High-speed pump cooling joint control system and application method thereof

Abstract

The invention relates to a high-speed pump cooling joint control system and an application method thereof. The high-speed pump cooling joint control system comprises a temperature acquisition module, a cooling water flow control module, a joint control module and a regulating valve opening control module. The temperature acquisition module is used for acquiring the temperature of a motor cavity and the temperature of a mechanical seal cavity; the joint control module is used for obtaining the temperature of a motor cavity and the temperature of a mechanical seal cavity and outputting joint control signals to the cooling water flow control module and the adjusting valve opening degree control module. The cooling water flow control module is used for adjusting the cooling water flow of motor water cooling based on the joint control signal; and the regulating valve opening control module is used for regulating the opening of a regulating valve for washing the mechanical seal based on the joint control signal. Combined control of motor cooling and mechanical seal cooling is achieved, the situation that the temperature of the motor cavity is too high to affect the mechanical seal and the temperature of the mechanical seal cavity is too high to affect the motor cavity is avoided, and the service life of the high-speed pump is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of control systems, and in particular to a high-speed pump cooling joint control system and an application method thereof. Background Art

[0002] At present, high-speed pumps are a type of pump equipment that achieves efficient transportation through high speed, and are widely used in the fields of petrochemical, aerospace, energy and power. Due to the high speed of high-speed pumps, overheating is prone to occur at the motor and mechanical seal of the high-speed pump, so the motor and mechanical seal need to be cooled to prevent it.

[0003] The cooling of the motor is usually carried out by water cooling. For example, Chinese patent application number 20161071869618 discloses a water-cooled motor housing for automobiles, in which a water jacket is detachably installed on the motor housing, and a water inlet and a water outlet are arranged on the water jacket, thereby cooling the motor housing.

[0004] The mechanical seal is usually cooled by flushing the mechanical seal. For example, Chinese patent application number 2016106037352 discloses a centrifugal pump mechanical seal flushing device, which connects a mechanical seal flushing pipe between the mechanical seal sealing cavity of the pump body and the water inlet of the pump body, and cools the mechanical seal by flushing the mechanical seal with flowing water.

[0005] Regarding the above-mentioned related technologies, the inventors believe that although the above-mentioned cooling of the motor housing and the machine seal is achieved, the overheating of the motor housing will often affect the operation of the machine seal, and the overheating of the machine seal will also affect the operation of the motor. The existing high-speed pump does not have a combined control method for motor housing cooling and machine seal cooling. Summary of the invention

[0006] In order to achieve joint control of motor housing and machine seal cooling, the present application provides a high-speed pump cooling joint control system and an application method thereof.

[0007] The high-speed pump cooling joint control system provided in this application adopts the following technical solution: A high-speed pump cooling joint control system, comprising a temperature acquisition module, a cooling water flow control module, a joint control module and a regulating valve opening control module; The temperature acquisition module is used to collect the motor cavity temperature and the machine sealing cavity temperature; The joint control module is used to obtain the motor cavity temperature and the machine seal cavity temperature, and output a joint control signal to the cooling water flow control module and the regulating valve opening control module; The cooling water flow control module adjusts the cooling water flow of the motor water cooling based on the joint control signal; The regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing based on the joint control signal.

[0008] Preferably, the cooling water flow control module adjusts the cooling water flow for cooling the motor using a cooling water flow control formula based on the acquired joint control signal.

[0009] Preferably, the cooling water flow control formula is as follows: Q 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )), T 机 ≤T 3 ; Q 1 =bP((2T 机 -T 2 ) / T 2 )(1-η) / (KL 厚 (T 电 -T 水 )), T 机 >T 3 ; In the formula, Q 1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the motor input power, η is the motor efficiency, K is the thermal conductivity of the motor housing material, L 厚 is the equivalent thickness of the motor housing, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the temperature of the sealing chamber, T 3 Set the rated temperature for the machine seal chamber.

[0010] Preferably, the regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing using a regulating valve opening control formula based on the acquired joint control signal.

[0011] Preferably, the regulating valve opening control formula is as follows: In the formula, D is the opening of the regulating valve, f is the friction coefficient of the contact surface between the dynamic and static rings, and p e is the contact surface load ratio of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, A is the contact surface area of ​​the dynamic and static rings, a is the correction coefficient, C e is the flow coefficient of the regulating valve limiting hole, ρ is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal chamber and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, T 2 Set the rated temperature for the motor cavity.

