Dehumidification and moisture-proof structure of air-water cooler motor

Abstract

The invention belongs to the technical field of air-water cooler motors, and relates to a dehumidification and moisture-proof structure of an air-water cooler motor. The interior of the structure cavity (1) is in a negative pressure state when the air-water cooler motor works, a cooler (19) is arranged in the cooler cavity (2), a cooler water collecting groove (4) is formed in the lower portion of the cooler cavity (2), a water accumulating tank (5) is arranged at the lowest position outside the motor cavity (3), and the water collecting groove (4) and the water accumulating tank (5) are communicated through a conveying pipeline (6). And a one-way valve (7) is arranged at one end, penetrating through the structural cavity (1) and extending into the water accumulation tank (5), of the conveying pipeline (6). According to the air-water cooler motor dehumidification and moisture-proof structure, the sealing condition of the motor and the air humidity in the motor cavity can be monitored in real time, dehumidification is effectively conducted according to different running and shutdown states of the motor, it is guaranteed that the dryness in the motor is improved, the moisture-proof effect is improved, and the influence on motor insulation is avoided; and the motor operation reliability in a humid environment is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air-water cooler motors, and more specifically, relates to a dehumidification and moisture-proof structure of an air-water cooler motor. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic conversion. The main function of a motor is to generate driving torque as a power source for electrical appliances or various machines. The cooling method for large motors is usually to pass closed-circuit circulating water through a backpack-type air-water cooler on the top of the motor and force air cooling by a circulating fan. The shell of the air-water cooler is a rectangular box welded by steel plates. The bottom has a cooler circulating fan air inlet connected to the top air outlet on the non-drive side of the motor, and a cooler air outlet connected to the top air inlet on the drive side of the motor. The circulating fan is a centrifugal fan. The motor is fixed on the outer wall of the cooler and sealed and isolated from the inside of the cooler. It is used to extract the hot air inside the motor and pressurize it to the built-in plate cooler in the middle of the cooler. The cooling core is arranged with fin cooling pipes, and circulating cooling water is passed through the pipes. After the hot air passes through the cooling core, it becomes low-temperature air. The low-temperature air comes out of the cooler and enters the motor from the top air inlet on the drive side of the motor, so that the hot and cold air are closed and circulated, and the motor is cooled. The inlet and outlet of this motor cooler are docked and assembled with the outlet and inlet of the motor. In order to meet the heat exchange performance, the core height of the cooler is relatively high and the overall volume of the cooler is large. In the relatively sealed space formed by the air-water cooler and the motor, negative pressure will be formed locally after the centrifugal fan is running. During the production process, the motor windings heat up and the air temperature inside the motor is relatively high. When the machine is shut down, the air inside the motor cools down, which will also aggravate the negative pressure. Once there is an abnormality in the seal of the motor output shaft, the junction box, the end covers on both sides, and the joint between the cooler and the motor, the moist air from the outside will enter the motor under negative pressure. The hot and humid air is sucked in by the fan and blown to the cooler, condensing into water droplets. When the water collection tank under the cooler is full, it will overflow and flow into the motor to destroy the insulation of the motor and cause damage to the motor. In the production process of metallurgical hot rolling enterprises, a large number of motor drive devices are used, and many of them are used in harsh environments. For example, the pressure adjustment motor of the steel rolling mill is located below the rolling mill. A large amount of open circuit water is needed to cool the rollers during the rolling process, and high-temperature water vapor is diffused during the rolling process.

[0003] Announcement No. CN109900433B: A detection and alarm device for water leakage in air-water coolers of large synchronous motors. The benefit of this invention is that a water leakage visualization observation system is added to the original water leakage alarm system, and the water leakage visualization observation system whose gas-liquid input end is connected to the bottom of the water collection tank is arranged on the outside of the casing of the large synchronous motor. Since the gas-liquid input end of the water leakage visualization observation system is connected to the bottom of the water collection tank, when there is water leakage entering the water collection tank, it can be connected to enter the water leakage visualization observation system, so that the trace amount of cooling water leaked by the air-water cooler can also be input into the water leakage visualization observation system through the water collection tank, so that when the amount of water leakage has not reached the existing alarm condition, it is still possible to judge whether the cooler is leaking by observing whether there is water in the water leakage visualization observation system. Even if a small amount of water leakage is vaporized by high temperature, since the water leakage visualization observation system is connected to the inside of the synchronous motor, some water vapor will enter the water leakage visualization observation system outside the casing and condense at room temperature, which can also be observed.

