CN112242781A

CN112242781A - Frequency conversion all-in-one machine

Info

Publication number: CN112242781A
Application number: CN202011004093.7A
Authority: CN
Inventors: 宋承林; 王大伟; 杨绪峰; 孙即明; 宋清江; 胡平
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-01-19
Also published as: AU2020469502A1; WO2022062104A1; AU2020469502B2

Abstract

The invention discloses a frequency conversion all-in-one machine. This frequency conversion all-in-one includes: a frequency converter for converting the frequency of the input alternating current and outputting the converted alternating current; the motor is used for receiving the alternating current converted and output by the frequency converter so as to drive a rotating shaft of the motor to rotate; and a speed reducer comprising: the input end is connected with a rotating shaft of the motor so as to rotate along with the rotating shaft; an output end rotating at a lower rotational speed than the input end; and a transmission device arranged between the input end and the output end, and used for transmitting the power of the input end to the output end and reducing the rotating speed of the output end relative to the rotating speed of the input end. The frequency conversion all-in-one machine can drive the load without connecting devices such as a through cylinder, a coupler, a hydraulic coupler and the like to the output end through a special assembly mode, and has the advantages of small occupied space, low cost, convenience in installation and maintenance and the like.

Description

Frequency conversion all-in-one machine

Technical Field

The present invention relates generally to the field of electric motor applications. More specifically, the invention relates to a frequency conversion all-in-one machine.

Background

In general, in a process of operating a motor in a narrow place such as a mine, it is necessary to change the rotational speed of the motor depending on the load. On the other hand, since the motor rotates at a high speed during operation, the output torque is low, and it is not suitable for driving a large load. Therefore, in practical applications, it is necessary to connect a speed reducer (or a fluid coupling) to the outside of the motor through a coupling, protect the coupling through a tube, and finally connect the output end of the speed reducer to a load through the coupling. The connection mode is complex, the cost is high, and the operation is inconvenient. In particular, when the work is performed in a narrow work area such as a downhole area, the installation and use of the equipment and the accessories are impossible.

Although the existing all-in-one machine compresses the volume to a certain extent, the use requirements of some narrow spaces cannot be met. In addition, the existing integrated machine does not have a temperature control measure, so that the internal temperature of the motor or the speed reducer rapidly rises along with the long-time rapid operation of the motor or the speed reducer, and the performance of the motor or the speed reducer is directly reduced, so that the motor or the speed reducer cannot stably and reliably operate. In addition, the existing all-in-one machine is single in appearance size, and the appearance of the all-in-one machine cannot be changed along with the change of underground topography, so that the use of the all-in-one machine is influenced. In addition, due to the limitation of an operation field, the existing all-in-one machine cannot conveniently oil-lubricate the bearing of the motor, or can oil-lubricate, but cannot accurately control the oil amount of the oil to be oiled, so that the motor cannot be lubricated sufficiently or the oil amount is too much, and waste is caused.

Disclosure of Invention

In order to solve one or more problems in the prior art, the invention provides a frequency conversion all-in-one machine capable of meeting the operation requirement of a narrow space under a mine. The frequency conversion all-in-one machine converts the frequency of the input three-phase alternating current through the frequency converter so as to change the rotating speed of the motor. And through the conversion of the speed reducer connected with the rotating shaft of the motor, the rotating speed of the output end of the frequency conversion all-in-one machine is further reduced, so that the torque output by the frequency conversion all-in-one machine is increased. In addition, the frequency converter, the motor and the speed reducer are tightly combined together in a special assembly mode, so that the frequency converter all-in-one machine is simple in structure, small in size and stable and reliable in operation.

Specifically, the invention discloses a frequency conversion all-in-one machine, which comprises: a frequency converter for converting the frequency of the input alternating current and outputting the converted alternating current; the motor is used for receiving the alternating current converted and output by the frequency converter so as to drive a rotating shaft of the motor to rotate; and a speed reducer comprising: the input end is connected with the rotating shaft of the motor so as to rotate along with the rotating shaft of the motor; an output end rotating at a lower rotational speed than the input end; and a transmission device arranged between the input end and the output end, and used for transmitting the power of the input end to the output end and reducing the rotating speed of the output end relative to the rotating speed of the input end.

In one embodiment, the rotating shaft of the motor is connected with the input end of the speed reducer through an external spline and an internal spline which are respectively arranged on the rotating shaft and the input end of the speed reducer, and the output end of the speed reducer is provided with the internal spline so as to be connected with a load.

