A volumetric vacuum pump protection device

Abstract

The utility model provides a kind of volumetric vacuum pump protection device, including purging unit and controller, purging unit is connected the inlet end of volumetric vacuum pump by purging pipeline, and pressure regulating valve, purging gas pressure gauge, purging protection valve are equipped on purging pipeline, the inlet end of volumetric vacuum pump is also connected to vacuum pipeline, vacuum pipeline other end is connected to be pumped equipment, and vacuum pipeline is equipped with vacuum air valve, pipeline vacuum gauge;Vacuum air valve, pipeline vacuum gauge, pressure regulating valve are connected with controller respectively;Controller is used to collect the data of purging gas pressure gauge, pipeline vacuum gauge, and controls the opening and closing of pressure regulating valve, vacuum air valve, purging protection valve.It solves the technical problem that pump body can store liquid water and cannot be discharged after volumetric vacuum pump is completed to the equipment of pumping, leading to the corrosion of pump's moving parts, scale and flow passage blockage, and overload jamming phenomenon appears when running again.The utility model can be widely applied in volumetric vacuum pump.

Description

Technical Field

[0001] This utility model relates to a protection device, and more particularly to a protection device for a positive displacement vacuum pump. Background Technology

[0002] During the high vacuum extraction process of vacuum ring mold equipment, positive displacement vacuum pumps (such as screw pumps, rotary vane pumps, and vortex pumps) are used in the roughing stage. When high water vapor media (such as steam and humid air) are drawn into the pump body, the water vapor will condense into liquid water due to the change in saturated vapor pressure. As the pressure of the container being pumped decreases, the liquid water remaining in the vacuum pump cannot be discharged. When the vacuum pump stops working for a period of time, the water in the pump body can easily cause corrosion, scaling, and blockage of the pump's moving parts, eventually leading to overload and seizure of the vacuum pump during the next operation. Summary of the Invention

[0003] This invention addresses the technical problem of existing positive displacement vacuum pumps where liquid water remains inside the pump body after evacuation, leading to corrosion, scaling, and blockage of the pump's moving parts, and causing overload and jamming during subsequent operation. The invention provides a simple, reliable, and effective positive displacement vacuum pump protection device that promptly removes liquid water from the pump, prevents damage to moving parts, and extends the pump's service life.

[0004] Therefore, the technical solution of this utility model is a positive displacement vacuum pump protection device, including a purging unit and a controller. The purging unit is connected to the inlet end of the positive displacement vacuum pump through a purging pipeline. The purging pipeline is equipped with a pressure regulating valve, a purging gas pressure gauge, and a purging protection valve. The inlet end of the positive displacement vacuum pump is also connected to a vacuum pumping pipeline. The other end of the vacuum pumping pipeline is connected to the equipment being evacuated. The vacuum pumping pipeline is equipped with a vacuum extraction valve and a pipeline vacuum gauge. The vacuum extraction valve, the pipeline vacuum gauge, and the pressure regulating valve are respectively connected to the controller. The controller is used to collect data from the purging gas pressure gauge and the pipeline vacuum gauge, and to control the opening and closing of the pressure regulating valve, the vacuum extraction valve, and the purging protection valve.

[0005] Preferably, the pipeline vacuum gauge is installed on the vacuum pumping pipeline at the rear end of the vacuum pumping valve.

[0006] Preferably, the purge gas pressure gauge and the purge protection valve are respectively connected to the controller.

[0007] Preferably, a temperature sensor is provided on the outlet pipeline of the positive displacement vacuum pump, and the temperature sensor is connected to the controller.

[0008] The beneficial effects of this utility model are:

[0009] (1) This utility model uses the controller to collect data from the vacuum pumping valve and the pipeline vacuum gauge to determine whether the positive displacement vacuum pump has completed the evacuation of the vacuum equipment. When the vacuum level in the vacuum pipeline reaches the required value, the purging unit can be started to blow the liquid water in the positive displacement vacuum pump with purging gas. The whole process is controlled by the controller and does not require manual operation. It has a high degree of intelligence and reliable operation. This solution can effectively solve the problem of liquid water remaining in the positive displacement vacuum pump after operation, reduce the number of maintenance times of the positive displacement vacuum pump, save costs and extend the service life of the pump.