[0004] Announcement No. CN210269054U: A water leakage protection device for air-water coolers. Compared with the existing technology, the utility model has a positive and obvious effect. The utility model is arranged outside the air-water cooler shell, connected to the air-water cooler shell through a water inlet pipe, and does not occupy the space inside the air-water cooler shell. The float liquid level switch is installed on the connecting piece through a threaded connection, which is convenient for replacement and maintenance. The float liquid level switch has a fast response speed and a long service life.

[0005] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a simple structure is provided, which can monitor the sealing condition of the motor and the air humidity inside the motor cavity in a humid environment in real time, promptly alarm and remind of abnormal conditions, and effectively dehumidify according to the different running and shutdown states of the motor, thereby ensuring that the internal dryness of the motor is improved, the moisture-proof effect is improved, the influence on the motor insulation is avoided, and the reliability of the motor operation in a humid environment is improved.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0008] The present invention discloses a dehumidification and moisture-proof structure for an air-to-water cooler motor. The structural cavity comprises a cooler cavity and a motor cavity. The interior of the structural cavity is in a negative pressure state when the air-to-water cooler motor is working. A cooler is arranged inside the cooler cavity. The lower part of the cooler cavity is a cooler water collection tank. A water accumulation tank is arranged at the lowest position outside the motor cavity. The water collection tank and the water accumulation tank are connected through a conveying pipeline. A one-way valve is arranged at one end of the conveying pipeline extending through the structural cavity to the interior of the water accumulation tank. An overflow hole is arranged on the water accumulation tank near the upper position.

[0009] A motor cavity pressure sensor, a motor cavity temperature sensor and a motor cavity humidity sensor are arranged inside the motor cavity, and the motor cavity pressure sensor, the motor cavity temperature sensor and the motor cavity humidity sensor are connected to control the motor PLC.

[0010] An air inlet and an air outlet are arranged between the cooler cavity and the motor cavity. The air outlet is located inside the cooler cavity. A cooler centrifugal fan is arranged. The cooler centrifugal fan is connected to the cooler centrifugal fan motor. The cooler centrifugal fan motor is fixedly connected to the structural cavity.

[0011] A heater is arranged at the air inlet position of the motor cavity.

[0012] A sealing ring is arranged between the conveying pipeline and the structural cavity.

[0013] When the air-water cooler motor stops running, after the motor cavity humidity sensor detects that the actual humidity value in the motor cavity is higher than the set humidity value, the motor PLC is set to a structure that can control the heater to start; after the motor cavity humidity sensor detects that the actual humidity value in the motor cavity is lower than the set humidity value, the motor PLC is set to a structure that can control the heater to stop.

[0014] When the air-water cooler motor stops running, after the motor cavity temperature sensor detects that the actual temperature value in the motor cavity is lower than the set first-level temperature value, the motor PLC is set to a structure that can control the two heaters to work simultaneously; after the motor cavity temperature sensor detects that the actual temperature value in the motor cavity is higher than the set second-level temperature value, the motor PLC is set to a structure that can control one heater to stop heating and the other heater to continue heating.

[0015] After the motor cavity temperature sensor detects that the actual temperature value in the motor cavity is higher than the set third-level temperature value, the motor PLC is set to a structure that enables the heater to stop heating; the first-level temperature value < the second-level temperature value < the third-level temperature value.

[0016] When the motor cavity pressure sensor detects that the actual pressure value in the motor cavity is greater than the set pressure value, it indicates that the air-water cooler motor seal is abnormal, and the motor PLC is set to a structure that can control the alarm to sound.

[0017] The water storage tank is a structure made of transparent material, the delivery pipeline is a silicone hose, and the one-way valve is a membrane-flap type one-way valve.

