A high-precision intelligent control system for steam heat pump opening

Abstract

The present invention relates to a high-precision intelligent control system for the opening of a steam heat pump in the field of steam heat pumps. The system utilizes a screw rod, a slider and a power unit to accurately convert the rotational motion of a servo motor into the linear motion of a control rod. The system has a simple structure, high transmission efficiency and reliable precision. At the same time, the position of the control rod is fed back in real time by an encoder. A control algorithm combining fuzzy PID and a neural network is used to realize intelligent closed-loop control of the steam pressure at the outlet of a steam mixing pipe. The system can respond to complex and changeable pressure changes in working conditions more quickly and accurately, further improve the degree of mixing control of high-temperature and high-pressure high-quality steam and recovered low-temperature, low-pressure and low-quality steam, meet the demand for high-precision steam pressure control in industrial production, improve energy utilization efficiency, reduce energy waste, and reduce production costs, while ensuring the stability of the industrial production process and product quality, and has significant economic and social benefits.

Description

Technical Field

[0001] The invention relates to a steam heat pump opening system, in particular to a high-precision intelligent steam heat pump opening control system in the field of steam heat pumps. Background Art

[0002] Steam heat pumps are widely used in industrial production. For example, in the printing and dyeing industry, where dyeing and drying processes require large quantities of high-temperature steam, steam heat pumps can recycle the low-temperature waste heat steam generated during the dyeing process and elevate it to high-temperature steam sufficient for production. This allows for efficient utilization of waste heat and reduces the company's steam procurement costs. In the papermaking industry, the drying process of papermaking machines places strict demands on steam pressure and temperature. Steam heat pumps recycle waste steam from the drying process, compressing and heating it before re-using it, improving energy efficiency and reducing reliance on external energy sources.

[0003] Chinese patent CN202211439836.2 discloses a method and system for dispatching and distributing the output load of a steam heat pump system. The method uses the set temperature of steam to calculate the output opening control word target value of the steam heat pump system. The control word target value is corrected according to the PID calculation output value of the steam, the differential value of the current temperature of the steam, the differential value of the current temperature and current flow of the steam in the pipeline network, and the differential value of the current temperature and current flow of the steam generated by the steam heat pump system to obtain a control word correction value. By regulating the control word of the steam heat pump system, the output median steam load is stabilized to meet usage requirements.

[0004] Chinese patent CN202410132107.5 discloses a centrifugal steam heat pump gas-liquid separator control system. By presetting liquid level parameters, pressure relief and water discharge parameters and alarm parameters, the liquid level information of the liquid level gauge, the operating status and operating time of the pressure relief device and the water discharge device are monitored in real time. The controller predicts the liquid level change trend according to the opening of the steam discharge valve of the gas-liquid separator. The controller generates water replenishment instructions and opening and closing instructions of the pressure relief device and the water discharge device according to the predicted liquid level change trend, the current liquid level height, water replenishment parameters, the current operating status and operating time of the pressure relief device and the water discharge device. The present invention is mainly used to control the liquid level of the gas-liquid separator to be stable and reduce pressure fluctuations.

[0005] The control decisions of existing steam heat pumps are based on the sensor detection data feedback within the steam heat pump, and the steam heat pump opening is controlled in real time according to a preset calculation formula. This control method has the problem of insufficient accuracy and is difficult to meet the needs of some industrial production processes with extremely high steam pressure requirements. In the printing and dyeing industry, if the steam pressure fluctuates too much, it will cause uneven dyeing of fabrics and affect product quality. At the same time, in the papermaking process, unstable steam pressure may cause uneven drying of paper, resulting in defects such as brittle cracks or wrinkles. Traditional control methods cannot accurately adjust the steam pressure at the heat pump outlet, resulting in unstable product quality and serious energy waste during the production process. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the traditional control method cannot accurately adjust the steam pressure at the heat pump outlet, resulting in unstable product quality and serious energy waste during the production process.