[0010] (2) By installing a temperature sensor at the outlet of the positive displacement vacuum pump, the temperature of the medium at the pump outlet is collected in a timely manner and uploaded to the controller. The temperature is used to determine whether there is still liquid water to be purged in the pump. When the pump is clean, the relevant valves on the purging pipeline are closed in time to avoid waste. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0012] Figure 2 This is a flowchart illustrating an embodiment of the present utility model;

[0013] Figure 3 This is another flowchart of an embodiment of the present utility model.

[0014] Explanation of symbols in the diagram:

[0015] 1. Vacuuming equipment; 2. Vacuum pumping valve; 3. In-line vacuum gauge; 4. Purge gas container; 5. Pressure regulating valve; 6. Purge gas pressure gauge; 7. Purge protection valve; 8. Vacuuming pipeline; 9. Positive displacement vacuum pump; 10. Pump outlet pipeline; 11. Temperature sensor; 12. Purge pipeline. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments.

[0017] like Figure 1As shown, a positive displacement vacuum pump protection device includes a purging unit and a controller. The purging unit is equipped with a purging gas container 4, which is connected to the inlet of a positive displacement vacuum pump 9 via a purging pipeline 12. The purging pipeline 12 is equipped with a pressure regulating valve 5, a purging gas pressure gauge 6, and a purging protection valve 7. A vacuum extraction pipeline 8 is connected at one end to the vacuum-treated equipment 1 and at the other end to the inlet of the positive displacement vacuum pump 9. The vacuum extraction pipeline 8 is equipped with a vacuum extraction valve 2 and a pipeline vacuum gauge 3. The vacuum extraction pipeline 8 and the purging pipeline 12 are connected in parallel. The vacuum extraction valve 2, the pipeline vacuum gauge 3, the purging gas pressure gauge 6, the purging protection valve 7, and the pressure regulating valve 5 are all connected to the controller. The pipeline vacuum gauge 3 is located on the vacuum extraction pipeline 8 downstream of the vacuum extraction valve 2. A temperature sensor 11 is installed on the outlet pipeline 10 of the positive displacement vacuum pump 9, and the temperature sensor 11 is also connected to the controller.

[0018] A method for protecting a positive displacement vacuum pump using the above-mentioned device, such as... Figure 2-3 As shown, the specific steps are as follows:

[0019] S1: The controller reads the opening and closing signals of the vacuum pumping valve 2 and the data of the pipeline vacuum gauge 3 to determine the working status of the volumetric vacuum pump 9. The working status of the volumetric vacuum pump 9 includes the vacuuming stage, the vacuum level reaching the standard stage, and the purging stage.

[0020] S2: When the working state of the positive displacement vacuum pump 9 reaches the vacuum level standard stage, the controller opens the pressure regulating valve 5, and the higher pressure purging gas enters the positive displacement vacuum pump 9 through the purging pipeline 12, carrying out the liquid water in the positive displacement vacuum pump 9 and discharging it through the outlet of the positive displacement vacuum pump 9.

[0021] S3: Temperature sensor 11 on outlet pipeline 10 of positive displacement vacuum pump 9 monitors the exhaust port temperature of vacuum pump and transmits it to controller. After the purging process starts, controller monitors exhaust port temperature in real time. As the purging process proceeds, exhaust port temperature will gradually increase.

[0022] The purge gas pressure gauge 6 monitors the gas pressure in the purge pipeline and transmits the pressure data to the controller. When the gas pressure is greater than the set value, the controller reduces the opening of the pressure regulating valve 5 and simultaneously opens the purge protection valve 7 to reduce the gas pressure in the purge pipeline 12. When the gas pressure is less than the set value, the controller increases the opening of the pressure regulating valve 5 and simultaneously opens the purge protection valve 7 to increase the gas pressure in the purge pipeline 12.

