A safety and explosion-proof frequency conversion and speed regulation integrated machine

Abstract

The application relates to a safety and explosion-proof type frequency conversion speed regulation integrated machine, which comprises a motor, a frequency converter, a connecting shell, and a fan, a first heat dissipation channel is formed among the connecting shell, a heat conduction plate and a motor shell of the motor, a first air inlet and a first air outlet are arranged on the first heat dissipation channel, a second air inlet and a second air outlet are arranged on the motor shell of the motor, the second air inlet is communicated with the first heat dissipation channel, and a fan air outlet of the fan is communicated with the first air inlet. The safety and explosion-proof type frequency conversion speed regulation integrated machine can be applied to a working condition environment close to combustible gas, and has the advantages of small volume, light weight and convenient transportation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric motor, in particular to a safety increased and explosion-proof type variable frequency speed regulation integrated machine, which is used in the working condition environment close to flammable gas. BACKGROUND

[0002] The rotating speed of mining equipment often needs to be adjusted according to different working conditions, therefore, variable frequency speed regulation motor is widely used in mining equipment. At present, the implementation scheme of variable frequency speed regulation motor is that the frequency converter and the motor are separately placed and installed, both of which occupy a certain space, and the connecting members such as cables for transmitting control signals and power signals between the two also occupy a certain space, and with the increase of the length of the cable, the signals transmitted between the two are easily disturbed by environmental noise, and the transmission efficiency is reduced due to the influence of noise, therefore, the variable frequency speed regulation motor has the disadvantages of low space utilization and weak signal anti-interference ability.

[0003] In order to solve this problem, a permanent magnet variable frequency motor is disclosed in the prior art, which is composed of a permanent magnet motor and a frequency converter; the permanent magnet motor and the frequency converter are arranged in two independent cavities and are fixedly connected together through a water cooling plate arranged at the lower part of the frequency converter and an explosion-proof panel arranged at the upper part of the permanent magnet motor; a motor cooling water groove is milled in the cylindrical shell wall of the permanent magnet motor, the frequency converter is composed of a variable frequency power converter and a filter reactor; a variable frequency power converter cooling water groove is arranged in the cold water plate at the bottom of the frequency converter. The permanent magnet variable frequency motor solves the problems of low space utilization and weak signal anti-interference ability by arranging the permanent magnet motor and the frequency converter together.

[0004] When the above-mentioned permanent magnet variable frequency motor is used in the environment close to flammable gas at the wellhead of an oil drilling platform, the shell thereof should adopt an explosion-proof shell, the motor with the explosion-proof shell can withstand the internal explosion of the flammable mixture that has entered the shell without being damaged, so as to not ignite the external explosion environment formed by one or more gases or vapors. Compared with other types of explosion-proof products, the explosion-proof type shell needs to select higher strength materials, and the product made of the higher strength materials will be larger and bulkier. In addition, the permanent magnet variable frequency motor uses a water cooling plate, a cooling water groove, a cooling water pump, a cooling pipeline and anti-freezing liquid, so that the permanent magnet variable frequency motor needs to occupy a larger space and is inconvenient to transport. SUMMARY

[0005] The purpose of the present application is to provide a safety increased and explosion-proof type variable frequency speed regulation integrated machine, which can be applied to the working condition environment close to flammable gas, and has small volume, light weight and convenient transportation.

[0006] In order to achieve the above object, the application provides a safety and explosion-proof type variable frequency speed regulation integrated machine, which comprises a motor, a frequency converter arranged above the motor, a connecting shell connected with the motor and the frequency converter, and a fan, the frequency converter comprises a heat conduction plate, a power device mounted on the heat conduction plate, and an explosion-proof shell, the power device is located in a closed cavity surrounded by the heat conduction plate and the explosion-proof shell, a first heat dissipation channel is formed between the connecting shell, the heat conduction plate and a motor shell of the motor, a first air inlet and a first air outlet are arranged on the first heat dissipation channel, a second air inlet and a second air outlet are arranged on the motor shell of the motor, the second air inlet is communicated with the first heat dissipation channel, and the fan outlet of the fan is communicated with the first air inlet; when the fan works, the airflow generated by the fan enters the first heat dissipation channel through the first air inlet, flows out of the first air outlet after flowing through the first heat dissipation channel, and at the same time, the airflow in the first heat dissipation channel enters the motor shell through the second air inlet, and flows out of the second air outlet after flowing through the stator core, the rotor core and the winding.

[0007] In one embodiment, the winding wire of the motor is 0.038mm polyimide film 66% 2-layer overlapping.

