A high-speed pump cooling joint control system and a method for its application

Abstract

The application relates to a high-speed pump cooling joint control system and a method for application thereof, which comprises a temperature acquisition module, a cooling water flow control module, a joint control module and a regulating valve opening degree control module; the temperature acquisition module is used for acquiring motor cavity temperature and mechanical seal cavity temperature; the joint control module is used for acquiring the motor cavity temperature and the mechanical seal cavity temperature, and outputs a joint control signal to the cooling water flow control module and the regulating valve opening degree control module; the cooling water flow control module adjusts the cooling water flow of motor water cooling based on the joint control signal; and the regulating valve opening degree control module adjusts the regulating valve opening degree of mechanical seal flushing based on the joint control signal. The application realizes joint control of motor cooling and mechanical seal cooling, avoids the influence of high motor cavity temperature on the mechanical seal and the influence of high mechanical seal cavity temperature on the motor cavity, and improves the service life of the high-speed pump.

Description

TECHNICAL FIELD

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

[0002] The high-speed pump is a kind of pump equipment that realizes high-efficiency conveying through high rotation speed, and is widely used in the fields of petroleum chemical industry, aerospace, energy power, etc. Because of the high rotation speed of the high-speed pump, overheating is prone to occur at the motor and mechanical seal positions of the high-speed pump, so the motor and mechanical seal need to be cooled to prevent overheating.

[0003] The cooling of the motor is usually in the form of water cooling. For example, a water-cooled motor shell for an automobile is disclosed in Chinese Patent No. 20161071869618, which comprises a water jacket that is detachably installed on the motor shell, and an inlet and an outlet are arranged on the water jacket to cool the motor shell.

[0004] The cooling of the mechanical seal is usually in the form of mechanical seal flushing. For example, a mechanical seal flushing device for a centrifugal pump is disclosed in Chinese Patent No. 2016106037352, which comprises a mechanical seal flushing pipeline connected between the mechanical seal cavity of the pump body and the water inlet of the pump body, and the mechanical seal is cooled by flowing water flushing.

[0005] According to the related technology in the above, the inventors believe that although the above-mentioned technology realizes the cooling of the motor shell and the mechanical seal, the overheating of the motor shell will affect the operation of the mechanical seal, and the overheating of the mechanical seal will also affect the operation of the motor, and the existing high-speed pump does not have a joint control mode for the cooling of the motor shell and the mechanical seal. SUMMARY

[0006] In order to realize the joint control of the cooling of the motor shell and the mechanical seal, the present application provides a high-speed pump cooling joint control system and a method for application thereof.

[0007] The high-speed pump cooling joint control system provided by the present application adopts the following technical solution:

[0008] 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 degree control module.

[0009] The temperature acquisition module is used to acquire the motor cavity temperature and the mechanical seal cavity temperature.

[0010] The joint control module is used to acquire the motor cavity temperature and the mechanical seal cavity temperature, and output a joint control signal to the cooling water flow control module and the regulating valve opening degree control module.

[0011] The cooling water flow control module adjusts the cooling water flow of the motor water cooling based on the joint control signal.

[0012] The regulating valve opening degree control module adjusts the regulating valve opening degree of the seal flush based on the obtained joint control signal.

[0013] Preferably, the cooling water flow control module adjusts the cooling water flow of the motor cooling based on the obtained joint control signal according to a cooling water flow control formula.

[0014] Preferably, the cooling water flow control formula ① is as follows:

[0015] Q1 = bP 输入 ((1 - η) / (KL 厚 (T 电 - T 水 )), T 机 ≤ T3

[0016] The cooling water flow control formula ② is as follows:

[0017] Q1 = bP 输入 ((2T 机 - T2) / T2) (1 - η) / (KL 厚 (T 电 - T 水 )), T 机 > T3

[0018] In the formula, Q1 is the cooling water flow, b is the equivalent width of the water cooling channel, P 输入 is the input power of the motor, η is the efficiency of the motor, K is the thermal conductivity coefficient of the motor shell material, L 厚 is the equivalent thickness of the motor shell, T 电 is the temperature of the motor cavity, T 水 is the temperature of the cooling water inlet, T 机 is the temperature of the seal cavity, and T3 is the set rated temperature of the seal cavity.

