Vacuum pump safety control system and control method

Abstract

The invention belongs to the technical field of vacuum pumps, and particularly relates to a vacuum pump safety control system and method. The system comprises a vacuum pump cooling module for cooling a vacuum pump; the vacuum pump operation monitoring module detects operation data of the vacuum pump; the vacuum pump work monitoring module detects work data of the vacuum pump; the vacuum pump environment detection module detects environment data of the environment where the vacuum pump is located; the vacuum pump safety protection module changes the running state of the vacuum pump in time when the vacuum pump runs abnormally; and the vacuum pump control module is used for receiving data detected by the vacuum pump operation monitoring module, the vacuum pump work monitoring module and the vacuum pump environment detection module, judging the operation condition of the vacuum pump after processing the data, and controlling the work of the vacuum pump cooling module and the vacuum pump safety protection module according to the operation condition of the vacuum pump.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pumps, and in particular relates to a vacuum pump safety control system and a control method. Background Art

[0002] Vacuum pumps are widely used in many industries such as chemical, pharmaceutical, food, and electronics. The vacuum pump uses the screw to rotate synchronously in opposite directions in the inner cavity to produce suction and exhaust, thereby providing a stable power source for the vacuum environment. However, as the vacuum pump is used for a longer time, the temperature of the motor and pump body increases, which may have a certain impact on the working effect of the vacuum pump; at the same time, the vacuum pump may also have certain faults during operation. If the vacuum pump is not stopped in time when a fault occurs, it is easy to cause equipment damage. Summary of the invention

[0003] The purpose of the present invention is to provide a control system and a control method for ensuring stable and safe operation of a vacuum pump in view of the above-mentioned technical problems.

[0004] In view of this, the present invention provides a vacuum pump safety control system, comprising: A vacuum pump cooling module is used to cool the vacuum pump; Vacuum pump operation monitoring module, to detect the operation data of the vacuum pump; Vacuum pump operation monitoring module, detecting the working data of the vacuum pump; A vacuum pump environment detection module detects the environmental data of the environment in which the vacuum pump is located; The vacuum pump safety protection module changes the operating state of the vacuum pump in time when the vacuum pump operates abnormally; The vacuum pump control module receives the data detected by the vacuum pump operation monitoring module, the vacuum pump work monitoring module and the vacuum pump environment detection module, and determines the operation status of the vacuum pump after processing the data, and controls the operation of the vacuum pump cooling module and the vacuum pump safety protection module according to the vacuum operation status.

[0005] In the above technical solution, further, the vacuum pump cooling module includes: A pump body delivery pipeline, which is provided with a pump body delivery valve, is used to deliver cooling medium to cool the vacuum pump body; A motor delivery pipeline, which is provided with a motor delivery valve, for delivering cooling medium to cool the vacuum pump motor; A cooling return pipeline is used to receive the cooling medium that is heated after cooling the vacuum pump body and the vacuum pump motor; A cooling shunt circuit is used to cool the heated cooling medium transported by the cooling return pipeline; The cooling boost pipeline is used to transport cooling medium to the pump body delivery pipeline and / or the motor delivery pipeline.

[0006] In the above technical solution, further, the cooling shunt circuit includes: A first cooler, the inlet end of which is connected to the cooling return pipeline; A cooling branch pipeline, one end of which is connected to the outlet of the first cooler, and the other end of which is connected in parallel to two cooling branch pipes, and each cooling branch pipe is provided with a cooling control valve; A first cooling chamber, the inlet end of which is connected to the outlet end of one of the cooling branch pipes; A second cooler, the inlet end of which is connected to the outlet end of another cooling branch pipe; The inlet of the second cooling chamber is connected with the outlet of the second cooler through a pipeline.

[0007] In the above technical solution, further, the cooling and boosting pipeline includes: A first medium delivery pipeline, which delivers the cooling medium in the first cooling chamber to the pump body delivery pipeline and / or the motor delivery pipeline; A second medium delivery pipeline, which delivers the cooling medium in the second cooling chamber to the pump body delivery pipeline and / or the motor delivery pipeline; The first medium delivery pipeline and the second medium delivery pipeline both include: A booster pump, the inlet of which is connected to the outlet of the first cooling chamber or the second cooling chamber; A boosting circuit having a boosting control valve and a boosting pump; A pressure-maintaining circuit having a pressure-maintaining control valve; Two flow-dividing branches are provided with flow-dividing control valves, one outlet of which is connected to the pump delivery pipeline, and the other outlet of which is connected to the motor delivery pipeline; The inlet ends of the boosting circuit and the pressure maintaining circuit are respectively connected to the outlet ends of the boosting pump, and the outlet ends of the boosting circuit and the pressure maintaining circuit are combined and connected to a shunt pipe, and the other end of the shunt pipe is respectively connected to two shunt branches.

[0008] In the above technical solution, further, the vacuum pump operation monitoring module includes: Pump body temperature monitor, used to detect the real-time temperature of the vacuum pump body; Motor temperature monitor, used to detect the real-time temperature of the vacuum pump motor; Voltage monitor, used to detect the real-time voltage of the vacuum pump motor; A current monitor is used to detect the real-time current of the vacuum pump motor; The speed monitor is used to detect the real-time speed of the screw when the vacuum pump is running.