In another embodiment, the frequency converter includes: a reactance box for performing voltage stabilization, interference suppression and transformation processing on the input high-voltage alternating current so as to output a three-phase alternating current; and a frequency conversion box for frequency-converting the alternating current processed and output by the reactance box so as to output the alternating current to the motor. The connecting piece and the wiring terminal are respectively arranged on two sides of the frequency conversion box along the direction perpendicular to the rotating shaft of the motor, so that the reactance box is fixedly connected with one side or the other side of the frequency conversion box through the connecting piece, and the alternating current output by the reactance box is received through the wiring terminal on the side.

In yet another embodiment, the all-in-one frequency converter further comprises a housing, the frequency conversion box is arranged on the outer surface of the housing, and the interior of the housing is divided into a motor cavity and a speed reducer cavity so as to arrange the motor and the speed reducer respectively.

In one embodiment, the housing is a cylindrical structure, and the reducer and the stator portion of the motor are respectively attached to the inner wall of the cylindrical structure.

In another embodiment, the frequency conversion all-in-one machine further comprises an intermediate end cover which divides the shell into a motor cavity and a speed reducer cavity and is fixedly connected with the shell, and the intermediate end cover is connected with one of the bearings of the motor so as to support and fix the motor; the motor and the speed reducer which keep a gap with the middle end cover are respectively arranged on two sides of the middle end cover so as to be thermally isolated.

In yet another embodiment, the all-in-one frequency converter further comprises a heat dissipation system, which comprises water channels respectively arranged on the bottom of the frequency conversion box, the shell and the middle end cover and a plurality of water seats for connecting the water channels, wherein the water channels and the water seats are mutually matched so as to form a water flow path for dissipating heat of the all-in-one frequency converter.

In another embodiment, the frequency conversion box is respectively provided with a frequency conversion water channel water inlet and a frequency conversion water channel water outlet along two sides in the direction perpendicular to the rotating shaft of the motor. And a plurality of water seats are respectively arranged on the shell on the same side with the water inlet and the water outlet of the variable-frequency water channel. The water outlet of the variable frequency water channel on one side of the variable frequency box is connected with the water seat on one side of the motor cavity through a first water pipe, and the water seat on the other side of the motor cavity is connected with the water seat on the other side of the speed reducer cavity through a second water pipe, so that the water channel forms a first water flow passage. Or the two ends of the first water pipe are respectively connected with the variable frequency water channel water outlet on the other side of the variable frequency box and the water seat on the other side of the motor cavity. And simultaneously, two ends of the second water pipe are respectively connected with the water seat on one side of the motor cavity and the water seat on one side of the speed reducer cavity, so that the water channel forms a second water flow passage.

In one embodiment, the convertible frequency all-in-one machine further comprises an oil filling hole arranged on the shell, so that lubricating oil can be filled into the bearing of the motor through the oil filling hole.

In another embodiment, the motor is equipped with an oil control device at the bearing, which comprises an oil injection pan, a windage pan, an oil slinger and an oil storage box arranged at the lower part of the bearing, so that in operation, the amount of lubricating oil injected into the bearing is controlled.

The frequency conversion all-in-one machine is flexible in application and convenient to install and operate. On the other hand, the reactor box can be quickly disassembled and installed on the other side of the frequency conversion box according to different working environments in a narrow space. On the other hand, through a plurality of water channels and water seats arranged on the frequency conversion all-in-one machine, the water channels can be converted by utilizing different connection modes of the water pipes and the water seats when the frequency conversion all-in-one machine is cooled. In addition, the frequency conversion all-in-one machine has the advantages of explosion resistance, low cost, energy conservation, large output torque and the like.

Drawings

The above-described features of the present invention will be better understood and its numerous objects, features, and advantages will be apparent to those skilled in the art by reading the following detailed description with reference to the accompanying drawings. The drawings in the following description are only some embodiments of the invention and other drawings may be derived by those skilled in the art without inventive effort, wherein:

FIG. 1 is a schematic diagram showing the components of a frequency conversion all-in-one machine according to an embodiment of the invention;

FIG. 2 is a front view showing a variable frequency all-in-one machine according to an embodiment of the invention;

FIG. 3 is a side view showing a variable frequency kiosk according to an embodiment of the invention;

FIG. 4 is a cross-sectional view showing a variable frequency all-in-one machine according to an embodiment of the invention;

FIG. 5 is a block diagram illustrating a portion of the water path of the variable frequency all-in-one machine according to an embodiment of the invention; and

fig. 6 is a partially enlarged structural view illustrating an oil control apparatus of a variable frequency all-in-one machine according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic diagram showing the components of a variable frequency all-in-one machine 100 according to an embodiment of the present invention. In order to better understand the function and principle of the variable frequency all-in-one machine of the invention, the load and the alternating current input are also drawn in fig. 1. The alternating current can be, for example, 3 kv three-phase high-voltage alternating current, and is used for supplying power to the frequency conversion integrated machine. And the load receives the power output by the frequency conversion all-in-one machine so as to carry out operation.