[0019] Preferably, the regulating valve opening degree control module adjusts the regulating valve opening degree of the seal flush based on the obtained joint control signal according to a regulating valve opening degree control formula.

[0020] Preferably, the regulating valve opening degree control formula ① is as follows:

[0021]

[0022] The regulating valve opening degree control formula ② is as follows:

[0023]

[0024] In the formula, D is the regulating valve opening degree, f is the friction coefficient of the dynamic-static ring contact surface, p ef is the friction coefficient of the dynamic and static ring contact surface, p is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the machine seal cavity and the pump body inlet, P is the pressure difference before and after the regulating valve, T e f is the friction coefficient of the dynamic and static ring contact surface, p is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the machine seal cavity and the pump body inlet, P is the pressure difference before and after the regulating valve, T 电 T1 is the temperature of the motor cavity, and T2 is the set rated temperature of the motor cavity.

[0025] Preferably, the machine seal friction heat per unit time formula is as follows:

[0026] Q 机 = f p v A e ;

[0027] In the formula, f is the friction coefficient of the dynamic and static ring contact surface, p is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the machine seal cavity and the pump body inlet, P is the pressure difference before and after the regulating valve, T e is the specific heat of the medium, T is the temperature difference between the machine seal cavity and the pump body inlet, and P is the pressure difference before and after the regulating valve.

[0028] The machine seal required flushing flow is calculated according to the machine seal friction heat per unit time formula, and the machine seal required flushing flow formula is as follows:

[0029]

[0030] In the formula, Q2 is the medium volume flow in the machine seal flushing pipeline, p is the density of the conveying medium, C is the specific heat of the medium, and T is the temperature difference between the machine seal cavity and the pump body inlet.

[0031] The machine seal required flushing flow formula is obtained by dimensionless method reasoning.

[0032] The high-speed pump cooling joint control method provided in the application adopts the technical scheme as follows:

[0033] A method for applying the high-speed pump cooling joint control system according to the above technical scheme, comprising the following steps:

[0034] Step S100, real-time acquisition of the motor cavity temperature and the machine seal cavity temperature;

[0035] Step S200, output of a joint control signal to the cooling water flow control module and the regulating valve opening control module based on the motor cavity temperature, adjustment of the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing;

[0036] Step S300, output of a joint control signal to the cooling water flow control module and the regulating valve opening control module based on the machine seal cavity temperature, adjustment of the cooling water flow of the motor water cooling and the regulating valve opening of the machine seal flushing.

[0037] Preferably, in step S200, the following steps are included:

[0038] determining whether the motor cavity temperature is greater than a set rated temperature T2 based on the motor cavity temperature;

[0039] 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 for motor cooling based on the cooling water flow control formula ①, and the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on the regulating valve opening degree control formula ②, wherein T2 is the motor cavity set rated temperature, T 电 is the motor cavity temperature;

[0040] If the motor cavity temperature is less than the motor cavity set rated temperature T2, the cooling water flow control module adjusts the cooling water flow for motor cooling based on the cooling water flow control formula ①, and the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on the regulating valve opening degree control formula ①.

[0041] Preferably, in step S300, the following steps are included:

[0042] determining whether the seal cavity temperature is greater than a seal cavity set rated temperature T3 based on the seal cavity temperature;

[0043] If the seal cavity temperature is greater than the seal cavity set rated temperature T3, the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on step S200, and the cooling water flow control module adjusts the cooling water flow for motor cooling based on the cooling water flow control formula ②, wherein T 机 is the seal cavity temperature, and T2 is the motor cavity set rated temperature;

[0044] If the seal cavity temperature is less than the seal cavity set rated temperature T3, the cooling water flow control module adjusts the cooling water flow for motor cooling based on step S200, and the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on step S200.