[0009] In the above technical solution, it is further characterized in that: The vacuum pump operation monitoring module includes: Intake monitor, used to detect the real-time flow rate at the intake end of the vacuum pump; Exhaust monitor, used to detect the real-time flow rate at the exhaust end of the vacuum pump; Gas detector, used to detect the composition of the gas entering the vacuum pump; Vacuum gauge, used to monitor the vacuum degree of the vacuum pump group's vacuum environment; The vacuum pump environment detection module includes: External temperature monitor, used to detect the temperature of the environment where the vacuum pump is located; A flow detector is used to detect the air flow in the environment where the vacuum pump is located; The vacuum pump safety protection module includes: The front protector is used to forcibly interrupt the operation of the vacuum pump when an abnormality occurs in the vacuum pump; The alarm is used to sound an alarm when an abnormality occurs in the vacuum pump.

[0010] A control method for a vacuum pump safety control system, Step 1: establishing a threshold value. A threshold model of the vacuum pump is established according to the vacuum pump operating under different output power conditions, including a pump body temperature threshold, a motor temperature threshold, a voltage threshold, a current threshold, an intake threshold, an exhaust threshold, and a speed threshold. Step 2: external data acquisition, obtaining the ambient temperature and air flow rate of the environment where the vacuum pump is located; Step 3: Acquire operation data to obtain real-time data of the vacuum pump operation, including the temperature of the vacuum pump body, the motor temperature, the motor voltage, the motor current, the vacuum pump intake flow, the vacuum pump exhaust flow, the screw speed, the gas composition entering the vacuum pump, and the vacuum degree of the vacuum environment; Step 4: threshold calibration: calibrate the threshold according to external data, gas composition entering the vacuum pump and vacuum degree of the vacuum environment, including pump body temperature threshold calibration, motor temperature threshold calibration, air pump intake flow calibration and vacuum pump exhaust flow calibration; Step 5: data comparison: comparing the obtained operation data of the vacuum pump with the corresponding threshold model to determine whether the operation of the vacuum pump is abnormal; Step 6, vacuum pump operation control, controlling the output status of the vacuum pump cooling module according to the operation status of the vacuum pump, and stopping the operation of the vacuum pump when the vacuum pump operates abnormally; Step 7: If there is no abnormality in the vacuum pump, repeat steps 2 to 6 or steps 3 to 6.

[0011] In the above technical solution, further, in step 5, determining that the vacuum pump is operating abnormally includes: Vacuuming abnormality: if the vacuum pump intake flow rate is not within the intake threshold and / or the vacuum pump exhaust flow rate is not within the exhaust threshold, it is judged as vacuuming abnormality; The vacuum pump is operating abnormally. If the pump body temperature exceeds the pump body temperature threshold and / or the screw speed is not within the speed threshold, it is judged that the vacuum pump is operating abnormally; The motor is running abnormally, and the motor temperature exceeds the motor temperature threshold and / or the voltage is not within the voltage threshold and / or the current is not within the current threshold.

[0012] In the above technical solution, further, in step six, when the vacuum pump operates abnormally and continues for a period of time, the vacuum pump control module will forcibly interrupt the operation of the vacuum pump and sound an alarm through the alarm.

[0013] The beneficial effects of the present invention are: 1. The vacuum pump safety control system can cool the vacuum pump in a timely and efficient manner, thereby ensuring the operating efficiency of the vacuum pump. At the same time, it can respond promptly when the vacuum pump operates abnormally, reducing the probability of damage to the vacuum pump; 2. The vacuum pump safety control method can ensure the safety monitoring of the vacuum pump, and cut off the operation of the vacuum pump in time when the vacuum pump is abnormal. At the same time, according to the different temperatures of the pump body and motor of the vacuum pump, the output of the booster pump and the pressure pump at different powers can be controlled, thereby reducing the power consumption while ensuring the cooling of the pump body and the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a vacuum pump cooling module in the system of the present invention; Figure 2 It is a control principle diagram in the method of the present invention; Markings in the figure are as follows: 1-pump body delivery pipeline, 2-pump body delivery valve, 3-motor delivery pipeline, 4-motor delivery valve, 5-cooling reflux pipeline, 6-first cooler, 7-cooling branch pipeline, 8-cooling branch pipe, 9-cooling control valve, 10-first cooling chamber, 11-second cooler, 12-second cooling chamber, 13-first medium delivery pipeline, 14-second medium delivery pipeline, 100-boosting pump, 101-boosting circuit, 102-pressure control valve, 103-pressure pump, 104-pressure maintaining circuit, 105-pressure maintaining control valve, 106-diverter pipe, 107-diverter branch, 108-diverter control valve, 111-vacuum pump body, 112-vacuum pump motor. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0016] Embodiment 1: This embodiment provides a vacuum pump safety control system, including: A vacuum pump cooling module is used to cool the vacuum pump; Vacuum pump operation monitoring module, to detect the operation data of the vacuum pump; Vacuum pump operation monitoring module, detecting the working data of the vacuum pump; A vacuum pump environment detection module detects the environmental data of the environment in which the vacuum pump is located; The vacuum pump safety protection module changes the operating state of the vacuum pump in time when the vacuum pump operates abnormally; The vacuum pump control module receives the data detected by the vacuum pump operation monitoring module, the vacuum pump work monitoring module and the vacuum pump environment detection module, and determines the operation status of the vacuum pump after processing the data, and controls the operation of the vacuum pump cooling module and the vacuum pump safety protection module according to the vacuum operation status.