[0018] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0019] The dehumidification and moisture-proof structure of the air-to-water cooler motor described in the present invention has a structural cavity including a cooler cavity and a motor cavity. The interior of the structural cavity is in a negative pressure state when the air-to-water cooler motor is working. A cooler is arranged inside the cooler cavity. When the cooler is working, it is used for cooling and generates cold air. The cold air is sent into the motor cavity from the air inlet, and the hot air after heat exchange flows out of the motor cavity from the air outlet to be cooled again, and the cycle repeats. In order to solve the dehumidification and moisture-proof problem when the air-to-water cooler motor is working, based on the cooler water collection tank at the lower part of the cooler cavity, a water storage tank is arranged at the lowest position outside the motor cavity, the water collection tank and the water storage tank are connected by a conveying pipeline, and a one-way valve is arranged at one end of the conveying pipeline extending through the structural cavity to the inside of the water storage tank, and an overflow hole is arranged on the water storage tank near the upper position. In this way, during the operation of the air-water cooler motor, when the high-temperature and humid air at the motor working site enters the motor through the gap of the motor, it will be mixed with the air heated by the motor windings, and then it will be sucked into the centrifugal fan and blown to the cooler, and condensed on the surface of the cooler to form water droplets that fall into the water collection tank. The water in the water collection tank enters the delivery pipeline and gathers in the delivery pipeline. When the gathered water reaches a certain amount, the gravity of the water is greater than the negative pressure generated by the centrifugal fan, which will push the one-way valve 7 to open, so that the water enters the water storage tank. When the amount of accumulated water is small, the gravity of the water is not enough to offset the negative pressure generated by the centrifugal fan, and the one-way valve automatically closes, and so on. The timely closure of the one-way valve 7 can effectively prevent external humid air from entering the motor cavity through the one-way valve. In this way, on the one hand, it can ensure that the accumulated water is removed in time to avoid affecting the internal humidity inside the structural cavity. On the other hand, the sealing status inside the structural cavity can be grasped in time through the water tank: if there is no water or less water in the water tank, it means that the internal sealing status of the motor is good. If there is more water in the water tank, it means that the internal sealing status of the motor is poor, and the motor needs to be inspected and maintained. The overflow hole is set, because the inspection of the motor is not carried out at any time, but regularly or irregularly. If the seal is damaged and the amount of water is large, the water in the water tank is full and cannot overflow, and the one-way valve is in the open state at this time, the water will flow back to the inside of the structural cavity through the conveying pipeline. The overflow valve is set. When the water level in the water tank reaches a certain height, it overflows through the overflow hole to avoid the above problems. When the motor stops running, the motor winding no longer heats up at this time, and the cold air blown by the fan through the cooler will reduce the temperature in the motor cavity to basically the same as the cold air temperature, which basically loses the condensation effect of the cooler. At this time, the humid air from the outside may still enter the motor. During the continuous invasion, the relative humidity inside the motor rises rapidly, and the moisture will adhere to the surface of the internal electrical components, reducing the insulation. Therefore, the motor in the shutdown state also needs to be monitored and dehumidified. To this end, the heater is controlled to start and stop according to the information obtained by the sensor. After the heater is started, the air sent in from the air inlet can be heated, and the hot air blows through the motor cavity, taking away the humid air in the motor cavity, and then sent to the cooler from the air outlet for condensation, and discharged from the water tank.In this way, even if the motor is in a stopped state, dehumidification and moisture prevention can be effectively achieved to protect the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents and symbols in the drawings of this specification:

[0021] Figure 1 It is a structural schematic diagram of the dehumidification and moisture-proof structure of the air-water cooler motor of the present invention;

[0022] Figure 2 It is a schematic diagram of the arrangement structure of the heater of the air-water cooler motor dehumidification and moisture-proof structure of the present invention;

[0023] Figure 3 It is a comparison table of ambient temperature, relative humidity and dew point;