[0045] Preferably, the cooling water flow control formula ① is as follows:

[0046] Q1 = bP 输入 (1-η) / (KL 厚 (T 电 -T 水 )), T 机 ≤ T3;

[0047] The cooling water flow control formula ② is as follows:

[0048] Q1 = bP 输入 ((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )), T 机 > T3;

[0049] In the formula, Q1 is the cooling water flow, 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 shell material, L 厚 is the equivalent thickness of the motor shell, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the mechanical seal cavity temperature, and T3 is the set rated temperature.

[0050] The control formula ① of the regulating valve opening degree is as follows:

[0051]

[0052] The control formula ② of the regulating valve opening degree is as follows:

[0053]

[0054] In the formula, f is the friction coefficient of the dynamic and static ring contact surface, p e is the specific load of the dynamic and static ring contact surface, v is the average linear velocity of the dynamic and static ring contact surface, A is the area of the dynamic and static ring contact surface, a is the correction coefficient, C e is the flow coefficient of the regulating valve flow 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 cavity and the pump body water inlet, P is the pressure difference before and after the regulating valve, T 电 is the motor cavity temperature, and T2 is the set rated temperature.

[0055] In summary, the present application includes at least one of the following beneficial technical effects:

[0056] The present application collects the motor cavity temperature and the mechanical 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 adjusts the opening degree of the regulating valve of the mechanical seal flushing through the regulating valve opening degree control module, so as to realize the joint control of the motor cooling and the mechanical seal cooling, thereby avoiding the influence of the motor cavity temperature being too high on the mechanical seal and the influence of the mechanical seal cavity temperature being too high on the motor cavity, and providing the service life of the high-speed pump. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 is a structural schematic diagram of a high-speed pump.

[0058] Figure 2 is a sectional view schematic diagram of a high-speed pump.

[0059] Figure 3 is a system block diagram of a high-speed pump cooling joint control system.

[0060] Figure 4 is a method block diagram of a high-speed pump cooling joint control method.

[0061] Explanation of reference signs: 100, pump body; 200, motor; 1, motor shell; 2, motor shaft; 3, mechanical seal end cover; 4, mechanical seal cavity; 5, mechanical seal; 6, impeller assembly; 7, water inlet; 8, water outlet; 9, water cooling cover; 10, water cooling flow channel; 11, cooling water inlet; 12, cooling water outlet; 13, mechanical seal flushing pipeline; 14, regulating valve. DETAILED DESCRIPTION

[0062] The following will be described in detail below with reference to the accompanying drawings Figures 1-4 Further detailed description will be made to the present application.

[0063] Example one

[0064] A high-speed pump cooling joint control system, as shown in Figure 1 and Figure 2 is applied in a high-speed pump, which comprises a pump body 100 and a motor 200 installed on the pump body 100, the motor 200 comprises a motor shell 1 and a motor shaft 2 rotatably arranged in the motor shell 1, the inner wall of the motor shell 1 is provided with a stator winding, and the motor shaft 2 is provided with a rotor assembly matched with the stator winding.

[0065] An end of the motor shell 1 is provided with a mechanical seal end cover 3, the mechanical seal end cover 3 is provided with a mechanical seal cavity 4, the mechanical seal cavity 4 is provided with a mechanical seal 5, the mechanical seal 5 is hereinafter referred to as a mechanical seal, the pump body 100 is provided with an impeller assembly 6, the motor shaft 2 extends into the pump body 100 through the mechanical seal 5 in the mechanical seal end cover 3, the motor shaft 2 is connected to the impeller assembly 6, the pump body 100 is provided with a water inlet 7 and a water outlet 8, the motor shaft 2 drives the impeller assembly 6 to rotate, so as to realize the suction of water from the water inlet 7 and the discharge of water from the water outlet 8.

[0066] In order to realize the water cooling of the motor 200, the outer side of the motor shell 1 is provided with a water cooling cover 9, the water cooling cover 9 and the motor shell 1 form a water cooling flow channel 10 therebetween, the water cooling cover 9 is provided with a cooling water inlet 11 and a cooling water outlet 12, the cooling water inlet 11 and the cooling water outlet 12 realize the entry of cooling water and the discharge of heated water, so as to timely discharge the heat generated in the operation process of the motor 200, avoid the overheat of the motor 200 and the occurrence of danger, and the motor cavity is a space inside the motor shell 1.