[0017] In this embodiment, the vacuum pump control module includes a control circuit and a controller with electronic components such as relays and contactors, and the vacuum pump is safely controlled by the vacuum pump control module. The vacuum pump body 111 and the vacuum pump motor 112 of the vacuum pump group to which the safety control system is applied are both provided with a cooling chamber; the vacuum pump cooling module timely cools the pump body and the motor according to the heating conditions of the pump body and the motor, thereby ensuring the stability of the overall operation of the vacuum pump and the working effect of the vacuum pump. The vacuum pump operation detection module monitors the data of the operation of the vacuum pump group, including the pump body temperature, the motor temperature, the input current, the voltage and the screw speed of the motor; so that the vacuum pump cooling module can make timely adjustments to the cooling mode and detect whether the vacuum pump group is abnormal. The vacuum pump operation monitoring module is used to monitor the data of the vacuum pump group during operation, including the intake and exhaust volume of the vacuum pump, so as to better monitor the working effect and working condition of the vacuum pump group according to the intake and exhaust volume. The vacuum pump safety protection module terminates the operation of the vacuum pump group in time when the vacuum pump group is abnormal, so as to avoid damage to the equipment or increase the loss.

[0018] Embodiment 2: This embodiment provides a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0019] The vacuum pump cooling module includes: A pump body delivery pipeline 1, on which a pump body delivery valve 2 is provided, is used to deliver a cooling medium to cool the vacuum pump body 111; The motor delivery pipeline 3 is provided with a motor delivery valve 4 for delivering cooling medium to cool the vacuum pump motor 112; The cooling return line 5 is used to receive the cooling medium that is heated after cooling the vacuum pump body 111 and the vacuum pump motor 112; A cooling shunt circuit, used to cool the heated cooling medium transported by the cooling return line 5; The cooling and boosting pipeline is used to transport cooling medium to the pump body delivery pipeline 1 and / or the motor delivery pipeline 3.

[0020] In this embodiment, the pump body delivery pipeline 1 is used to deliver coolant to the cooling chamber on the vacuum pump body 111, cool down the pump body in time, and ensure the temperature inside the pump body; the motor delivery pipeline 3 is used to deliver coolant to the motor, cool down the motor in time; through the cooperation of the pump body delivery pipeline 1 and the motor delivery pipeline 3, the temperature of the pump body and the motor can be well guaranteed, and the influence of temperature rise on the working effect of the vacuum pump group can be reduced. The cooling return pipeline 5 is used to receive the heated cooling medium discharged from the pump body and the motor, and the cooling shunt circuit cools the heated cooling medium, so as to better prepare for the cooling of the vacuum pump; the cooling boost pipeline can ensure the stability of the cooling medium delivery to ensure the cooling effect of the motor and the pump body. The motor delivery valve 4 and the pump body delivery valve 2 are both solenoid valves, which are controlled by the controller.

[0021] Embodiment 3: This embodiment provides a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0022] The cooling split circuit includes: A first cooler 6, the inlet end of which is connected to the cooling return pipeline 5; A cooling branch pipeline 7, one end of which is connected to the outlet of the first cooler 6, and the other end of which is connected in parallel to two cooling branch pipes 8, and each cooling branch pipe 8 is provided with a cooling control valve 9; The first cooling chamber 10 has an inlet end connected to an outlet end of one of the cooling branches 8; The inlet end of the second cooler 11 is connected to the outlet end of another cooling branch pipe 8; The inlet end of the second cooling chamber 12 is connected to the outlet end of the second cooler 11 through a pipeline.

[0023] In this embodiment, the cooling control valve 9 is an electromagnetic flow control valve, which is controlled by the controller programming. The first cooler 6 is used to preliminarily cool the heated cooling medium, and the second cooler 11 further cools the cooling medium cooled by the first cooler 6. The first cooling chamber 10 is used to store the first cooling medium cooled by the first cooler 6, and the second cooling chamber 12 is used to store the second cooling medium cooled by the first cooler 6 and the second cooler 11, and the temperature of the first cooling medium is greater than the temperature of the second cooling medium. The setting of the cooling branch pipeline 7 is used to reasonably distribute the first cooling medium obtained after cooling by the first cooler 6, a part of which is stored in the first cooling chamber 10, and the other part is cooled by the second cooler 11. At the same time, liquid level sensors are provided in the first cooling chamber 10 and the second cooling chamber 12. Through the feedback of the liquid level sensor, the vacuum pump control module controls the opening and closing degree of the cooling control valve 9 on the two cooling branches 8, thereby ensuring that the liquid level of the cooling medium in the first cooling chamber 10 and the second cooling chamber 12 is nearly equal. And the first cooler 6 and the second cooler 11 are both controlled and operated by the controller.