[0012] Preferably, the mechanical seal friction heat per unit time formula is as follows: Q机 =fp e vA; Where, f is the friction coefficient of the contact surface between the moving and static rings, p e is the contact surface specific load of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, and A is the contact surface area of ​​the dynamic and static rings; The required flushing flow rate of the seal is calculated according to the formula of friction heat per unit time of the mechanical seal. The formula of flushing flow rate required by the mechanical seal is as follows: In the formula, Q 2 is the volume flow rate of the medium in the mechanical seal flushing pipeline, ρ is the density of the conveying medium, C is the specific heat of the medium, and T is the temperature difference between the mechanical seal cavity and the water inlet of the pump body; The formula for the flushing flow rate required for the mechanical seal is deduced by the dimensionless method to obtain the regulating valve opening control formula.

[0013] A high-speed pump cooling joint control method provided in this application adopts the following technical solution: A method for applying the high-speed pump cooling joint control system as described in the above technical solution comprises the following steps: Step S100, collecting the motor cavity temperature and the machine seal cavity temperature in real time; Step S200, outputting a joint control signal to a cooling water flow control module and a regulating valve opening control module based on the motor cavity temperature, adjusting the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing; Step S300: outputting a joint control signal to a cooling water flow control module and a regulating valve opening control module based on the temperature of the machine seal chamber, so as to adjust the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing.

[0014] Preferably, step S200 includes the following steps: Based on the motor cavity temperature, determine whether the motor cavity temperature is greater than the set rated temperature T 2 ; If the motor cavity temperature is greater than the motor cavity set rated temperature T 2 The cooling water flow control module adjusts the cooling water flow of the motor cooling based on the cooling water flow control formula, and the regulating valve opening control module adjusts the valve opening control formula (T 电 / T 2 ) times to adjust the opening of the regulating valve for mechanical seal flushing, where T 2 Set the rated temperature for the motor cavity, T 电 is the motor cavity temperature; If the motor cavity temperature is lower than the motor cavity set rated temperature T 2The cooling water flow control module adjusts the cooling water flow for motor cooling based on the cooling water flow control formula, and the regulating valve opening control module adjusts the regulating valve opening for machine seal flushing based on the regulating valve opening control formula.

[0015] Preferably, step S300 includes the following steps: Based on the temperature of the machine sealing chamber, determine whether the temperature of the machine sealing chamber is greater than the set rated temperature T of the machine sealing chamber. 3 ; If the temperature of the machine seal cavity is greater than the set rated temperature T 3 The regulating valve opening control module adjusts the regulating valve opening of the mechanical seal flushing based on step S200, and the cooling water flow control module uses the cooling water flow control formula (2T 机 -T 2 ) / T 2 ) times to adjust the cooling water flow rate for motor cooling, where T 机 is the temperature of the sealing chamber, T 2 Set a rated temperature for the motor cavity; If the temperature of the sealing chamber is lower than the set rated temperature T 3 The cooling water flow control module adjusts the cooling water flow for motor cooling based on step S200, and the regulating valve opening control module adjusts the regulating valve opening for machine seal flushing based on step S200.

[0016] Preferably, the cooling water flow control formula is as follows: Q 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )), T 机 ≤T 3 ; Q 1 =bP((2T 机 -T 2 ) / T 2 )(1-η) / (KL 厚 (T 电 -T 水 )), T 机 >T 3 ; In the formula, Q 1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the motor input power, η is the motor efficiency, K is the thermal conductivity of the motor housing material, L 厚 is the equivalent thickness of the motor housing, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the temperature of the sealing chamber, T 3To set the rated temperature; The control formula of the regulating valve opening is as follows: Where, f is the friction coefficient of the contact surface between the moving and static rings, p e is the contact surface load ratio of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, A is the contact surface area of ​​the dynamic and static rings, a is the correction coefficient, C e is the flow coefficient of the regulating valve limiting hole, ρ is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal chamber and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, T 2 To set the rated temperature.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: The present application collects the motor cavity temperature and the machine seal cavity temperature through the temperature collection module, and then the joint control module adjusts the cooling water flow of the motor water cooling through the cooling water flow control module, and the regulating valve opening control module adjusts the regulating valve opening of the machine seal flushing, thereby realizing the joint control of the motor cooling and the machine seal cooling, thereby avoiding the excessively high motor cavity temperature affecting the machine seal, and the excessively high machine seal cavity temperature affecting the motor cavity, so as to increase the service life of the high-speed pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a high-speed pump.