As shown in fig. 1, the variable frequency all-in-one machine 100 of the present invention may include: frequency converter 110, motor 120, and speed reducer 130. The frequency converter can be used for converting the frequency of input alternating current and outputting the converted alternating current. The motor can be used for receiving the alternating current output by the frequency converter so as to drive a rotating shaft of the motor to rotate. The speed reducer may include: an input 131, an output 132, and an actuator 133. Wherein the input end is connected with a rotating shaft of the motor so as to rotate along with the rotating shaft. The output end rotates at a lower speed than the input end. The transmission is disposed between the input and output ends. The rotating speed of the output end is reduced relative to that of the input end. Preferably, the rotation shaft of the motor, the input end and the output end of the reduction gear may be disposed to be located on the same axis, so as to more efficiently perform the transmission of the power.

According to the requirements of application scenes, the variable-frequency all-in-one machine can be realized as a mining explosion-proof direct-drive variable-frequency speed regulation all-in-one machine. In this case, the variable frequency all-in-one machine may be a direct drive (e.g., a permanent magnet direct drive all-in-one machine or an asynchronous direct drive all-in-one machine). The torque obtained by the frequency conversion all-in-one machine is relatively large, and energy is further saved. In addition, because the inside design has the speed reducer structure, can be in the inside of frequency conversion all-in-one with the rotational speed of speed regulation to needs to can directly export on the load equipment. Because no other connecting structures (such as a speed reducer, a through cylinder, a coupling and the like) are arranged between the direct-drive variable-frequency speed-regulating all-in-one machine and the load equipment, the power and the torque of the variable-frequency all-in-one machine can be directly transmitted to the load equipment. Therefore, compared with the existing all-in-one machine, the direct-drive variable-frequency speed regulation all-in-one machine has the advantages of small volume, no connection structure, small occupied space and easy operation.

The working principle of the frequency conversion all-in-one machine of the invention is briefly described below.

Firstly, the frequency conversion all-in-one machine receives external input alternating current, and then carries out voltage stabilization, anti-interference and other processing on the alternating current through the reactance box. The inverter then rectifies, filters, inverts, and the like the ac power processed by the reactor box, and outputs the ac power with a variable frequency to the motor. Under the drive of the alternating current output from the inverter, the rotating shaft of the motor starts to rotate, and the rotating speed of the rotating shaft changes as the frequency of the alternating current changes. Because the input end of the speed reducer is connected with the rotating shaft of the motor, for example, the input end of the speed reducer can be connected through a spline structure, at the moment, the input end of the speed reducer synchronously rotates along with the rotating shaft of the motor.

Further, the rotation of the input end of the speed reducer can drive the transmission device to operate, and further drive the rotation of the output end of the speed reducer. Because the transmission device has a special structure, for example, the transmission device can be composed of a plurality of sun wheels and planet wheels, after the transmission device is converted, the rotating speed of the output end of the speed reducer is obviously lower than that of the input end of the speed reducer, and the torque of the output end of the speed reducer is increased. At this time, the output end of the speed reducer is the output end of the frequency conversion all-in-one machine. The load is connected to the output end, so that the load can be directly driven to operate. The frequency conversion all-in-one machine has strong load driving capacity due to large output torque. In addition, the rotating speed of the rotating shaft of the motor is variable, so that the rotating speed of the output end of the frequency conversion all-in-one machine is also variable, and the frequency conversion all-in-one machine is suitable for driving various loads of different types.

Fig. 2 is a front view illustrating a variable frequency all-in-one machine 200 according to an embodiment of the present invention. As shown in fig. 2, in one embodiment, the frequency converter may include a reactance box 201 and a frequency conversion box 202, wherein the reactance box is used for performing voltage stabilization, interference suppression and voltage transformation on the input high-voltage alternating current, and further outputting three-phase alternating current required by the frequency converter and the control circuit. The frequency conversion box is used for carrying out frequency conversion on the three-phase alternating current output by the reactance box and further outputting the three-phase alternating current to the motor.

In one embodiment, the reactance box may be provided with an external power input interface 203 to receive high or low voltage ac power output by the power grid. The interior of the reactance box can comprise a reactance element and a control transformer, wherein the reactance element is used for stabilizing the voltage of the high-voltage or low-voltage alternating current output by the power grid, suppressing interference and the like.