[0024] Embodiment 4: This embodiment provides a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0025] The cooling boost line includes: A first medium delivery pipeline 13 delivers the cooling medium in the first cooling chamber 10 to the pump delivery pipeline 1 and / or the motor delivery pipeline 3; The second medium delivery pipeline 14 delivers the cooling medium of the second cooling chamber 12 to the pump body delivery pipeline 1 and / or the motor delivery pipeline 3; The first medium delivery pipeline 13 and the second medium delivery pipeline 14 both include: A booster pump 100, the inlet end of which is connected to the outlet of the first cooling chamber 10 or the second cooling chamber 12; A boosting circuit 101 having a boosting control valve 102 and a boosting pump 103; A pressure-maintaining circuit 104 having a pressure-maintaining control valve 105; Two flow shunt branches 107, each with a flow shunt control valve 108, one outlet of which is connected to the pump body delivery pipeline 1, and the other outlet of which is connected to the motor delivery pipeline 3; The inlet ends of the boosting circuit 101 and the pressure maintaining circuit 104 are respectively connected to the outlet ends of the boosting pump 100 , and the outlet ends of the boosting circuit 101 and the pressure maintaining circuit 104 are combined and connected to a shunt pipe 106 , and the other end of the shunt pipe 106 is respectively connected to two shunt branches 107 .

[0026] In this embodiment, the first medium delivery pipeline 13 is used to deliver the first cooling medium to the pump body delivery pipeline 1 and / or the motor delivery pipeline 3, so as to cool the pump body and / or the motor through the first cooling medium; the second medium delivery pipeline 14 is used to deliver the second cooling medium to the pump body delivery pipeline 1 and / or the motor delivery pipeline 3, so as to cool the pump body and / or the motor through the second cooling medium. The first medium delivery pipeline 13 and the second medium delivery pipeline 14 both include a booster pump 100 and a pressure pump 103, and the first cooling medium or the second cooling medium is pressurized by the booster pump 100 and then delivered to the pump body delivery pipeline 1 and / or the motor delivery pipeline 3; the first cooling medium or the second cooling medium is pressurized twice by the pressure pump 103 and then delivered to the pump body delivery pipeline 1 and the motor delivery pipeline 3, thereby ensuring the stability, flow rate and pressure of the first cooling medium and the second cooling medium input into the pump body delivery pipeline 1 and / or the motor delivery pipeline 3 to ensure the cooling effect. The pressure-maintaining circuit 104 is used to control whether the first cooling medium or the second cooling medium is pressurized for the second time by the pressure pump 103. The branching branch 107 is provided to ensure that the first cooling medium and the second cooling medium can better enter the pump body delivery pipeline 1 and / or the motor delivery pipeline 3. The booster pump 100, the pressure control valve 102, the pressure pump 103 and the pressure-maintaining control valve in the first medium delivery pipeline 13 and the second medium delivery pipeline 14 are all controlled by the controller.

[0027] Embodiment 5: This embodiment provides a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0028] The vacuum pump operation monitoring module includes: A pump body temperature monitor, used to detect the real-time temperature of the vacuum pump body 111; A motor temperature monitor, used to detect the real-time temperature of the vacuum pump motor 112; A voltage monitor, used to detect the real-time voltage of the vacuum pump motor 112; A current monitor, used to detect the real-time current of the vacuum pump motor 112; The speed monitor is used to detect the real-time speed of the screw when the vacuum pump is running.

[0029] In this embodiment, the pump body temperature monitor, motor temperature monitor, voltage monitor, current monitor and speed monitor all feed back the detected data to the controller. By acquiring the pump body temperature, motor temperature, motor current, motor voltage and screw speed in real time, the operation of the vacuum pump group can be better detected, so that a timely response can be made when the vacuum pump operates abnormally to reduce the probability of equipment damage.

[0030] Embodiment 6: This embodiment provides a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0031] The vacuum pump operation monitoring module includes: Intake monitor, used to detect the real-time flow rate at the intake end of the vacuum pump; Exhaust monitor, used to detect the real-time flow rate at the exhaust end of the vacuum pump; Gas detector, used to detect the composition of the gas entering the vacuum pump; Vacuum gauge, used to monitor the vacuum degree of the vacuum pump group's vacuum environment; The vacuum pump environment detection module includes: External temperature monitor, used to detect the temperature of the environment where the vacuum pump is located; A flow detector is used to detect the air flow in the environment where the vacuum pump is located; The vacuum pump safety protection module includes: The front protector is used to forcibly interrupt the operation of the vacuum pump when an abnormality occurs in the vacuum pump; The alarm is used to sound an alarm when an abnormality occurs in the vacuum pump.