[0024] The marks in the accompanying drawings are respectively: 1. structural cavity; 2. cooler cavity; 3. motor cavity; 4. cooler sump; 5. water storage tank; 6. delivery pipeline; 7. one-way valve; 8. overflow hole; 9. motor cavity pressure sensor; 10. motor cavity temperature sensor; 11. motor cavity humidity sensor; 12. motor PLC (control motor PLC); 13. heater; 14. air inlet; 15. air outlet; 16. cooler centrifugal fan; 17. cooler centrifugal fan motor; 18. sealing ring; 19. cooler; 20. alarm; 21. motor output shaft. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0026] As attached Figure 1 , Attachment Figure 2As shown, the present invention is an air-water cooler motor dehumidification and moisture-proof structure, the structural cavity 1 includes a cooler cavity 2 and a motor cavity 3, the interior of the structural cavity 1 is in a negative pressure state, a cooler 19 is arranged inside the cooler cavity 2, the lower part of the cooler cavity 2 is a cooler water collection tank 4, a water storage tank 5 is arranged at the lowest position outside the motor cavity 3, the water collection tank 4 and the water storage tank 5 are connected through a delivery pipeline 6, the delivery pipeline 6 passes through the structural cavity 1 and extends to one end of the water storage tank 5, and a one-way valve 7 is arranged, and an overflow hole 8 is arranged near the upper position on the water storage tank 5. The above structure proposes an improved technical solution to the deficiencies in the prior art. When the structure is set, the structural cavity 1 includes a cooler cavity 2 and a motor cavity 3. The interior of the structural cavity 1 is in a negative pressure state when the air-water cooler motor is working. A cooler 19 is set inside the cooler cavity 2. When the cooler is working, it is used for cooling and generates cold air. The cold air is sent into the motor cavity from the air inlet, and the hot air after heat exchange flows out of the motor cavity from the air outlet to cool again, and the cycle repeats. In order to solve the dehumidification and moisture-proof problem when the air-water cooler motor is working, based on the cooler water collection tank 4 at the lower part of the cooler cavity 2, a water storage tank 5 is set at the lowest position outside the motor cavity 3. The water collection tank 4 and the water storage tank 5 are connected by a conveying pipeline 6. The conveying pipeline 6 passes through the structural cavity 1 and extends to the end of the water storage tank 5. A one-way valve 7 is set, and an overflow hole 8 is set on the water storage tank 5 near the upper position. In this way, during the operation of the air-water cooler motor, when the high-temperature humid air at the motor working site enters the motor through the gap of the motor, it will be mixed with the air heated by the motor winding, and then it will be sucked into the centrifugal fan and blown to the cooler 19, and condensed on the surface of the cooler to form water droplets that fall into the water collection tank 4. The water in the water collection tank 4 enters the delivery pipeline 6 and gathers in the delivery pipeline 6. When the accumulated water reaches a certain amount, the gravity of the water is greater than the negative pressure generated by the centrifugal fan, which will push the one-way valve 7 to open, so that the water enters the water storage tank 5 for storage. When the amount of accumulated water is small, the gravity of the water is not enough to offset the negative pressure generated by the centrifugal fan, and the one-way valve 7 automatically closes, and so on. The timely closure of the one-way valve 7 can effectively prevent external humid air from entering the motor cavity through the one-way valve 7. In this way, on the one hand, it can ensure that the accumulated water is removed in time to avoid accumulation inside the structural cavity 1 and affecting the internal humidity. On the other hand, the sealing state inside the structural cavity 1 can be timely grasped through the water tank 5: if there is no water or less water in the water tank, it means that the internal sealing state of the motor is good. If there is more water in the water tank, it means that the internal sealing state of the motor is poor, and the motor needs to be inspected and maintained. The overflow hole 8 is set because the inspection of the motor is not carried out at any time, but regularly or irregularly. If the seal is damaged and the amount of water is large, the water in the water tank is full and cannot overflow, and the one-way valve is in an open state at this time, the water will flow back to the inside of the structural cavity through the delivery pipeline. An overflow valve is set. When the water level in the water tank reaches a certain height, it overflows through the overflow hole to avoid the above problems.The air-to-water cooler motor dehumidification and moisture-proof structure described in the present invention has a simple structure, can monitor the sealing condition of the motor and the air humidity inside the motor cavity in real time in a humid environment, and promptly alarm for abnormal conditions. It can effectively dehumidify according to the different running and shutdown states of the motor, thereby ensuring that the internal dryness of the motor is improved, improving the moisture-proof effect, avoiding the impact on the motor insulation, and improving the reliability of the motor operation in a humid environment.

