Low-pressure heater drain pump motor winding cooling device and method

Abstract

The invention relates to a low-pressure heater drain pump motor winding cooling device and method. The device comprises a cooling unit, a monitoring unit and a control unit, heat dissipation fins are arranged on the outer surface of a motor shell needing to be cooled, and a metal cold water pipe is arranged in a groove between every two heat dissipation fins. A cooling medium is introduced into the metal cold water pipe, and the cooling medium flows to take away heat of the motor shell and further take away heat generated by a winding in the motor shell; in the cooling process, a monitoring unit in the cooling device monitors winding temperature information of the motor needing to be cooled in real time and feeds back the winding temperature information to a control unit; and the control unit controls the opening degree of each regulating valve in the cooling unit according to the winding temperature information fed back by the monitoring unit so as to control the flow of the cooling medium. Compared with the prior art, the invention has the advantages of controllable cooling process, high efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of motor winding cooling, and in particular to a low-pressure steam pump motor winding cooling device and method. Background Art

[0002] Currently, the mainstream method of electric motor cooling is motor-built-in fan cooling. Air-to-air coolers are also used on large motors to cool high-voltage motors. In new energy vehicles, the drive motor is cooled by liquid cooling, that is, the motor is immersed in insulating coolant, and the coolant removes the heat from the motor through a heat exchanger.

[0003] The low-pressure drain pump is operated in a variable frequency mode, and the water level of the No. 8 low-pressure water pump is controlled by automatic frequency changes. The drain pressure is automatically controlled by the drain adjustment door to ensure that the drain pressure is always greater than the condensate pressure so that the drain can be recovered as condensate. In actual operation, it was found that the low-pressure drain pump operates at a frequency close to the power frequency under high load, and the working environment is harsh, the heat dissipation is poor, and the drain pump coil is seriously heated. Through operation observation, when the variable frequency current of the No. 5 low-pressure drain pump B is 276A, the winding temperature rises to 108℃. Long-term operation will cause irreversible damage to the motor winding.

[0004] Currently, the LP-type drain pump motor is cooled by an external shaft cooling fan, and the maximum operating temperature has never exceeded 92°C. This additional fan makes it difficult to switch between LP-type drain pumps and conduct equipment inspections. Furthermore, if the cooling fan fails, it is difficult for operators to detect it promptly.

[0005] Among existing motor winding cooling technologies, the invention patent with publication number CN119123876A provides a highly efficient and energy-saving control method for evaporative cooler systems. By adjusting the inlet valve and controlling the cooling spray water volume to adapt to changing operating conditions, this method reduces fan and water pump energy consumption. However, this method is primarily designed for large evaporative cooler systems and requires frequent adjustments to the fan and water pump during application, resulting in complex operation and difficulty in accurately controlling energy consumption. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a low-pressure drain pump motor winding cooling device and method.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to one aspect of the present invention, a low-pressure steam pump motor winding cooling device is provided, characterized in that the device includes a cooling unit, a monitoring unit and a control unit;

[0009] The cooling unit includes a metal cold water pipe, a heat dissipation fin and a regulating valve. The heat dissipation fin is arranged on the outer surface of the motor housing to be cooled. A metal cold water pipe is provided in the groove between each two heat dissipation fins.

[0010] The monitoring unit is used to monitor the winding temperature information of the motor that needs to be cooled in real time;

[0011] The control unit is used to control the opening of the regulating valve according to the winding temperature information of the motor.

[0012] As an optimal technical solution, the cooling unit also includes a water inlet ring and a water outlet ring. Both the water inlet ring and the water outlet ring adopt a closed ring structure in which a metal copper tube surrounds the motor housing. The inner diameter thereof matches the outer diameter of the motor housing to ensure a tight fit and form an evenly distributed cooling medium circulation channel; and both the water inlet ring and the water outlet ring have multiple branch pipe interfaces evenly distributed circumferentially, and the number of branch pipe interfaces is consistent with the number of metal cold water pipes. The branch pipe interfaces are rigidly connected to the two ends of the metal cold water pipe by welding or threaded connection to form a parallel cooling circuit of water inlet ring-branch pipe-metal cold water pipe-branch pipe-water outlet ring.