[0008] In one embodiment, the bottom lead or the face lead of each coil of the winding is directly welded on the center ring, the bottom lead or the face lead is uniformly distributed on the center ring, and the center ring is made of flat copper wire.

[0009] In one embodiment, the specification of the flat copper wire is 20mm*6mm.

[0010] In one embodiment, the stator core and the rotor core of the motor are both provided with radial ventilation grooves.

[0011] In one embodiment, a protective net is mounted on the fan air inlet of the fan.

[0012] In one embodiment, the fan air inlet of the fan is arranged downward.

[0013] In one embodiment, one end of the frequency converter is inwardly recessed to form a fan mounting groove, and the fan is mounted on the connecting shell and partially located in the fan mounting groove.

[0014] In one embodiment, a fan mounting seat is arranged on the connecting shell, the fan is fixed on the fan mounting seat, and the first air inlet is arranged on the fan mounting seat.

[0015] In one embodiment, the second air inlet is opposite to the first air inlet, and a fence is mounted on the first air outlet.

[0016] The difference between this invention and existing technologies lies in the fact that the explosion-proof and enhanced-safety variable frequency speed control unit provided by this invention effectively ensures its explosion-proof and enhanced-safety performance by installing the power devices of the frequency converter (such as rectifiers, inverters, main circuits, etc.) within a closed cavity formed by a heat-conducting plate and an explosion-proof shell. This allows the entire unit to be used in working environments close to flammable gases. Furthermore, by forming a first heat dissipation channel between the connecting shell, the heat-conducting plate, and the motor shell, the airflow generated by the fan can flow through this first heat dissipation channel, exchange heat with the heat-conducting plate, and then flow out from the first air outlet of the first heat dissipation channel, thereby cooling the frequency converter. Simultaneously, the airflow in the first heat dissipation channel also enters the motor shell from the second air inlet, flows through the stator core, rotor core, and windings, and then flows out from the second air outlet, cooling the motor. This invention, by forming two heat dissipation channels for the frequency converter and the motor, with each channel directly connected to the external environment, can achieve efficient heat dissipation for both the motor and the frequency converter. This invention connects the motor and frequency converter through a connecting housing, which forms a wind-cooled heat dissipation channel. Compared with existing water-cooled heat dissipation structures, this achieves effective heat dissipation while reducing the overall size and weight of the machine. Therefore, the explosion-proof variable frequency speed control unit provided by this invention can be applied to working environments close to flammable gases, and is small in size, lightweight, and easy to transport. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0018] Figure 1 This is a structural schematic diagram of an explosion-proof variable frequency speed control integrated machine according to one embodiment of the present invention;

[0019] Figure 2 yes Figure 1 The image shown is a front sectional view of the explosion-proof variable frequency speed control unit with increased safety features.

[0020] Figure 3 yes Figure 2 A magnified view at point M;

[0021] Figure 4 yes Figure 1 The right view of the explosion-proof variable frequency speed control unit shown;

[0022] Figure 5 yes Figure 1 The diagram shows the structure of the heat-conducting plate of the explosion-proof variable frequency speed control integrated machine.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1 - motor; 11 - motor housing; 12 - winding; 13 - second air outlet; 14 - base; 2 - frequency converter; 21 - heat-conducting plate; 22 - explosion-proof housing; 23 - fan mounting groove; 3 - connecting housing; 31 - fan mounting seat; 4 - fan; 41 - fan air inlet; 5 - first heat dissipation channel; 51 - first air outlet. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present disclosure will be described clearly and completely in the following with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0026] The specific embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0027] In the above description of the present disclosure, unless explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless the present disclosure explicitly specifies otherwise, those skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific circumstances.

[0028] In the present disclosure, some orientation terms are defined. Unless stated otherwise, the orientation terms used, such as "up, down, left, right", refer to the definitions of the safety and explosion-proof variable frequency speed regulation integrated machine in normal use, and are consistent with the up, down, left and right directions shown in the accompanying drawings. "In, out" refers to the inside and outside relative to the outline of each component. These orientation terms are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of the present disclosure. Figure 2

[0029] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for descriptive purposes, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, such as two, three or more, unless explicitly specified otherwise.

[0030] Appropriate reference​Figure 1 As shown, the basic embodiment of the explosion-proof frequency conversion and speed regulation integrated machine provided by the present application comprises a motor 1, a frequency converter 2 arranged above the motor 1, a connecting housing 3 connecting the motor 1 and the frequency converter 2, and a fan 4. In one embodiment, the motor 1 can adopt an existing motor, comprising a motor housing 11, a rotating shaft mounted on the motor housing 11, a base 14 arranged at the bottom of the motor housing 11, a stator core, a rotor core, a winding, a terminal box and other components.