[0027] The motor cavity 3 is provided with a motor cavity pressure sensor 9, a motor cavity temperature sensor 10 and a motor cavity humidity sensor 11, and the motor cavity pressure sensor 9, the motor cavity temperature sensor 10 and the motor cavity humidity sensor 11 are connected to the motor PLC 12. The above structure, the motor cavity pressure sensor 9, the motor cavity temperature sensor 10 and the motor cavity humidity sensor 11 are connected to the motor PLC 12, and are used to obtain real-time data of pressure, temperature and humidity inside the motor cavity in real time, so as to facilitate interference adjustment according to different data states.

[0028] An air inlet 14 and an air outlet 15 are arranged between the cooler cavity 2 and the motor cavity 3. The air outlet 15 is located inside the cooler cavity 2. A cooler centrifugal fan 16 is arranged. The cooler centrifugal fan 16 is connected to a cooler centrifugal fan motor 17. The cooler centrifugal fan motor 17 is fixedly connected to the structural cavity 1. In the above structure, the cooler centrifugal fan motor 17 is used to drive the cooler centrifugal fan 16 to rotate, generate air volume, and the air volume is cooled by the cooler and then enters the motor cavity. In this way, the cooling of the motor can be reliably achieved through the cooler and other components.

[0029] A sealing ring 18 is provided between the delivery pipeline 6 and the structural cavity 1. In the above structure, the sealing ring is used to achieve sealing between the delivery pipeline 6 and the structural cavity 1 to prevent external humid air from entering the motor cavity through the gap between the delivery pipeline 6 and the structural cavity 1.

[0030] A heater 13 is arranged at the air inlet 14 of the motor cavity 3. When the air-water cooler motor stops running, after the motor cavity humidity sensor 11 detects that the actual humidity value in the motor cavity 3 is higher than the set humidity value, the motor PLC 12 is arranged to be a structure capable of controlling the heater 13 to start; after the motor cavity humidity sensor 11 detects that the actual humidity value in the motor cavity 3 is lower than the set humidity value, the motor PLC 12 is arranged to be a structure capable of controlling the heater 13 to stop. When the air-water cooler motor stops running, after the motor cavity temperature sensor 11 detects that the actual temperature value in the motor cavity 3 is lower than the set first-gear temperature value, the motor PLC 12 is arranged to be a structure capable of controlling two heaters 13 to work simultaneously; after the motor cavity temperature sensor 11 detects that the actual temperature value in the motor cavity 3 is higher than the set second-gear temperature value, the motor PLC 12 is arranged to be a structure capable of controlling one heater 13 to stop heating and the other heater 13 to continue heating. After the motor cavity temperature sensor 10 detects that the actual temperature value in the motor cavity 3 is higher than the set third-gear temperature value, the motor PLC 12 is set to a structure that can stop the heater 13 from heating; the first-gear temperature value < the second-gear temperature value < the third-gear temperature value. In the above structure, when the motor stops running, the motor winding no longer heats up, and the cold wind blown by the fan through the cooler will cause the temperature in the motor cavity to drop to a temperature basically consistent with the cold wind temperature, which basically loses the condensation effect of the cooler. At this time, the humid air from the outside may still enter the motor. During the continuous invasion process, the relative humidity inside the motor rises rapidly, and the moisture will adhere to the surface of the internal electrical components, reducing the insulation. Therefore, the motor in the shutdown state also needs to be monitored and dehumidified and moisture-proof. To this end, according to the information obtained by the sensor, the start and stop of the heater is controlled. After the heater is started, the wind sent in from the air inlet can be heated, and the hot wind blows through the motor cavity, taking away the air with moisture in the motor cavity, and then sent to the cooler from the air outlet for condensation, and discharged from the water tank 8. In this way, even if the motor is in a shutdown state, dehumidification and moisture-proof can be effectively achieved to protect the motor.

