WO2022016692A1 - Variable-frequency speed regulation all-in-one machine for coal mine - Google Patents

Abstract

Disclosed is a variable-frequency speed regulation all-in-one machine for a coal mine, relating to the technical field of variable-frequency motors. The variable-frequency speed regulation all-in-one machine for a coal mine comprises a housing (2), a motor (1), a frequency converter (3), an input reactor (7), water-cooling heat dissipation structure, an air-cooling heat dissipation structure, a temperature sensor (9), and an industrial personal computer (10). The frequency converter is disposed on the top of the housing, and is separately and electrically connected to the motor and the input reactor disposed inside the housing. The water-cooling heat dissipation structure comprises a fold-back water channel (4), a water tank (5), and a water pump (6) disposed outside the motor. The air-cooling heat dissipation structure is a cooling fan (8) fixedly disposed inside the housing. The temperature sensor is disposed outside the housing. The industrial personal computer is separately connected to the water pump, the cooling fan, the temperature sensor, and the frequency converter, and is used for controlling the operation of the variable-frequency speed regulation all-in-one machine. The variable-frequency speed regulation all-in-one machine for a coal mine has good insulation and heat dissipation performance, and can resist strong magnetic interference, thereby improving the reliability of equipment and prolonging the service life of the equipment.

Description

A kind of variable frequency speed regulation integrated machine for coal mine technical field

The invention relates to the technical field of frequency conversion motors, in particular to a frequency conversion and speed regulation integrated machine for coal mines.

Background technique

In recent years, with the acceleration of the upgrading of coal mine machinery and equipment, in order to meet the requirements of coal mine safety production and coal mine energy saving, and with the rapid development of automation control and power electronic technology, more and more widely used in the coal mining industry. Application of frequency conversion speed control device. At present, the large-scale mine equipment mainly adopts the transmission mode of "high-voltage inverter + motor". The inverter is bulky, the protection level is low, the output cable from the inverter to the motor is long, and there is some interference with other equipment along the line. The long-distance power supply cable distributes inductance and distributed capacitance, when the inverter outputs high-frequency signals, it will affect the insulation life of the motor with high inductance, and the voltage at the motor end will increase significantly. It needs a reinforced insulation structure to adapt to the non-sine wave voltage, and the cable length must be shortened. , in order to reduce the damage to the motor insulation. This method reduces the overall efficiency of the system, increases the maintenance cost of the equipment, occupies the installation space of the equipment, and cannot meet the requirements of coal mines or other mining equipment operating space and harsh environments.

In order to solve this problem, the inverter and the motor can be integrated, and the inverter and the motor can be integrated into one machine, which realizes the integration of mechanics and electricity. The length of the inverter output cable is approximately zero, which minimizes the need for other equipment. The interference of large-scale equipment greatly improves the efficiency of electric transmission of large equipment. Due to the large power loss of the inverter and the motor, after being integrated into the integrated machine, the volume cannot be made too large due to space constraints, so all the heat is accumulated in the airtight container, so the heat cannot be dissipated in time and effectively. The electronic components used in the inverter part of the inverter or the motor bearings, windings, iron cores, etc. cannot work in a high temperature state for a long time. The main problem highlighted is how to solve the heat dissipation of the inverter integrated machine, and its poor insulation and strong electromagnetic interference. It also has a great impact on the working performance, reliability and service life of the all-in-one machine.

technical solutions

In order to solve the technical problems existing in the prior art, the present invention provides a frequency conversion speed regulation integrated machine for coal mines, which has good insulation and heat dissipation performance, can resist strong magnetic interference, and improves the reliability and service life of the equipment.

In order to achieve the above object, the technical scheme of the present invention is:

A variable frequency speed regulation integrated machine for coal mines, comprising a casing, a motor, a frequency converter, an incoming line reactor, a water-cooled heat dissipation structure, an air-cooled heat dissipation structure, a temperature sensor and an industrial computer;

The frequency converter is arranged on the top of the casing, and is respectively electrically connected with the motor and the incoming line reactor arranged inside the casing;

The water-cooled heat dissipation structure includes a folded water channel, a water tank and a water pump arranged outside the motor;

The air-cooled heat dissipation structure is a cooling fan fixed inside the casing;

the temperature sensor is arranged outside the casing;

The industrial computer is respectively connected with a water pump, a cooling fan, a temperature sensor and a frequency converter, and is used to control the work of the frequency conversion and speed regulation integrated machine.