[0013] As an optimal technical solution, the cooling unit also includes a water inlet and a water outlet, which are respectively arranged at 180° symmetrical positions of the water inlet ring and the water outlet ring, and the water inlet and the water outlet are connected to the ring pipe in a tangential direction, and the angles with the tangent of the ring circle are ≤15°. The water inlet and the water outlet both adopt convex flanges with sealing rings, which are connected to the external cooling pipeline by bolts, and a guide cone is also provided on the inside of the flange.

[0014] As a preferred technical solution, isolation valves are installed at the water inlet and outlet. Under normal operating conditions, the isolation valves are in a normally open state to ensure the smooth flow of the cooling pipeline.

[0015] As a preferred technical solution, there are at least two regulating valves, which are respectively arranged at the water inlet position on the water inlet ring close to the motor side and the water outlet position on the water outlet ring close to the motor side.

[0016] As a preferred technical solution, the monitoring unit is a PTC temperature sensor, which is used to monitor the winding temperature information of the motor that needs to be cooled in real time.

[0017] As a preferred technical solution, the control unit uses DCS as the core control unit. One end of the control unit is connected to the monitoring unit to receive the winding temperature information of the motor, and the other end is connected to the regulating valve in the cooling unit to control its opening.

[0018] According to another aspect of the present invention, a method for cooling the windings of a low-pressure steam pump motor is provided, wherein the method comprises the following steps:

[0019] S1. Heat dissipation fins are provided on the outer surface of the motor housing to be cooled, and metal cooling water pipes are provided in the grooves between each two heat dissipation fins;

[0020] S2. A cooling medium is introduced into the metal cold water pipe. The cooling medium flows away the heat of the motor housing and then removes the heat generated by the winding inside the motor housing;

[0021] S3. During the cooling process, the monitoring unit in the cooling device monitors the winding temperature information of the motor to be cooled in real time and feeds the winding temperature information back to the control unit;

[0022] S4. The control unit controls the opening of each regulating valve in the cooling unit according to the winding temperature information fed back by the monitoring unit, thereby controlling the flow rate of the cooling medium.

[0023] As a preferred technical solution, the cooling medium introduced into the metal cold water pipe is closed cooling water.

[0024] As a preferred technical solution, the control unit in S4 controls the opening of each regulating valve in the cooling unit based on the winding temperature information fed back by the monitoring unit. The specific process is as follows: when the winding temperature is higher than the preset winding temperature, the control module controls the regulating valve to increase the opening, so that more cooling medium flows into the metal cold water pipe, speeding up the heat removal speed; conversely, when the winding temperature is lower than the preset winding temperature, the regulating valve opening is controlled to decrease, thereby achieving precise cooling of the motor winding.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention includes a cooling unit, a monitoring unit and a control unit. In the cooling unit, a metal cold water pipe is provided in the slot between each two heat dissipating fins. The monitoring unit is used to monitor the winding temperature information of the motor to be cooled in real time, and the opening of the regulating valve is controlled according to the winding temperature information of the motor. The opening of the regulating valve at the water inlet can be automatically controlled according to the winding temperature of the set motor to be controlled, thereby realizing precise control of the cooling process and facilitating the control of the motor winding temperature within a safe range.

[0027] 2. In the cooling unit of the present invention, the water inlet ring and the water outlet ring both adopt a closed ring structure in which a metal copper tube surrounds the motor housing. The inner diameter thereof matches the outer diameter of the motor housing to ensure a tight fit and form a uniformly distributed cooling medium flow channel. The metal cold water pipe, the water inlet ring and the water outlet ring in the groove between each two heat dissipating fins form a parallel cooling circuit of the water inlet ring-branch pipe-metal cold water pipe-branch pipe-water outlet ring. The equidistant diversion characteristics of the annular ring ensure that the inlet pressure of each branch pipe is consistent, so that the cooling flow is evenly distributed. The metal cold water pipes are independent of each other and work in coordination, so that the cooling medium can flow evenly through each heat dissipating fin area, efficiently taking away the heat generated during the operation of the motor.

