuum pump group, the second air vent is connected to a first valve, the first valve is connected to the balancing oil tank through a pipeline, a second oil drain port is provided on the bottom of the oil tank of the vacuum pump or vacuum pump group, the second oil drain port is connected to a second valve and a third valve respectively, The second valve is connected to the waste oil tank through a pipeline, and the third valve is connected to the first oil drain port through a pipeline; the oil storage tank is also included, and the oil storage tank is provided with a drain port, an oil replenishment port, a third vent and a second liquid level transmitter. The drain port is connected to the fourth valve, and the fourth valve is connected to the oil pump. The oil pump is connected to the balancing oil tank through a pipeline. The normal oil level of the balancing oil tank is collinear with the normal oil level of the vacuum pump or the vacuum pump group. When the vacuum pump or the vacuum pump group is operating normally, the first valve, the second valve and the third valve are all in a closed state.

2. The vacuum pump oil replenishment and replacement system according to claim 1, characterized in that: The specifications of each vacuum pump in the vacuum pump group are the same or similar.

3. The vacuum pump oil replenishment and replacement system according to claim 1 or 2, characterized in that: It also includes a control system, which is connected to the first valve, the second valve, the third valve, the first liquid level transmitter, the second liquid level transmitter and the oil pump respectively.

4. A control method for a vacuum pump oil replenishment and replacement system according to claim 3, characterized in that: The following steps are involved: Step 1: Pre-set the oil filling and oil change cycles; Step 2: The control system automatically calculates the date for oil replenishment and oil change; Step 3: When the oil filling or oil change cycle is reached, the control system issues an alarm and determines whether it is in oil filling mode. If so, step 4 is executed; otherwise, step 5 is executed. Step 4: When entering the oil replenishment mode, the operator selects the pump position number for oil replenishment, and the control system controls the first and third valves to open, while the second valve remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank automatically flows into the oil tank of the vacuum pump. After the oil replenishment is completed, the control system controls the first and third valves to close, the oil replenishment calculation starting point is reset to zero, and step 2 is repeated; Step 5: When entering the oil change mode, the operator determines whether the vacuum pump can be shut down. If so, proceed to step 6; otherwise, proceed to step 8. Step 6. The operator selects the pump position number that needs to be changed. The control system controls the first and second valves to open and the third valve to remain closed. At this time, the oil in the vacuum pump tank will automatically drain into the waste oil tank. The draining time is T1=75000×V÷(3.14×d 2 ), unit is S, where V is the oil consumption of the vacuum pump, unit is L, and d is the diameter of the oil drain hole, unit is mm; Step 7: After the oil is drained, the control system controls the first and third valves to open, and the second valve remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank automatically flows into the oil tank of the vacuum pump until the oil levels of the two are the same. The oil filling time is the same as T1. After the oil filling is completed, the control system controls the first and third valves to close, the oil change calculation starting point is reset to zero, and step 2 is repeated; Step 8: When changing the oil without stopping the machine, the operator selects the pump position number that needs to be changed, and the control system controls the first and second valves to open, and the third valve remains closed. At this time, the oil in the vacuum pump tank will automatically be discharged into the waste oil tank. The oil discharge cycle is T2=5000×V÷(3.14×d 2 ), unit is S; Step 9: After the oil discharge cycle is reached, the control system controls the first valve and the third valve to open, and the second valve remains closed. At this time, the oil tank of the vacuum pump is connected to the balancing oil tank, and the oil in the balancing oil tank automatically flows into the oil tank of the vacuum pump. The oil replenishment time is also T2; Step 10: After the interval T3, execute step 8, repeat N times and then end. The control system controls the first valve and the third valve to close, the oil change calculation starting point is reset to zero, and repeat step 2.

5. The control method of the vacuum pump oil replenishment and replacement system according to claim 4, characterized in that: The interval time T3 is 1-5 minutes, and N is 10-30 times.

6. The control method of the vacuum pump oil replenishment and replacement system according to claim 4, characterized in that: The shutdown condition in step 5 is that the entire production system can stop working and enter maintenance, or there is another spare vacuum pump to replace the working vacuum pump.

7. The control method of the vacuum pump oil replenishment and replacement system according to claim 4, characterized in that: During the oil replenishment or oil change process, when the first liquid level transmitter detects that the oil level in the balancing oil tank is too low, it sends a signal to the control system. The control system controls the oil pump to start and pump the oil from the oil storage tank into the balancing oil tank until the oil level in the balancing oil tank returns to normal. The control system controls the oil pump to stop.

Images