Flame-proof high-voltage three-phase asynchronous motor

Abstract

The application relates to the technical field of high-voltage motors, in particular to a flame-proof high-voltage three-phase asynchronous motor, which comprises a motor shell and a rear shell, a stator, a stator winding, a rotor and a rotor winding are arranged in the motor shell, and a fan blade for blowing air is arranged in the rear shell; the rear shell is fixedly arranged at the rear side of the motor shell; a circulating cooling assembly is arranged for cooling the motor shell; the circulating cooling assembly utilizes the characteristics of a vortex tube that separates cold air flow and hot air flow, uses low-temperature gas to perform circulating cooling on the motor shell, better cooling effect is obtained, a closed outer circulation is formed outside the motor shell, the possibility of external sundries entering the motor is reduced, and the frequency of explosion is reduced to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of high-voltage motor technology, specifically to an explosion-proof high-voltage three-phase asynchronous motor. Background Technology

[0002] High-voltage motors refer to motors with a rated voltage of 1000V or higher. 6000V and 10000V are commonly used. Due to advancements in power electronics technology, AC asynchronous motors are currently the most widely used. Explosion-proof motors are a type of explosion-proof motor. Compared to other explosion-proof motors, their explosion-proof focus is on using a high-strength shell and strictly controlled joint surfaces to prevent internal electrical sparks from being conducted to external flammable and explosive spaces.

[0003] High-voltage electric motors are commonly used in the coal, mining, or metallurgical industries, where the operating environment is filled with a large amount of dust or other gases that may cause deflagration. Therefore, high explosion-proof performance is required in this environment. In order to balance heat dissipation and prevent external dust and flammable gases from entering the motor, the heat dissipation of high-voltage explosion-proof motors usually relies on exhausting air outwards by fan blades and drawing air in from the motor casing. This method has poor cooling effect and also increases the possibility of flammable substances entering the motor casing. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an explosion-proof high-voltage three-phase asynchronous motor, which can effectively solve the problem of how to improve heat dissipation while ensuring safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides an explosion-proof high-voltage three-phase asynchronous motor, including a motor housing and a rear housing. The motor housing houses a stator, stator windings, a rotor, and rotor windings. The rear housing houses a blower fan. The invention also includes a circulating cooling assembly for cooling the interior of the motor housing, with the rear housing fixedly mounted on the rear side of the motor housing.

[0007] The circulating cooling assembly includes a high-pressure air pump and a vortex tube. The high-pressure air pump provides air pressure, and the vortex tube splits the high-pressure gas into a hot air stream and a cold air stream. An exhaust pipe is vertically and fixedly installed near the end cover of the motor housing, and an intake pipe is vertically installed on the rear housing. The top of the intake pipe is connected to the cold air end of the vortex tube, the top of the exhaust pipe is connected to the intake end of the high-pressure air pump, and the exhaust end of the high-pressure air pump is connected to the intake end of the vortex tube.

[0008] Furthermore, an acceleration pipe is fixedly connected to the top of the intake pipe, and one end of the acceleration pipe is fixedly connected to the cold air end of the vortex pipe by a snap fastener.

[0009] Furthermore, a fixed plate is fixedly connected to the top port of the air intake pipe, and a contact rod is fixedly connected to the top of the fixed plate by a spring. A blocking plate is fixedly connected to the bottom of the contact rod. The blocking plate is located at the bottom of the fixed plate and is used to block or open the middle position of the fixed plate.

[0010] Furthermore, a cavity ring is fixedly connected to the rear side wall of the rear housing, the air inlet pipe passes through the cavity ring and extends into the cavity ring, and multiple vent pipes are fixedly connected to one side wall of the cavity ring.

[0011] Furthermore, a piston rod slides through the rear side of the rear housing, the piston cover of the piston rod is slidably installed inside the vent pipe, and one end of the piston rod extends outward and is fixedly connected to an arc-shaped frame.

[0012] Furthermore, there are two arc-shaped frames, which are semi-circular. One arc-shaped frame is connected to the piston rod located in the upper half of the cavity ring, and the other arc-shaped frame is connected to the piston rod located in the lower half of the cavity ring.

[0013] Furthermore, an overpressure shut-off valve is installed in the middle of both the exhaust pipe and the intake pipe, and a connecting pipe is fixedly connected through both the intake pipe and the exhaust pipe. A buffer assembly is connected between the two connecting pipes to help buffer the pressure generated by the deflagration.

