Voltage Stabilization System and Method

Abstract

The present invention belongs to the technical field of vacuum pump system control, and particularly relates to a pressure stabilizing system and method. The pressure stabilizing system provided by the present invention uses a cyclone separator to remove uncooled moisture. A vacuum buffer tank is connected to a vacuum pump. The vacuum pump is provided with a reflux pipeline, and the reflux pipeline is provided with a regulating valve. The regulating valve is connected to the pressure gauge of the cyclone separator. The opening degree of the regulating valve of the vacuum pump reflux pipeline is adjusted through the pressure gauge of the cyclone separator to stabilize the pressure at a set value. The present invention can stabilize the pressure of the system within ±1 kPa, and the pressure adjustable range is between -1 kPa and atmospheric pressure.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum pump system control, and particularly relates to a voltage stabilizing system and method. Background Art

[0002] Due to processing different systems, the pressure in the production process needs to be adjusted accordingly and stabilized at a specific value. To simulate the on-site production situation, a stable specific pressure needs to be set in the distillation experiment device during the test experiment. Usually, a vacuum pump is used to meet the specific pressure of the experimental system, but the stability of the specific pressure value cannot be guaranteed by the vacuum pump. And the pressure range when achieving vacuum can only be adjusted according to the vacuum pump. The vacuum pump uses a constant frequency pump, and the CV value can only be within a fixed range, and it is impossible to achieve the adjustment of a wider experimental pressure beyond the CV value. Summary of the Invention

[0003] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a voltage stabilizing system and method, aiming to solve the technical problem that the pressure range when achieving vacuum can only be adjusted according to the vacuum pump. The vacuum pump uses a constant frequency pump, and the CV value can only be within a fixed range, and it is impossible to achieve the adjustment of a wider experimental pressure beyond the CV value.

[0004] The voltage stabilizing system provided by the present invention has the following specific technical solutions:

[0005] The voltage stabilizing system includes a PLC controller, a vacuum pump, a vacuum buffer tank and a cyclone separator arranged between the vacuum pump and the equipment to be voltage stabilized. The air inlet of the cyclone separator is connected to the air outlet of the equipment to be voltage stabilized, the air outlet of the cyclone separator is connected to the vacuum buffer tank, a first pressure gauge is arranged on the cyclone separator, the vacuum pump is connected to the vacuum buffer tank through a return pipeline, a regulating valve is arranged on the return pipeline, the regulating valve is electrically connected to the first pressure gauge, and the PLC controller is electrically connected to the regulating valve and the first pressure gauge.

[0006] In some embodiments, a coil is arranged inside the cyclone separator. The two ends of the coil are communicated with the air inlet and the air outlet of the cyclone separator. The cyclone separator is also provided with a chilled water inlet and a chilled water outlet, and a cooling water channel is formed between the chilled water inlet and the chilled water outlet.

[0007] Further, a gas vent pipe is arranged on the pipeline connecting the air outlet of the cyclone separator to the vacuum buffer tank, and a stop valve is connected to the gas vent pipe.

[0008] Still further, a silencer is also connected to the gas vent pipe.

[0009] In some embodiments, a second pressure gauge is connected to the top of the vacuum buffer tank.

[0010] The present invention also provides a second technical solution, namely a voltage stabilization method. Based on the above voltage stabilization system, it includes the following steps:

[0011] S1. Open the vacuum pump to extract the gas in the system to form a negative pressure;

[0012] S2. Set the maximum and minimum pressures on the PLC controller;

[0013] S3. The first pressure gauge transmits the pressure signal to the PLC controller. It is judged according to the maximum and minimum pressures set in step S2. If it exceeds the maximum pressure, the opening degree of the regulating valve is increased through the PLC controller; if it is lower than the minimum pressure, the opening degree of the regulating valve is decreased through the PLC controller.

[0014] In some embodiments, in step S1, the regulating stop valve adjusts the flow rate of the pipeline connecting the air outlet of the cyclone separator to the vacuum buffer tank through the gas-phase vent pipe, and cascades with the PLC controller to regulate the pressure.