[0023] When the controller detects that the temperature on the outlet pipeline of the positive displacement vacuum pump 9 is higher than 65°C and lasts for three minutes, the controller controls the pressure regulating valve 5 and the purging protection valve 7 to close, and the positive displacement vacuum pump 9 stops running, completing the purging process.

[0024] The required vacuum level in the vacuuming equipment 1 is preset in the controller. When the vacuum pump valve 2 is open and the value of the pipeline vacuum gauge 3 has not reached the required vacuum level, the positive displacement vacuum pump 9 is in the vacuuming stage. When the vacuum pump valve 2 is open and the value of the pipeline vacuum gauge 3 reaches the required vacuum level, the positive displacement vacuum pump 9 is in the vacuum compliance stage. After the positive displacement vacuum pump 9 enters the vacuum compliance stage, the vacuum pump valve 3 is closed, and the positive displacement vacuum pump 9 enters the purging stage.

[0025] The controller collects readings from the pipeline vacuum gauge 3, purge gas pressure gauge 6, and temperature sensor 11. It reads the operating status of the vacuum pumping valve 2, the positive displacement vacuum pump 9, the pressure regulating valve 5, and the purge protection valve 7. Through logical judgment, it controls the opening and closing of the vacuum pumping valve 2 and the purge protection valve 7, adjusts the opening of the pressure regulating valve 5, and controls the start and stop of the positive displacement vacuum pump 9. The purge process occurs after vacuuming is completed and before the positive displacement vacuum pump 9 stops working. During purge, the vacuum pumping valve 2 should be closed under the control of the controller. During vacuuming, the pressure regulating valve 5 and the purge protection valve 7 on the purge pipeline 12 are closed.

[0026] This invention uses a controller to collect data from the vacuum pumping valve 2 and the pipeline vacuum gauge 3 to determine whether the positive displacement vacuum pump 9 has completed evacuating the vacuum equipment 1. When the vacuum level in the vacuum pipeline 8 reaches the required value, the purging unit can be activated to use purging gas to carry out the liquid water in the positive displacement vacuum pump 9. The entire process is controlled by the controller and does not require manual operation. It has a high degree of intelligence and reliable operation. This solution can effectively solve the problem of liquid water residue in the positive displacement vacuum pump 9 after operation, avoid corrosion of rotating parts inside the pump, reduce the number of maintenance times of the positive displacement vacuum pump 9, save costs, and extend the service life of the pump. By setting a temperature sensor 11 on the outlet pipeline 10 of the positive displacement vacuum pump 9 to collect the temperature of the medium at the pump outlet in a timely manner and upload it to the controller, the temperature can be used to determine whether there is still liquid water to be purged in the pump. When it is clean, the relevant valves on the purging pipeline are closed in time to avoid waste.

[0027] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A device for protecting a positive displacement vacuum pump, characterized in that The system includes a purging unit and a controller. The purging unit is connected to the inlet of a positive displacement vacuum pump via a purging pipeline. The purging pipeline is equipped with a pressure regulating valve, a purging gas pressure gauge, and a purging protection valve. The inlet of the positive displacement vacuum pump is also connected to a vacuum pumping pipeline, the other end of which is connected to the equipment being evacuated. The vacuum pumping pipeline is equipped with a vacuum extraction valve and a pipeline vacuum gauge. The vacuum extraction valve, pipeline vacuum gauge, and pressure regulating valve are respectively connected to the controller. The controller is used to collect data from the purging gas pressure gauge and the pipeline vacuum gauge, and to control the opening and closing of the pressure regulating valve, vacuum extraction valve, and purging protection valve.

2. A device according to claim 1, characterized in that The purging unit is equipped with a purging gas container, which is connected to the inlet of a positive displacement vacuum pump through the purging pipeline.

3. A device according to claim 1, characterized in that The pipeline vacuum gauge is installed on the vacuum pumping pipeline at the rear end of the vacuum pumping valve.

4. A device according to claim 1, characterized in that The purge gas pressure gauge and the purge protection valve are respectively connected to the controller.

5. The positive displacement vacuum pump protection device according to claim 1, characterized in that, A temperature sensor is installed on the outlet pipeline of the positive displacement vacuum pump, and the temperature sensor is connected to the controller.

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