[0028] 3. In the present invention, the water inlet and the water outlet are respectively arranged at 180° symmetrical positions of the water inlet and outlet rings, and the water inlet and the water outlet are connected to the ring pipe in a tangential direction, and the angles between the water inlet and the water outlet and the tangent of the ring circle are ≤15°. This design can form a uniform circumferential flow when the cooling medium enters the ring, avoiding local vortexes and uneven pressure caused by direct radial access; the water inlet and the water outlet both adopt convex flanges with sealing rings, which are connected to the external cooling pipeline by bolts. A guide cone is also provided on the inner side of the flange to guide the high-speed fluid in the center of the pipeline to the inner wall of the ring, reducing flow resistance, and thereby reducing the power required for the flow of the cooling medium, with significant energy-saving effects.

[0029] 4. The present invention is equipped with an isolation valve. Under normal operating conditions, the isolation valve is in a normally open state to ensure the unobstructed flow of the cooling pipeline. In scenarios such as maintenance, the cooling pipeline can be easily and efficiently blocked.

[0030] 5. The cooling medium in this invention is closed-loop cooling water, which is more energy-efficient. Closed-loop cooling water is typically recycled (e.g., through a cooler to exchange heat with open-loop water or other cooling medium), resulting in high heat exchange efficiency. It does not require continuous reliance on air convection like a fan, thus reducing efficiency fluctuations caused by ambient temperature changes and indirectly reducing the energy consumption required to maintain the cooling effect of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of the tail of the motor equipped with the low-pressure steam pump motor winding cooling device in the embodiment;

[0032] Figure 2 A side view of a motor equipped with a low-pressure steam pump motor winding cooling device in an embodiment;

[0033] Figure 3 The figure is a schematic diagram of the steps of a low-pressure steam pump motor winding cooling method according to the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0035] Currently, the mainstream method of electric motor cooling is motor-built-in fan cooling. Air-to-air coolers are also used on large motors to cool high-voltage motors. In new energy vehicles, the drive motor is cooled by liquid cooling, that is, the motor is immersed in insulating coolant, and the coolant removes the heat from the motor through a heat exchanger.

[0036] The low-pressure drain pump is operated in a variable frequency mode. The low-pressure water level of the first low-pressure drain pump is controlled by automatic frequency change. The drain pressure is automatically controlled by the drain adjustment door to ensure that the drain pressure is always greater than the condensate pressure so that the drain can be recovered as condensate. In actual operation, it was found that the low-pressure drain pump operates at a frequency close to the power frequency under high load, and the working environment is harsh, the heat dissipation is poor, and the drain pump coil is seriously heated. Through operation observation, the variable frequency current of the second low-pressure drain pump B is 276A, and the winding temperature rises to 108℃. Long-term operation will cause irreversible damage to the motor winding.

[0037] Currently, the motor of the second unit's low-pressure steam heater is cooled by two external axial cooling fans, and its maximum operating temperature has never exceeded 92°C. This configuration makes it difficult to switch between low-pressure steam heaters and conduct equipment inspections, and it also makes it difficult for operators to detect a failure of the additional cooling fans.

[0038] Example

[0039] In this embodiment, a low-pressure drain pump motor winding cooling device is used, which includes a cooling unit, a monitoring unit and a control unit; wherein, the cooling unit includes a metal cold water pipe, heat dissipation fins and a regulating valve, the heat dissipation fins are arranged on the outer surface of the motor housing to be cooled, and a metal cold water pipe is provided in the groove between each two heat dissipation fins; the monitoring unit is used to monitor the winding temperature information of the motor to be cooled in real time; the control unit is used to control the opening of the regulating valve according to the winding temperature information of the motor.