[0067] In order to realize the cooling of the mechanical seal, the mechanical seal flushing pipe 13 is arranged on the mechanical seal end cover 3, one end of the mechanical seal flushing pipe 13 is connected with the mechanical seal end cover 3 and communicates with the mechanical seal cavity 4, the other end of the mechanical seal flushing pipe 13 is connected with the pump body 100 and communicates with the water inlet 7, so as to form a circulating flow channel between the pump body water inlet 7 and the mechanical seal cavity 4. At high speed of the high-speed pump, the dynamic and static rings of the mechanical seal 5 rub fiercely, a large amount of heat is generated, the mechanical seal flushing pipe 13 can timely lead out 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, so as to ensure the stability and reliability of the entire high-speed pump.

[0068] The adjusting valve 14 is arranged on the mechanical seal flushing pipe 13, the middle of the adjusting valve 14 is provided with a flow limiting hole, by adjusting the opening of the adjusting valve 14, that is, adjusting the aperture size of the flow limiting hole, within a certain range, the larger the aperture size of the flow limiting hole, the greater the flow of the mechanical seal flushing pipe 13.

[0069] Referring to Figure 3 The cooling joint control system of the high-speed pump provided by the application comprises a temperature acquisition module, a cooling water flow control module, a joint control module and an adjusting valve opening control module, the motor cavity temperature and the mechanical seal cavity temperature are acquired through the temperature acquisition module, then the joint control module adjusts the cooling water flow of the motor water cooling through the cooling water flow control module, the adjusting valve opening control module adjusts the adjusting valve opening of the mechanical seal flushing, so as to realize the joint control of the motor 200 cooling and the mechanical seal cooling, thereby avoiding the influence of the motor cavity temperature being too high on the mechanical seal and the influence of the mechanical seal cavity 4 temperature being too high on the motor cavity, so as to provide the service life of the high-speed pump.

[0070] Specifically, the temperature acquisition module is used for acquiring the motor cavity temperature and the mechanical seal cavity temperature, the temperature acquisition module comprises a motor temperature sensor and a pump body temperature sensor, the motor temperature sensor is provided in plurality, the plurality of motor temperature sensors respectively acquire the temperature data of each part of the motor 200, the motor temperature sensor is placed into the motor cavity to acquire the motor cavity temperature, and the motor temperature sensor is placed into the cooling water inlet 11 of the water cooling cover 9 to acquire the cooling water inlet temperature.

[0071] The pump body temperature sensor is provided in plurality, one of the pump body temperature sensors is placed into the pump body 100 water inlet 7 to acquire the pump body 100 water inlet 7 temperature, and one of the pump body temperature sensors is placed into the mechanical seal cavity 4 to acquire the mechanical seal cavity temperature.

[0072] The motor cavity temperature and the mechanical seal cavity temperature are both real-time acquired temperature data.

[0073] The temperature acquisition module is electrically connected to the joint control module, and the cooling water flow control module and the regulating valve opening degree control module are electrically connected to the joint control module, and the joint control module is used to acquire the motor cavity temperature and the mechanical seal cavity temperature, and outputs a joint control signal to the cooling water flow control module and the regulating valve opening degree control module.

[0074] 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 degree control module adjusts the regulating valve opening degree of the mechanical seal flushing based on the joint control signal.

[0075] The cooling water flow control module adjusts the cooling water flow of the motor cooling based on the acquired joint control signal according to a cooling water flow control formula. The cooling water flow control module comprises 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 a 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, so as to realize the cooling water flow control of the motor water cooling.

[0076] The cooling water flow control formula is configured in the cooling water flow controller, the cooling water flow controller is electrically connected to the joint control module, and the control is implemented according to the cooling water flow control formula based on the joint control signal.