The control transformer may be a small dry transformer. It may comprise a core and a coil having two or more windings, wherein the winding connecting the reactive elements is a primary winding and the remaining windings are secondary windings. The control transformer may transform alternating voltage, current and impedance. Generally, the alternating current output by the power grid is high, and is not suitable for directly supplying power to the control circuit of the frequency conversion all-in-one machine and other application equipment. Therefore, the voltage reduction treatment needs to be carried out on the frequency conversion integrated machine through the control transformer so as to supply power to local illumination, signal lamps, indicator lamps and the like of the frequency conversion integrated machine.

In one embodiment, the interior of the frequency conversion box can comprise a rectifying unit, a direct current energy storage loop, an inverting unit and a control unit. The rectifying unit may include a rectifying device and a filter, wherein the rectifying device may convert the alternating current whose direction and magnitude are changed, which is output from the reactance box, into a unidirectional pulsating direct current using an element having a unidirectional conductive characteristic. The filter is used for filtering out alternating current components in the pulsating direct current.

The direct-current energy storage loop can comprise a circuit consisting of a plurality of energy storage elements such as capacitors and inductors, and is positioned between the rectifying unit and the inverting unit. When the motor is a three-phase asynchronous motor, the motor belongs to an inductive load, and the power factor of the motor is not 1 no matter what running state the motor is in. Therefore, reactive power is always exchanged between the dc energy storage circuit and the motor, and the reactive power is buffered by the energy storage element in the dc energy storage circuit, so that the dc voltage output by the rectifying unit is always kept stable. Based on the principle, the direct current energy storage loop is used for receiving and storing the direct current transmitted by the rectifying unit, and processing interference suppression and the like on the direct current.

The inverter unit can comprise an inverter bridge, a logic control circuit and a filter circuit, and is configured to convert the direct current output by the direct current energy storage loop into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current for supplying the motor. Furthermore, the inverter bridge may include an input interface, a voltage start loop, a power switch element, a dc conversion loop, a feedback loop, and the like; the logic control circuit can comprise a pulse width modulation controller, a carrier wave generator, a modulation wave generator and the like.

In the working process of the inverter unit, the inverter bridge plays a key role in the process of converting direct current into three-phase alternating current. The inverter bridge controls the on or off of the power switch elements on the upper bridge and the lower bridge through pulse width modulation signals generated by the logic control circuit, so that three-phase alternating current with phases different by 120 degrees is obtained on three output ends of the inverter bridge so as to be output to the motor. In one embodiment, the power switching elements may be, for example, insulated gate bipolar transistors ("IGBTs") which have the advantages of high input impedance and low turn-on voltage.

The control unit is connected with the inverter unit through a communication line, and can be communicated with the inverter unit through an RS-485 serial bus. The control unit is configured to receive and process signals transmitted by the inverter unit, and transmit control signals to the inverter unit according to the processing result, so as to change the frequency of the alternating current output by the inverter unit and further control the rotating speed of the motor.

In one embodiment, the all-in-one inverter of the invention may further include an outer end cap 204. The frequency conversion integrated machine is connected with the output end of the speed reducer so as to support and fix the frequency conversion integrated machine. In addition, the outer end cover can rotate around the output end of the speed reducer according to different operation scene terrains.

Fig. 3 is a side view illustrating a variable frequency all-in-one machine 300 according to an embodiment of the present invention. It is understood that the convertible all-in-one machine 300 shown in fig. 3 is formed by rotating the convertible all-in-one machine 200 shown in fig. 2 by 90 degrees counterclockwise in the horizontal direction. The description of the convertible-frequency integrated unit 200 in fig. 2 therefore also applies to the description of the convertible-frequency integrated unit 300 in fig. 3.

As shown in fig. 3, in one embodiment, the inverter box may be respectively disposed with connection terminals 301 along both sides in a direction perpendicular to a rotation axis of the motor. The wiring terminal is used for being connected with an output line of the reactance box so as to receive the alternating current output by the reactance box. When the reactance box of the invention is detached from one side of the frequency conversion box and is installed on the other side of the frequency conversion box, the output line of the reactance box is simultaneously detached from the connecting terminal on one side of the frequency conversion box and is connected with the connecting terminal on the other side of the frequency conversion box. The output line of the reactance box is connected with the frequency conversion box through the wiring terminal, so that the disassembly and the installation are convenient and quick, and the operation of the assembly and the disassembly can be carried out in a narrow space. Preferably, the output line of the reactance box may be fixed to the connection terminal by tightening a nut.

In one embodiment, the frequency conversion box may be respectively arranged with connectors 302 along two sides perpendicular to the direction of the rotation shaft of the motor, and is used for fixedly connecting the frequency conversion box with the reactance box. The connection may be, for example, a bolt and nut arrangement. When the frequency conversion integrated machine is applied to narrow spaces such as underground and the like, the reactance box can be fixedly connected with the frequency conversion box through the connecting piece at one side of the frequency conversion box; or the reactance box can be fixedly connected with the frequency conversion box through a connecting piece on the other side of the frequency conversion box according to the requirement of the terrain. According to the reactance box and the frequency conversion box, the disassembly and the assembly are convenient and quick through the fixing mode of the bolt and the nut, and the assembly and disassembly operations can be carried out in a narrow space.