[0040] This solution involves placing metal cooling water pipes within the fan fins of the motor housing. Cold water is passed through the pipes as a cooling medium. The cold water removes heat from the motor housing, and in turn, removes heat from the windings within the motor housing.

[0041] In this embodiment, four groups of heat dissipation fins are provided, which are distributed around the motor housing. Each group of heat dissipation fins includes a plurality of heat dissipation fins, and metal cold water pipes are provided between every two heat dissipation fins, forming a top cold water pipe, a bottom cold water pipe, a left cold water pipe and a right cold water pipe. Figure 1 、 Figure 2 shown.

[0042] In this embodiment, the metal cooling water pipes are copper tubes. Specifically, a row of copper tubes is placed in the groove between each pair of fins. The copper tubes in the four upper, lower, left, and right sections are connected at both ends to a collecting ring. This collecting ring is a metal copper tube that surrounds the motor housing. Two collecting rings are each equipped with an electric regulating valve at the water inlet on the left side of the motor, enabling precise temperature control of the motor windings. The motor housing is divided into four upper, lower, left, and right sections. The metal cooling water pipes in each section are connected to a collecting ring at both ends. The collecting ring acts as a hub, connecting the metal cooling water pipes in different sections into a complete cooling circulation system. It allows the cooling medium to be distributed in an orderly manner from the inlet collecting ring to the metal cooling water pipes in each section, and then from the water pipes in each section to the outlet collecting ring, ensuring smooth circulation of the cooling medium throughout the cooling device and laying the foundation for efficient cooling of the motor windings.

[0043] Regulating valves are installed on each of the two collecting rings. Precise control of these two regulating valves allows for flexible adjustment of the closed-circuit cooling water flow rate entering each zone's metal cooling water pipes to meet the cooling needs of different areas. Since the heat generation of the motor windings in different zones may vary during operation, for example, due to uneven load distribution, some areas generate more heat. In this case, the electric regulating valves at the corresponding collecting rings can be adjusted to increase the cooling medium flow rate in that area, enhancing the cooling effect. The flow rate can be appropriately reduced in areas with less heat generation, achieving more precise zoned temperature control of the motor windings and ensuring stable operation at the appropriate temperature for all motor windings.

[0044] The cooling unit is also provided with a circulation pipe, which connects the water inlet and the water outlet. The circulation pipe is connected to a circulation pump to form a closed loop flow of the cooling medium.

[0045] The collector ring is a copper tube that wraps around the motor housing, offering excellent thermal conductivity and sealing. This excellent sealing prevents leakage during the cooling medium's circulation, maintaining normal pressure in the cooling system and ensuring consistent cooling. When the cooling line is securely installed and leak-free, the cooling circuit can operate for extended periods, with the same reliability as a closed-circuit cooling water system.

[0046] The excellent thermal conductivity of the cooling unit helps to quickly transfer heat between the collecting ring and the metal cold water pipe, further improving the heat exchange efficiency and allowing the cooling medium to more effectively absorb and remove heat from the motor casing, thereby improving the cooling performance of the motor winding.

[0047] The cooling copper tubes installed in this solution are buried in the heat dissipation fins and are relatively stationary with the motor housing during operation. Therefore, they are basically free of wear and tear during use and have a long service life. The cooling unit also includes a water inlet ring and a water outlet ring. Both the water inlet ring and the water outlet ring adopt a closed ring structure in which a metal copper tube surrounds the motor housing. The inner diameter of the water inlet ring and the water outlet ring match the outer diameter of the motor housing to ensure a tight fit and form a uniformly distributed cooling medium flow channel. In addition, the water inlet ring and the water outlet ring are evenly distributed with multiple branch pipe interfaces in the circumference. The number of branch pipe interfaces is consistent with the number of metal cold water pipes. The branch pipe interfaces are rigidly connected to the two ends of the metal cold water pipe by welding or threaded connection, forming a parallel cooling circuit of water inlet ring-branch pipe-metal cold water pipe-branch pipe-water outlet ring.