[0077] Specifically, the cooling water flow control formula ① is as follows:

[0078]

[0079] The cooling water flow control formula ② is as follows:

[0080] Q1=bP 输入 ((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )),T 机 >T3;

[0081] In the formula, Q1 is the cooling water flow, b is the equivalent width of the water cooling flow channel, P 输入 is the input power of the motor, η is the efficiency of the motor, K is the thermal conductivity coefficient of the motor shell material, L 厚 is the equivalent thickness of the motor shell, T 电 is the motor cavity temperature, T 水 is the cooling water inlet temperature, T 机 is the mechanical seal cavity temperature, and T3 is the set rated temperature of the mechanical seal cavity.

[0082] It is worth noting that in the case of T 机 ≤T3, the cooling water flow control formula ① is Q1=bP 输入 (1-η) / (KL厚 (T 电 -T 水 )), in T 机 In the case of T3, it indicates that the temperature of the mechanical seal cavity 4 is too high, which may affect the motor cavity. Therefore, it is necessary to increase the cooling water flow rate of the motor water cooling system. The cooling water flow control module adjusts the cooling water flow rate of the motor cooling system using cooling water flow control formula ②. Therefore, cooling water flow control formula ② is Q1 = bP. 输入 ((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )).

[0083] The regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing based on the acquired control signal and the regulating valve opening control formula. The regulating valve opening control module is electrically connected to the regulating valve, and the regulating valve opening control formula is configured within the module. The regulating valve opening control module is also electrically connected to the control module, and controls the opening of the regulating valve based on the control signal and the regulating valve opening control formula.

[0084] Specifically, the formula for controlling the opening of the regulating valve ① is as follows:

[0085]

[0086] The formula for controlling the opening of the regulating valve is as follows:

[0087]

[0088] In the formula, D is the opening degree of the regulating valve, f is the friction coefficient of the contact surface between the moving and stationary rings, and p e Let v be the specific load on the contact surface of the moving and stationary rings, v be the average linear velocity of the contact surface of the moving and stationary rings, A be the contact area of ​​the moving and stationary rings, a be the correction factor, and C be the load on the contact surface of the moving and stationary rings. e The flow coefficient of the regulating valve's flow restrictor is given by: ρ, density of the conveyed medium; C, specific heat of the medium; T, temperature difference between the mechanical seal cavity and the pump inlet; P, pressure difference across the regulating valve; and T0. 电 T1 represents the motor cavity temperature, and T2 represents the set rated temperature of the motor cavity.

[0089] It is worth noting that in T 电 When T2 is less than or equal to 2, the control formula for the valve opening is ①. In T 电 In case T2, the excessively high temperature in the motor cavity may affect the mechanical seal cavity, thus requiring an increase in the opening of the regulating valve for mechanical seal flushing. The regulating valve opening control module adjusts the opening of the regulating valve for mechanical seal flushing using regulating valve opening control formula ②. Therefore, regulating valve opening control formula ② is...

[0090] Wherein, the machine seal unit time friction heat formula is as follows:

[0091] Q 机 = fp e vA;

[0092] In the formula, f is the dynamic static ring contact surface friction coefficient, p e is the dynamic static ring contact surface specific load, v is the dynamic static ring contact surface average linear velocity, A is the dynamic static ring contact surface area;

[0093] According to the machine seal unit time friction heat formula, the machine seal required flushing flow is calculated, and the machine seal required flushing flow formula is as follows:

[0094]

[0095] In the formula, Q2 is the medium volume flow in the machine seal flushing pipeline, p is the density of the conveying medium, C is the specific heat of the medium, and T is the temperature difference between the machine seal cavity and the pump body water inlet;

[0096] The machine seal required flushing flow formula is obtained by dimensionless method reasoning.

[0097] The working process of the high-speed pump cooling joint control system is described as follows:

[0098] The temperature acquisition module acquires the motor cavity temperature and the machine seal cavity temperature in real time.

[0099] Firstly, the joint control module judges whether the motor cavity temperature is greater than the set rated temperature T2 based on the motor cavity temperature.