[0014] Furthermore, the buffer assembly includes a buffer plate fixedly connected between the two connecting pipes, the buffer plate having multiple Tesla valve channels, an elastic bladder fixedly connected to the middle of the buffer plate, the two ends of the Tesla valve channels communicating with the connecting pipes and the elastic bladder respectively, and an external blowing solid whistle fixedly installed through the bottom of the elastic bladder.

[0015] Furthermore, a heat dissipation assembly is connected between the high-pressure air pump and the top of the air outlet pipe. A finned tube is fixedly connected to the hot air end of the vortex tube, and the other end of the finned tube is fixedly connected to one end of the heat dissipation assembly. The heat dissipation assembly is used to cool the hot air flow in the air outlet pipe and the finned tube.

[0016] Furthermore, the heat dissipation assembly includes a heat dissipation pipe connected between the air inlet end of the high-pressure air pump and the top end of the air outlet pipe. A top cover is fixedly connected to the top of the heat dissipation pipe. A water flow chamber is opened inside the top cover. Multiple atomizing nozzles are installed through the bottom of the top cover and are connected to the top cover. A water inlet pipe is fixedly installed through the top of the top cover and the bottom end of the water inlet pipe extends into the water flow chamber.

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0018] This invention employs a circulating cooling assembly, utilizing the characteristics of vortex tubes to separate cold and hot airflows. It uses low-temperature gas to circulate and cool the inside of the motor housing, achieving a better cooling effect. Furthermore, it forms a closed external circulation around the motor housing, reducing the possibility of external debris entering the motor and, to some extent, reducing the frequency of deflagration. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a half-sectional view of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a half-sectional view of the air intake pipe of the present invention;

[0024] Figure 5 This is a half-sectional view of the heat dissipation component of the present invention;

[0025] Figure 6 This is a top half-sectional view of the buffer plate of the present invention;

[0026] Figure 7 This is a schematic diagram of the airflow direction of the circulating cooling component of the present invention.

[0027] The labels in the diagram represent: 1. Motor housing; 2. Rear housing; 3. Circulating cooling assembly; 301. High-pressure air pump; 302. Acceleration pipe; 303. Inlet pipe; 304. Outlet pipe; 305. Flow channel; 306. Connecting pipe; 307. Contact rod; 308. Fixed plate; 309. Blocking plate; 310. Vent pipe; 311. Piston rod; 312. Arc frame; 313. Vortex tube; 314. Finned tube; 315. Cavity ring; 4. Heat dissipation assembly; 401. Water inlet pipe; 402. Heat dissipation pipe; 403. Top cover; 404. Water flow chamber; 405. Atomizing nozzle; 5. Buffer assembly; 501. Buffer plate; 502. Tesla valve channel; 503. Elastic bladder; 504. External blow solid whistle; 6. Overpressure shut-off valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] The present invention will be further described below with reference to embodiments.

[0030] Example: An explosion-proof high-voltage three-phase asynchronous motor includes a motor housing 1 and a rear housing 2. The motor housing 1 is equipped with a stator, stator windings, a rotor and rotor windings. The rear housing 2 is equipped with a blower blade. The motor housing 2 is also fixedly installed on the rear side of the motor housing 1. A circulating cooling assembly 3 is used to cool the motor housing 1.

[0031] The circulating cooling assembly 3 includes a high-pressure air pump 301 and a vortex tube 313. The high-pressure air pump 301 provides air pressure, and the vortex tube 313 splits the high-pressure gas into a hot air stream and a cold air stream. An exhaust pipe 304 is vertically and fixedly installed near the end cover of the motor housing 1. An intake pipe 303 is vertically and installed on the rear housing 2. The top of the intake pipe 303 is connected to the cold air end of the vortex tube 313, and the top of the exhaust pipe 304 is connected to the intake end of the high-pressure air pump 301. The exhaust end of the high-pressure air pump 301 is connected to the intake end of the vortex tube 313.

[0032] An acceleration pipe 302 is fixedly connected to the top of the intake pipe 303. One end of the acceleration pipe 302 is fixedly connected to the cold air end of the vortex pipe 313 by a snap fastener.