[0032] In this embodiment, by monitoring the flow data of intake and exhaust and comparing them, it is possible to determine whether the air inlet of the vacuum pump group is blocked or whether the pump body is damaged. The gas detector and the vacuum gauge are used to detect the composition of the extracted gas and the vacuum degree of the vacuum environment, so as to timely correct the relationship between the intake and exhaust gas and the intake and exhaust flow data between the intake detector and the outlet detector. The external temperature detector and the circulation detector are used to detect the temperature and air circulation of the environment in which the vacuum pump group is located, so as to reasonably correct the heating temperature values ​​of the motor and the pump body to ensure accurate monitoring. The pre-protector will interrupt the operation of the vacuum pump in time when the vacuum pump group is abnormal to reduce the probability of equipment damage. The alarm can transmit the fault message in time, so as to facilitate the staff to check or maintain the vacuum pump group that may have abnormalities, so that the abnormalities can be eliminated as soon as possible and resume work.

[0033] Embodiment 7: This embodiment provides a control method for a vacuum pump safety control system, including: Step 1: establishing a threshold value. A threshold model of the vacuum pump is established according to the vacuum pump operating under different output power conditions, including a pump body temperature threshold, a motor temperature threshold, a voltage threshold, a current threshold, an intake threshold, an exhaust threshold, and a speed threshold. Step 2: external data acquisition, obtaining the ambient temperature and air flow rate of the environment where the vacuum pump is located; Step 3: Acquiring operation data, acquiring real-time data of the operation of the vacuum pump, including the temperature of the vacuum pump body 111, the motor temperature, the motor voltage, the motor current, the vacuum pump intake flow rate, the vacuum pump exhaust flow rate, the screw speed, the gas composition entering the vacuum pump, and the vacuum degree of the vacuum environment; Step 4: threshold calibration, calibrating the threshold according to external data, gas composition entering the vacuum pump and vacuum degree of the vacuum environment, including pump body temperature threshold calibration, motor temperature threshold calibration, air pump intake flow calibration and vacuum pump exhaust flow calibration; Step 5: data comparison: comparing the obtained operation data of the vacuum pump with the corresponding threshold model to determine whether the operation of the vacuum pump is abnormal; Step 6, vacuum pump operation control, controlling the output status of the vacuum pump cooling module according to the operation status of the vacuum pump, and stopping the operation of the vacuum pump when the vacuum pump operates abnormally; Step 7: If there is no abnormality in the vacuum pump, repeat steps 2 to 6 or steps 3 to 6.

[0034] In this embodiment, the threshold in step one is established before the device is used or when it is used for the first time; the temperature and air flow conditions of the environment in which the vacuum pump group is located are obtained through step two, and the real-time data of the vacuum pump is obtained in step three; because factors such as external temperature, air flow rate, vacuum gas composition and vacuum degree will affect the pump body temperature, motor temperature or intake and exhaust flow, in step four, the pump body temperature threshold correction, motor temperature threshold correction, air pump intake flow correction and vacuum pump exhaust flow are floatingly corrected within a certain range according to external data to ensure the accuracy of the threshold setting; the corrected data threshold is then compared with the operating data of the vacuum pump to judge the operating condition of the vacuum pump group, so as to better control the vacuum pump cooling module and promptly interrupt the operation of the vacuum pump group when abnormal operation of the vacuum pump group occurs. Since most of the vacuum pump groups are set up in workshops or pump rooms, the external temperature and air flow rate of the vacuum pump group are relatively stable and will not fluctuate greatly. Therefore, the frequency of external data acquisition in step 2 is 15-30 minutes / time; therefore, if there is no abnormality in the vacuum pump in step 7, the frequency of repeating steps 2 to 6 is 15-30 minutes / time; and at other times, repeating steps 3 to 6 is 5-30 seconds / time. In steps 2 to 5, the vacuum pump group is in operation, and the vacuum pump cooling module assembly is also in operation.

[0035] Embodiment 8: This embodiment provides a control method for a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0036] In step 5, the vacuum pump is judged to be operating abnormally including: Vacuuming abnormality: if the vacuum pump intake flow rate is not within the intake threshold and / or the vacuum pump exhaust flow rate is not within the exhaust threshold, it is judged as vacuuming abnormality; The vacuum pump is operating abnormally. If the pump body temperature exceeds the pump body temperature threshold and / or the screw speed is not within the speed threshold, it is judged that the vacuum pump is operating abnormally; The motor is running abnormally, and the motor temperature exceeds the motor temperature threshold and / or the voltage is not within the voltage threshold and / or the current is not within the current threshold.

[0037] In this embodiment, the vacuum abnormality may include the blockage of the air intake filter or the rupture of the pump body. If other operating data are within the threshold, and only the air intake and exhaust volumes are less than the threshold, it can be preliminarily determined that the filter is clogged; if other operating data are within the threshold, and only the exhaust volume is less than the threshold, it can be preliminarily determined that the pump body is ruptured, resulting in a decrease in exhaust volume.

[0038] Abnormal operation of the vacuum pump includes the presence of foreign matter in the pump body; if other operating values ​​are within the threshold, but the motor temperature is greater than the threshold and / or the pump body temperature is greater than the threshold and / or the motor current is greater than the threshold and / or the motor voltage is not within the threshold and the screw speed is less than the threshold, it can be preliminarily determined that the presence of foreign matter in the pump body causes the screw speed to decrease, and at the same time causes excessive friction in the pump body, resulting in excessive pump body temperature or motor overload, causing the motor to overheat or causing changes in the motor current and voltage.