[0100] 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 of the motor cooling based on the cooling water flow control formula ① Q1=bP 输入 (1-η) / (KL 厚 (T 电 -T 水 )), and the adjusting valve opening degree control module adjusts the adjusting valve opening degree control formula ②, that is, adjusts the adjusting valve opening degree of the machine seal flushing, wherein T2 is the motor cavity set rated temperature, and T 电 is the motor cavity temperature.

[0101] If the motor cavity temperature is less than the motor cavity set rated temperature T2, the cooling water flow control module adjusts the cooling water flow of the motor cooling based on the cooling water flow control formula ① Q1=bP 输入 (1-η) / (KL 厚 (T 电 -T 水 )), and the adjusting valve opening degree control module adjusts the adjusting valve opening degree control formula ① Adjusting the opening of the regulating valve for the seal flush.

[0102] Secondly, the joint control module judges whether the temperature of the seal cavity 4 is greater than the set rated temperature T3 of the seal cavity based on the temperature of the seal cavity 4.

[0103] If the temperature of the seal cavity is greater than the set rated temperature T3 of the seal cavity, the regulating valve opening control module adjusts the opening of the regulating valve for the seal flush according to the regulating valve opening control formula in the above steps, and the cooling water flow control module adjusts the cooling water flow for the motor cooling according to the cooling water flow control formula 2, that is, Q1=bP 输入 ((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )) adjusts the cooling water flow for the motor cooling, wherein T 机 is the temperature of the seal cavity, and T2 is the set rated temperature of the motor cavity.

[0104] If the temperature of the seal cavity is less than the set rated temperature T3 of the seal cavity, the cooling water flow control module adjusts the cooling water flow for the motor cooling according to the cooling water flow control formula in the above steps, and the regulating valve opening control module adjusts the opening of the regulating valve for the seal flush according to the regulating valve opening control formula in the above steps.

[0105] Embodiment two

[0106] A method for applying the high-speed pump cooling joint control system according to the above technical solution, referring to FIG. 1, comprises the following steps: Figure 4

[0107] Step S100, real-time acquisition of the temperature of the motor cavity and the temperature of the seal cavity;

[0108] Step S200, output of a joint control signal to the cooling water flow control module and the regulating valve opening control module based on the temperature of the motor cavity, adjustment of the cooling water flow for the motor water cooling and the opening of the regulating valve for the seal flush;

[0109] Step S300, output of a joint control signal to the cooling water flow control module and the regulating valve opening control module based on the temperature of the seal cavity, adjustment of the cooling water flow for the motor water cooling and the opening of the regulating valve for the seal flush.

[0110] In step S200, the following steps are included:

[0111] Based on the temperature of the motor cavity, it is judged whether the temperature of the motor cavity is greater than the set rated temperature T2;

[0112] ​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 for motor cooling based on the cooling water flow control formula 1, and the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on the regulating valve opening degree control formula 2, wherein T2 is the motor cavity set rated temperature, T 电 is the motor cavity temperature;

[0113] If the motor cavity temperature is less than the motor cavity set rated temperature T2, the cooling water flow control module adjusts the cooling water flow for motor cooling based on the cooling water flow control formula 1, and the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on the regulating valve opening degree control formula 1.

[0114] In step S300, the following steps are included:

[0115] Based on the seal cavity temperature, it is judged whether the seal cavity temperature is greater than the seal cavity set rated temperature T3;

[0116] If the seal cavity temperature is greater than the seal cavity set rated temperature T3, the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on step S200, that is, the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing using the regulating valve opening degree control formula 1 in the above step S200, and the cooling water flow control module adjusts the cooling water flow for motor cooling using the cooling water flow control formula 2, wherein T 机 is the seal cavity temperature, and T2 is the motor cavity set rated temperature;

[0117] If the seal cavity temperature is less than the seal cavity set rated temperature T3, the cooling water flow control module adjusts the cooling water flow for motor cooling based on step S200, that is, the cooling water flow control module adjusts the cooling water flow for motor cooling using the cooling water flow control formula 1 in the above step S200;

[0118] The regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing based on step S200, that is, the regulating valve opening degree control module adjusts the regulating valve opening degree for seal flushing using the regulating valve opening degree control formula 1 in the above step S200.