[0019] Figure 2 It is a cross-sectional schematic diagram of a high-speed pump.

[0020] Figure 3 It is the system block diagram of the high-speed pump cooling joint control system.

[0021] Figure 4 It is a method block diagram of the high-speed pump cooling joint control method.

[0022] Explanation of the reference numerals: 100, pump body; 200, motor; 1, motor housing; 2, motor shaft; 3, mechanical seal end cover; 4, mechanical seal chamber; 5, mechanical seal; 6, impeller assembly; 7, water inlet; 8, water outlet; 9, water cooling hood; 10, water cooling channel; 11, cooling water inlet; 12, cooling water outlet; 13, mechanical seal flushing pipe; 14, regulating valve. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-4 This application is described in further detail.

[0024] Embodiment 1 A high-speed pump cooling joint control system, referring to Figure 1 and Figure 2As shown, it is used in a high-speed pump, which includes a pump body 100 and a motor 200 installed on the pump body 100. The motor 200 includes a motor housing 1 and a motor shaft 2 rotatably arranged in the motor housing 1. A stator winding is arranged on the inner wall of the motor housing 1, and a rotor assembly matching the stator winding is arranged on the motor shaft 2.

[0025] An organic sealing end cover 3 is provided at the end of the motor housing 1, an organic sealing cavity 4 is provided in the organic sealing end cover 3, a mechanical seal 5 is provided in the organic sealing cavity 4, and the mechanical seal 5 is hereinafter referred to as the organic seal. An impeller assembly 6 is provided in the pump body 100, and the motor shaft 2 passes through the mechanical seal 5 in the organic sealing end cover 3 and extends into the pump body 100. The motor shaft 2 is connected to the impeller assembly 6. The pump body 100 has a water inlet 7 and a water outlet 8. The motor shaft 2 drives the impeller assembly 6 to rotate, so that water is sucked in from the water inlet 7 and discharged from the water outlet 8.

[0026] In order to achieve water cooling of the motor 200, a water cooling hood 9 is provided on the outside of the motor housing 1, and a water cooling channel 10 is formed between the water cooling hood 9 and the motor housing 1. A cooling water inlet 11 and a cooling water outlet 12 are provided on the water cooling hood 9. The cooling water inlet 11 and the cooling water outlet 12 are used to allow cooling water to enter and warm water to be discharged after absorbing heat, so that the heat generated during the operation of the motor 200 can be discharged in time to avoid the danger of overheating of the motor 200. The motor cavity is the space inside the motor housing 1.

[0027] In order to realize the cooling of the mechanical seal, a mechanical seal flushing pipeline 13 is provided on the mechanical seal end cover 3, one end of the mechanical seal flushing pipeline 13 is connected to the mechanical seal end cover 3 and communicated with the mechanical seal cavity 4, and the other end of the mechanical seal flushing pipeline 13 is connected to the pump body 100 and communicated with the water inlet 7, so as to form a circulation flow channel between the pump body water inlet 7 and the mechanical seal cavity 4. Under the high speed of the high-speed pump, the dynamic and static rings of the mechanical seal 5 have intense friction and generate a large amount of heat. The mechanical seal flushing pipeline 13 can timely guide the high-temperature water in the mechanical seal cavity 4, and the normal temperature water in the pump body 100 can re-enter the mechanical seal cavity 4 to cool the mechanical seal, thereby ensuring the stability and reliability of the entire high-speed pump.

[0028] A regulating valve 14 is provided on the mechanical seal flushing pipeline 13, and a limiting flow hole is provided in the middle of the regulating valve 14. The aperture size of the limiting flow hole is adjusted by adjusting the opening of the regulating valve 14. Within a certain range, the larger the aperture of the limiting flow hole, the greater the flow rate of the mechanical seal flushing pipeline 13.

[0029] Reference Figure 3As shown, a high-speed pump cooling joint control system of the present application includes a temperature acquisition module, a cooling water flow control module, a joint control module and a regulating valve opening control module. The temperature acquisition module is used to collect the motor cavity temperature and the machine seal cavity temperature, and then the joint control module adjusts the cooling water flow of the motor water cooling through the cooling water flow control module, and the regulating valve opening control module adjusts the regulating valve opening of the machine seal flushing, thereby realizing the joint control of the motor 200 cooling and the machine seal cooling, thereby avoiding the motor cavity temperature being too high to affect the machine seal, and the machine seal cavity 4 temperature being too high to affect the motor cavity, so as to increase the service life of the high-speed pump.