In one embodiment, the two side surfaces of the frequency conversion box may be respectively provided with a frequency conversion water channel inlet 303 and a frequency conversion water channel outlet 304 for supplying water to the heat dissipation system of the present invention. In another embodiment, the convertible frequency all-in-one machine of the invention can further comprise a first oil injection hole 305 and a second oil injection hole 306, wherein the first oil injection hole is positioned on an outer cover of the convertible frequency all-in-one machine and is used for injecting oil to the first bearing of the motor. And the second oil injection holes are positioned at two sides of the shell of the frequency conversion all-in-one machine and are used for injecting oil to the second bearing of the motor. For a description of other structures and units of the variable frequency all-in-one machine 300, please refer to fig. 2 for a description of the variable frequency all-in-one machine 200, which is not repeated herein.

Fig. 4 is a sectional view showing a variable frequency all-in-one machine 400 according to an embodiment of the present invention. It will be appreciated that figure 4 is a cross-sectional view along the axis of the motor shaft.

As shown in fig. 4, the all-in-one inverter of the invention may further include a housing 401. In one embodiment, the housing may be a cylindrical structure, for example. For a better understanding of the cylindrical structure of the housing, reference may also be made to the housing from another perspective as shown in fig. 3. The frequency conversion box 402 may be disposed on an outer surface of the housing, and may be fixedly connected to an upper surface of the housing by bolts, for example. Further, the interior of the housing may be divided into a motor cavity 403 and a reducer cavity 404 by an intermediate end cover. Further, the motor is arranged in the motor cavity, and the speed reducer is arranged in the speed reducer cavity.

In one embodiment, the stator 405 of the motor is in close contact with the housing to support and secure the motor. At the same time, when the temperature of the motor rises during operation, the temperature is quickly transmitted to the housing. The motor may include a stator 405, a rotor 406, a shaft 407, and bearings, wherein the bearings may include a first bearing 408 and a second bearing 409 connected to the reducer input. Further, the first bearing and the second bearing may be rolling bearings, wherein the rolling elements of the first bearing may be, for example, balls, and the rolling elements of the second bearing may be, for example, cylinders. The motor may be a three-phase asynchronous motor or a permanent magnet motor. When the motor is a permanent magnet motor, the iron core of the rotor is a permanent magnet, and no coil winding is required on the rotor.

When the motor works, the winding on the stator is connected with the three-phase alternating current output by the frequency converter, and then a rotating magnetic field is generated on the iron core of the stator. The rotor forms magnetoelectric power rotation torque under the action of the rotating magnetic field. Since the rotating shaft of the motor is tightly integrated with the rotor and is interference-connected with the inner rings of the first and second bearings, the rotating shaft of the motor can rotate around the axis.

In another embodiment, the speed reducer is tightly attached to the shell so as to support and fix the speed reducer. Meanwhile, when the temperature of the speed reducer rises during operation, the temperature is quickly transmitted to the shell. The speed reducer may be, for example, a planetary gear speed reducer, which may be composed of a planetary gear, a sun gear, an inner gear, a planet carrier, and the like. Compared with other speed reducers, the planetary gear speed reducer has the characteristics of high rigidity, high precision, high transmission efficiency, high torque/volume ratio, no maintenance for life and the like. Based on the characteristics, the planetary reducer is arranged at the tail end of the motor and is used for reducing the rotating speed of the motor, increasing the torque of the motor and matching the inertia.

In one embodiment, the rotating shaft of the motor may be connected to the input end of the speed reducer through a spline structure. Specifically, one end of the rotating shaft of the motor, which is close to the speed reducer, may be provided with a motor rotating shaft internal spline 410, and the input end of the speed reducer may be provided with a speed reducer input end external spline 411, so that the input end of the speed reducer and the rotating shaft of the motor rotate at the same rotating speed through the tight combination of the internal spline and the external spline. Further, a reducer output internal spline 412 may be disposed at the reducer output to couple with a load external spline to drive the load.

In another embodiment, the variable frequency all-in-one machine may further include an intermediate end cap 413 fixedly connected to the housing. The intermediate end cap may be circular in shape so that the rotation shaft of the motor can pass through the intermediate inner diameter of the intermediate end cap. The intermediate end cap is connected to a second bearing of the electric motor for supporting and fixing the electric motor. The motor and the reducer are respectively arranged on two sides of the middle end cover, wherein a certain gap is kept between the main bodies of the motor and the reducer and the middle end cover so as to thermally isolate the motor and the reducer.