[0033] During rotor operation within the motor housing 1, the fan blades connected to the rotor also rotate. This rotation generates airflow into the motor housing 1. The high-pressure air pump 301 generates approximately 5-7 bar of air pressure, which is then divided into cold and hot air streams by the vortex tube 313. The cold air stream enters the rear housing 2 through the inlet pipe 303 and is then drawn into the motor housing 1 by the rotation of the fan blades, dissipating heat from the stator and rotor windings within the motor housing 1. After passing through the stator and rotor windings, the cold air carries away the heat and flows upwards through the outlet pipe 304. Simultaneously, the airflow is drawn out of the motor housing 1 by the suction end of the high-pressure air pump 301. It is then pressurized by the high-pressure air pump 301 and re-diverted through the vortex tube 313, further dissipating heat from the stator and rotor windings within the motor housing 1. The relatively enclosed space formed between the side housing 2, the air inlet pipe 303, and the air outlet pipe 304 allows the fan blades to stably blow air, providing better heat dissipation for the two windings inside the motor housing 1. Combined with a vortex tube 313 that generates cool airflow (selected with a cool air ratio of approximately 70%-80%), the air pressure generated at the cool air end of the vortex tube 313 is also circulated by the cooling component 3 and the buffer component 5 bar. Through the transmission of air pressure, the airflow is stably input into the motor housing 1. Simultaneously, this arrangement reduces the entry of external dust and other impurities into the motor housing 1 or the rear side housing 2. This allows the fan blades in the rear side housing 2 to blow air into the motor housing 1, instead of blowing air outwards to cool the windings inside the motor housing 1, thus improving heat dissipation while ensuring a certain level of safety.

[0034] A fixed plate 308 is fixedly connected inside the top port of the intake pipe 303. A contact rod 307 is fixedly connected to the top of the fixed plate 308 by a spring. A blocking plate 309 is fixedly connected to the bottom of the contact rod 307. The blocking plate 309 is located at the bottom of the fixed plate 308 and is used to block or open the middle position of the fixed plate 308.

[0035] When connecting the acceleration pipe 302 and the vortex tube 313, a hose clamp or a retaining clamp is used for connection. Before the motor runs, the motor housing 1 and the rear housing 2 need to be filled with protective gas. Then, open the hose clamp or retaining clamp and seal the connection between the intake pipe 303 and the acceleration pipe 302, so that the cold air end of the vortex tube 313 is opened. At the same time, connect the external air source pipe to the top of the intake pipe 303. The air pressure can push the blocking disc 309 downward, so that the blocking disc 309 and the fixed disc 308 are separated. In this way, the external protective gas source can enter the intake pipe 303, and the high pressure is turned on. Air pump 301 draws gas from inside motor housing 1 through outlet pipe 304. After multiple fillings, other gases inside motor housing 1 and rear housing 2 are squeezed out, filling motor housing 1 and rear housing 2 with protective gas. Then, acceleration pipe 302 and intake pipe 303 are connected. After high-pressure air pump 301 is running, a relatively closed circulating cold air flow is formed between motor housing 1, rear housing 2, intake pipe 303, outlet pipe 304 and high-pressure air pump 301, which can better cool the electronic components inside motor housing 1.

[0036] Nitrogen can be used as the protective gas. Nitrogen is relatively inexpensive. After the motor housing 1 and the rear housing 2 are filled with protective gas, it is difficult for combustion or explosion to occur inside the motor housing 1 and the rear housing 2. Even if combustion occurs, it will be quickly extinguished due to lack of oxygen.

[0037] A cavity ring 315 is fixedly connected to the rear side wall of the rear housing 2. An air inlet pipe 303 passes through the cavity ring 315 and extends into the cavity ring 315. Multiple vent pipes 310 are fixedly connected to one side wall of the cavity ring 315.

[0038] The gas flowing through the intake pipe 303 passes through the cavity ring 315, and then blows out cooling air evenly into the motor housing 1 and the rear housing 2 through multiple exhaust pipes 310, which can produce a more uniform cooling effect.

[0039] A piston rod 311 slides through the rear side of the rear housing 2. The piston cover of the piston rod 311 is slidably installed in the vent pipe 310. One end of the piston rod 311 extends outward and is fixedly connected to an arc-shaped frame 312. There are two arc-shaped frames 312, which are semi-circular. One arc-shaped frame 312 is connected to the piston rod 311 located in the upper half of the cavity ring 315, and the other arc-shaped frame 312 is connected to the piston rod 311 located in the lower half of the cavity ring 315.

