CN1251386C - Device for recycling exhaust air and cooling fluid of condensator for evaporative cooling electric motor - Google Patents

Abstract

The condenser exhaust and coolant recovery device of the evaporative cooling motor of the present invention is designed for improving and perfecting the evaporative cooling system of the motor stator. The two ends of the device are respectively connected with the main condenser and the evaporative cooling chamber where the motor stator is soaked. The first pressure controller is installed on the top of the main condenser to connect with its condensing space. The first pressure controller is connected to the first solenoid valve, pumping Air pump, auxiliary condenser and gas-liquid separation box; the separated air enters the air filter through the first one-way valve, and is discharged after being filtered; the condensed liquid cooling medium (coolant) in the gas-liquid separation box passes through the first The pipes of the second pressure controller and the second solenoid valve flow back to the motor stator evaporative cooling chamber. The device of the invention discharges air when the pressure in the condensing space of the main condenser exceeds the set value, makes it work under the set pressure, and recovers the cooling liquid at the same time, so as to realize the requirement of efficient, safe and economical operation of the evaporative cooling system of the motor.

Description

Condenser exhaust and coolant recovery for evaporative cooled motors

technical field

The invention belongs to a motor cooling device, relates to the improvement and completion of an evaporative cooling motor, and provides a condenser exhaust and cooling liquid recovery device.

Background technique

Large-scale generators include turbo generators and hydro generators. Compared with commonly used air-cooled, water-cooled and hydrogen-cooled units, the evaporative cooling technology has the advantages of better cooling effect and safe and reliable operation. Here, the generator whose stator heating element adopts evaporative cooling is called an evaporative cooling motor. Its evaporative cooling device is a closed cooling medium circulation system. In the motor evaporative cooling chamber, the liquid cooling medium (also called coolant) absorbs the motor After the stator heats up, a boiling evaporation phase transition occurs, from liquid to gas, and enters the condenser for heat exchange with secondary cooling water, condenses into liquid and returns to the cooling circuit (evaporative cooling chamber). The boiling point of the cooling medium determines the operating temperature of the motor, and the boiling point of the cooling medium is closely related to the pressure of the condensation space. During the operation of the evaporative cooling generator, due to air leakage, the pressure of the condensation space often increases, causing the boiling point of the cooling medium to increase, and the cooling effect of the evaporative cooling motor is also reduced. At this time, in order to maintain a reasonable operating temperature, the valve must be opened to discharge air to reduce the pressure of the condensation space. However, part of the vapor of the cooling medium is also discharged while the air is discharged, which is not allowed in some applications, such as the space for installing evaporative cooling motors on ships is relatively narrow and the location is limited.

Chinese invention patent applications 01131399.4 and 01131397.8 provide two kinds of evaporative cooling devices for large-scale motors. In their evaporative cooling circuits, there are no condenser exhaust and cooling liquid recovery devices. Therefore, it is necessary to improve and perfect the evaporative cooling cycle of the evaporative cooling motor. By controlling the pressure of the condensing space, cooling media with different boiling points can be selected to meet the requirements of various applications, and at the same time realize the recovery of cooling liquid.

Contents of the invention

The object of the present invention is to provide a condenser exhaust and coolant recovery device for evaporative cooling motors, the device discharges air when the pressure in the condensing space of the main condenser exceeds the set value, keeps its pressure at the set pressure state, and simultaneously recovers the The cooling liquid (also known as cooling medium) leaked from the exhaust gas realizes the efficient and economical operation of the evaporative cooling motor.

The two ends of the exhaust gas of the condenser and the cooling liquid recovery device of the evaporative cooling motor of the present invention are respectively connected with the main condenser and the evaporative cooling chamber soaked in the heat-generating parts of the motor stator. The main condenser is located above the evaporative cooling chamber. A first pressure controller is installed on the top of the main condenser to communicate with its condensing space, and the first pressure controller is sequentially connected to the first solenoid valve, suction pump, auxiliary condenser and gas-liquid separation box; the upper part of the gas-liquid separation box is installed There is an exhaust pipe with a first one-way valve, which is connected to the air filter; the lower end of the gas-liquid separation box is connected with the second pressure controller, the second solenoid valve and the second one-way valve through a pipeline equipped with The evaporative cooling chamber is connected.