[0007] To solve the above problems, the present invention provides a system for high-precision intelligent control of the opening of a steam heat pump, comprising a servo motor and a steam heat pump system, wherein an encoder is fixedly connected to the servo motor, a screw is provided on one side of the power output end of the servo motor, a coupling is connected between the power output end of the servo motor and the screw, a pair of bearing seats are provided on the side of the screw away from the servo motor, the screw passes through the two bearing seats in sequence and is rotatably connected to the bearing seats, a power unit is threadedly connected to the screw, a slider is fixedly connected to the end of the power unit away from the coupling, a pair of linear guide rails are fixedly connected between the two bearing seats, and both linear guide rails pass through the slider;

[0008] The steam heat pump system includes a steam mixing tube and a control rod fixedly connected to a slider. The end of the control rod away from the slider passes through and extends into the steam mixing tube and is fixedly connected to a conical adjusting component. Steam pipe 1 and steam pipe 2 are fixedly connected to the side wall of the steam mixing tube. The inlet of steam pipe 1 and the outlet of the steam mixing tube are fixedly connected to a flow sensor and a sensor array. The sensor array includes two types, model A and model B. The sensor array of model A includes a motor A. The power output end of motor A is fixedly connected to a fixing frame A. The end of motor A away from the fixing frame A is fixedly connected to a bracket A. A detection unit A is fixedly connected to the fixing frame A. The detection unit A includes a fixed cover A. A plurality of detection holes A are drilled on the fixed cover A. An annular mounting block fixedly connected to the fixing frame A is placed between the fixing cover A and the rear cover A. A plurality of mounting holes A are drilled on the annular mounting block, whose positions match the detection holes A, and the number of mounting holes A is twice that of the detection holes A. Sensor groups A are respectively installed in two adjacent mounting holes A. The sensor group A includes a temperature sensor and a pressure sensor.

[0009] In the above-mentioned high-precision intelligent control system for the opening of the steam heat pump, the present invention utilizes a screw, a slider, and a power unit to accurately convert the rotational motion of the servo motor into the linear motion of the control rod, and combines a control algorithm combining fuzzy PID and a neural network to realize intelligent closed-loop control of the steam pressure at the outlet of the steam mixing tube. It has a simple structure, high transmission efficiency, and reliable precision.

[0010] As a further improvement of the present application, the detection hole A is arranged on the leeward side, and the movement direction is from the motor A to the detection unit A, so that the detection data of the temperature sensor and the pressure sensor are relatively stable, and are not easily caused by direct steam blowing to cause fluctuations in the detection data, thereby reducing the frequency of the controller's response to the detection data.

[0011] As a further improvement of the present application, the detection hole A is threadedly connected to one end of the motor A that is close to the detection hole A, and a mounting groove A is carved on the back cover A for fixing the mounting hole A, while facilitating the disassembly of the annular mounting block and the temperature sensor and pressure sensor loaded thereon for maintenance and replacement.

[0012] As a further improvement of the present application, the fixed cover A, the annular mounting block and the back cover A are all made of insulating materials, and the annular mounting block is tightly fitted with the fixed cover A and the back cover A respectively. The contact surfaces of the annular mounting block and the fixed cover A and the back cover A are all smooth surfaces, which reduces the impact of high-temperature water vapor on the temperature sensor and pressure sensor of the spare part, and extends the service life of the temperature sensor and pressure sensor of the spare part.

[0013] As a further improvement of the present application, the sensor array of model B includes a motor B, the power output end of the motor B is fixedly connected to a fixing frame B, the end of the motor B away from the fixing frame B is fixedly connected to a bracket B, the two brackets B are respectively fixedly connected to the inner wall of the steam mixing pipe and the steam pipe one, the fixing frame B is fixedly connected to a detection unit B, the detection unit B includes a fixed cover B, a plurality of detection holes B are drilled on the fixing cover B, the fixing frame B is fixedly connected to a plurality of fan-shaped mounting blocks, the fixing frame B includes a connecting portion sleeved on the power output end of the motor B and a plurality of telescopic fixing portions fixedly connected to the connecting portion Rod, a tension spring is provided on the outer side of the movable part of the multiple telescopic rods, and the two ends of the multiple tension springs are fixedly connected to the fan-shaped mounting blocks and the fixed parts of the telescopic rods respectively. The multiple fan-shaped mounting blocks are provided with multiple mounting holes B whose positions match the detection holes B, and the number of mounting holes B is twice the number of detection holes B. Sensor groups B are respectively installed in two adjacent mounting holes B. Sensor group B includes the same temperature sensor and pressure sensor as sensor group A, reducing the non-working loss of the spare part temperature sensor and pressure sensor, and ensuring that it is in normal working condition to the maximum extent when the spare part is enabled.