Further, the casing is located on one side of the motor and has a double-layer structure, and the inside of the double-layer structure is provided with the folded water channel, one end of the folded water channel is connected to the water tank, and the other end of the folded water channel is connected to the water pump. , the water tank is connected with the water pump.

Further, the specific arrangement of the turn-back water channel is as follows: a plurality of parallel straight water channel grooves are arranged inside the double-layer structure, and the straight water channel groove is parallel to the axis of the motor, and several straight water channel grooves pass through the curved water channel groove. Connected in turn to form a turn-back water channel.

Further, the cooling fan is arranged on a side away from the motor.

Further, the motor adopts a coil arrangement structure of multiple independent windings. The coils include two independent coil groups that are the same as the two output power sources of the inverter. The two independent coil groups are electrically isolated from each other, and the two independent coils are independent. The coil group cooperates with each other to form a complete rotating magnetic field of the variable frequency motor, so that the integrated variable frequency speed control machine has a good ability to resist strong magnetic interference.

Further, the coil is insulated by strengthening the insulation of the first turn of the motor, wrapping the end of the reinforced coil, soaking and baking, and brushing the end.

beneficial effect

Beneficial effects of the present invention:

1) The present invention makes the all-in-one machine work in the set state by adjusting the motor speed, slowing down the startup, correspondingly prolonging the life of the parts, and at the same time greatly reducing the impact on the equipment, effectively prolonging the maintenance cycle of the equipment, It reduces maintenance costs and saves a lot of maintenance costs; and it is easy to operate, more convenient and convenient, with good safety and reliability, and high work efficiency; it saves labor costs, saves time and effort, reduces work intensity, and meets intelligent requirements;

2) By integrating the frequency converter and the motor, the present invention eliminates the intermediate transmission cable, fundamentally eliminates the interference of the transmission cable, realizes a reasonable matching of performance and size, reduces the size of the equipment, and realizes the Mechatronics and electricity are integrated, and the length of the frequency conversion output cable is approximately zero, which minimizes the interference to other equipment, greatly improves the efficiency of electric transmission of large equipment, subverts the traditional electric transmission mode, and also solves the problem of frequency conversion. Due to the small size of the speed all-in-one machine, the problems of insulation, heat dissipation and strong magnetic interference resistance are generated;

3) The present invention forms a complete rotating magnetic field of the variable frequency motor through the cooperation of two independent coil groups, so that it has a good ability to resist strong magnetic interference; and through the DuPont enamel-coated wire, the insulation of the first turn of the motor is strengthened, and the coil ends are wrapped. , the correct soaking and drying process and the end brushing treatment, etc., to achieve the insulation treatment of the frequency conversion speed control integrated machine;

4) The present invention adopts combined heat dissipation, air-cooled heat dissipation through cooling fans, and water-cooled heat dissipation by the cooperation of folded water channels, water tanks and water pumps, that is, the combination of air-cooled and water-cooled, and the use of temperature sensors to collect current temperature and control it according to actual needs. The open state of both air cooling and water cooling; the industrial computer controls the cooling fan for air cooling and heat dissipation, and controls the water pump and water tank for water cooling and heat dissipation;

5) The present invention protects the circuit while preventing electromagnetic interference to other equipment by installing the incoming line reactor, limits the harmonic interference in the power grid, and maintains electromagnetic stability.

Other features and advantages of the present invention will be described in detail in part in the detailed description below.

Description of drawings

Fig. 1 is the structural representation of a kind of frequency conversion speed regulation integrated machine for coal mine provided by the present invention;

Fig. 2 is an arrangement structure diagram of motor coils and U-phase coils provided by the present invention, wherein Fig. 2(a) is an arrangement structure diagram of motor coils, and Fig. 2(b) is an arrangement structure diagram of U-phase coils;

3 is a diagram of a frequency converter control system provided by the present invention;

Fig. 4 is the temperature signal acquisition and detection flow chart of the temperature sensor provided by the present invention;

FIG. 5 is a flow chart of the heat dissipation working process of a variable frequency speed regulation integrated machine for coal mines provided by the present invention.