[0048] Both the inlet and outlet manifolds utilize a closed ring structure with a metal copper tube surrounding the motor housing. Its inner diameter matches the outer diameter of the motor housing, ensuring a snug fit and creating a uniformly distributed cooling medium flow channel. The geometric symmetry of the ring structure ensures uniform flow distribution of the cooling medium as it enters each metal cooling water pipe, avoiding localized cooling blind spots caused by uneven piping layout. The resulting parallel cooling circuit—inlet manifold—branch pipe—metal cooling water pipe—branch pipe—outlet manifold—improves flow balance in the cooling system. The ring-shaped manifold structure evenly distributes the cooling medium from the water inlet to each metal cooling water pipe, avoiding the flow attenuation problem at the far end of the pipe caused by longitudinal resistance in traditional in-line manifolds. Fluid dynamics simulations have verified that the ring-shaped manifold design can control flow deviations between each branch pipe to within ±5%, significantly improving circumferential temperature uniformity around the motor housing.

[0049] In this embodiment, the water inlet and outlet collecting rings are made of copper tubes with a thermal conductivity coefficient of ≥380W / (m·K). The inner walls are nickel-plated or coated with an anti-corrosion coating to withstand long-term erosion by closed cooling water. A 2-5mm air insulation layer is reserved between the collecting rings and the motor housing to prevent condensed water on the surface of the collecting rings from directly contacting the insulation layer of the housing, thereby improving system safety.

[0050] The cooling unit also includes a water inlet and a water outlet, which are respectively arranged at 180° symmetrical positions of the water inlet and outlet rings, and the water inlet and the water outlet are connected to the ring pipe in a tangential direction, and the angle between them and the tangent of the ring circle is ≤15°. This design can form a uniform circumferential flow when the cooling medium enters the ring, avoiding local vortexes and uneven pressure caused by direct radial access. The water inlet and the water outlet both use convex flanges with sealing rings, which are connected to the external cooling pipeline by bolts. A guide cone is also provided on the inside of the flange to guide the high-speed fluid in the center of the pipeline to the inner wall of the ring to reduce flow resistance.

[0051] In this embodiment, a 20 mm maintenance gap is reserved at the flange connection to facilitate wrench operation and sealing ring replacement.

[0052] Isolation valves are installed at the water inlet and outlet. Under normal operating conditions, the isolation valves are in a normally open state to ensure the smooth flow of the cooling pipeline and are easy to operate.

[0053] There are at least two regulating valves, which are respectively arranged at the water inlet position on the water inlet collecting ring close to the motor side, and the water outlet position on the water outlet collecting ring close to the motor side.

[0054] The monitoring unit is a PTC (Positive Temperature Coefficient) temperature sensor, used to monitor the winding temperature of the motor in real time. The control unit uses a distributed control system (DCS) as its core control unit. One end of the control unit is connected to the monitoring unit to receive motor winding temperature information, and the other end is connected to the regulating valve in the cooling unit to control its opening.

[0055] The main component of a PTC temperature sensor is a thermistor with a positive temperature coefficient. The resistance of this thermistor increases dramatically with increasing temperature. In this cooling device, the PTC temperature sensor is installed in a location where it can accurately sense the temperature of the motor winding. As the motor winding temperature changes, the resistance of the thermistor changes accordingly. For example, as the winding temperature rises, the thermistor's resistance increases rapidly; conversely, as the winding temperature decreases, the resistance decreases.

[0056] The sensor converts this change in resistance into an electrical signal and transmits it to the control unit. The control unit converts the signal into a corresponding temperature value and compares it with the preset winding temperature.

[0057] If the monitored winding temperature is higher than the preset winding temperature, the control unit will control the cooling unit's regulating valve to open wider based on the deviation, allowing more cooling medium (such as closed-loop cooling water) to flow into the metal cooling water pipe, accelerating heat removal and thus reducing the winding temperature. Conversely, when the winding temperature is lower than the preset winding temperature, the control unit controls the regulating valve to open narrower, reducing the cooling medium flow rate to avoid overcooling and achieve precise cooling control of the motor winding.