[0015] The present invention has the following beneficial effects: The voltage stabilization system provided by the present invention uses a cyclone separator to remove uncooled moisture. The vacuum buffer tank is connected to the vacuum pump. The vacuum pump is provided with a reflux pipeline, and the reflux pipeline is provided with a regulating valve. The regulating valve is connected to the pressure gauge of the cyclone separator. The opening degree of the regulating valve of the vacuum pump reflux pipeline is adjusted through the pressure gauge of the cyclone separator to stabilize the pressure at the set value. The present invention can stabilize the pressure of the system within ±1 kPa, and the pressure adjustable range is between -1 kPa and normal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the voltage stabilization system provided in Embodiment 1 of the present invention;

[0017] Figure 2 is a flow chart of the voltage stabilization method provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail with reference to specific embodiments and the attached Figure 1-2 , and further elaborates on the present invention.

[0019] Embodiment 1

[0020] The voltage stabilization system provided in this embodiment has the following specific technical solutions:

[0021] Voltage stabilizing system, including a PLC controller 1, a vacuum pump 2, a vacuum buffer tank 4 and a cyclone separator 5 arranged between the vacuum pump 2 and the equipment 3 to be voltage stabilized. The air inlet of the cyclone separator 5 is connected to the air outlet of the equipment 3 to be voltage stabilized, the air outlet of the cyclone separator 5 is connected to the vacuum buffer tank 4, a first pressure gauge 51 is provided on the cyclone separator 5, the vacuum pump 2 is connected to the vacuum buffer tank 4 through a return pipeline 6, a regulating valve 61 is provided on the return pipeline 6, the regulating valve 61 is electrically connected to the first pressure gauge 51, and the PLC controller 1 is electrically connected to the regulating valve 61 and the first pressure gauge 51. The vacuum pump 2 evacuates the equipment that needs voltage stabilization, so that the equipment 3 to be voltage stabilized can reach the specified pressure value. By setting the regulating valve 61 on the return pipeline 6, the short-circuit operation of the vacuum pump can be realized. According to the feedback of the pressure value by the first pressure gauge 51, the regulating valve 61 provided on the return pipeline 6 regulates the pressure value of the whole system. The vacuum buffer tank 4 is used to buffer the pressure of the vacuum pump 2 on the equipment 3 to be voltage stabilized, prevent backflow, and can also be used for gas-liquid separation to achieve a stable vacuum degree. In this embodiment, the PLC controller 1 is a PIC single-chip microcomputer.

[0022] In some embodiments, a coil pipe is provided inside the cyclone separator 5. Both ends of the coil pipe are connected to the air inlet and the air outlet of the cyclone separator 5. The cyclone separator 5 is also provided with a chilled water inlet 52 and a chilled water outlet 53, and a cooling water channel is formed between the chilled water inlet 52 and the chilled water outlet 53. The cyclone separator 5 is used to remove the uncooled moisture during the evacuation process. The chilled water inlet 52 is used for the entry of chilled water (heat transfer medium), and the chilled water outlet 53 is used for the discharge of chilled water (heat transfer medium). When the gas containing moisture flows through the coil pipe under the action of the chilled water, the moisture therein is cooled and separated from the gas, so as to ensure that the gas is not easily filled with water vapor.

[0023] Furthermore, a gas-phase vent pipe 54 is provided on the pipeline connecting the air outlet of the cyclone separator 5 to the vacuum buffer tank 4. A silencer 55 and a stop valve 56 are connected to the gas-phase vent pipe 54. The gas-phase vent pipe 54 is used to break the vacuum. The stop valve 56 is used to control the flow rate of the pipeline gas (adjusted according to the set pressure range), and the silencer 55 is used to remove the noise generated in the pipeline due to the relatively fast gas flow rate.

[0024] In some embodiments, a first vent pipe 62 is also connected to the return pipeline 6. The first vent pipe 62 is used to prevent the vacuum pump 2 from generating a large pressure and is used for pressure relief.