[0030] Specifically, the temperature acquisition module is used to collect the motor cavity temperature and the machine sealing cavity temperature. The temperature acquisition module includes a motor temperature sensor and a pump body temperature sensor. There are multiple motor temperature sensors, and the multiple motor temperature sensors respectively collect temperature data of various parts of the motor 200. The motor temperature sensor is placed in the motor cavity to collect the motor cavity temperature. The motor temperature sensor is placed in the cooling water inlet 11 of the water cooling cover 9 to collect the cooling water inlet temperature.

[0031] There are multiple pump body temperature sensors, one of which is placed in the water inlet 7 of the pump body 100 to collect the temperature of the water inlet 7 of the pump body 100, and one of which is placed in the machine sealing chamber 4 to collect the temperature of the machine sealing chamber.

[0032] Among them, the motor cavity temperature and the machine seal cavity temperature are both temperature data collected in real time.

[0033] The temperature acquisition module is electrically connected to the joint control module, and the cooling water flow control module and the regulating valve opening control module are electrically connected to the joint control module. The joint control module is used to obtain the motor cavity temperature and the machine seal cavity temperature, and output joint control signals to the cooling water flow control module and the regulating valve opening control module.

[0034] The cooling water flow control module adjusts the cooling water flow of the motor water cooling based on the joint control signal, and the regulating valve opening control module adjusts the regulating valve opening of the machine seal flushing based on the joint control signal.

[0035] The cooling water flow control module adjusts the cooling water flow of the motor cooling according to the cooling water flow control formula based on the acquired joint control signal. The cooling water flow control module includes a cooling water flow controller and a cooling water flow control water pump, the water inlet of the cooling water flow control water pump is connected to the cooling water source, the water outlet of the cooling water flow control water pump is connected to the cooling water inlet 11 of the water cooling cover 9, and the cooling water flow controller is electrically connected to the cooling water flow control water pump, thereby realizing the cooling water flow control of the motor water cooling.

[0036] The cooling water flow control formula is configured in the cooling water flow controller, and the cooling water flow controller is electrically connected to the joint control module, and the cooling water flow control formula is used to implement control based on the joint control signal.

[0037] Specifically, the cooling water flow control formula is as follows: Q 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )), T 机 ≤T 3 ; Q 1 =bP((2T 机 -T 2 ) / T 2 )(1-η) / (KL 厚 (T 电 -T 水 )), T 机 >T 3 ; In the formula, Q 1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the motor input power, η is the motor efficiency, K is the thermal conductivity of the motor housing material, L 厚 is the equivalent thickness of the motor housing, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the temperature of the sealing chamber, T 3 Set the rated temperature for the machine seal chamber.

[0038] It is worth noting that in T 机 ≤T 3 In the case of 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )), in T 机 >T 3 In the case of the above, it indicates that the temperature of the mechanical seal cavity 4 is too high, which may affect the motor cavity, so it is necessary to increase the cooling water flow rate of the motor water cooling. The cooling water flow control module uses the cooling water flow control formula (2T 机 -T 2 ) / T 2 ) times to adjust the cooling water flow rate for motor cooling, so the cooling water flow rate control formula is Q 1 =bP((2T 机 -T 2 ) / T 2 )(1-η) / (KL 厚 (T 电 -T 水 )).

[0039] The regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing based on the acquired joint control signal using the regulating valve opening control formula. The regulating valve opening control module is electrically connected to the regulating valve, the regulating valve opening control formula is configured in the regulating valve opening control module, the regulating valve opening control module is electrically connected to the joint control module, and the regulating valve opening control formula is used to control the opening of the regulating valve based on the joint control signal.

[0040] Specifically, the control formula of the regulating valve opening is as follows: In the formula, D is the opening of the regulating valve, f is the friction coefficient of the contact surface between the dynamic and static rings, and p e is the contact surface load ratio of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, A is the contact surface area of ​​the dynamic and static rings, a is the correction coefficient, C e is the flow coefficient of the regulating valve limiting hole, ρ is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal chamber and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, T 2 Set the rated temperature for the motor cavity.