[0058] The PTC temperature sensor monitors the winding temperature in real time and works in conjunction with the control unit and cooling unit. The cooling device can automatically adjust the flow of the cooling medium according to the actual temperature of the motor winding, ensuring that the motor winding is always within the appropriate temperature range, thereby improving the operating efficiency and safety of the motor and extending its service life.

[0059] In this embodiment, the cooling medium introduced into the metal cold water pipe is closed cooling water.

[0060] Currently, cooling is provided by two additional axial flow fans with a total operating power of 1.1kW. Even under low load conditions, the temperature of the low-pressure drain pump motor winding is within the normal range, but the fans are not shut down. The accumulated power consumption is also very alarming. Using closed-circuit cooling water as the water source does not require an additional power supply, and the energy saving effect is significant.

[0061] The low-voltage drain pump motor winding cooling system in this solution has a wide range of applications. It can be used to accurately control the motor winding temperature of general low-voltage 380V motors with cooling fins on their housings and motors that are convenient for connecting to closed cooling water systems.

[0062] According to the above cooling system, controllable cooling can be performed, and the steps are as follows: Figure 3 As shown, specifically including:

[0063] S1. Heat dissipation fins are provided on the outer surface of the motor housing to be cooled, and metal cooling water pipes are provided in the grooves between each two heat dissipation fins;

[0064] S2. A cooling medium is introduced into the metal cold water pipe. The cooling medium flows away the heat of the motor housing and then removes the heat generated by the winding inside the motor housing;

[0065] S3. During the cooling process, the monitoring unit in the cooling device monitors the winding temperature information of the motor to be cooled in real time and feeds the winding temperature information back to the control unit;

[0066] S4. The control unit controls the opening of each regulating valve in the cooling unit according to the winding temperature information fed back by the monitoring unit, thereby controlling the flow rate of the cooling medium.

[0067] In this method, the control unit in S4 controls the opening of each regulating valve in the cooling unit based on the winding temperature information fed back by the monitoring unit. The specific process is as follows: when the winding temperature is higher than the preset winding temperature, the control module controls the regulating valve to increase the opening, so that more cooling medium flows into the metal cold water pipe, speeding up the heat removal speed; conversely, when the winding temperature is lower than the preset winding temperature, the regulating valve is controlled to decrease the opening, thereby achieving precise cooling of the motor winding.

[0068] In summary, the winding temperature is collected in real time through the monitoring unit, and the control unit dynamically adjusts the opening of the regulating valve according to the preset threshold, so as to realize the dynamic adaptive adjustment mechanism, precise temperature control, and ensure the safe operation of the motor; the flow optimization of on-demand cooling is different from the energy waste of "constant speed operation" of traditional axial flow fans. This method realizes dynamic matching of cooling medium flow through temperature-flow closed-loop control, saves energy and reduces consumption, and reduces operating costs; eliminates invalid operation losses. Traditional fans still need to maintain the minimum speed at low load (to avoid bearing lubrication failure), resulting in "no-load power consumption"; and this method completely closes the regulating valve, which can cut off the flow of cooling medium when the motor is stopped or at extremely low load. At this time, the system energy consumption is only the weak power consumption of the monitoring unit.

[0069] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A low-pressure steam pump motor winding cooling device, characterized in that: The device includes a cooling unit, a monitoring unit and a control unit; The cooling unit includes a metal cold water pipe, a heat dissipation fin and a regulating valve. The heat dissipation fin is arranged on the outer surface of the motor housing to be cooled. A metal cold water pipe is provided in the groove between each two heat dissipation fins. The monitoring unit is used to monitor the winding temperature information of the motor that needs to be cooled in real time; The control unit is used to control the opening of the regulating valve according to the winding temperature information of the motor.