[0039] Abnormal motor operation may include internal motor faults; when other operating data are within the threshold, but the motor temperature is greater than the threshold and / or the motor current is greater than the threshold and / or the motor voltage is greater than the threshold, it can be preliminarily determined as an internal motor fault. If other operating data are within the threshold, but the motor current is less than the threshold and / or the motor voltage is less than the threshold, it can also be preliminarily determined as an internal motor fault.

[0040] Embodiment 9: This embodiment provides a control method for a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0041] In step six, when the vacuum pump operates abnormally and continues for a period of time, the vacuum pump control module will forcibly interrupt the operation of the vacuum pump and sound an alarm through the alarm.

[0042] In this embodiment, when the vacuum pumping abnormality lasts for more than 2-10 min, the vacuum pump control module alarms through the alarm; when the vacuum pump operation abnormality lasts for more than 30-60s, the vacuum pump control module controls the alarm to alarm, and at the same time controls the pre-protector to forcibly interrupt the operation of the vacuum pump group; when the motor operation abnormality lasts for more than 15-30s, the vacuum pump control module controls the alarm to alarm, and at the same time controls the pre-protector to forcibly interrupt the operation of the vacuum pump group.

[0043] Embodiment 10: This embodiment provides a control method for a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0044] In step 6, the vacuum pump control module divides the temperature threshold of the pump body from low to high according to the different working modes of the vacuum pump, which are T C1 、T C2 and T C3 ; The motor temperature threshold is divided from low to high, respectively T M1 、T M2 and T M3 ; When the pump body temperature is lower than T C1 The cooling medium transported by the pump body is cooled; When the pump body temperature is T C1 When the controller cools the pump body, the cooling medium in the first cooling chamber 10 is used as a cooling source; When the pump body temperature is T C2 When the pump is in the cooling chamber, the controller mixes the cooling media in the first cooling chamber 10 and the second cooling chamber 12 as a cooling source to cool the pump body; When the pump body temperature is T C3 When the pump is in the cooling chamber, the controller uses the cooling medium in the second cooling chamber 12 as a cooling source to cool the pump body; When the motor temperature is less than T M1 Then no cooling medium is delivered to the motor for cooling; When the motor temperature is T M1 When the motor is in the cooling chamber, the controller uses the cooling medium in the cooling chamber as a cooling source to cool the motor; When the motor temperature is T M2 When the motor is in the first cooling chamber 10, the controller mixes the cooling media in the second cooling chamber 12 as a cooling source to cool the motor; When the motor temperature is T M3 When the motor is in the second cooling chamber 12, the controller uses the cooling medium in the second cooling chamber 12 as a cooling source to cool the motor; If the pump body temperature is T C1 and the motor temperature is T M1 When the pressure is high, the booster pump 100 and the pressure pump 103 of the first medium delivery pipeline 13 are started simultaneously; If the pump body temperature is T C1 , motor temperature at T M2 When the pump body temperature is T C2 Internal, motor temperature is internal T M1When the booster pump 100 of the first cooling medium delivery pipeline and the booster pump 100 of the second medium delivery pipeline 14 are started simultaneously; If the pump body temperature is T C2 and the motor temperature is T M2 When the pressure is high, the booster pump 100 and the pressure pump 103 of the first medium delivery pipeline 13 and the booster pump 100 of the second medium delivery pipeline 14 are started simultaneously; If the pump body temperature is T C2 Internal and motor temperature at T M3 When the pump body temperature is T C3 Internal and motor temperature at T M2 At this time, the booster pump 100 of the first medium delivery pipeline 13 and the booster pump 100 and the pressure pump 103 of the second medium delivery pipeline 14 are started simultaneously; If the pump body temperature is T C3 and the motor temperature is T M3 The booster pump 100 and the pressure pump 103 of the second medium delivery pipeline 14 are started simultaneously; If the pump body temperature is less than T C1 Or the motor temperature is less than T M1 When the booster pump 100 of the first medium delivery pipeline 13 is started; If the pump body temperature is less than T C1 and the motor temperature is less than T M1 When the pumps on the first medium delivery pipeline 13 and the second medium delivery pipeline 14 are not started.

[0045] In this embodiment, since the temperature of the pump body and the temperature of the motor of the vacuum pump may be different under different working conditions, the temperature threshold of the pump body and the temperature threshold of the motor are divided into three stages.

[0046] When the pump body temperature is low at T C1 When the temperature of the pump body is within T, the pump body is cooled only by the first cooling medium with a higher temperature; when the temperature of the pump body is at T C2 When the pump body is at a high temperature, the pump body is cooled by mixing the first cooling medium with the second cooling medium to form a cooling medium between the first cooling medium and the second cooling medium; when the pump body temperature is high, the pump body is at T C3 When the pump is cooled, the pump body is cooled by the second cooling medium.

