Automatic control energy-saving device of chamber type filter press

Abstract

The utility model discloses an automatic control energy-saving device of a chamber type filter press, which belongs to the technical field of energy-saving devices and comprises a main circuit, a current feedback circuit and a peripheral auxiliary control circuit, the main circuit is connected with a power supply through a fuse, and an input end of the current feedback circuit is connected with an output end of a main loop of a frequency converter in the main circuit. The output end of the current feedback circuit is connected with the feedback current input end of a frequency converter in the main circuit, the input end of the peripheral auxiliary control circuit is connected with the current feedback value output end of the frequency converter in the main circuit, and the output end of the peripheral auxiliary control circuit is connected with the auxiliary signal PI D input end of the frequency converter in the main circuit. The device has the beneficial effects that the problems of long-term manual operation, complicated operation process, overlong operation time, high equipment failure rate, short service life of the motor and the like are solved. According to the improved control system, electric energy is greatly saved, cost is reduced, working efficiency is improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy-saving devices, and in particular relates to an automatic control energy-saving device for a chamber filter press. Background Art

[0002] The chamber filter press is one of the main equipment commonly used in the filtration workshop. Since the electrical control system of the chamber filter press adopts the traditional relay-contactor control, its operation mode adopts manual operation control. When the equipment is working, the operator must manually operate the start and stop of the filter press, and manually control the switching of the filter press's working modes such as filtration and drying. This manual operation will increase a lot of labor intensity, especially in each working mode of the filter press, its plunger pump motor always maintains a high-speed operation state. The higher the speed, the greater the power consumption, which will cause a great loss of electric energy, and will also damage the motor and shorten the motor life. Utility Model Content

[0003] The technical problem to be solved by the utility model is to address the problem raised in the background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] An automatic control energy-saving device for a chamber filter press comprises a main circuit 1, a current feedback circuit 2 and a peripheral auxiliary control circuit 3, wherein the main circuit 1 is connected to a power supply via a fuse 4, the input end of the current feedback circuit 2 is connected to the output end of a main circuit of a frequency converter 6 in the main circuit 1, the output end of the current feedback circuit 2 is connected to a feedback current input end of the frequency converter 6 in the main circuit 1, the input end of the peripheral auxiliary control circuit 3 is connected to the current feedback value output end of the frequency converter 6 in the main circuit 1, and the output end of the peripheral auxiliary control circuit 3 is connected to the auxiliary signal PID input end of the frequency converter 6 in the main circuit 1.

[0006] The fuse 4 is connected to the input end of the main circuit breaker 5, and the output end of the main circuit breaker 5 is divided into three paths;

[0007] The first path is connected to the input end of the frequency converter 6, the output end of the frequency converter 6 is connected to the input end of the AC contactor a9, the output end of the AC contactor a9 is connected to the input end of the thermal relay Ⅰ12, and the output end of the thermal relay Ⅰ12 is connected to the plunger pump motor 14 of the filter press;

[0008] The second circuit is connected to the plunger pump motor 14 of the filter press through the circuit breaker 7 and the main contact of the AC contactor b10;

[0009] The third path is connected to the cooling fan 15 through the circuit breaker 8, the main contact of the AC contactor c11 and the thermal relay II13.

[0010] The power supply is a 380V three-phase AC power supply.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The frequency converter can completely realize the automatic control and energy-saving transformation of the chamber filter press in the filtration workshop. At the same time, it also solves the problems of long-term manual operation and complicated operation process, long operation time, high equipment failure rate and shortened motor service life. The modified control system greatly saves electricity, reduces costs, improves work efficiency and extends the service life of the motor. After the device is used, the statistical results show that the comprehensive power saving rate can reach more than 50%, and the control system is simple and easy to operate, convenient and fast, which greatly reduces the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an electrical schematic diagram of an embodiment of the utility model.

[0014] Figure 2 It is a control circuit diagram of an embodiment of the utility model.