2. The low-pressure steam pump motor winding cooling device according to claim 1 is characterized in that: The cooling unit also includes a water inlet ring and a water outlet ring. Both the water inlet ring and the water outlet ring adopt a closed ring structure in which a metal copper tube surrounds the motor housing. The inner diameter thereof matches the outer diameter of the motor housing to ensure a tight fit and form a uniformly distributed cooling medium circulation channel; and both the water inlet ring and the water outlet ring have multiple branch pipe interfaces uniformly distributed circumferentially, and the number of branch pipe interfaces is consistent with the number of metal cold water pipes. The branch pipe interfaces are rigidly connected to the two ends of the metal cold water pipe by welding or threaded connection to form a parallel cooling circuit of water inlet ring-branch pipe-metal cold water pipe-branch pipe-water outlet ring.

3. The low-pressure steam pump motor winding cooling device according to claim 2 is characterized in that: The cooling unit also includes a water inlet and a water outlet, which are respectively arranged at 180° symmetrical positions of the water inlet and outlet rings, and the water inlet and the water outlet are connected to the ring pipe in a tangential direction, and the angles with the tangent of the ring circle are ≤15°. The water inlet and the water outlet both adopt convex flanges with sealing rings, which are connected to the external cooling pipeline by bolts, and a guide cone is also provided on the inner side of the flange.

4. The low-pressure steam pump motor winding cooling device according to claim 3 is characterized in that: Isolation valves are installed at the water inlet and the water outlet. Under normal operating conditions, the isolation valves are in a normally open state to ensure the smooth flow of the cooling pipeline.

5. The low-pressure steam pump motor winding cooling device according to claim 3 is characterized in that: There are at least two regulating valves, which are respectively arranged at the water inlet position on the water inlet collecting ring close to the motor side, and the water outlet position on the water outlet collecting ring close to the motor side.

6. The low-pressure steam pump motor winding cooling device according to claim 1 is characterized in that: The monitoring unit is a PTC temperature sensor, which is used to monitor the winding temperature information of the motor that needs to be cooled in real time.

7. The low-pressure steam pump motor winding cooling device according to claim 6 is characterized in that: The control unit adopts DCS as the core control unit. One end of the control unit is connected to the monitoring unit to receive the winding temperature information of the motor, and the other end is connected to the regulating valve in the cooling unit to control its opening.

8. A method for cooling the windings of a low-pressure steam pump motor, characterized in that: The method is applied to a low-pressure steam pump motor winding cooling device as described in any one of claims 1 to 7, and the method comprises the following steps: S1. Heat dissipation fins are provided on the outer surface of the motor housing to be cooled, and metal cooling water pipes are provided in the grooves between each two heat dissipation fins; S2. A cooling medium is introduced into the metal cold water pipe. The cooling medium flows away the heat of the motor housing and then removes the heat generated by the winding inside the motor housing; S3. During the cooling process, the monitoring unit in the cooling device monitors the winding temperature information of the motor to be cooled in real time and feeds the winding temperature information back to the control unit; S4. The control unit controls the opening of each regulating valve in the cooling unit according to the winding temperature information fed back by the monitoring unit, thereby controlling the flow rate of the cooling medium.

9. The method for cooling the windings of a low-pressure steam pump motor according to claim 8, characterized in that: The cooling medium introduced into the metal cold water pipe is closed cooling water.

10. A method for cooling windings of a low-pressure steam pump motor according to claim 8, characterized in that: The specific process of the control unit in S4 controlling the opening of each regulating valve in the cooling unit based on the winding temperature information fed back by the monitoring unit is as follows: when the winding temperature is higher than the preset winding temperature, the control module controls the regulating valve to increase the opening, so that more cooling medium flows into the metal cold water pipe, thereby speeding up the heat removal speed; conversely, when the winding temperature is lower than the preset winding temperature, the regulating valve is controlled to decrease the opening, thereby achieving precise cooling of the motor winding.

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