[0031] The frequency converter 2 comprises a heat-conducting plate 21, power devices mounted on the heat-conducting plate 21, and an explosion-proof housing 22. The power devices are located in an enclosed cavity formed by the heat-conducting plate 21 and the explosion-proof housing 22. The power devices can comprise main circuit, rectifier, inverter, smoothing circuit and other devices. As shown, Figure 5 The heat-conducting plate 21 can be made of copper with good heat-conducting performance. When the power devices are mounted on the heat-conducting plate 21, heat-conducting silicon grease can be applied on the heat-conducting plate 21 to improve the heat transfer capacity between the power devices and the heat-conducting plate 21. The frequency converter 2 with the explosion-proof housing 22 can make the combustible gas inside it explode without damage, and any joint surface and structural hole on the explosion-proof housing 22 will not ignite the external explosion environment formed by one or more gases or vapors. In one embodiment, the explosion-proof housing 22 is a type II explosion-proof housing. Type II explosion-proof housing needs to withstand a water pressure test of at least 1.5 Mpa, so type II explosion-proof housing needs to use higher strength materials compared with other types of explosion-proof products.

[0032] As shown, Figure 2 The connecting housing 3, the heat-conducting plate 21 and the motor housing 11 of the motor 1 form a first heat dissipation channel 5. A first air inlet and a first air outlet 51 are arranged on the first heat dissipation channel 5. The first air inlet is located at the left end of the first heat dissipation channel 5, and the first air outlet 51 is located at the right end of the first heat dissipation channel 5.

[0033] A second air inlet and a second air outlet 13 are arranged on the motor housing 11 of the motor 1. The second air inlet is in communication with the first heat dissipation channel 5. The fan outlet of the fan 4 is in communication with the first air inlet.

[0034] Reference Figure 1 , Figure 2As shown by the middle arrow, when the fan 4 is working, the airflow generated by the fan 4 enters the first heat dissipation channel 5 through the first air inlet, and flows out of the first air outlet 51 after flowing through the first heat dissipation channel 5, while the airflow in the first heat dissipation channel 5 enters the motor housing 11 through the second air inlet, and flows out of the second air outlet 13 after flowing through the stator core, the rotor core and the winding 12.

[0035] The above basic embodiment provides that, when the safety and explosion-proof type frequency conversion and speed regulation all-in-one machine is used, the fan 4 works to transport the air in the external environment into the first heat dissipation channel 5, and divide the air into two parts in the first heat dissipation channel 5, one part of the airflow flows through the first heat dissipation channel 5, exchanges heat with the heat conduction plate 21, and then flows out of the first air outlet 51 of the first heat dissipation channel 5. Since the power device of the frequency converter is installed in the closed cavity formed by the heat conduction plate 21 and the explosion-proof shell 22, the power device can be prevented from contacting the gas in the external environment, and the power device of the frequency converter 2 is installed on the heat conduction plate 21, and the heat conduction plate 21 can directly exchange heat with the gas flowing in the first heat dissipation channel 5, so as to reduce the temperature of the power device, thereby effectively ensuring the safety and explosion-proof performance, and enabling the all-in-one machine to be applied to the working condition environment close to the combustible gas. The other part of the airflow enters the motor housing 11 through the second air inlet, and flows out of the second air outlet 13 after flowing through the stator core, the rotor core and the winding 12, thereby dissipating heat for the motor. The application forms two heat dissipation channels for the frequency converter 2 and the motor 1 through the connecting housing 3, and the two heat dissipation channels are directly communicated with the external environment, so that the motor 1 can be effectively dissipated, and the frequency converter 2 can be effectively dissipated at the same time.

[0036] The application connects the motor 1 and the frequency converter 2 through the connecting housing 3, and forms the first heat dissipation channel 5 through the connecting housing 3, so that the volume and weight of the whole machine can be reduced while effectively dissipating heat, compared with the existing water-cooled heat dissipation structure.

[0037] In the application, as shown in Figure 2 , Figure 3 The air flowing through the motor housing 11 flows through the winding 12, and the winding electromagnetic wire of the motor 1 should adopt a corona-resistant thin film electromagnetic wire to avoid local discharge of the winding 12 to ignite the combustible gas in the external environment. In one embodiment, the winding electromagnetic wire of the motor 1 adopts MYFCRB-45 / 200 sintered wire, and 0.038mm polyimide film 66% is wrapped 2 layers. The film has good high and low temperature resistance and excellent mechanical properties, and maintains stable dielectric properties, good chemical stability and moisture resistance in a wide temperature range and frequency range, and also has good radiation resistance.