[0014] As a further improvement of the present application, when the motor B is in a stationary state, the tension spring is in a stretched state, so that when the motor B stops rotating subsequently, the tension spring can more easily pull the fan-shaped mounting block back to its initial position, so that the mounting hole B is aligned with the detection hole B, and the sensor group B can be used normally.

[0015] As a further improvement of the present application, the end of the fixed cover B close to the motor B is threadedly connected to the back cover B, the inner wall of the back cover B is provided with a mounting groove B, and the end of the back cover B close to the fixed cover B is fixedly connected to a limiting edge, and the limiting edge is staggered with the position of the fixing frame B, which can limit the position of the fan-shaped mounting block, so that the fan-shaped mounting block is not easily displaced excessively and is not easily affected by the measurement.

[0016] As a further improvement of the present application, the motor B, bracket B, fixed cover B and sensor group B are respectively selected from the same model and function products as the motor A, bracket A, fixed cover A and sensor group A, so that most parts of the sensor array model A and model B can be directly replaced. On the one hand, the overall production cost of the two models of sensor arrays is reduced, and on the other hand, the maintenance and repair cost of the sensor array is also reduced.

[0017] In summary, the present invention utilizes a screw rod, a slider and a power unit to accurately convert the rotational motion of the servo motor into the linear motion of the control rod. It has a simple structure, high transmission efficiency and reliable precision. At the same time, the encoder is used to feed back the position of the control rod in real time. The control algorithm combining fuzzy PID and neural network is combined to realize intelligent closed-loop control of the steam pressure at the outlet of the steam mixing tube. It can respond to complex and changeable working pressure changes more quickly and accurately, further improve the steam pressure regulation accuracy, meet the stringent requirements of industrial production for high-precision steam pressure control, improve energy utilization efficiency, reduce energy waste, reduce production costs, and at the same time ensure the stability of the industrial production process and product quality, with significant economic and social benefits.

[0018] The sensor array is designed in two models, A and B, which are respectively suitable for low-cost product processing and high-cost product processing scenarios. At the same time, the sensor array of model A and the sensor array of model B try to use the same model and functional products for the same functional components, so that most parts can be directly replaced with each other. On the one hand, the overall production cost of the two models of sensor arrays is reduced, and on the other hand, the maintenance and repair costs of the sensor array are reduced, thereby increasing the versatility of the sensor array in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a steam heat pump with an opening control system according to the first embodiment of the present application;

[0020] Figure 2This is a side sectional view of a steam heat pump with an opening control system according to a first embodiment of the present application;

[0021] Figure 3 This is a schematic structural diagram of a sensor array A according to a first embodiment of the present application;

[0022] Figure 4 This is an exploded view of the main structure of the sensor array A according to the first embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of a sensor array B according to a second embodiment of the present application;

[0024] Figure 6 This is an exploded view of the main structure of the sensor array B according to the second embodiment of the present application;

[0025] Figure 7 This is a schematic structural diagram of a fan-shaped mounting block according to a second embodiment of the present application;

[0026] Figure 8 This is a structural diagram of a fixed cover B according to a second embodiment of the present application;

[0027] Figure 9 This is a structural diagram of the second embodiment of the present application after the fan-shaped mounting block and the fixed cover B are assembled;

[0028] Figure 10 This is a schematic diagram of the fan-shaped mounting block of the second embodiment of the present application changing with the working state.

[0029] Description of the numbers in the figure:

[0030] 1 Servo motor, 2 encoder, 3 screw rod, 4 coupling, 5 bearing seat, 6 slider, 7 power unit, 8 control rod, 9 conical adjustment component, 10 steam mixing pipe, 11 steam pipe 1, 12 steam pipe 2, 13 flow sensor, 14 sensor array, 15 motor A, 16 bracket A, 17 fixing frame A, 18 detection unit A, 1801 fixing cover A, 1802 detection hole A, 1803 annular mounting block, 1804 mounting hole A, 1805 back cover A, 1806 mounting slot A, 19 motor B, 20 bracket B, 21 fixing frame B, 22 detection unit B, 2201 fixing cover B, 2202 detection hole B, 2203 fan-shaped mounting block, 2204 mounting hole B, 2205 back cover B, 2206 mounting slot B, 2207 limit edge, 23 tension spring, 24 linear guide. DETAILED DESCRIPTION

[0031] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1 - Figure 4 A system for high-precision intelligent control of the opening of a steam heat pump is shown, comprising a servo motor 1 and a steam heat pump system. An encoder 2 is fixedly connected to the servo motor 1. A screw 3 is provided on one side of the power output end of the servo motor 1. A coupling 4 is connected between the power output end of the servo motor 1 and the screw 3. A pair of bearing seats 5 are provided on the side of the screw 3 away from the servo motor 1. The screw 3 passes through the two bearing seats 5 in sequence and is rotatably connected to the bearing seats 5. A power unit 7 is threadedly connected to the screw 3. A slider 6 is fixedly connected to the end of the power unit 7 away from the coupling 4. A pair of linear guide rails 24 are fixedly connected between the two bearing seats 5. Both linear guide rails 24 pass through the slider 6.