In yet another embodiment, the convertible frequency all-in-one machine may further include a temperature measuring device 414 for testing the temperature of the reducer or motor bearing. The temperature measuring device may comprise a thermistor, for example, and may be mounted to the intermediate end cap adjacent to the second bearing. The temperature value measured by the temperature measuring device can be displayed through a liquid crystal screen arranged on the frequency conversion all-in-one machine.

Fig. 5 is a partial water path structure diagram showing the variable frequency all-in-one machine 400 according to the embodiment of the invention. The device comprises a left drawing and a right drawing, wherein the left drawing rotates around a rotating shaft of a motor for a certain angle to form the right drawing.

As shown in fig. 5, in an embodiment, the all-in-one inverter may further include a heat dissipation system. The water pipe system can comprise water channels, a plurality of water seats and water pipes, wherein the water channels are respectively arranged at the bottom of the frequency conversion box, the shell and the middle end cover, and the water seats and the water pipes are used for being connected with the water channels. The heat dissipation system is used for enabling the water channel to form a water flow channel through the connection of the water seat and the water pipe when the frequency conversion all-in-one machine works, and therefore heat dissipation is conducted on the frequency conversion box, the shell and the middle end cover of the frequency conversion all-in-one machine.

In one embodiment, the frequency conversion box is respectively provided with a frequency conversion water channel water inlet and a frequency conversion water channel water outlet along two sides in the direction perpendicular to the rotating shaft of the motor. And a plurality of water seats are respectively arranged on the shell on the same side with the water inlet and the water outlet of the variable-frequency water channel. The water outlet of the variable frequency water channel on one side of the variable frequency box is connected with the water seat on one side of the motor cavity through a first water pipe, and the water seat on the other side of the motor cavity is connected with the water seat on the other side of the speed reducer cavity through a second water pipe, so that the water channel forms a first water flow passage.

In another embodiment, two ends of the first water pipe are respectively connected with a variable frequency water channel water outlet on the other side of the variable frequency box and a water seat on the other side of the motor cavity. And simultaneously, two ends of the second water pipe are respectively connected with the water seat on one side of the motor cavity and the water seat on one side of the speed reducer cavity, so that the water channel forms a second water flow channel, and the water channel conversion is realized. The principle of formation of the first water flow path is briefly described below.

The water channel may be, for example, a recessed channel as shown in the left and right figures of fig. 5, in which a grating is provided to restrict the flow of water so as to form a specific water flow path. To indicate the direction of water flow in the channel, the right drawing also shows the direction of water flow when the cooling system is in operation, in dashed lines with arrows. And a variable-frequency water channel water inlet and a variable-frequency water channel water outlet are respectively arranged at two ends of the water channel at the bottom of the variable-frequency box. The water inlet of the frequency conversion water channel is used for being connected with an external water source so as to provide cooling water for the whole heat dissipation system. And the frequency conversion water channel water outlet is used for discharging water flowing through the water channel at the bottom of the frequency conversion box.

Further, water seats 1, 4 and 5 are arranged on the shell on the same side as the frequency conversion box, wherein the water seat 4 is arranged on the outer surface of the cavity of the speed reducer; and water seats 2, 3 and 6 are arranged on the other side of the shell, wherein the water seat 3 is arranged on the outer surface of the cavity of the speed reducer. When the heat dissipation system works, the frequency conversion water channel water outlet is connected with the water seat 1 through the first water pipe, so that water discharged from the frequency conversion water channel water outlet flows into the water channel on the shell through the water pipe. Specifically, water flows out of the water seat 1 and flows to the water seat 2 in a clockwise direction (based on the direction from the motor to the reducer) along the direction indicated by the dotted line with the arrow on the housing, thereby cooling the motor inside the housing.

Since the second water pipe is connected between the water seat 2 and the water seat 3, water flows toward the water seat 3 through the water pipe when flowing out of the water seat 2. The water seat 3 is connected with the water seat 4 through a short water channel. An annular groove water channel is arranged on the middle end cover, and a water inlet and a water outlet which are communicated with the water channel of the middle end cover are arranged on two sides of the water seat 4. Make water flow to water seat 4 from water seat 3 like this to through the water course water inlet of middle end cover, after circulating a week in the water course of middle end cover, flow out from the water course delivery port of middle end cover, thereby it is right to realize the middle end cover cools down.

