Coil constant-pressure pump station controlled by vacuum degree

Abstract

The utility model belongs to the technical field of transformer coil production, and discloses a coil constant-pressure pump station adopting vacuum degree control. Comprising a gas phase drying tank, and further comprises a control system which comprises an industrial personal computer and a PLC module electrically connected with the industrial personal computer; the industrial personal computer is used for controlling the pressing force and time of the transformer coil; the PLC module is used for realizing information interaction, receiving parameter data of the transformer coil, transmitting parameters of the transformer coil to the industrial personal computer, and adjusting the magnitude and time of pressure applied to the transformer coil; the hydraulic system is used for detecting the pressure of the coil and transmitting the pressure to the PLC module; and the vacuum pressure gauge is arranged in the gas phase drying tank, is electrically connected with the PLC module, and transmits the detected vacuum pressure to the PLC module. Through combination of the vacuum pressure gauge and the PLC module, combination of vacuum pressure and a hydraulic system is achieved, the pressing force of the transformer coil is adjusted in combination with the vacuum pressure, and the pressing effect of the transformer coil is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer coil production, and specifically relates to a coil constant pressure pumping station with vacuum degree control. Background Art

[0002] The insulation drying operation of transformer coils commonly uses the vacuum vapor drying technology at home and abroad. The whole technological process is divided into a preparation stage, a heating stage, a pressure reduction stage, and a high vacuum stage. During the drying process of the transformer coil, a hydraulic system is also required to press the coil successively in a certain proportion according to the pressure required by the process. The insulation drying operation of the transformer coil is a crucial process in the transformer manufacturing process, which has an important impact on the final quality of the transformer.

[0003] In the current technology, the existing hydraulic pumping stations can press multiple groups of coils according to different process parameters. During the pressing process of the transformer coil, the hydraulic pumping station can control the sectional pressure magnitude through time. For example, first press at 60% of the rated process pressure for a specific period of time; then increase to 100% of the rated process pressure for a specific period of time; then decrease to 60% of the rated process pressure for a specific period of time; after repeating the above cycle several times, finally press again at 100% of the rated process pressure.

[0004] During the constant pressure drying process of the transformer coil, there is a certain relationship between the vacuum degree in the tank and the coil pressing force. These two factors affect each other and jointly determine the drying effect and quality of the coil.

[0005] The relationship between the vacuum degree in the tank and the pressing force is reflected in the following three aspects:

[0006] 1. The vacuum degree can reduce the evaporation temperature of water, while the pressing force can ensure the tightness of the coil structure. The combination of the two helps to quickly and evenly discharge water.

[0007] 2. Excessive pressing force may cause the coil material to be deformed or damaged under vacuum conditions, so it is necessary to reasonably control the pressing force while ensuring the vacuum degree.

[0008] 3. If there is no reasonable balance between the vacuum degree and the pressing force, it may cause residual moisture inside the coil after drying or the coil to be loose due to insufficient pressing, thereby affecting the mechanical strength of the transformer coil.

[0009] Currently, the hydraulic pumping station can only control the coil pressing force according to time, lacking linkage with the vacuum degree, and the constant pressure drying effect and quality of the transformer coil are average. Content of the Utility Model

[0010] The purpose of the present utility model is to provide a coil constant pressure pumping station controlled by vacuum degree to solve the problems raised in the above-mentioned background technology.

[0011] To achieve the above object, the present utility model provides the following technical solution: A coil constant pressure pumping station controlled by vacuum degree, including a gas-phase drying tank. Among them, it also includes,

[0012] A control system, including an industrial control computer and a PLC module electrically connected to the industrial control computer;

[0013] The industrial control computer is used to control the pressing force and time of the transformer coil;

[0014] The PLC module is used to realize information interaction, receive the parameter data of the transformer coil and transfer the parameters of the transformer coil to the industrial control computer, and adjust the magnitude and time of the applied pressure on the transformer coil; A hydraulic system that detects the pressure of the coil and transmits the pressure to the PLC module;

[0015] A vacuum pressure gauge is arranged in the gas-phase drying tank and electrically connected to the PLC module, and transmits the detected vacuum pressure to the PLC module. By combining the vacuum pressure gauge with the PLC module, the combination of vacuum pressure and the hydraulic system is realized, and the pressing force of the variable pressure coil is adjusted in combination with the vacuum pressure to improve the pressing effect of the transformer coil.

