Reduction inertia energy consumption recycling device for centrifugal dehydrator

Abstract

The utility model relates to the technical field of centrifugal machine energy recovery, and aims to provide a centrifugal dehydrator deceleration inertial energy consumption recycling device, which comprises a front axle loop and a rear axle loop, a capacitor filter circuit is connected in parallel between the front axle loop and the rear axle loop, the front axle loop is connected with an input alternating current power supply, and the rear axle loop is connected with an output alternating current power supply. And the rear axle loop is connected with a motor of the centrifugal dehydrator. According to the utility model, the full-control characteristic of the IGBT component is utilized, that is, the component can work in a rectification state and an inversion state, when the centrifugal machine is started to operate in an accelerated manner, the front axle works in the rectification state, the rear axle works in the inversion state, the power grid inputs energy to the motor, electric energy is converted into mechanical energy, and normal rotation of the motor is kept. When the centrifugal machine is decelerated and shut down, the rear axle works in a rectification state, the front axle works in an inversion state, the motor feeds electric energy back to a power grid, mechanical energy is converted into electric energy, energy recycling is achieved, and the centrifugal machine is shut down rapidly.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuge energy recovery, in particular to a device for recovering and reusing the deceleration inertia energy consumption of a centrifugal dehydrator. Background Art

[0002] When the dehydrator brakes, resistance braking is preferred, and the braking energy generated is huge. Due to grid voltage limitations and other reasons, a large amount of regenerative electricity cannot be fed back to the grid, but is released as heat energy through the braking resistor, resulting in energy waste and high-temperature pollution, and increasing safety risks in the related circuits of the braking system.

[0003] Centrifuge and frequency converter, brake resistor, etc. Figure 4 As shown in the figure, the original system used a frequency converter (37Kw) + a braking resistor (9Kw). When the machine stopped, the braking resistor absorbed excess energy, converted mechanical energy into heat energy, consumed braking energy, and achieved the purpose of stopping. The braking resistor heated up, resulting in a large amount of energy waste.

[0004] The reasons why the existing inverter + brake resistor design is unreasonable are as follows: 1. The centrifuge load has a relatively high starting torque requirement, making it difficult to start; 2. The centrifuge has a large moment of inertia, and the acceleration / deceleration time is long, which generates regenerative energy during deceleration; 3. The centrifuge load requires rapid acceleration / deceleration; 4. The load is suddenly added during operation; 5. Starting with load is required; 6. The brake resistor heats up severely, resulting in a huge waste of energy; 7. The parking brake time is too long, about 150 seconds, which is not conducive to improving production efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a device for recovering and reusing the deceleration inertia energy consumption of a centrifugal dehydrator, so as to solve the problems raised in the above background technology.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A centrifugal dehydrator deceleration inertia energy consumption recovery and reuse device includes a front axle circuit and a rear axle circuit, wherein a capacitor filter circuit is connected in parallel between the front axle circuit and the rear axle circuit, the front axle circuit is connected to an input AC power supply, and the rear axle circuit is connected to a motor of the centrifugal dehydrator.

[0008] An inductor filter circuit is connected in series between the input AC power supply and the front axle loop.

[0009] The front bridge circuit includes two groups, each group is composed of three IGBTs, and the three IGBTs are star-connected to the capacitor filter circuit.

[0010] The rear bridge circuit includes two groups, each group is composed of three IGBTs, and the three IGBTs are star-connected to the capacitor filter circuit.

[0011] The capacitor filter circuit is composed of two capacitors connected in series.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0013] 1) The utility model converts mechanical energy into electrical energy by utilizing the huge inertia of the centrifuge when it slows down and stops, realizing energy recovery and utilization, thereby greatly reducing the energy consumption level of the equipment;

[0014] 2) The utility model greatly reduces the downtime of the centrifuge from the original 150s to 30s, which helps to improve production efficiency;

[0015] 3) The utility model adopts IGBT module as the rectifier device and uses high-speed, high-computing power DSP to generate PWM control pulses, which can improve the power factor, recycle energy consumption, and eliminate harmonic pollution to the power grid;

[0016] 4) The present invention contains nonlinear loads such as inductors and capacitors. The nonlinear working characteristics of inductors and capacitors can be utilized, and the high computing power of the DSP chip can be used to quickly adjust the output voltage. When the power grid flashes or sags (drops to 85% of the rated voltage), the device can still maintain a stable output voltage, ensuring the safe and reliable operation of the centrifuge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall principle diagram of an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the working state of the front axle in the electric state in an embodiment of the utility model.