The water channel water outlet of the middle end cover is communicated with the water channel on the shell outside the speed reducer, so that water flowing out of the water channel water outlet of the middle end cover flows for a circle along the water channel on the shell in a clockwise direction (taking the direction from the motor to the speed reducer as a reference), and is finally discharged from the water seat 5. Alternatively, the reduction gear can be cooled by plugging the water seat 5 and finally draining the water from the water seat 6. In summary, in the working process of the heat dissipation system, the external water source sequentially passes through the water inlet of the frequency conversion water channel, the water channel at the bottom of the frequency conversion tank, the water outlet of the frequency conversion water channel, the water seat 1, the water channel on the motor housing, the water seat 2, the water seat 3, the water seat 4, the water channel on the middle end cover and the water channel on the speed reducer housing, and is finally discharged from the water seat 5, so that a first water flow passage is formed, and the heat dissipation and the temperature reduction of the frequency conversion all-in-one machine.

Because the operation demand in narrow space in the pit, when the outer end cover rotation 180 degrees with the frequency conversion all-in-one to when the reactance case is dismantled and is installed in the other side of frequency conversion case, because the reactance case has sheltered from the frequency conversion water course water inlet of frequency conversion case one side, consequently need insert the frequency conversion water course water inlet of frequency conversion case opposite side with outside water source, in order to realize the water course conversion.

Specifically, the first water pipe and the second water pipe in the first water flow passage can be detached respectively, the first water pipe is connected with the frequency conversion water channel water outlet and the water seat 2 of the frequency conversion box, and the second water pipe is connected with the water seat 1 and the water seat 4. Through the connection, an external water source sequentially passes through a variable frequency water channel water inlet on the other side of the variable frequency box, a water channel at the bottom of the variable frequency box, a variable frequency water channel water outlet on the other side of the variable frequency box, the water seat 2, a water channel on the motor shell, the water seat 4, a water channel on the middle end cover and a water channel on the speed reducer shell and is finally discharged from the water seat 5, so that a second water flow channel is formed, and water channel conversion is realized. For a detailed formation principle of the second water flow path, please refer to the foregoing description about the formation principle of the first water flow path, and the description thereof is omitted here.

Fig. 6 is a partially enlarged view illustrating an oil control device of the variable frequency all-in-one machine according to an embodiment of the present invention. It is to be understood that the partially enlarged structural view shown in fig. 6 is a structural view of the oil control member shown by a circle in fig. 4. In order to better understand the structure and the working principle of the oil control device, structures such as an oil filling pipe, a bearing outer ring, a bearing inner ring, a rolling body, a motor rotating shaft and the like are also drawn in fig. 6.

As shown in FIG. 6, the all-in-one inverter of the invention can further comprise an oil filling hole and an oil control device which are arranged on the shell. The oil control device is arranged at a bearing of the motor, and may include oil control parts such as an oil injection pan 601, an oil baffle pan 602, an oil thrower 603 and the like, and an oil storage box arranged at a lower part of the bearing. The oil injection disc, the oil baffle disc, the oil thrower disc, the bearing inner ring and the bearing outer ring form a bearing chamber. The oil filling hole is connected with an oil filling pipe, and the oil filling pipe extends to a gear of the speed reducer and an oil filling disc of the motor. During the process of filling oil into the motor bearing, lubricating oil is injected into the oil filling hole, flows through the oil filling pipe and is finally injected into the gear of the speed reducer and the bearing chamber of the motor, and therefore the gear of the speed reducer and the bearing of the motor are lubricated. The oil filler point can carry out the oiling to the speed reducer on the one hand, on the other hand can also regard as the air vent of speed reducer to dispel the heat to the speed reducer.

When the lubricating oil injected into the bearing chamber of the motor is excessive, the oil control device can control the oil amount of the lubricating oil remaining in the bearing chamber so as to effectively lubricate the bearing. Specifically, the oil injection disc is of an annular structure, a concave groove is formed in the end face of the outer diameter of the oil injection disc, and a plurality of holes are formed in the concave groove. The outlet of the oil filling pipe is aligned with the concave groove of the oil filling disc, and when lubricating oil flows out of the oil filling pipe, the concave groove is filled with the lubricating oil and is extruded into the bearing chamber through a plurality of holes in the concave groove. Through constantly oiling to the oil filler point, lubricating oil in the bearing chamber can be more and more, when being full of in the bearing chamber, can flow along the gap between oil baffle disc and the disc to because the oil storage box of gravity effect inflow bearing lower part. At the moment, whether the oiling process is finished or not can be judged by observing the oil amount in the oil storage box by a worker.

When the motor runs, the bearing inner ring, the rolling bodies and the oil thrower disc fixed on the rotating shaft start to rotate along with the rotating shaft of the motor, so that all parts of the bearing inner ring and all the rolling bodies pass through the bearing chamber filled with oil, and the bearing inner ring, the bearing outer ring and the rolling bodies are lubricated without dead angles. Meanwhile, in the process of rapid rotation of the rotating shaft, lubricating oil in the bearing chamber is gathered to the part of the bearing chamber close to the outer ring under the action of centrifugal force, and redundant lubricating oil is thrown out of the bearing chamber through a gap between the oil thrower and the oil baffle disc and finally flows into the oil storage box.