[0031] When the motor cavity pressure sensor 9 detects that the actual pressure value in the motor cavity 3 is greater than the set pressure value when the motor cooling centrifugal fan is running, it indicates that the air-water cooler motor seal is abnormal, and the motor PLC 12 is set to a structure that can control the alarm 20 to alarm. In the above structure, when the seal is normal, when the centrifugal fan is running, a negative pressure will be generated inside, which is less than the ambient pressure. After the seal is damaged, the negative pressure will decrease, and the smaller it is, the closer it will be to the ambient pressure. In this way, when the pressure inside and outside the motor is abnormal, it indicates that the seal is abnormal, and an alarm will be sounded at this time to facilitate timely maintenance. Thereby avoiding damage caused by abnormal conditions.

[0032] The water tank 5 is made of transparent material, the delivery pipeline 6 is a silicone hose, and the one-way valve 7 is a diaphragm one-way valve. In the above structure, the water tank 5 is made of transparent material, which is convenient for real-time observation of whether there is water in the water tank to judge the sealing condition of the motor.

[0033] To further illustrate the technical solution of the present invention, a specific embodiment is described as follows:

[0034] In the structure of the present invention, if the air pressure value inside the motor cavity is greater than the set pressure value or equal to the ambient air pressure when the cooling fan is running, or the relative humidity of the air inside the motor cavity rises, it indicates that the motor seal is abnormal. During the operation of the motor, when the hot and humid air on site enters the motor through the gap, it will be sucked into the fan and blown to the cooler after mixing with the air heated by the motor winding. The cooling water inlet temperature is generally greater than 25°C in winter and ≤33°C in summer. The high temperature and humidity condense on the surface of the cooler and drip into the water collection tank. A one-way valve 7 is set at one end of the delivery pipeline 6 extending through the structural cavity 1 to the inside of the water storage tank 5. When water flows into the water collection tank into the delivery pipeline 6, the water level height can overcome the negative pressure generated by the cooling fan in the closed space. The accumulated water in the water collection tank will be automatically discharged through the one-way valve along the drain pipe. When the amount of water accumulated in the drain pipe is small, the gravity of the water is not enough to offset the negative pressure generated by the centrifugal fan. The one-way valve is closed in time to prevent external humid air from entering. The negative pressure generated by the cooling fan can be obtained by the following formula: Ap = (3600 × η1 × η2 × 1000 × N) / Q; (where Δp is the wind pressure, the unit is P a ; Q is the air flow rate, unit is m 3 / h; η1 is the fan efficiency, which can be 0.719 to 0.8, and 0.719 is taken here; η2 is the mechanical transmission efficiency, and the motor direct drive mode has a mechanical transmission efficiency of 1; N is the motor output shaft power, in kw); the air flow rate is obtained from the nameplate of the on-site air-water cooler, Q = 0.9m 3 / s, so the hourly wind flow is 3240m 3 / h; motor output shaft power 3KW; from the above formula, the theoretical negative pressure that the on-site fan can generate is 2396.7p a , 1p a =0.101972mmH2O, which can generate 244.40mmH2O negative pressure. Therefore, the vertical height of the silicone hose delivery pipeline at the drain outlet must be greater than 244.40mm, which can ensure that the water column pressure generated after the condensed water flows into the silicone hose can overcome the negative pressure and finally flow smoothly into the water tank. The opening pressure of the diaphragm-type one-way valve connected to the outlet side of the silicone hose is 0Mp a , reverse pressure 0.03Mp a , so that it can be reliably closed when there is no water in the cooler sump to be discharged.