[0047] When the motor temperature is low at T M1 When the temperature of the motor is within T, the motor is cooled only by the first cooling medium with a higher temperature; when the temperature of the motor is within T M2 When the motor temperature is high, the motor is cooled by mixing the first cooling medium with the second cooling medium to form a cooling medium between the first cooling medium and the second cooling medium; when the motor temperature is high, the motor is cooled by mixing the first cooling medium with the second cooling medium to form a cooling medium between the first cooling medium and the second cooling medium. M3When the motor is cooled, the second cooling medium is used to cool the motor.

[0048] At the same time, according to the temperature of the pump body and the temperature of the motor, the booster pump 100 and the pressure pump 103 on the first medium delivery pipeline 13 and the second medium delivery pipeline 14 are started and stopped in different relationships, thereby ensuring the cooling effect of the pump body and the motor while reducing the consumption of electric energy.

[0049] Embodiment 11: This embodiment provides a control method for a vacuum pump safety control system, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0050] In step 6, the vacuum pump control module sets the output power of the booster pump 100 of the first medium delivery pipeline 13 according to different working modes of the vacuum pump, including W 增1 With W 增2 ; Set the output power of the booster pump 103, including W 加1 With W 加2 ; and W 增1 <W 增2 , W 加1 <W 加2 ; The output power of the booster pump 100 of the second medium delivery pipeline 14 is set, including W 增3 With W 增4 ; Set the output power of the booster pump 103, including W 加3 With W 加4 ; and W 增3 <W 增4 , W 加3 <W 加4 ; If the pump body temperature is T C1 and the motor temperature is T M1 When the output power of the booster pump 100 in the first medium delivery pipeline 13 is W 增2 , the output power of the booster pump 103 is W 加2 ; If the pump body temperature is T C1 , motor temperature at T M2 When the pump body temperature is T C2 Internal, motor temperature is internal T M1 When the booster pump 100 and the pressure pump 103 of the first cooling medium delivery pipeline and the booster pump 100 of the second medium delivery pipeline 14 are started simultaneously, the output powers are W respectively. 增2 , W 加1 With W 增3 ; If the pump body temperature is T C2 and the motor temperature is TM2 When the pressure pump 100 and the pressure pump 103 of the first medium delivery pipeline 13 and the pressure pump 100 of the second medium delivery pipeline 14 are started at the same time, and the output power is W respectively. 增2 , W 加1 With W 增4 ; If the pump body temperature is T C2 Internal and motor temperature at T M3 When the pump body temperature is T C3 Internal and motor temperature at T M2 When the booster pump 100 of the first medium delivery pipeline 13 and the booster pump 100 and the pressure pump 103 of the second medium delivery pipeline 14 are started simultaneously, the output powers are W and W respectively. 增1 , W 增4 With W 加3 ; If the pump body temperature is T C3 and the motor temperature is T M3 When the pressure pump 100 and the pressure pump 103 of the second medium delivery pipeline 14 are started simultaneously, the output powers are W and W respectively. 增4 With W 加4 ; If the pump body temperature is less than T C1 Or the motor temperature is less than T M1 When only the booster pump 100 of the first medium delivery pipeline 13 is started, the power is W 加1 .

[0051] In this embodiment, the vacuum pump control module controls the two output powers of the booster pump 100 and the pressure pump 103 on the first medium delivery pipeline 13 and the second medium delivery pipeline 14 according to the temperature of the pump body and the motor, thereby ensuring the cooling effect while ensuring the cooling of the pump body and the motor, reducing the consumption of electric energy, and improving the utilization rate of the first cooling medium and the second cooling medium.

[0052] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the inspiration of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A vacuum pump safety control system, characterized in that: include: A vacuum pump cooling module is used to cool the vacuum pump; Vacuum pump operation monitoring module, to detect the operation data of the vacuum pump; Vacuum pump operation monitoring module, detecting the working data of the vacuum pump; A vacuum pump environment detection module detects the environmental data of the environment in which the vacuum pump is located; The vacuum pump safety protection module changes the operating state of the vacuum pump in time when the vacuum pump operates abnormally; The vacuum pump control module receives the data detected by the vacuum pump operation monitoring module, the vacuum pump work monitoring module and the vacuum pump environment detection module, and determines the operation status of the vacuum pump after processing the data, and controls the operation of the vacuum pump cooling module and the vacuum pump safety protection module according to the vacuum operation status.

2. A vacuum pump safety control system according to claim 1, characterized in that: The vacuum pump cooling module comprises: A pump body delivery pipeline (1) having a pump body delivery valve (2) thereon for delivering a cooling medium to cool the vacuum pump body (111); A motor delivery pipeline (3) having a motor delivery valve (4) thereon for delivering a cooling medium to cool the vacuum pump motor (112); A cooling return pipeline (5) for receiving a cooling medium heated after cooling a vacuum pump body (111) and a vacuum pump motor (112); A cooling shunt circuit, used for cooling the heated cooling medium transported by the cooling return line (5); The cooling boost pipeline is used to transport cooling medium to the pump body delivery pipeline (1) and / or the motor delivery pipeline (3).