[0016] According to the present utility model, further, the hydraulic system includes a pressure output port connected to the pressing plate of the transformer coil; A pressing plate solenoid valve for controlling the on / off of its pressure and a pressure sensor for collecting the pressure value of the pressure output port are arranged at the pressure output port; The pressure sensor transmits the detected vacuum pressure data to the PLC module.

[0017] According to the present utility model, further, the hydraulic system also includes a first electric pump for controlling its on / off.

[0018] According to the present utility model, further, the hydraulic system also includes a second electric pump for controlling its on / off, which does not work simultaneously with the first electric pump. The non-working one is used as a backup to improve the stability of the hydraulic system. Even if one of the electric pumps breaks down, the second electric pump can be immediately put into operation without affecting the operation of the hydraulic system.

[0019] According to the present utility model, further, when the number of the pressure output ports is more than two, each pressure output port is independent of each other; The pressing plate solenoid valve and the pressure sensor arranged at the pressure output port are also independent of each other. The relative independent control of the pressing force and pressing time during the pressing process is realized, which is convenient for extra pressing of a certain specific coil and improves the overall pressing effect and quality of the transformer coil.

[0020] According to the present utility model, further, it includes a system solenoid valve for controlling the first electric pump or the second electric pump to supply oil to the system.

[0021] According to the present utility model, further, it also includes a system relief valve to provide overload protection for the hydraulic system.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model enables the hydraulic pump station to not only continue to adopt time control, but also use the magnitude of the vacuum degree as a control condition, thereby realizing a pressure regulation function that better meets the on-site process requirements and improving the drying effect and quality of the transformer coil. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the control system of a coil constant-pressure pump station with vacuum degree control according to the present utility model;

[0024] Figure 2 It is a schematic diagram of the hydraulic principle of a coil constant-pressure pump station with vacuum degree control according to the present utility model.

[0025] In the figure: 1 - industrial control computer, 2 - vacuum pressure gauge, 3 - PLC module, 4 - pressure sensor, 4.1 - first pressure sensor, 4.2 - second pressure sensor, 4.3 - third pressure sensor, 4.4 - fourth pressure sensor, 4.5 - fifth pressure sensor, 5 - platen solenoid valve, 5.1 - first platen solenoid valve, 5.2 - second platen solenoid valve, 5.3 - third platen solenoid valve, 5.4 - fourth platen solenoid valve, 6 - system solenoid valve, 7 - system relief valve, 8 - oil tank, 9.1 - first electric pump, 9.2 - second electric pump, 10 - pressure output port, 10.1 - first pressure output port, 10.2 - second pressure output port, 10.3 - third pressure output port, 10.4 - fourth pressure output port. Detailed Embodiments

[0026] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0027] Please refer to Figure 1 and Figure 2, A coil constant-pressure pumping station controlled by vacuum degree disclosed in an embodiment of the present application includes a control system and a hydraulic system; wherein, the control system includes an industrial control computer 1 and a PLC module 3 electrically connected thereto, and can control the hydraulic system to output a predetermined hydraulic pressure during the working process according to the pre-input time or vacuum degree condition; the coil constant-pressure pumping station further includes a vapor-phase drying tank, in which a vacuum pressure gauge 11 is installed, and the vacuum pressure gauge 11 is electrically connected to the PLC module 3 for monitoring the vacuum degree in the vapor-phase drying tank and transmitting the value to the PLC module 3. The PLC module 3 adjusts the hydraulic pressure of the hydraulic system to change the pressing force on the coil, realizing the combination of the vacuum degree and the hydraulic pressing force. The industrial control computer 1 contains commercially available software, enabling the industrial control computer 1 to have data storage and human-machine information interaction functions.

[0028] The hydraulic system mainly includes: four pressure sensors 4, four platen solenoid valves 5, a system solenoid valve 6, a system relief valve 7, an oil tank 8, a first electric pump 9.1, a second electric pump 9.2 and four pressure output ports 10.

[0029] Among them, the pressure output port 10 is correspondingly connected to the coil platen for transmitting the coil pressure. The pressure output port 10 is divided into a first pressure output port 10.1, a second pressure output port 10.2, a third pressure output port 10.3 and a fourth pressure output port 10.4, and each pressure output port is connected to the corresponding coil platen. The number of connected coil platens can be increased or decreased according to actual usage requirements.