[0041] It is worth noting that in T 电 ≤T 2 In the case of, the control formula of the regulating valve opening is In T 电 >T 2 In the case of the motor cavity temperature is too high may affect the mechanical seal cavity, so it is necessary to increase the mechanical seal flushing regulating valve opening, regulating valve opening control module to adjust the valve opening control formula T 电 >T 2 The opening of the regulating valve for mechanical seal flushing is adjusted by times, so the control formula for the opening of the regulating valve is:

[0042] Among them, the formula for friction heat per unit time of mechanical seal is as follows: Q 机 =fp e vA; Where, f is the friction coefficient of the contact surface between the moving and static rings, p e is the contact surface specific load of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, and A is the contact surface area of ​​the dynamic and static rings; The required flushing flow rate of the seal is calculated according to the formula of friction heat per unit time of the mechanical seal. The formula of flushing flow rate required by the mechanical seal is as follows: In the formula, Q 2 is the volume flow rate of the medium in the mechanical seal flushing pipeline, ρ is the density of the conveying medium, C is the specific heat of the medium, and T is the temperature difference between the mechanical seal cavity and the water inlet of the pump body; The formula for the flushing flow rate required for the mechanical seal is deduced by the dimensionless method to obtain the regulating valve opening control formula.

[0043] The working process of the high-speed pump cooling joint control system is described as follows: The temperature acquisition module collects the motor cavity temperature and the machine seal cavity temperature in real time.

[0044] First, the joint control module determines whether the motor cavity temperature is greater than the set rated temperature T 2 .

[0045] If the motor cavity temperature is greater than the motor cavity set rated temperature T 2 The cooling water flow control module is based on the cooling water flow control formula Q 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )) Adjust the cooling water flow rate for motor cooling and adjust the valve opening control module to adjust the valve opening control formula (T 电 / T 2 ) times, that is Adjust the opening of the regulating valve for mechanical seal flushing, where T 2 Set the rated temperature for the motor cavity, T 电 is the motor cavity temperature.

[0046] If the motor cavity temperature is lower than the motor cavity set rated temperature T 2 The cooling water flow control module is based on the cooling water flow control formula Q 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )) Adjust the cooling water flow of the motor cooling, the regulating valve opening control module is based on the regulating valve opening control formula Adjust the opening of the regulating valve for mechanical seal flushing.

[0047] Secondly, the joint control module makes a judgment based on the temperature of the machine sealing chamber 4 to determine whether the temperature of the machine sealing chamber 4 is greater than the set rated temperature T of the machine sealing chamber. 3 .

[0048] If the temperature of the machine seal cavity is greater than the set rated temperature T 3 The regulating valve opening control module uses the regulating valve opening control formula in the above steps to adjust the regulating valve opening of the mechanical seal flushing. The cooling water flow control module uses the cooling water flow control formula (2T 机 -T 2 ) / T 2 ) times to adjust the cooling water flow rate for motor cooling, i.e. Q 1 =bP((2T 机 -T 2) / T 2 )(1-η) / (KL 厚 (T 电 -T 水 )) Adjust the cooling water flow rate for motor cooling, where T 机 is the temperature of the sealing chamber, T 2 Set the rated temperature for the motor cavity.

[0049] If the temperature of the sealing chamber is lower than the set rated temperature T 3 The cooling water flow control module uses the cooling water flow control formula in the above steps to adjust the cooling water flow for motor cooling, and the regulating valve opening control module uses the regulating valve opening control formula in the above steps to adjust the regulating valve opening for machine seal flushing.

[0050] Embodiment 2 A method for applying the high-speed pump cooling joint control system as described in the above technical solution, referring to Figure 4 As shown, the following steps are included: Step S100, collecting the motor cavity temperature and the machine seal cavity temperature in real time; Step S200, outputting a joint control signal to a cooling water flow control module and a regulating valve opening control module based on the motor cavity temperature, adjusting the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing; Step S300: outputting a joint control signal to a cooling water flow control module and a regulating valve opening control module based on the temperature of the machine seal chamber, so as to adjust the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing.