3. A vacuum pump safety control system according to claim 2, characterized in that: The cooling shunt circuit comprises: A first cooler (6), the inlet end of which is connected to the cooling return pipeline (5); A cooling branch pipeline (7), one end of which is connected to the outlet end of the first cooler (6), and the other end of which is connected in parallel to two cooling branch pipes (8), and each cooling branch pipe (8) is provided with a cooling control valve (9); A first cooling chamber (10), the inlet end of which is connected to the outlet end of one of the cooling branch pipes (8); A second cooler (11), the inlet end of which is connected to the outlet end of another cooling branch pipe (8); The inlet end of the second cooling chamber (12) is connected to the outlet end of the second cooler (11) via a pipeline.

4. A vacuum pump safety control system according to claim 3, characterized in that: The cooling boost line includes: A first medium delivery pipeline (13) for delivering the cooling medium in the first cooling chamber (10) to the pump body delivery pipeline (1) and / or the motor delivery pipeline (3); A second medium delivery pipeline (14) for delivering the cooling medium in the second cooling chamber (12) to the pump body delivery pipeline (1) and / or the motor delivery pipeline (3); The first medium delivery pipeline (13) and the second medium delivery pipeline (14) both include: A booster pump (100), the inlet end of which is connected to the outlet of the first cooling chamber (10) or the second cooling chamber (12); A pressure boosting circuit (101) having a pressure boosting control valve (102) and a pressure boosting pump (103); A pressure-maintaining circuit (104) having a pressure-maintaining control valve (105); Two flow branch passages (107) each having a flow branch control valve (108), one outlet of which is connected to the pump body delivery pipeline (1) and the other outlet of which is connected to the motor delivery pipeline (3); The inlet ends of the boosting circuit (101) and the pressure-maintaining circuit (104) are respectively connected to the outlet end of the boosting pump (100); the outlet ends of the boosting circuit (101) and the pressure-maintaining circuit (104) are combined and connected to a flow diversion pipe (106); the other end of the flow diversion pipe (106) is respectively connected to two flow diversion branches (107).

5. A vacuum pump safety control system according to claim 1, characterized in that: The vacuum pump operation monitoring module comprises: A pump body temperature monitor, used to detect the real-time temperature of the vacuum pump body (111); A motor temperature monitor, used to detect the real-time temperature of the vacuum pump motor (112); A voltage monitor, used to detect the real-time voltage of the vacuum pump motor (112); A current monitor, used to detect the real-time current of the vacuum pump motor (112); The speed monitor is used to detect the real-time speed of the screw when the vacuum pump is running.

6. A vacuum pump safety control system according to claim 1, characterized in that: The vacuum pump operation monitoring module comprises: Intake monitor, used to detect the real-time flow rate at the intake end of the vacuum pump; Exhaust monitor, used to detect the real-time flow rate at the exhaust end of the vacuum pump; The vacuum pump environment detection module comprises: External temperature monitor, used to detect the temperature of the environment where the vacuum pump is located; A flow detector is used to detect the air flow in the environment where the vacuum pump is located; The vacuum pump safety protection module comprises: The front protector is used to forcibly interrupt the operation of the vacuum pump when an abnormality occurs in the vacuum pump; The alarm is used to sound an alarm when an abnormality occurs in the vacuum pump.

7. A control method applicable to the vacuum pump safety control system according to any one of claims 4 to 6, characterized in that: Step 1: establishing a threshold value. A threshold model of the vacuum pump is established according to the vacuum pump operating under different output powers, including a pump body temperature threshold, a motor temperature threshold, a voltage threshold, a current threshold, an intake threshold, an exhaust threshold, and a speed threshold. Step 2: external data acquisition, obtaining the ambient temperature and air flow rate of the environment where the vacuum pump is located; Step 3: Acquire operation data to obtain real-time data of the vacuum pump operation, including pump body temperature, motor temperature, motor voltage, motor current, vacuum pump intake flow, vacuum pump exhaust flow, and screw speed; Step 4: threshold calibration, calibrating the threshold according to external data, including pump body temperature threshold calibration, motor temperature threshold calibration, air pump intake flow calibration and vacuum pump exhaust flow calibration; Step 5: data comparison: comparing the obtained operation data of the vacuum pump with the corresponding threshold model to determine whether the operation of the vacuum pump is abnormal; Step six, vacuum pump operation control, control the output status of the vacuum pump cooling module according to the operation status of the vacuum pump, and stop the operation of the vacuum pump when the vacuum pump operates abnormally.

8. The control method according to claim 7, characterized in that: In step 5, the vacuum pump is judged to be operating abnormally including: Vacuuming abnormality: if the vacuum pump intake flow rate is not within the intake threshold and / or the vacuum pump exhaust flow rate is not within the exhaust threshold, it is judged as vacuuming abnormality; The vacuum pump is operating abnormally. If the pump body temperature exceeds the pump body temperature threshold and / or the screw speed is not within the speed threshold, it is judged that the vacuum pump is operating abnormally; The motor is running abnormally, and the motor temperature exceeds the motor temperature threshold and / or the voltage is not within the voltage threshold and / or the current is not within the current threshold.

9. The control method according to claim 8, characterized in that: In step six, when the vacuum pump operates abnormally and continues for a period of time, the vacuum pump control module will forcibly interrupt the operation of the vacuum pump and sound an alarm through the alarm.

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