[0015] Attached Figure 1 Serial number and name: 1-main circuit, 2-current feedback circuit, 3-peripheral auxiliary control circuit, 4-fuse, 5-main circuit breaker, 6-frequency converter, 7-sub-circuit breaker, 8-sub-circuit breaker, 9-AC contactor a, 10-AC contactor b, 11-AC contactor c, 12-thermal relay, 13-thermal relay, 14-piston pump motor, 15-cooling fan, 16-PID signal, 17-current signal, 18-AC contactor normally open contact. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0017] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0018] Example 1

[0019] like Figure 1-2As shown, the utility model describes an automatic control energy-saving device for a chamber filter press, comprising a main circuit 1, a current feedback circuit 2 and a peripheral auxiliary control circuit 3, wherein the main circuit 1 is connected to a power supply via a fuse 4, the input end of the current feedback circuit 2 is connected to the output end of the main circuit of the inverter 6 in the main circuit 1, the output end of the current feedback circuit 2 is connected to the feedback current input end of the inverter 6 in the main circuit 1, the input end of the peripheral auxiliary control circuit 3 is connected to the current feedback value output end of the inverter 6 in the main circuit 1, and the output end of the peripheral auxiliary control circuit 3 is connected to the auxiliary signal PID input end of the inverter 6 in the main circuit 1.

[0020] The fuse 4 is connected to the input end of the main circuit breaker 5, and the output end of the main circuit breaker 5 is divided into three paths;

[0021] The first path is connected to the input end of the frequency converter 6, the output end of the frequency converter 6 is connected to the input end of the AC contactor a9, the output end of the AC contactor a9 is connected to the input end of the thermal relay Ⅰ12, and the output end of the thermal relay Ⅰ12 is connected to the plunger pump motor 14 of the filter press;

[0022] The second circuit is connected to the plunger pump motor 14 of the filter press through the circuit breaker 7 and the main contact of the AC contactor b10;

[0023] The third path is connected to the cooling fan 15 through the circuit breaker 8, the main contact of the AC contactor c11 and the thermal relay II13.

[0024] The power supply is a 380V three-phase AC power supply.

[0025] The electrical components required for the main circuit include: 1 frequency converter, 3 fuses, 1 main circuit breaker, 2 branch circuit breakers, 3 AC contactors, 2 thermal relays, 1 plunger pump motor, 1 cooling fan, and several control wires.

[0026] The electrical components required for the control circuit specifically include: 7 buttons, 5 indicator lights, 3 groups of contactor auxiliary normally closed contacts, 6 groups of contactor auxiliary normally open contacts, 2 groups of frequency conversion relay normally open contacts, 1 group of temperature relay normally open contacts, several control wires, etc.

[0027] The current feedback circuit sends the current at the output end of the main circuit back to the input end of the inverter through a certain path. The working current of the plunger pump motor is fed back to the inverter through the current feedback circuit, and then converted by the inverter into a current feedback value and sent to the peripheral auxiliary control circuit.

[0028] The peripheral auxiliary control circuit is used to convert the current feedback value into the PID value for controlling the operating frequency of the frequency converter. The circuit is preset with the pressure values ​​of each working mode of the filter press, and is preset with an automatic conversion module for the current feedback value and the pressure value.

[0029] Through the design of the above technical scheme, the core of its main technical transformation is to use the frequency converter, the core component of the device. When the working current of the motor of the compartment press plunger pump in each working mode is fed back to the frequency converter in real time through the current feedback circuit, the frequency converter converts it into a current feedback value and transmits it to the peripheral auxiliary control circuit. The automatic conversion module built into the peripheral auxiliary control circuit then converts this current feedback value into a PID value for controlling the operating frequency of the frequency converter, thereby controlling the operating frequency of the frequency converter and ultimately achieving automatic energy-saving control of the motor.