[0051] In step S200, the following steps are included: Based on the motor cavity temperature, determine whether the motor cavity temperature is greater than the set rated temperature T 2 ; If the motor cavity temperature is greater than the motor cavity set rated temperature T 2 The cooling water flow control module adjusts the cooling water flow of the motor cooling based on the cooling water flow control formula, and the regulating valve opening control module adjusts the valve opening control formula (T 电 / T 2 ) times to adjust the opening of the regulating valve for mechanical seal flushing, where T 2 Set the rated temperature for the motor cavity, T 电 is the motor cavity temperature; If the motor cavity temperature is lower than the motor cavity set rated temperature T 2 The cooling water flow control module adjusts the cooling water flow for motor cooling based on the cooling water flow control formula, and the regulating valve opening control module adjusts the regulating valve opening for machine seal flushing based on the regulating valve opening control formula.

[0052] In step S300, the following steps are included: Based on the temperature of the machine sealing chamber, determine whether the temperature of the machine sealing chamber is greater than the set rated temperature T of the machine sealing chamber. 3 ; If the temperature of the machine seal cavity is greater than the set rated temperature T 3 The regulating valve opening control module adjusts the regulating valve opening of the mechanical seal flushing based on step S200, that is, the regulating valve opening control module uses the regulating valve opening control formula in the above step S200 to adjust the regulating valve opening of the mechanical seal flushing, and the cooling water flow control module uses the cooling water flow control formula (2T 机 -T 2 ) / T 2 ) times to adjust the cooling water flow rate for motor cooling, where T 机 is the temperature of the sealing chamber, T 2 Set a rated temperature for the motor cavity; If the temperature of the sealing chamber is lower than the set rated temperature T 3 The cooling water flow control module adjusts the cooling water flow for cooling the motor based on step S200, that is, the cooling water flow control module uses the cooling water flow control formula in the above step S200 to adjust the cooling water flow for cooling the motor; The regulating valve opening control module adjusts the regulating valve opening of the mechanical seal flushing based on step S200, that is, the regulating valve opening control module uses the regulating valve opening control formula in the above step S200 to adjust the regulating valve opening of the mechanical seal flushing.

[0053] Among them, the cooling water flow control formula is as follows: Q 1 =bP(1-η) / (KL 厚 (T 电 -T 水 )), T 机 ≤T 3 ; Q 1 =bP((2T 机 -T 2 ) / T 2 )(1-η) / (KL 厚 (T 电 -T 水 )), T 机 >T 3 ; In the formula, Q 1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the motor input power, η is the motor efficiency, K is the thermal conductivity of the motor housing material, L 厚 is the equivalent thickness of the motor housing, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机is the temperature of the sealing chamber, T 3 To set the rated temperature.

[0054] Among them, the control formula of the regulating valve opening is as follows: Where, f is the friction coefficient of the contact surface between the moving and static rings, p e is the contact surface load ratio of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, A is the contact surface area of ​​the dynamic and static rings, a is the correction coefficient, C e is the flow coefficient of the regulating valve limiting hole, ρ is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal chamber and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, T 2 To set the rated temperature.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-speed pump cooling joint control system, characterized in that: It includes a temperature acquisition module, a cooling water flow control module, a joint control module and a regulating valve opening control module; The temperature acquisition module is used to collect the motor cavity temperature and the machine sealing cavity temperature; The joint control module is used to obtain the motor cavity temperature and the machine seal cavity temperature, and output a joint control signal to the cooling water flow control module and the regulating valve opening control module; The cooling water flow control module adjusts the cooling water flow of the motor water cooling based on the joint control signal; The regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing based on the joint control signal.

2. A high-speed pump cooling joint control system according to claim 1, characterized in that: The cooling water flow control module adjusts the cooling water flow for cooling the motor according to the cooling water flow control formula based on the acquired joint control signal.

3. A high-speed pump cooling joint control system according to claim 2, characterized in that: The cooling water flow control formula is as follows: Q1=bP(1-η) / (KL 厚 ((T 电 -T 水 ))),T 机 ≤T3; Q1=bP((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )),T 机 >T3; Where Q1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the motor input power, η is the motor efficiency, K is the thermal conductivity of the motor housing material, L 厚 is the equivalent thickness of the motor housing, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the temperature of the machine sealing chamber, and T3 is the rated temperature set for the machine sealing chamber.

4. A high-speed pump cooling joint control system according to claim 1, characterized in that: The regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing according to the obtained joint control signal using a regulating valve opening control formula.

5. A high-speed pump cooling joint control system according to claim 4, characterized in that: The control formula of the regulating valve opening is as follows: In the formula, D is the opening of the regulating valve, f is the friction coefficient of the contact surface between the dynamic and static rings, and p e is the contact surface load ratio of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, A is the contact surface area of ​​the dynamic and static rings, a is the correction coefficient, C e is the flow coefficient of the regulating valve limiting hole, ρ is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal chamber and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, and T2 is the rated temperature set for the motor cavity.