[0119] The cooling water flow control formula 1 is as follows:

[0120] Q1=bP 输入 (1-η) / (KL 厚 (T 电 -T 水 )),T 机 ≤T3;

[0121] The cooling water flow control formula 2 is as follows:

[0122] Q1=bP 输入 ((2T机 -T2) / T2(1-η) / (KL 厚 (T 电 -T 水 )),T 机 >T3;

[0123] In the formula, Q1 is the cooling water flow, 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 coefficient of the motor shell material, L 厚 is the equivalent thickness of the motor shell, T 电 is the temperature of the motor cavity, T 水 is the temperature of the cooling water inlet, T 机 is the temperature of the mechanical seal cavity, and T3 is the set rated temperature.

[0124] The control formula of the regulating valve opening is as follows:

[0125]

[0126] The control formula of the regulating valve opening is as follows:

[0127]

[0128] In the formula, f is the friction coefficient of the dynamic and static ring contact surface, p e is the specific load of the dynamic and static ring contact surface, v is the average linear velocity of the dynamic and static ring contact surface, A is the area of the dynamic and static ring contact surface, a is a correction coefficient, C e is the flow coefficient of the regulating valve orifice, 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 cavity and the water inlet of the pump body, P is the pressure difference before and after the regulating valve, T 电 is the temperature of the motor cavity, and T2 is the set rated temperature.

[0129] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A high speed pump cooling co-control system, characterized by, The temperature acquisition module, the cooling water flow control module, the joint control module and the regulating valve opening degree control module are included. The temperature acquisition module is used for acquiring the motor cavity temperature and the mechanical seal cavity temperature. The joint control module is used for acquiring the motor cavity temperature and the mechanical seal cavity temperature, and outputting a joint control signal to the cooling water flow control module and the regulating valve opening degree 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 degree control module adjusts the regulating valve opening degree of the mechanical seal flushing based on the joint control signal. The cooling water flow control module adjusts the cooling water flow of the motor cooling based on the obtained joint control signal according to a cooling water flow control formula ① as follows: Q1 = bP 输入 (1 - η) / (KL 厚 (T 电 -T 水 )), T 机 ≤ T3; The cooling water flow control formula ② is as follows: Q1 = bP 输入 ((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )),T 机 >T3; wherein Q1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the input power of the motor, 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 temperature of the motor cavity, T 水 is the temperature of the cooling water inlet, T 机 is the temperature of the mechanical seal cavity, and T3 is the set rated temperature of the mechanical seal cavity. The regulating valve opening degree control module adjusts the regulating valve opening degree of the mechanical seal flushing based on the obtained joint control signal according to a regulating valve opening degree control formula as follows: The regulating valve opening degree control formula ① is as follows: The regulating valve opening degree control formula ② is as follows In the formula, D is the opening of the regulating valve, f is the friction coefficient of the dynamic and static ring contact surface, p e is the specific load of the dynamic and static ring contact surface, v is the average linear velocity of the dynamic and static ring contact surface, A is the area of the dynamic and static ring contact surface, a is a correction coefficient, C e is the flow coefficient of the flow limiting hole of the regulating valve, p is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal cavity and the water inlet of the pump body, P is the pressure difference before and after the regulating valve, T 电 is the temperature of the motor cavity, and T2 is the set rated temperature of the motor cavity.

2. A high speed pump cooling co ntrol system as claimed in claim 1, wherein, The mechanical seal unit time friction heat formula is as follows: Q 机 = fp e vA; In the formula, f is the friction coefficient of the dynamic and static ring contact surface, p e is the specific load of the dynamic and static ring contact surface, v is the average linear velocity of the dynamic and static ring contact surface, and A is the area of the dynamic and static ring contact surface. The required mechanical seal flushing flow is calculated according to the mechanical seal unit time friction heat formula, and the required mechanical seal flushing flow formula is as follows: In the formula, Q2 is the medium volume flow 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 pump body water inlet. The required mechanical seal flushing flow formula is obtained by dimensionless method reasoning.