[0030] In addition, the device is also equipped with a temperature sensor to detect the temperature of the plunger pump motor. The temperature sensor is installed on the surface of the plunger pump motor, and the normally open contact of the temperature relay on the sensor is connected to the cooling fan. In particular, after the temperature sensor is installed in the device, the temperature of the plunger pump motor can be detected at any time. When the temperature of the plunger pump motor changes, the temperature relay is energized, its normally open contact is turned on, and the cooling fan runs. That is, the cooling fan is kept in a working state and can cool the plunger pump motor at any time to prevent the high temperature from not falling when the plunger pump motor stops, thereby shortening the service life of the plunger pump motor.

[0031] like Figure 2 As shown, this circuit is the control circuit of the device, that is, the main circuit operation of the device is directly controlled by the instructions issued by the electrical components of the control circuit. The control circuit directly controls the operation of the plunger pump motor, the cooling motor, the inverter fault indication, the switching of the power frequency circuit and the variable frequency circuit.

[0032] The working principle of the designed energy-saving device in each working mode is described as follows:

[0033] The first part is the chamber filter press setup and startup phase, which is described in detail as follows:

[0034] Set the function selection switch of the device to manual mode, manually set the operating frequency of the frequency converter 6 to the maximum (maximum frequency: 50Hz), then press the start button 4, the AC contactor a9 is energized and forms an interlock, the frequency converter 6 starts and starts to run, the operating frequency rises from 0 to 50Hz, the operating current of the plunger pump motor 14 rises from 0 to the rated current, and soft start is achieved. When the operating frequency of the frequency converter 6 reaches the full frequency of 50Hz, adjust the overflow valve and load, and then set different working pressures according to different process requirements. After the working pressure is set, press the stop button 2, then adjust the function selection switch to automatic mode, and press the start button 4 again to start the energy-saving device. When the current feedback value output by the frequency converter 6 reaches the pressure value preset in the peripheral auxiliary control circuit 3, the system enters the pressure holding state.

[0035] The second part is the filtration and pressure maintenance stage of the chamber filter press, which is described in detail as follows:

[0036] When the current feedback value output by the inverter 6 is equal to the pressure value preset in the peripheral auxiliary control circuit 3, the peripheral auxiliary control circuit 3 outputs the corresponding PID signal to the inverter 6, and the inverter 6 will automatically adjust the operating frequency to the operating frequency closest to the pressure value, so as to realize the current negative feedback automatic control. When the load becomes larger, the operating frequency of the inverter automatically decreases, and when the load becomes smaller, the operating frequency of the inverter automatically increases.

[0037] The third part is the chamber filter press drying and automatic operation adjustment stage, which is described in detail as follows:

[0038] When the plunger pump is working all the time, the water in the filter press will be continuously squeezed out and filtered. As the water content of the mud in the filter press decreases, the load of the plunger pump motor 14 increases accordingly. Through automatic current negative feedback control, while ensuring the preset pressure value, the operating frequency of the plunger pump motor 14 is automatically adjusted and decreased, the speed is getting lower and lower, and the power consumption is getting lower and lower, achieving the expected automatic energy-saving effect. The test results show that the power saving rate of the drying operation can reach more than 70%, which can achieve the purpose of energy saving and consumption reduction without affecting work efficiency.

[0039] In addition, the device is also equipped with a temperature sensor for detecting the temperature of the plunger pump motor 14, which is the core component of the temperature relay. When the normally open contact 14 of the AC contactor B10 is connected in parallel with the normally open contact 15 of the AC contactor A9 and then connected in series to the coil circuit of the AC contactor C11, as long as one of the normally open contacts of the AC contactor B10 and the AC contactor A9 is turned on, the AC contactor C11 will remain in the attracted state, that is, no matter whether the plunger pump motor 14 is running at the industrial frequency or the variable frequency, the cooling fan 15 is in the energized working state. If the plunger pump motor 14 stops at this time, that is, the AC contactor A9 and the AC contactor B10 are both de-energized and released, but the normally open contact 16 of the temperature relay is connected in parallel with the auxiliary normally open contact 17 of the AC contactor C11 and then connected in series to the circuit of the cooling fan 15, so that as long as the temperature relay is turned on with one of the auxiliary normally open contacts of the AC contactor C11, the cooling fan 15 can remain in the working state. If AC contactor a9, AC contactor b10, and AC contactor c11 are all de-energized and released, the cooling fan 15 is connected by the normally open contact 16 of the temperature relay. When the temperature changes, the temperature relay coil is energized and the normally open contact 16 is turned on, that is, the cooling fan 15 continues to work and cools the plunger pump motor 14 to prevent the motor temperature from being too high when the plunger pump motor stops, which is difficult to reduce in a short time, thereby shortening the service life of the motor.