[0030] The platen solenoid valves 5 include a first platen solenoid valve 5.1, a second platen solenoid valve 5.2, a third platen solenoid valve 5.3 and a fourth platen solenoid valve 5.4. Each platen solenoid valve corresponds to a pressure output port 10 to control the on-off of the corresponding pressure output port 10, realizing the pressing and pressure maintaining of the corresponding four coils. When the platen solenoid valve is in the on state, the pressure output port 10 discharges oil to drive the platen to press the coil; when the solenoid valve is in the off state, the pressure output port 10 stops discharging oil, and the platen maintains the pressing force on the coil with the current pressure. Each platen solenoid valve corresponds to a pressure output port, which can realize the independent control of the pressing force and the pressing time during the pressing process.

[0031] The pressure sensors 4 include a first pressure sensor 4.1, a second pressure sensor 4.2, a third pressure sensor 4.3 and a fourth pressure sensor 4.4. Each pressure sensor corresponds to a pressure output port, and the four pressure sensors respectively collect the pressure values of the four pressure output ports 10 and feedback them to the PLC module 3 in the control system.

[0032] The system solenoid valve 6 is used to control the first electric pump 9.1 or the second electric pump 9.2 to supply oil to the system. After the first electric pump 9.1 or the second electric pump 9.2 is started, if the system solenoid valve 6 is in the off state, the oil can reach the four platen solenoid valves 5; if the system oil supply solenoid valve 6 is in the on state, the oil returns directly to the fuel tank 8 through it. Among them, the first electric pump 9.1 and the second electric pump 9.2 do not work simultaneously, and the one that does not work serves as a backup, playing a role of double protection. Even if one electric pump breaks down, it will not affect the operation of the entire hydraulic system, thereby improving the operating stability of the pump station.

[0033] The hydraulic system also includes a system relief valve 7, and the system relief valve 7 plays an overload protection role to prevent the system from overpressure, improving the safety performance of the hydraulic system.

[0034] The above are only the preferred embodiments of the present invention, and do not impose any formal or substantial limitations on the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the premise of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. For those skilled in the art, without departing from the spirit and scope of the present invention, any equivalent changes such as slight modifications, decorations, and evolutions made by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the substantial technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A coil constant pressure pump station using vacuum control, comprising a gas phase drying tank, wherein: Also includes, A control system, comprising an industrial computer and a PLC module electrically connected to the industrial computer; The industrial computer is used to control the transformer coil compression force and time; The PLC module is used to realize information interaction, receive parameter data of the transformer coil and transmit the parameters of the transformer coil to the industrial computer, and adjust the pressure applied to the transformer coil and the pressure application time; A hydraulic system, detecting the pressure of the coil and transmitting the pressure to the PLC module; The vacuum pressure gauge is arranged in the gas phase drying tank and is electrically connected to the PLC module to transmit the detected vacuum pressure to the PLC module.

2. A coil constant pressure pump station using vacuum control as claimed in claim 1, wherein: The hydraulic system includes a pressure output port connected to a pressure plate of a transformer coil; the pressure output port is provided with a pressure plate solenoid valve for controlling the on and off of its pressure and a pressure sensor for collecting the pressure value of the pressure output port; the pressure sensor transmits the detected vacuum pressure data to the PLC module.

3. A coil constant pressure pump station using vacuum control as claimed in claim 2, wherein: The hydraulic system also includes a first electric pump which is controlled to be on and off.

4. A coil constant pressure pump station using vacuum control as claimed in claim 3, wherein: The hydraulic system further comprises a second electric pump whose on and off is controlled and which does not work simultaneously with the first electric pump.

5. A coil constant pressure pump station using vacuum control as claimed in claim 2, wherein: When the number of the pressure output ports is greater than two, the pressure output ports are independent of each other; the pressure plate solenoid valve and the pressure sensor arranged at the pressure output ports are also independent of each other.

6. A coil constant pressure pump station using vacuum control as claimed in claim 4, wherein: A system solenoid valve is included, which is used to control the first electric pump or the second electric pump to discharge oil to the system.

7. A coil constant pressure pump station using vacuum control as claimed in claim 2, wherein: A system relief valve is also included to provide overload protection for the hydraulic system.

Images