[0040] During the process of filling the motor housing 1 and the rear housing 2 with protective gas, the lower arc-shaped frame 312 can be pulled outward first. The piston rod 311 in the lower half loses its blocking effect on the vent pipe 310. In this way, the cooling airflow flowing through the intake pipe 303 can first flow out from below the cavity ring 315, and then be sucked out by the high-pressure air pump 301 from the upper outlet pipe 304. This makes the intake and outlet positions diagonally distributed during the filling of protective gas, which can better complete the filling process of protective gas. After the protective gas is filled, both arc-shaped frames 312 need to be pulled outward to open the upper vent pipe 310, allowing the cooling airflow to flow out from the vent pipe 310.

[0041] Before each operation, it is best to perform a process of filling with protective gas to ensure that there is enough protective gas in the motor housing 1 and the rear housing 2. The process of opening the lower half of the vent pipe 310 first and then opening the upper half of the vent pipe 310 allows the cooling airflow to fill the cavity ring 315 and flow downward. After the upper half of the vent pipe 310 is opened, the air pressure discharged from all the vent pipes 310 can be more uniform.

[0042] An overpressure shut-off valve 6 is installed in the middle of both the exhaust pipe 304 and the intake pipe 303. A connecting pipe 306 is fixedly connected through the intake pipe 303 and the exhaust pipe 304. A buffer assembly 5 is connected between the two connecting pipes 306. The buffer assembly 5 is used to help buffer the pressure generated by the deflagration. The buffer assembly 5 includes a buffer plate 501 fixedly connected between the two connecting pipes 306. Multiple Tesla valve channels 502 are opened in the buffer plate 501. An elastic bladder 503 is fixedly connected in the middle of the buffer plate 501. The two ends of the Tesla valve channel 502 are respectively connected to the connecting pipe 306 and the elastic bladder 503. An external blowing solid whistle 504 is fixedly installed through the bottom of the elastic bladder 503.

[0043] In the event of combustion occurring within the motor housing 1 and the rear housing 2, the gas pressure within these two housings will rapidly increase. At this point, the overpressure shut-off valve 6 will block the connection between the motor housing 1 and the rear housing 2 and the outlet pipe 304 and inlet pipe 303, thus disconnecting the high-pressure air pump 301 from the space within the motor housing 1. This allows the high-pressure gas generated by combustion to enter the Tesla valve channel 502 of the buffer plate 501 through the connecting pipe 306. As the gas flows through the Tesla valve channel 502, the pressure gradually weakens within it due to the continuous backflow and impact with the incoming airflow, eventually entering the elastic bladder 503. When the pressure is sufficiently high, the external solid whistle 504 will be blown, serving as a warning of a deflagration.

[0044] A heat dissipation assembly 4 is also connected between the top end of the high-pressure air pump 301 and the top end of the air outlet pipe 304. The hot air end of the vortex tube 313 is fixedly connected to the finned tube 314. The other end of the finned tube 314 is fixedly connected to one end of the heat dissipation assembly 4. The heat dissipation assembly 4 is used to cool the hot air flow in the air outlet pipe 304 and the finned tube 314. The heat dissipation assembly 4 includes a heat dissipation pipe 402 connected between the air inlet end of the high-pressure air pump 301 and the top end of the air outlet pipe 304. A top cover 403 is fixedly connected to the top of the heat dissipation pipe 402. A water flow chamber 404 is opened in the top cover 403. Multiple atomizing nozzles 405 are installed through the bottom of the top cover 403 and are connected to the top cover 403. A water inlet pipe 401 is fixedly installed through the top of the top cover 403 and the bottom end of the water inlet pipe 401 extends into the water flow chamber 404.