In the device of the present invention, the secondary condenser includes a water tank through which cooling water flows and a condensation pipe through which the mixture of cooling medium steam and air flows. There is a separation plate in the gas-liquid separation box to separate the inlet and the exhaust port. The air filter is a container for holding water in the lower part, the top is provided with an air outlet, and the near bottom is connected with the gas-liquid separation box with a pipeline equipped with a first check valve, and the bottom is also provided with a drain pipe and a valve. A leak detector is also installed on the main condenser.

The device of the present invention works in this way, when the condensing space on the top of the main condenser leaks due to the evaporative cooling circulation system and air is mixed in, the working pressure will rise, and when the pressure reaches the pressure upper limit set by the first pressure controller, the first electromagnetic valve will Open and the suction pump starts at the same time. The mixture of air and cooling medium gas in the main condenser is pumped into the secondary condenser by the suction pump, where it exchanges heat with the cooling water. The cooling medium is condensed into liquid and enters the gas-liquid separation box together with the air, and the air enters the air filter through the first one-way valve and is discharged into the atmosphere after being filtered. After the coolant flowing into the gas-liquid separation box reaches a certain height, it is detected by the second pressure controller here and sends a signal command to open the second solenoid valve to make the coolant flow into the liquid storage part of the evaporative cooling chamber. Since the operation of the air extraction pump reduces the pressure of the main condenser, when the pressure lower limit set by the first pressure controller is reached, the first electromagnetic valve and the air extraction pump are simultaneously closed to complete an exhaust cycle.

The device of the invention discharges gas when the pressure in the condensing space of the main condenser is too high, makes it work at a set pressure state, and recovers cooling liquid at the same time. In this way, it is really possible for the evaporative cooling device to achieve zero leakage of the cooling medium under long-term operating conditions and meet the requirements of efficient, economical and safe operation. Since the pressure of the condensing space can be controlled through the operation of the air pump, the boiling temperature of the cooling medium can be adjusted, thereby creating conditions for selecting cooling mediums with different boiling points and meeting environmental protection requirements. That is, through the operation of the air pump, the condensing space of the condenser is kept in a negative pressure state, so that the cooling medium boils at about 50 degrees Celsius, which is most suitable for the cooling requirements of the motor. At the same time, since the system operates in a negative pressure state, the leakage of coolant is also avoided.

Description of drawings

Fig. 1 is a schematic diagram of the condenser exhaust and cooling liquid recovery device of the evaporative cooling motor of the present invention.

Detailed ways

Figure 1 is an embodiment of the present invention. The heat-generating parts of the stator of the evaporative cooling motor are immersed in the evaporative cooling chamber 70 , and the main condenser 10 is located above the evaporative cooling chamber 70 . The two ends of the device of the present invention are respectively connected with the main condenser 10 and the evaporative cooling chamber 70 .

The main condenser 10 is a box body, the pipeline 16 through which the secondary cooling water passes through the box body, the upper part of the inner space of the box body is the condensation space 12, and the first pressure controller 11 and the water leakage detector are connected above the condensation space 12 outside the box body 15. In this embodiment, the first pressure controller 11 adopts the model XZY-150 electric contact pressure vacuum gauge, which has pressure display, pressure upper limit and pressure lower limit setting, and the pressure display, pressure upper limit and pressure lower limit setting have Correspondingly connect and disconnect the electrical contacts. Water leakage detector 15 can be provided by Chinese invention patent application 01131399.4. Send an alarm when the cooling water pipe 16 leaks. The first solenoid valve 13 , the suction pump 20 , the secondary condenser 30 and the gas-liquid separation box 40 are sequentially connected by the first pressure controller 11 . A first one-way valve 45 is installed on the top of the gas-liquid separation box 40 , and the first one-way valve 45 is connected to the air filter 50 again. The pipeline 47 at the lower end of the gas-liquid separation box 40 is connected to the evaporative cooling hair chamber 70 through the pipeline equipped with the second pressure controller 61, the second electromagnetic valve 63, and the second check valve 65, and supplies the liquid in the gas-liquid separation box 40. The cooling medium 44 flows back into the condensation space of the evaporative cooling chamber 70 .