It should be understood that the terms "first", "second", "third" and "fourth", etc. in the claims, the description and the drawings of the present invention are used for distinguishing different objects and are not used for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this disclosure, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and claims of this application, the singular form of "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this specification refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

Although the present invention is described in the above embodiments, the description is only for the convenience of understanding the present invention, and is not intended to limit the scope and application of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A variable frequency all-in-one machine comprising:

a frequency converter for converting the frequency of the input alternating current and outputting the converted alternating current;

the motor is used for receiving the alternating current converted and output by the frequency converter so as to drive a rotating shaft of the motor to rotate; and

a speed reducer comprising:

the input end is connected with the rotating shaft of the motor so as to rotate along with the rotating shaft of the motor;

an output end rotating at a lower rotational speed than the input end; and

a transmission disposed between the input and output for transmitting power from the input to the output and reducing the rotational speed of the output relative to the rotational speed of the input.

2. The variable-frequency all-in-one machine according to claim 1, wherein a rotating shaft of the motor is connected with an input end of the speed reducer through an external spline and an internal spline which are respectively arranged on the rotating shaft and the input end of the speed reducer, and the output end of the speed reducer is provided with the internal spline so as to be connected with a load.

3. The variable frequency all-in-one machine of claim 1, wherein the frequency converter comprises:

the reactance box is used for carrying out voltage stabilization, interference suppression and voltage transformation treatment on the input alternating current; and

a frequency conversion box for frequency-converting the alternating current processed and output by the reactance box so as to output the alternating current to the motor,

the connecting piece and the wiring terminal are respectively arranged on two sides of the frequency conversion box along the direction perpendicular to the rotating shaft of the motor, so that the reactance box is fixedly connected with one side or the other side of the frequency conversion box through the connecting piece, and the alternating current output by the reactance box is received through the wiring terminal on the side.

4. The variable frequency all-in-one machine according to claim 3, further comprising a housing, the variable frequency box being disposed on an outer surface thereof, and an interior thereof being partitioned into a motor cavity and a reducer cavity so as to dispose the motor and the reducer, respectively.

5. The variable frequency all-in-one machine according to claim 4, wherein the housing is a cylindrical structure, and the speed reducer and a stator part of the motor are respectively attached to the inner wall of the cylindrical structure.

6. The variable-frequency all-in-one machine of claim 5, further comprising an intermediate end cover dividing the housing into a motor cavity and a reducer cavity, the intermediate end cover being fixedly connected with the housing, the intermediate end cover being connected with one of the bearings of the motor so as to support and fix the motor; the motor and the speed reducer which keep a gap with the middle end cover are respectively arranged on two sides of the middle end cover so as to be thermally isolated.

7. The variable frequency all-in-one machine according to claim 6, further comprising a heat dissipation system comprising water channels and a plurality of water seats for connecting the water channels, the water channels and the water seats being arranged on the bottom of the variable frequency box, the shell and the intermediate end cover, respectively, and the water channels and the water seats are matched with each other so as to form a water flow path for dissipating heat of the variable frequency all-in-one machine.

8. The variable frequency all-in-one machine according to claim 7, wherein the variable frequency box is provided with a variable frequency water channel water inlet and a variable frequency water channel water outlet respectively arranged along two sides perpendicular to the direction of the rotation shaft of the motor, and a plurality of water seats are respectively arranged on the shell body on the same side as the variable frequency water channel water inlet and the variable frequency water channel water outlet, wherein

A water outlet of a variable frequency water channel at one side of the variable frequency box is connected with a water seat at one side of the motor cavity through a first water pipe, and a water seat at the other side of the motor cavity is connected with a water seat at the other side of the speed reducer cavity through a second water pipe, so that the water channel forms a first water flow passage; or

And the two ends of the second water pipe are respectively connected with the water seat on one side of the cavity of the motor and the water seat on one side of the cavity of the speed reducer, so that the water channels form a second water flow passage.

9. The variable frequency all-in-one machine according to claim 1, further comprising an oil filler hole arranged on the housing so as to inject lubricating oil to a bearing of the motor through the oil filler hole.

10. The convertible frequency all-in-one machine according to claim 9, wherein an oil control device including an oil injection pan, an oil baffle pan, an oil thrower pan, and an oil storage box disposed at a lower portion of the bearing is assembled at the bearing of the motor so as to control an amount of the lubricating oil injected to the bearing in operation.