[0038] In the application, further preferably, the bottom lead or face lead of each coil of the winding 12 is directly welded on the center ring, the bottom lead or face lead is uniformly distributed on the center ring, and the center ring is made of flat copper wire. Directly welding the bottom lead or face lead of each coil of the Y connection return circuit on the center ring can avoid the welding defects such as excessive end welding, virtual welding and missing welding caused by mutual welding of multiple leads. Meanwhile, uniform welding can avoid the influence of local heat concentration.

[0039] In the application, as shown in Figure 2 The second air inlet and the second air outlet 13 formed on the motor housing 11 are respectively located at the two ends of the motor housing 11, the second air inlet is located at the upper end of the motor housing 11, and the second air outlet is located at the lower end of the motor housing 11, so that the airflow flowing in the motor housing 11 can better dissipate heat for the stator core, the rotor core and the winding in the motor housing 11. In order to make the airflow flowing through the motor housing 11 better dissipate heat for the stator core and the rotor core, in an embodiment, the stator core and the rotor core of the motor 1 are both provided with radial ventilation grooves. By providing the radial ventilation grooves on the stator core and the rotor core, the airflow can flow through these radial ventilation grooves, so that the stator core and the rotor core can be efficiently cooled.

[0040] In the application, as shown in Figure 2 , Figure 4 The upper surface of the motor housing 11 constituting the first heat dissipation channel 5 is a cylindrical surface, the heat conduction plate 21 is a plane, and the front and rear two side surfaces of the connecting housing 3 are vertical side walls, so that the first heat dissipation channel 5 forms a channel with small height in the middle and large height on the front and rear sides, which can make the particulate matter that may enter the first heat dissipation channel 5 gather in the deep groove positions on the front and rear sides of the first heat dissipation channel 5, and the second air inlet is located at the upper end of the cylindrical surface, thereby reducing the possibility of particulate matter entering the interior of the motor 1 from the second air inlet to block the radial ventilation grooves on the stator core and the rotor core.

[0041] As shown in Figure 1As shown, the fan inlet 41 of the fan 4 is arranged on the upper side of the all-in-one machine, and the second outlet 13 of the motor 1 is arranged on the bottom of the all-in-one machine. Compared with the prior art in which the fan inlet is arranged on the bottom, the all-in-one machine can avoid being affected by dust and willow catkins in the external environment, thereby avoiding the situation that the temperature of the motor winding exceeds the limit temperature of the insulation winding of the increased safety motor due to the fact that the fan inlet located on the bottom is not easy to be found to be blocked. In the present application, the fan inlet 41 of the fan 4 is provided with a protective net, which can prevent foreign matters in the external environment from being sucked into the fan 4. At the same time, the protective net is located at a high position, and the operator can timely find that the protective net is blocked, so that the operator can timely clean and replace, thereby effectively avoiding the winding over-temperature caused by insufficient air intake and avoiding motor explosion. Further, the fan inlet 41 of the fan 4 is arranged downward. Arranging the opening of the fan inlet 41 downward can reduce the possibility of foreign matters in the external environment entering the fan 4.

[0042] As shown in Figure 1 , Figure 2 , Figure 5 , one end of the frequency converter 2 is inwardly recessed to form a fan mounting groove 23, and the fan 4 is partially located in the fan mounting groove 23. Specifically, the left middle part of the frequency converter 2 housing is provided with a rectangular fan mounting groove 23, and the fan 4 is partially accommodated in the fan mounting groove 23, which can further reduce the volume of the all-in-one machine, so that the all-in-one machine is miniaturized and convenient for transportation.

[0043] In the present application, the fan 4 can be installed at any appropriate position of the all-in-one machine. In one embodiment, as shown in Figure 2 , the fan 4 is installed on the connecting housing 3. Specifically, the fan mounting seat 31 is arranged on the connecting housing 3, the fan 4 is fixed on the fan mounting seat 31 by bolts, and the first inlet is arranged on the fan mounting seat 31. By fixing the fan 4 on the fan mounting seat 31, the fan outlet of the fan 4 can be directly communicated with the first inlet on the connecting housing 3, so that the structure of the all-in-one machine is simpler.

[0044] In the present application, further preferably, as shown in Figure 2 , the second inlet is opposite to the first inlet, and as shown in Figure 4 , the first outlet 51 is provided with a fence. By arranging the second inlet opposite to the first inlet, the airflow generated by the fan 4 can more easily enter the motor 1. By arranging the fence on the first outlet 51, the air volume between the first heat dissipation channel 5 and the second heat dissipation channel in the motor housing 11 can be adjusted, so that the frequency converter 2 and the motor 1 can both effectively dissipate heat.