[0040] In summary, during the operation of the device, the working current of the plunger pump motor 14 in each working mode is fed back to the inverter 6 in real time through the current feedback circuit 2, and then converted by the inverter 6 into a current feedback value and transmitted to the peripheral auxiliary control circuit 3, and the automatic conversion module built into the peripheral auxiliary control circuit 3 converts this current feedback value into a PID value for controlling the operating frequency of the inverter 6, thereby controlling the operating frequency of the inverter 6 and realizing automatic energy-saving control. Finally, when the inverter 6 fails or other emergency situations occur, the power frequency circuit start button 24 is pressed at any time, the AC contactor b10 is energized and attracted, and the plunger pump motor 14 enters the power frequency operation state, thereby realizing the switching of the power frequency operation and the variable frequency operation circuit, so that the equipment can be continuously operated without stopping in the middle, and the inverter and motor are not easily damaged.

[0041] Through the operation effect of the above-designed technical scheme after the transformation, it can be known that the frequency converter can completely realize the automatic control energy-saving transformation of the chamber filter press in the filtration workshop, and at the same time solve the problems of long-term manual operation and complicated operation process, long operation time, high equipment failure rate and shortened motor service life. The modified control system greatly saves electricity, reduces costs, improves work efficiency and extends the service life of the motor. After the device is used, the statistical results show that the comprehensive power saving rate can reach more than 50%, and the control system is simple and easy to operate, convenient and fast, which greatly reduces the labor intensity of the operator.

[0042] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the embodiments above is only applicable to help understand the principles of the embodiments of the present invention.

Claims

1. An automatic control energy-saving device for a chamber filter press, comprising a main circuit (1), a current feedback circuit (2) and a peripheral auxiliary control circuit (3), characterized in that: The main circuit (1) is connected to a power supply via a fuse (4); the input end of the current feedback circuit (2) is connected to the output end of the main circuit of the frequency converter (6) in the main circuit (1); the output end of the current feedback circuit (2) is connected to the feedback current input end of the frequency converter (6) in the main circuit (1); the input end of the peripheral auxiliary control circuit (3) is connected to the current feedback value output end of the frequency converter (6) in the main circuit (1); and the output end of the peripheral auxiliary control circuit (3) is connected to the auxiliary signal PID input end of the frequency converter (6) in the main circuit (1).

2. The automatic control energy-saving device for chamber filter press according to claim 1, characterized in that: The fuse (4) is connected to the input end of the main circuit breaker (5), and the output end of the main circuit breaker (5) is divided into three paths; The first path is connected to the input end of the frequency converter (6), the output end of the frequency converter (6) is connected to the input end of the AC contactor a (9), the output end of the AC contactor a (9) is connected to the input end of the thermal relay I (12), and the output end of the thermal relay I (12) is connected to the plunger pump motor (14) of the filter press; The second circuit is connected to the plunger pump motor (14) of the filter press through the circuit breaker (7) and the main contact of the AC contactor b (10); The third circuit is connected to the cooling fan (15) through the circuit breaker (8), the main contact of the AC contactor C (11) and the thermal relay II (13).

3. The automatic control energy-saving device for chamber filter press according to claim 2, characterized in that: The power supply is a 380V three-phase AC power supply.

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