[0035] After the motor stops running, the motor windings no longer generate heat, and the cold air blown by the fan through the cooler will cause the temperature inside the motor cavity to drop to a level basically consistent with the cold air temperature, which causes the condensation function of the cooler to fail to work. If the motor is not well sealed, humid air from the site will invade, and during the continuous invasion, the relative humidity inside the motor will rise rapidly, and the moisture will adhere to the surface of the internal electrical components, causing insulation degradation. Therefore, when the motor is shut down, as long as it is detected that the relative humidity in the motor cavity is higher than 70%, the PLC control program will issue a closing command, the contactor will close, and the two sets of insulated semiconductor heaters at the air inlet of the motor will be started. The cold air from the fan is heated, flows through the motor cavity, and takes away the moisture in the cavity to the cooler for condensation, and is discharged after the water is collected. Figure 3 From the data in the table, it can be seen that if the relative humidity in the motor cavity is to be kept below 75%, the temperature difference needs to be greater than 5°C to condense the moisture in the motor cavity in the cooler. The corresponding heater power selection calculation formula is as follows: Q x =cmΔt, where c is the specific heat capacity, and the specific heat capacity of air is 1.003×10 3 j / kg,℃; m is mass, where m=Qρ, Q is the air flow rate in an hour, according to the nameplate, we get 0.9×60×60=3240m 3 / h, ρ is air density, 1.29kg / m 3 , m = 4179.6 kg, Q x =20960694j, converted to w for Q x / 3600=5822w, two 3kw heaters are required. When the air temperature in the motor cavity is greater than 80°, one set of heaters is disconnected to prevent the temperature from continuing to rise and causing damage to the motor windings; if the humidity is less than 70%, one set of heaters is maintained in working state until the motor PLC issues a motor closing operation command; if the humidity is higher than 70% and the air temperature is less than 80°, the two sets of heaters are operated at the same time.

[0036] The dehumidification and moisture-proof structure of the air-to-water cooler motor described in the present invention, when the structure is set, the structural cavity 1 includes a cooler cavity 2 and a motor cavity 3. The interior of the structural cavity 1 is in a negative pressure state when the air-to-water cooler motor is working. A cooler 19 is arranged inside the cooler cavity 2. When the cooler is working, it is used for cooling to generate cold air. The cold air is sent into the motor cavity from the air inlet, and the hot air after heat exchange flows out of the motor cavity from the air outlet to be cooled again, and the cycle is repeated. In order to solve the dehumidification and moisture-proof problem when the air-to-water cooler motor is working, based on the cooler water collection tank 4 at the lower part of the cooler cavity 2, a water storage tank 5 is arranged at the lowest position outside the motor cavity 3, and the water collection tank 4 and the water storage tank 5 are connected by a conveying pipeline 6. A one-way valve 7 is arranged at one end of the conveying pipeline 6 extending through the structural cavity 1 to the interior of the water storage tank 5, and an overflow hole 8 is arranged on the water storage tank 5 near the upper position. In this way, during the operation of the air-water cooler motor, when the high-temperature humid air at the motor working site enters the motor through the gap of the motor, it will be sucked into the motor by the centrifugal fan after mixing with the air heated by the motor winding, blown to the cooler 19, and condensed on the surface of the cooler to form water droplets that fall into the water collection tank 4. The water in the water collection tank 4 enters the delivery pipeline 6 and gathers in the delivery pipeline 6. When the accumulated water reaches a certain amount, the gravity of the water is greater than the negative pressure generated by the centrifugal fan, which will push the one-way valve 7 to open, so that the water enters the water storage tank 5 for storage. When the amount of accumulated water is small, the gravity of the water is not enough to offset the negative pressure generated by the centrifugal fan, and the one-way valve 7 automatically closes, and so on. The timely closure of the one-way valve 7 can effectively prevent external humid air from entering the motor cavity through the one-way valve 7. In this way, on the one hand, it can ensure that the accumulated water is removed in time to avoid accumulation inside the structural cavity 1 and affecting the internal humidity. On the other hand, the sealing state inside the structural cavity 1 can be timely grasped through the water tank 5: if there is no water or less water in the water tank, it means that the internal sealing state of the motor is good. If there is more water in the water tank, it means that the internal sealing state of the motor is poor, and the motor needs to be inspected and maintained. The overflow hole 8 is set because the inspection of the motor is not carried out at any time, but regularly or irregularly. If the seal is damaged and the amount of water is large, the water in the water tank is full and cannot overflow, and the one-way valve is in an open state at this time, the water will flow back to the inside of the structural cavity through the delivery pipeline. An overflow valve is set. When the water level in the water tank reaches a certain height, it overflows through the overflow hole to avoid the above problems.