Reference numerals in the drawings in the description include:

1-motor, 2-case, 3-frequency converter, 4-turn-back water channel, 5-water tank, 6-water pump, 7-line reactor, 8-cooling fan, 9-temperature sensor, 10-industrial computer.

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "vertical", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a mechanical connection or an electrical connection, or two The internal communication between the elements may be directly connected or indirectly connected through an intermediate medium, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific circumstances.

In order to solve the problems existing in the prior art, as shown in FIG. 1 to FIG. 5 , the present invention provides a frequency conversion and speed regulation integrated machine for coal mines, including a casing 2 , a motor 1 , a frequency converter 3 , an incoming line reactor 7 , and a water cooling system. A heat dissipation structure, an air-cooled heat dissipation structure, a temperature sensor 9 and an industrial computer 10;

The frequency converter 3 is arranged on the top of the casing 2, and is electrically connected to the motor 1 and the incoming line reactor 7 arranged inside the casing 2 respectively;

The water-cooled heat dissipation structure includes a folded water channel 4, a water tank 5 and a water pump 6 arranged outside the motor 1;

The air-cooled heat dissipation structure is a cooling fan 8 fixed inside the casing 2;

The temperature sensor 9 is arranged outside the casing 2;

The industrial computer 10 is respectively connected with the water pump 6, the cooling fan 8, the temperature sensor 9 and the frequency converter 3, and is used for controlling the work of the frequency conversion and speed regulation integrated machine.

As shown in FIG. 1 , the present invention integrates the inverter 3 and the motor 1, the inverter 3 is located on the upper part of the motor 1 nested in the housing 2, and the internal cables are connected, eliminating the need for exposed connection cables. The inverter 3 is reasonably matched, such as the matching of working voltage and frequency, which is convenient for connection and use, realizes reasonable matching in performance and size, reduces the size of the equipment, and improves the reliability, economy and versatility of the equipment. The frequency converter 3 of the present invention is controlled by the industrial computer 10 to control the frequency converter 3 to perform soft start and stepless speed regulation on the motor 1 . In the present invention, by installing the incoming line reactor 7, the incoming line reactor 7 is electrically connected with the frequency converter 3, on the one hand, it can limit the current impact caused by the sudden change of grid voltage or overvoltage, and effectively ensure the normal operation of the frequency converter 3; On the one hand, it can reduce the "pollution" of the power grid caused by the high-order harmonics generated by the rectifying part of the inverter 3 during operation, and effectively prevent electromagnetic interference to other equipment. A temperature sensor 9 is magnetically adsorbed on the outside of the casing 2, and the temperature of the all-in-one machine is monitored by the temperature sensor 9, and the temperature signal is transmitted to the industrial computer 10 in real time. Control the open state of both air cooling and water cooling. A cooling fan 8 is provided on the inner right side of the casing 2, and the industrial computer 10 controls the operation of the cooling fan 8 to realize air cooling and heat dissipation of the all-in-one machine.

The casing 2 is located on the side of the motor 1 and has a double-layer structure. The inside of the double-layer structure is provided with a turn-back water channel 4. One end of the turn-back water channel 4 is connected to the water tank 5, and the other end of the turn-back water channel 4 is connected to the water pump 6. The water pump 6 is connected. The specific arrangement of the turn-back water channel 4 is as follows: a number of parallel straight water channel grooves are arranged inside the double-layer structure, and the straight water channel groove is parallel to the axis of the motor 1, and several straight water channel grooves are connected in turn through the curved water channel groove to form a turn-back type. Waterway 4.

In the present invention, the casing 2 is a cuboid structure with an open top, which is located on one side of the motor 1 is a double-layer shell nesting type structure, and is located on one side of the motor 1 is a cylindrical structure, which is used for embedding the motor 1 into the structure. Among them, the folding water channel 4 is processed in the inner interlayer of the double-layer structure, and the water channels are connected in series by welding and sealing. Realize the connection with the water channel one in and one out, so as to carry out water cooling and heat dissipation for the all-in-one machine, that is, the industrial computer 10 controls the water pump 6 to work, and the water pump 6 extracts the cooling liquid in the water tank 5, and circulates through the folded water channel 4; The water channel 4 can also be set as follows: one end of the two ends of each straight water channel groove is turned and folded back, and there are multiple reciprocating lines, covering the casing 2 of the motor 1 all the time; The water inlet and outlet are designed at the rear end of the motor 1, which saves space and is convenient to connect with the water pipe.