[0025] In some embodiments, a second pressure gauge 41 is connected to the top of the vacuum buffer tank 4. The second pressure gauge 41 is used to observe the pressure of the vacuum buffer tank 4.

[0026] In some embodiments, a second vent pipe 42 is connected to the top of the vacuum buffer tank 4. The second vent pipe 42 is used to release the pressure in the vacuum buffer tank 4.

[0027] Example 2

[0028] Based on the system of Example 1, this example proposes a voltage stabilization method, including the following steps:

[0029] S1. Open the vacuum pump 2 to extract the gas in the system to form a negative pressure;

[0030] S2. Set the pressure threshold on the PLC controller 1;

[0031] S3. The first pressure gauge 51 transmits the pressure signal to the PLC controller 1. The PLC controller 1 judges according to the maximum and minimum pressure values set in step S2. If it exceeds the maximum pressure value, the opening degree of the regulating valve 61 is increased through the PLC controller 1; if it is lower than the minimum pressure value, the opening degree of the regulating valve 61 is reduced through the PLC controller.

[0032] Since the adjustable range of the regulating valve 61 is from 2 kPa to 30 kPa (absolute pressure), but the pressure beyond this range cannot be accurately regulated. Therefore, a shut-off valve 56 is added to the top of the cyclone separator 5, and coarse adjustment is achieved through the shut-off valve 56. Then, the PLC controller 1 uses the regulating valve 61 to achieve precise pressure regulation, so as to achieve the purpose of cascade regulation of the pressure between the shut-off valve 56 and the PLC controller 1. After adding the cascade regulation of the shut-off valve 56, the regulation range is 2 kPa - 80 kPa (absolute pressure). The silencer 55 is used to eliminate the noise generated when the gas flows through the shut-off valve 56.

[0033] The above is only a preferred and feasible embodiment of the present invention, and it is not a limitation to the present invention. The present invention is not limited to the above examples. Those skilled in the art of this technology, within the scope of the essence of the present invention, the changes, modifications, additions or substitutions made should also fall within the protection scope of the present invention.

Claims

1. Voltage stabilization system, characterized in that, It includes a PLC controller, a vacuum pump, a vacuum buffer tank and a cyclone separator arranged between the vacuum pump and the device requiring pressure stabilization, the air inlet of the cyclone separator is connected to the air outlet of the device requiring pressure stabilization, the air outlet of the cyclone separator is connected to the vacuum buffer tank, the cyclone separator is provided with a first pressure gauge, the vacuum pump is connected to the vacuum buffer tank through a return line, a regulating valve is provided on the return line, the regulating valve is electrically connected to the first pressure gauge, and the PLC controller is electrically connected to the regulating valve and the first pressure gauge ; The return pipeline is also connected to a first vent pipe, which is used for pressure release; a coil is provided in the cyclone separator, and both ends of the coil are connected to the air inlet and the air outlet of the cyclone separator, and the cyclone separator is also provided with a chilled water inlet and a chilled water outlet, and a cooling water channel is formed between the chilled water inlet and the chilled water outlet; a gas phase vent pipe is provided on the pipeline connecting the air outlet of the cyclone separator to the vacuum buffer tank, and a stop valve is connected to the gas phase vent pipe; the gas phase vent pipe is also connected to a muffler; In step S1, the vacuum pump is turned on to extract the gas in the system to form a negative pressure; in step S2, the maximum and minimum pressure values are set on the PLC controller; in step S3, the first pressure gauge transmits the pressure signal to the PLC controller, and the pressure signal is judged based on the maximum and minimum pressure values set in step S2. If the pressure exceeds the maximum value, the PLC controller increases the opening of the regulating valve; if the pressure is lower than the minimum value, the PLC controller decreases the opening of the regulating valve; In step S1, the shut-off valve adjusts the flow rate of the pipeline connecting the gas outlet of the cyclone separator to the vacuum buffer tank through the gas phase vent pipe, and adjusts the pressure in cascade with the PLC controller.

2. The voltage stabilizing system according to claim 1, characterized in that: The top of the vacuum buffer tank is connected to a second pressure gauge.

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