[0037] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A dehumidification and moisture-proof structure for an air-water cooler motor, characterized in that: The structural cavity (1) comprises a cooler cavity (2) and a motor cavity (3). The interior of the structural cavity (1) is in a negative pressure state when the air-water cooler motor is working. A cooler (19) is arranged inside the cooler cavity (2). The lower part of the cooler cavity (2) is a cooler water collecting tank (4). A water storage tank (5) is arranged at the lowest position outside the motor cavity (3). The water collecting tank (4) and the water storage tank (5) are connected through a conveying pipeline (6). A one-way valve (7) is arranged at one end of the conveying pipeline (6) extending through the structural cavity (1) to the interior of the water storage tank (5). An overflow hole (8) is arranged near the upper position of the water storage tank (5).

2. The air-water cooler motor dehumidification and moisture-proof structure according to claim 1 is characterized in that: A motor cavity pressure sensor (9), a motor cavity temperature sensor (10) and a motor cavity humidity sensor (11) are arranged inside the motor cavity (3); the motor cavity pressure sensor (9), the motor cavity temperature sensor (10) and the motor cavity humidity sensor (11) are connected to the motor PLC (12).

3. The air-water cooler motor dehumidification and moisture-proof structure according to claim 1 or 2, characterized in that: An air inlet (14) and an air outlet (15) are arranged between the cooler cavity (2) and the motor cavity (3); the air outlet (15) is located inside the cooler cavity (2); a cooler centrifugal fan (16) is arranged; the cooler centrifugal fan (16) is connected to a cooler centrifugal fan motor (17); and the cooler centrifugal fan motor (17) is fixedly connected to the structural cavity (1).

4. The air-water cooler motor dehumidification and moisture-proof structure according to claim 3 is characterized in that: A heater (13) is arranged at the air inlet (14) of the motor cavity (3).

5. The air-water cooler motor dehumidification and moisture-proof structure according to claim 1 or 2, characterized in that: A sealing ring (18) is provided between the delivery pipeline (6) and the structural cavity (1).

6. The air-water cooler motor dehumidification and moisture-proof structure according to claim 4 is characterized in that: When the air-water cooler motor stops running, after the motor cavity humidity sensor (11) detects that the actual humidity value in the motor cavity (3) is higher than the set humidity value, the motor PLC (12) is set to a structure capable of controlling the heater (13) to start; after the motor cavity humidity sensor (11) detects that the actual humidity value in the motor cavity (3) is lower than the set humidity value, the motor PLC (12) is set to a structure capable of controlling the heater (13) to stop.

7. The air-water cooler motor dehumidification and moisture-proof structure according to claim 5 is characterized in that: When the air-water cooler motor stops running, after the motor cavity temperature sensor (11) detects that the actual temperature value in the motor cavity (3) is lower than the set first temperature value, the motor PLC (12) is set to a structure capable of controlling the two heaters (13) to work simultaneously; after the motor cavity temperature sensor (11) detects that the actual temperature value in the motor cavity (3) is higher than the set second temperature value, the motor PLC (12) is set to a structure capable of controlling one heater (13) to stop heating and the other heater (13) to continue heating.

8. The dehumidification and moisture-proof structure of the air-water cooler motor according to claim 4 is characterized in that: After the motor cavity temperature sensor (10) detects that the actual temperature value in the motor cavity (3) is higher than the set third-level temperature value, the motor PLC (12) is configured to stop the heater (13) from heating; the first-level temperature value is less than the second-level temperature value and less than the third-level temperature value.

9. The air-water cooler motor dehumidification and moisture-proof structure according to claim 4, characterized in that: When the motor cavity pressure sensor (9) detects that the actual pressure value in the motor cavity (3) is greater than the set pressure value when the motor cooling centrifugal fan is operating normally, it indicates that the air-water cooler motor seal is abnormal, and the motor PLC (12) is set to a structure capable of controlling the alarm (20) to sound an alarm.

10. The air-water cooler motor dehumidification and moisture-proof structure according to claim 1 or 2, characterized in that: The water storage tank (5) is a structure made of transparent material, the delivery pipeline (6) is a silicone hose, and the one-way valve (7) is a membrane-type one-way valve.

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