The cooling fan 8 is arranged on the side away from the motor 1 to facilitate cooling of the entire integrated machine.

The motor 1 adopts the coil arrangement structure of multiple independent windings. The coils include two independent coil sets that are the same as the two output power sources of the inverter 3. The two independent coil sets are electrically isolated from each other, and the two independent coil sets cooperate with each other to form The complete rotating magnetic field of the frequency conversion motor makes the frequency conversion and speed control integrated machine have a good ability to resist strong magnetic interference. The coil is insulated by strengthening the insulation of the first turn of the motor 1, wrapping the end of the reinforced coil, soaking and drying, and brushing the end.

As shown in Figure 2, the present invention has good anti-strong magnetic interference performance. Figure 2 (a) shows the arrangement structure of the coils of the motor 1. The independent coil groups of each circuit are electrically isolated from each other, and the two independent coil groups cooperate with each other to form a complete rotating magnetic field of the variable frequency motor. Each independent coil group includes three-phase branch coils, namely U-phase, W-phase and V-phase in the figure. Each phase branch coil is composed of four coils placed side by side in parallel. The coil span is 1-16, and the coils are evenly arranged. The above two independent coil groups are connected in parallel together as a complete excitation source for a motor, corresponding to two independent power sources respectively. , is two-way power input; Figure 2(b) is the corresponding relationship between U01 and U11, the solid line part of the coil is U11, the dotted part of the coil is U01, and the corresponding relationship of the remaining phases is the same as the U phase. Among them, the stator coil corresponding to each power supply occupies a part of the original traditional coil arrangement, which is equivalent to cutting the original traditional coil in series, reducing the magnetic interference as much as possible, and has good anti-strong magnetic interference ability. The present invention selects a plurality of windings, and can use a reasonable winding method in the prior art to reduce the magnetic interference as much as possible, and has a good ability to resist strong magnetic interference.

The invention has good insulation performance, because the factors such as overvoltage, pulse voltage, pulse frequency, pulse rise rate and resonance generated by the variable frequency power supply act on the winding of the motor 1, resulting in high electric field strength, partial discharge, medium heating, space charge induction, electromagnetic Excitation, etc., will cause early damage to the insulation of the motor 1, so it should be insulated and anti-strong magnetic interference treatment in terms of materials and processes. In terms of insulation treatment, use DuPont enamel-coated wire for the variable frequency magnet wire to improve its corona resistance; strengthen the insulation of the first turn of the motor, and add a composite foil in the first turn to separate it from other turns to prevent it from being caused by The uneven stress caused by the pulse voltage causes insulation damage; when selecting insulating materials, materials that are easily penetrated should be selected, and the ends of the coils should be bound and fixed to ensure that the ends become a whole, improve its overall mechanical strength, and reduce electromagnetic waves. Influence of excitation force and mechanical vibration; choose appropriate impregnating paint and correct impregnating paint drying process to form air-gap insulation and prevent the existence of air gaps in the insulation structure of variable frequency motor 1. Under the action of high-frequency pulse voltage, the air gap The space charge is generated, resulting in an increase in the number of partial discharges, which eventually leads to insulation damage; the winding outlet slot can be fixed to eliminate the inter-turn caused by partial discharge caused by the electrical stress of the slot; in addition, the winding end can be brushed to dry itself. It is glued and fixed and strengthened to reduce the force and deformation of the winding caused by electromagnetic excitation, prevent damage to the insulation, realize the insulation treatment of the frequency conversion speed control integrated machine, and strengthen the insulation strength.