[0045] In conclusion, the safety-increased explosion-proof frequency conversion speed regulation integrated machine integrates the motor 1 and the frequency converter 2 by the connecting shell 3, and the reasonable configuration of the motor 1, the frequency converter 2, the fan 4 and the connecting shell 3 makes the integrated machine small in size, light in weight, without the need of separately designing a frequency converter room, and can effectively reduce the maintenance cost. Meanwhile, the first heat dissipation channel 5 for heat dissipation of the frequency converter 2 and the second heat dissipation channel for heat dissipation of the motor 1 are arranged, and the motor winding insulation design is matched, so that the integrated machine has good overall heat dissipation effect, low temperature rise, and is more suitable for the working condition environment close to the combustible gas.

[0046] While the present specification has shown and described several embodiments of the present application, it is to be understood that, as these embodiments have been presented by way of example only, many changes, modifications, and substitutions can be made by one of ordinary skill in the art without departing from the spirit and scope of the application. It is to be understood that in some instances, several of the above-described features can be combined into a single aspect. It is also to be understood that features described herein as a means for achieving a particular result are intended to cover equivalents thereof that perform the same function. It is the spirit and scope of the following claims to define the scope of the claimed application.

Claims

1. A safety-increased explosion-proof frequency control and speed regulation integrated machine, characterized in that The motor (1), the frequency converter (2) arranged above the motor (1), the connecting shell (3) connecting the motor (1) and the frequency converter (2), and the fan (4), the frequency converter (2) comprises a heat conduction plate (21), power devices mounted on the heat conduction plate (21) and an explosion-proof housing (22), the power devices are located in the closed cavity surrounded by the heat conduction plate (21) and the explosion-proof housing (22), a first heat dissipation channel (5) is surrounded between the connecting shell (3), the heat conduction plate (21) and the motor shell (11) of the motor (1), the first heat dissipation channel (5) is provided with a first air inlet and a first air outlet (51), the motor shell (11) of the motor (1) is provided with a second air inlet and a second air outlet (13), the second air inlet is communicated with the first heat dissipation channel (5), the fan outlet of the fan (4) is communicated with the first air inlet, when the fan (4) works, part of the airflow generated by the fan (4) enters the first heat dissipation channel (5) through the first air inlet, and then flows out from the first air outlet (51) after flowing through the first heat dissipation channel (5), and the other part of the airflow in the first heat dissipation channel (5) enters the motor shell (11) from the second air inlet, and then flows out from the second air outlet (13) after flowing through the stator core, the rotor core and the winding (12), wherein the second air outlet (13) is located at the lower end of the motor shell (11).

2. The safety-increased and explosion-proof frequency control and speed regulation all-in-one machine according to claim 1, characterized in that, The bottom lead or surface lead of each coil of the winding is directly welded on the center ring, and the bottom lead or surface lead is uniformly distributed on the center ring.

3. The safety-increased and explosion-proof frequency control and speed regulation all-in-one machine according to claim 2, characterized in that, The center ring is made of flat copper wire, and the specification of the flat copper wire is 20mm*6mm.

4. The safety-increased and explosion-proof frequency control and speed regulation all-in-one machine of claim 1, wherein, The winding wire of the motor (1) is 0.038mm polyimide film 66% 2-layer overlapping.

5. The safety-increased and explosion-proof frequency control speed regulation all-in-one machine according to claim 1, characterized in that, The stator core and the rotor core of the motor (1) are both provided with radial ventilation grooves.

6. The safety-increased and explosion-proof variable frequency speed regulation all-in-one machine according to any one of claims 1-5, characterized in that, The fan inlet (41) of the fan (4) is provided with a protective net.

7. The safety-increased and explosion-proof frequency control and speed regulation all-in-one machine according to claim 6, characterized in that, The fan inlet (41) of the fan (4) is arranged downward.

8. The safety-increased and explosion-proof frequency control and speed regulation all-in-one machine according to claim 6, characterized in that, One end of the frequency converter (2) is inwardly recessed to form a fan mounting groove (23), and the fan (4) is mounted on the connecting shell (3) and partially located in the fan mounting groove (23).

9. The safety-increased and explosion-proof frequency control and speed regulation all-in-one machine according to claim 8, characterized in that, The connecting shell (3) is provided with a fan mounting seat (31), the fan (4) is fixed on the fan mounting seat (31), and the first air inlet is arranged on the fan mounting seat (31).

10. The safety-increased and explosion-proof frequency control integrated machine of claim 9, wherein, The second air inlet is opposite to the first air inlet, and the first air outlet (51) is provided with a fence.

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