In an embodiment, the suction pump 20 is a compressor commonly used in refrigeration machinery. The main body of the auxiliary condenser 30 includes a box body 32 and a spiral condenser tube 34 installed in the box body. The mixture of air and cooling medium vapor circulates in the condenser tube 34, and cooling water circulates in the box body 32. Both ends are equipped with inlet and outlet water. connector.

The inlet pipe of the gas-liquid separation box 40 is connected with the outlet pipe of the condensation pipe 34 of the secondary condenser 30 . There is a curved partition plate 41 in the upper space of the box to separate the inlet pipe 43 from the pipeline connecting the first one-way valve 45 of the exhaust air, the lower part stores the cooled and liquefied cooling medium 44, and the bottom has a liquid discharge pipe 47. When the cooling liquid stored in the gas-liquid separation box 40 reaches a certain height, the second pressure controller 61 (selecting the same electric contact pressure vacuum gauge as the first pressure controller 11) sends a signal, and the second solenoid valve 63 is opened to store The coolant 44 flows into the evaporative cooling chamber 70 through the drain pipe 47 and the second one-way valve 65 .

Water 54 is contained in the air filter 50, and the inlet pipe 53 that links to each other with the first one-way valve 45 is contained in the casing near the bottom position and is submerged in the water, and there is an exhaust port 51 at the top. The air entering the air filter 50 is discharged through the air outlet 51 after being filtered by the water 54 . A drain pipe and a valve 55 are also provided near the bottom for liquid discharge.

In the embodiment, the cooling medium is perfluorotriethylamine, whose molecular formula is (C ₂ F ₅ ) ₂ N, and its boiling point is 69 degrees Celsius under a standard atmospheric pressure; or sefluoropentane, whose molecular formula is C ₅ H ₂ F ₁₀ . , at a standard atmospheric pressure, the boiling point is 55 degrees Celsius.

Claims (5)

1. A condenser exhaust and coolant recovery device for evaporative cooling motors, characterized in that the two ends of the device are respectively connected to the main condenser and the evaporative cooling chamber, and a first pressure controller is installed in the main condenser The top is connected to its condensation space, and the first pressure controller is sequentially connected to the first solenoid valve, air pump, secondary condenser and gas-liquid separation box; the gas-liquid separation box is connected to the air filter through the first one-way valve; the gas-liquid separation box The lower end is connected with the evaporative cooling chamber through a pipeline equipped with a second pressure controller, a second electromagnetic valve and a second check valve. 2. The condenser exhaust and coolant recovery device for evaporative cooling motors according to claim 1, wherein the secondary condenser includes a box through which cooling water flows and a condensation pipe through which mixture of coolant and air flows. 3. The condenser exhaust and coolant recovery device for evaporative cooling motors according to claim 1, characterized in that the gas-liquid separation box has an isolation plate to isolate the inlet from the air outlet. 4. The condenser exhaust and coolant recovery device for evaporative cooling motors according to claim 1, wherein the air filter is a water container, the air inlet is submerged under water, and the top is provided with an exhaust There is a drain pipe and a valve at the bottom. 5. The condenser exhaust and coolant recovery device for evaporative cooling motors according to claim 1, characterized in that the first pressure controller and the second pressure controller used have pressure display, pressure upper limit and pressure lower limit setting, The pressure display, the pressure upper limit and the pressure lower limit setting have corresponding on and off electrical contacts.

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