[0019] Figure 3 This is a schematic diagram of the working state of the rear axle in the electric state in an embodiment of the utility model.

[0020] Figure 4 This is the electrical schematic diagram of the frequency converter + brake resistor in the prior art. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] like Figure 1-3 As shown, the utility model describes a centrifugal dehydrator deceleration inertia energy consumption recovery and reuse device, including a front axle circuit and a rear axle circuit, a capacitor filter circuit is connected in parallel between the front axle circuit and the rear axle circuit, the front axle circuit is connected to the input AC power supply, the input AC power supply and the front axle circuit adopt a three-phase three-wire connection method, an inductor filter circuit is connected in series between the input AC power supply and the front axle circuit, the inductor filter circuit adopts an inductor coil, and there are three inductors; the front axle circuit includes two groups, each group consists of three IGBTs, and the three IGBTs are star-connected to the capacitor filter circuit; the rear axle circuit is connected to the motor of the centrifugal dehydrator, the rear axle circuit includes two groups, each group consists of three IGBTs, and the three IGBTs are star-connected to the capacitor filter circuit; the capacitor filter circuit consists of two capacitors connected in series.

[0024] This utility model utilizes the fully controlled characteristics of IGBT components, which can operate in both rectification and inversion states. When the centrifuge starts and accelerates, the front axle operates in rectification and the rear axle operates in inversion. The power grid inputs energy to the motor, converting electrical energy into mechanical energy to maintain normal motor rotation. When the centrifuge slows down and stops, the rear axle operates in rectification and the front axle operates in inversion. The motor feeds electrical energy back to the grid, converting mechanical energy into electrical energy, achieving energy recovery and rapid centrifuge shutdown.

[0025] Positive effects of this utility model:

[0026] 1) Reduce grid-side harmonic currents, bringing the power factor close to unity. Conventional inverters, due to their diode rectification, generate significant harmonic components, which can seriously pollute the grid, interfere with the normal operation of other equipment, and even cause damage. This device uses an IGBT module as a rectifier and a high-speed, high-performance DSP to generate PWM control pulses, improving the power factor, recycling energy, and eliminating harmonic pollution to the grid.

[0027] 2) Based on the braking energy feedback calculation of a dehydrator in our factory, the amount of braking energy that can be absorbed under different rated powers can be calculated. The specific calculation formula for the amount of braking energy that can be absorbed E is:

[0028]

[0029] Based on the experience of similar equipment, centrifuges have high inertia loads. Without any braking measures, the centrifuge's free stop time is 1 to 2 hours. Our factory uses a conventional inverter + braking resistor, and the deceleration stop time is about 150 seconds. During this time, the braking resistor heats up, resulting in energy waste. After adopting this device, the deceleration stop time is only 30 to 60 seconds, which can greatly improve production efficiency.

[0030] Calculation method: Each time the centrifuge stops, the electrical energy fed back to the grid is approximately: 7.5*0.25=1.875Kwh.

[0031] At present, a single centrifuge in our factory runs 24 hours a day and stops every 30 minutes, so 1.875*48=90Kwh of electricity is saved every day. Based on 300 days of effective operation time throughout the year, 27,000Kwh of electricity can be saved throughout the year.

Claims

1. A centrifugal dehydrator deceleration inertia energy consumption recovery and reuse device, characterized by: It includes a front axle circuit and a rear axle circuit, a capacitor filter circuit is connected in parallel between the front axle circuit and the rear axle circuit, the front axle circuit is connected to the input AC power supply, and the rear axle circuit is connected to the motor of the centrifugal dehydrator; the front axle circuit includes two groups, each group consists of three IGBTs, and the three IGBTs are star-connected to the capacitor filter circuit; the rear axle circuit includes two groups, each group consists of three IGBTs, and the three IGBTs are star-connected to the capacitor filter circuit.

2. The centrifugal dehydrator deceleration inertia energy consumption recovery and reuse device according to claim 1, characterized in that: An inductor filter circuit is connected in series between the input AC power supply and the front axle loop.

3. The centrifugal dehydrator deceleration inertia energy consumption recovery and reuse device according to claim 1, characterized in that: The capacitor filter circuit is composed of two capacitors connected in series.

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