[0045] Since the vortex tube 313 also generates hot air, in order to ensure that the protective gas inside the motor housing 1 and the rear housing 2 does not leak out, and also to lower the temperature of the cooling gas generated by the vortex tube 313, the hot air from the vortex tube 313 also needs to be cooled along with the gas in the outlet pipe 304. The hot air flowing out of the vortex tube 313 will exchange heat with the outside air and cool down as it passes through the finned tube 314. After flowing into the heat dissipation pipe 402 together with the gas in the outlet pipe 304, the hot air will dissipate heat in the heat dissipation pipe 402. Under the action of the atomized liquid generated by the atomizing nozzle 405, the heat dissipation pipe 402 and the heat dissipation fins outside the heat dissipation pipe 402 will be cooled, thus helping to reduce the temperature of the hot air. In this way, the temperature of the gas entering the inlet end of the vortex tube 313 is lower, and the temperature of the cold air flowing out of the cold air end of the vortex tube 313 is also lower.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame-proof high-voltage three-phase asynchronous motor comprising a motor housing and a rear housing, a stator, a stator winding, a rotor and a rotor winding being installed in the motor housing, a fan blade for blowing air being installed in the rear housing, characterized in that, Also includes: The rear housing is fixedly installed on the rear side of the motor housing, and the circulating cooling assembly is used to cool the inside of the motor housing. The circulating cooling assembly includes a high-pressure air pump and a vortex tube. The high-pressure air pump provides air pressure, and the vortex tube splits the high-pressure gas into a hot air stream and a cold air stream. An exhaust pipe is vertically and fixedly installed near the end cover of the motor housing, and an intake pipe is vertically and fixedly installed on the rear housing. The top of the intake pipe is connected to the cold air end of the vortex tube, the top of the exhaust pipe is connected to the intake end of the high-pressure air pump, and the exhaust end of the high-pressure air pump is connected to the intake end of the vortex tube. An acceleration pipe is fixedly connected to the top of the intake pipe, and one end of the acceleration pipe is fixedly connected to the cold air end of the vortex pipe by a snap fastener. Both the outlet pipe and the inlet pipe are equipped with overpressure shut-off valves in the middle. Both the inlet pipe and the outlet pipe are connected by connecting pipes. A buffer assembly is connected between the two connecting pipes. The buffer assembly is used to help buffer the pressure generated by the deflagration. The buffer assembly includes a buffer plate fixedly connected between the two connecting pipes. The buffer plate has multiple Tesla valve channels. An elastic bladder is fixedly connected to the middle of the buffer plate. The two ends of the Tesla valve channels are respectively connected to the connecting pipes and the elastic bladder. An external blowing solid whistle is fixedly installed through the bottom of the elastic bladder. A heat dissipation assembly is also connected between the high-pressure air pump and the top of the air outlet pipe. A finned tube is fixedly connected to the hot air end of the vortex tube, and the other end of the finned tube is fixedly connected to one end of the heat dissipation assembly. The heat dissipation assembly is used to cool the hot air flow in the air outlet pipe and the finned tube.

2. The explosion-proof high-voltage three-phase asynchronous motor according to claim 1, characterized in that, A fixed plate is fixedly connected to the top port of the air intake pipe. A contact rod is fixedly connected to the top of the fixed plate by a spring. A blocking plate is fixedly connected to the bottom of the contact rod. The blocking plate is located at the bottom of the fixed plate and is used to block or open the middle position of the fixed plate.

3. The explosion-proof high-voltage three-phase asynchronous motor according to claim 2, characterized in that, A cavity ring is fixedly connected to the rear side wall of the rear housing. The air intake pipe passes through the cavity ring and extends into the cavity ring. Multiple vent pipes are fixedly connected to one side wall of the cavity ring.

4. The explosion-proof high-voltage three-phase asynchronous motor according to claim 3, characterized in that, A piston rod slides through the rear side of the rear housing, and the piston cover of the piston rod is slidably installed inside the vent pipe. One end of the piston rod extends outward and is fixedly connected to an arc-shaped frame.

5. The explosion-proof high-voltage three-phase asynchronous motor according to claim 4, characterized in that, There are two semi-circular arc-shaped frames, one of which connects to the piston rod located in the upper half of the cavity ring, and the other arc-shaped frame connects to the piston rod located in the lower half of the cavity ring.

6. The explosion-proof high-voltage three-phase asynchronous motor according to claim 1, characterized in that, The heat dissipation assembly includes a heat dissipation pipe connected between the air inlet end of the high-pressure air pump and the top end of the air outlet pipe. A top cover is fixedly connected to the top of the heat dissipation pipe. A water flow chamber is opened inside the top cover. Multiple atomizing nozzles are installed through the bottom of the top cover and are connected to the top cover. A water inlet pipe is fixedly installed through the top of the top cover and the bottom end of the water inlet pipe extends into the water flow chamber.

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