3. A method of applying the high-speed pump cooling co-control system according to any one of claims 1 to 2, characterized by, The method comprises the following steps: Step S100, real-time acquisition of the motor cavity temperature and the mechanical seal cavity temperature; Step S200, output of a joint control signal to the cooling water flow control module and the regulating valve opening degree control module based on the motor cavity temperature, adjustment of the cooling water flow of the motor water cooling and the regulating valve opening degree of the mechanical seal flushing; Step S300, output of a joint control signal to the cooling water flow control module and the regulating valve opening degree control module based on the mechanical seal cavity temperature, adjustment of the cooling water flow of the motor water cooling and the regulating valve opening degree of the mechanical seal flushing.

4. The method of cooling and governing a high speed pump system of claim 3, wherein, In step S200, the following steps are included: Based on the motor cavity temperature, it is judged 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 of the motor cooling based on the cooling water flow control formula ①, and the adjusting valve opening control module adjusts the adjusting valve opening of the motor seal flushing based on the adjusting valve opening control formula ②, wherein T2 is the motor cavity set rated temperature, T is the motor cavity temperature, Q is the cooling water flow of the motor cooling, Q is the adjusting valve opening of the motor seal flushing, and T is the motor cavity temperature. 电 is the motor cavity temperature; If the motor cavity temperature is less than the motor cavity set rated temperature T2, the cooling water flow control module adjusts the cooling water flow of the motor cooling based on the cooling water flow control formula ①, and the regulating valve opening degree control module adjusts the regulating valve opening degree of the mechanical seal flushing based on the regulating valve opening degree control formula ①.

5. The method of cooling and governing a high speed pump system of claim 4, wherein, In step S300, the following steps are included: Based on the mechanical seal cavity temperature, it is judged whether the mechanical seal cavity temperature is greater than the mechanical seal cavity set rated temperature T3; If the temperature of the machine seal cavity is greater than the set rated temperature T3 of the machine seal cavity, 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 adjusts the cooling water flow of the motor cooling according to the cooling water flow control formula ②, wherein T 机 is the temperature of the machine seal cavity, and T2 is the set rated temperature of the motor cavity. If the mechanical seal cavity temperature is less than the mechanical seal cavity set rated temperature T3, the cooling water flow control module adjusts the cooling water flow of the motor cooling based on step S200, and the regulating valve opening degree control module adjusts the regulating valve opening degree of the mechanical seal flushing based on step S200.

6. The method of claim 3, wherein The cooling water flow control formula ① is as follows: Q1 = bP 输入 (1 - η) / (KL 厚 (T 电 -T 水 )), T 机 ≤ T3; The cooling water flow control formula ② is as follows: Q1 = bP 输入 ((2T 机 -T2) / T2)(1-η) / (KL 厚 (T 电 -T 水 )), T 机 > T3; wherein Q1 is the cooling water flow rate, b is the equivalent width of the water cooling channel, P 输入 is the input power of the motor, 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 temperature of the motor cavity, T 水 is the temperature of the cooling water inlet, T 机 is the temperature of the mechanical seal cavity, T3 is the set rated temperature; The regulating valve opening degree control formula ① is as follows: The regulating valve opening degree control formula ② is as follows: In the formula, f is the friction coefficient of the dynamic and static ring contact surface, p e is the specific load of the dynamic and static ring contact surface, v is the average linear velocity of the dynamic and static ring contact surface, A is the area of the dynamic and static ring contact surface, a is a correction coefficient, C e is the flow coefficient of the flow limiting hole of the regulating valve, p is the density of the conveying medium, C is the specific heat of the medium, T is the temperature difference between the mechanical seal cavity and the water inlet of the pump body, P is the pressure difference before and after the regulating valve, T 电 is the temperature of the motor cavity, and T2 is the set rated temperature.

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