6. A high-speed pump cooling joint control system according to claim 5, characterized in that: The mechanical seal friction heat per unit time formula is as follows: Q 机 =fp e vA; Where, f is the friction coefficient of the contact surface between the moving and static rings, p e is the contact surface specific load of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, and A is the contact surface area of ​​the dynamic and static rings; The required flushing flow rate of the seal is calculated according to the formula of friction heat per unit time of the mechanical seal. The formula of flushing flow rate required by the mechanical seal is as follows: In the formula, Q2 is the volume flow rate of the medium in the mechanical seal flushing pipeline, ρ is the density of the conveying medium, C is the specific heat of the medium, and T is the temperature difference between the mechanical seal cavity and the water inlet of the pump body; The formula for the flushing flow rate required for the mechanical seal is deduced by the dimensionless method to obtain the regulating valve opening control formula.

7. A method for applying the high-speed pump cooling joint control system according to any one of claims 1 to 6, characterized in that: The steps include: Step S100, collecting the motor cavity temperature and the machine seal cavity temperature in real time; Step S200, outputting a joint control signal to a cooling water flow control module and a regulating valve opening control module based on the motor cavity temperature, adjusting the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing; Step S300: outputting a joint control signal to a cooling water flow control module and a regulating valve opening control module based on the temperature of the machine seal chamber, so as to adjust the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing.

8. A high-speed pump cooling joint control system according to claim 5, characterized in that: In step S200, the following steps are included: Based on the motor cavity temperature, determine whether the motor cavity temperature is greater than the set rated temperature T2; If the motor cavity temperature is greater than the motor cavity set rated temperature T2, the cooling water flow control module adjusts the cooling water flow rate of the motor cooling based on the cooling water flow control formula, and the regulating valve opening control module adjusts the valve opening control formula (T 电 / T2) times to adjust the opening of the regulating valve for mechanical seal flushing, where T2 is the rated temperature set for the motor cavity, T 电 is the motor cavity temperature; If the motor cavity temperature is lower than the set rated temperature T2 of the motor cavity, the cooling water flow control module adjusts the cooling water flow for motor cooling based on the cooling water flow control formula, and the regulating valve opening control module adjusts the regulating valve opening for machine seal flushing based on the regulating valve opening control formula.

9. A high-speed pump cooling joint control system according to claim 8, characterized in that: In step S300, the following steps are included: Based on the temperature of the machine sealing cavity, determine whether the temperature of the machine sealing cavity is greater than the set rated temperature T3 of the machine sealing cavity; If the temperature of the machine seal chamber is greater than the set rated temperature T3 of the machine seal chamber, the regulating valve opening control module adjusts the regulating valve opening of the machine seal flushing based on step S200, and the cooling water flow control module uses the cooling water flow control formula (2T 机 -T2) / T2) times to adjust the cooling water flow rate of the motor cooling, where T 机 is the temperature of the machine seal cavity, T2 is the rated temperature set for the motor cavity; If the machine seal chamber temperature is lower than the set rated temperature T3 of the machine seal chamber, the cooling water flow control module adjusts the cooling water flow for motor cooling based on step S200, and the regulating valve opening control module adjusts the regulating valve opening for machine seal flushing based on step S200.

10. A high-speed pump cooling joint control system according to claim 5, characterized in that: The cooling water flow control formula is as follows: Q1=bP(1-η) / (KL 厚 ((T 电 -T 水 )),T 机 ≤T3; Q1=bP((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 ))),T 机 >T3; Where Q1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the motor input power, η is the motor efficiency, K is the thermal conductivity of the motor housing material, L 厚 is the equivalent thickness of the motor housing, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the temperature of the machine sealing chamber, T3 is the set rated temperature; The control formula of the regulating valve opening is as follows: Where, f is the friction coefficient of the contact surface between the moving and static rings, p e is the contact surface load ratio of the dynamic and static rings, v is the average linear velocity of the contact surface of the dynamic and static rings, A is the contact surface area of ​​the dynamic and static rings, a is the correction coefficient, C e is the flow coefficient of the regulating valve limiting hole, ρ is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal chamber and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, T2 is the set rated temperature.

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