The working process of a frequency conversion speed regulation integrated machine for coal mines of the present invention is as follows:

As shown in Figure 3, the console of the industrial computer 10 is controlled by the control unit of the inverter 3, the circuit breaker is protected, and the power-on work is started; the voltage is stabilized through the incoming line reactor 7, the main contactor is turned on, and the rectifier circuit is passed through. , capacitors, and inverter circuits reduce power loss while performing alternating conversion; finally, the AC power is released through the inverter circuit to perform soft-start protection and stepless speed regulation for the variable frequency motor 1. By adjusting the speed of the motor 1, the integrated machine is set working in the state, then the control unit of the frequency converter 3 will feed back the working state to the display of the industrial computer 10;

As shown in FIG. 4 , when the frequency conversion and speed regulation integrated machine for coal mine works, the temperature sensor 9 detects its temperature, and transmits the temperature signal to the industrial computer 10. The industrial computer 10 transmits the signal to the filter through the receiving module for processing. , the analog signal is coded and modulated by the modulator, and then the analog signal is converted into a digital signal through A/D conversion. After the digital signal is decoded and demodulated by the demodulator, the data is transmitted to the control system of the industrial computer 10;

As shown in Figure 5, define temperature X, temperature Y and temperature Z, according to the temperature fed back by the temperature sensor 9, when the temperature is lower than the temperature X, only the cooling fan 8 is turned on to perform air-cooling and heat dissipation work on the all-in-one machine; When the temperature is between X and Y, only the water pump 6 is turned on, and the coolant is circulated through the water tank 5 and the turn-back water channel 4, and the all-in-one machine is water-cooled and dissipated; The heat dissipation is turned on at the same time to ensure that the heat dissipation effect can meet the working requirements of the all-in-one machine; when the temperature exceeds Z, the frequency conversion and speed regulation all-in-one machine stops working and cools down to prevent safety hazards caused by excessive temperature.

The invention has insulation, heat dissipation and strong magnetic interference resistance, which makes the work more accurate and reliable, is beneficial to the underground work, meets the requirements of intelligence, and is worthy of popularization and application.

In addition, each component of the present invention is precisely connected and has a simple structure, which ensures the accuracy of each component in the installation process and operation, and minimizes errors. All components in the present invention are made of insulating materials as far as possible and are treated with insulation to strengthen their insulation strength, so that the frequency conversion and speed regulation integrated machine has good insulation and is safe and reliable.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (6)

1. An all-in-one variable frequency speed regulation machine for coal mines, which is characterized by comprising a casing, a motor, a frequency converter, an incoming line reactor, a water-cooled heat dissipation structure, an air-cooled heat dissipation structure, a temperature sensor and an industrial computer;

   The frequency converter is arranged on the top of the casing, and is respectively electrically connected with the motor and the incoming line reactor arranged inside the casing;

   The water-cooled heat dissipation structure includes a folded water channel, a water tank and a water pump arranged outside the motor;

   The air-cooled heat dissipation structure is a cooling fan fixed inside the casing;

   the temperature sensor is arranged outside the casing;

   The industrial computer is respectively connected with a water pump, a cooling fan, a temperature sensor and a frequency converter.
2. The frequency conversion and speed regulation integrated machine for coal mines according to claim 1, wherein the casing is located on one side of the motor and has a double-layered structure, and the double-layered structure is provided with the folded water channel. One end is connected with the water tank, the other end of the folded water channel is connected with the water pump, and the water tank is connected with the water pump.
3. The variable frequency speed regulation integrated machine for coal mines according to claim 2, wherein the specific arrangement of the turn-back water channel is as follows: a plurality of straight water channel grooves arranged in parallel are arranged inside the double-layer structure, and the straight water channel The groove is parallel to the axis of the motor, and several straight water channel grooves are connected in turn through curved water channel grooves to form a turn-back water channel.
4. The frequency conversion and speed regulation integrated machine for coal mines according to any one of claims 1-3, wherein the cooling fan is arranged on a side away from the motor.
5. The variable frequency speed regulation integrated machine for coal mines according to any one of claims 1 to 3, wherein the motor is arranged through a coil arrangement structure of multiple independent windings, and the coils include the same two output power sources as the frequency converter. The two independent coil groups are electrically isolated from each other.
6. The all-in-one variable frequency speed regulation machine for coal mines according to claim 5, wherein the coil is insulated by strengthening the insulation of the first turn of the motor, wrapping the coil ends, soaking and drying, and brushing the ends. .