[0034] The steam heat pump system includes a steam mixing tube 10 and a control rod 8 fixedly connected to the slider 6. The end of the control rod 8 away from the slider 6 passes through and extends into the steam mixing tube 10 and is fixedly connected to a conical adjusting component 9. The side wall of the steam mixing tube 10 is fixedly connected to a steam pipe 11 and a steam pipe 2 12, wherein the steam pipe 11 is fed with high-temperature, high-pressure, high-quality steam, and the steam pipe 2 12 is fed with low-temperature, low-pressure, low-quality steam recovered during the working process. The inlet of the steam pipe 11 and the outlet of the steam mixing tube 10 are fixedly connected with a flow sensor 13 and a sensor array 14. The sensor array 14 includes two types, model A and model B. The sensor array 14 of model A includes a motor A15. The power output end of the motor A15 is fixedly connected to a fixing bracket A17, and the end of the motor A15 away from the fixing bracket A17 is fixedly connected to a support. The bracket A16 is fixedly connected to the inner wall of the steam mixing tube 10 and the steam pipe 11 respectively. The detection unit A18 is fixedly connected to the fixing bracket A17. The detection unit A18 includes a fixing cover A1801. The fixing cover A1801 is fixedly connected to the steam mixing tube 10 or the steam pipe 11. A plurality of detection holes A1802 are drilled on the fixing cover A1801. An annular mounting block 1803 fixedly connected to the fixing bracket A17 is placed between the fixing cover A1801 and the rear cover A1805. A plurality of mounting holes A1804 are drilled on the annular mounting block 1803, the positions of which match the detection holes A1802, and the number of the mounting holes A1804 is twice the number of the detection holes A1802. Sensor groups A are respectively installed in two adjacent mounting holes A1804. The sensor group A includes a temperature sensor and a pressure sensor.

[0035] In particular, in the present invention, a reverser having a function and structure similar to that of a ball screw is also provided in the power unit 7, so that the power unit 7 can convert rotational motion into linear motion like a ball screw. This is a well-known technology among those skilled in the art, and therefore is not disclosed in detail in this application.

[0036] The location where the steam mixing tube 10 is connected to the steam pipe 1 11 and the steam pipe 2 12 is a mixing chamber. The high-temperature and high-pressure steam first passes through the part with the contracted inner diameter of the steam mixing tube 10 to form a low-pressure area in the mixing chamber of the steam mixing tube 10. The low-temperature and low-pressure steam is sucked in from the steam pipe 2 12, mixed in the mixing chamber and energy exchanged. Then, the mixed steam passes through the part with the expanded inner diameter of the steam mixing tube 10 to reduce its velocity and increase its pressure, thereby obtaining mixed steam with higher pressure and temperature to meet different process requirements.

[0037] In the present invention, adjacent temperature sensors and pressure sensors are grouped together, the temperature sensors and pressure sensors whose positions coincide with the detection hole A1802 are the working parts, and the temperature sensors and pressure sensors blocked by the fixed cover A1801 are the spare parts. During the operation of the steam heat pump system, the working part temperature sensors and pressure sensors send back data in real time to provide data support for the operation of the servo motor 1. When one group of data in the three groups of working parts differs greatly from the other two groups of data (more than 5%), the positions of the sensors of the three groups of working parts are replaced by rotating the motor A15, and the detection is carried out again. The working part sensors at the same position are detected. When the data does not change significantly after replacement (no more than 1%), it is determined that stratification is present in the steam temperature or pressure, and the working part sensor is in normal working condition. When the detection data of the working part sensor at the same position changes significantly after replacement (more than 1%), it is determined that a single data working part sensor is damaged, and its detection data is invalidated, and it stops affecting the working condition of servo motor 1. After a huge gap appears in the detection data of the remaining two groups of working part sensors, the above-mentioned sensor detection steps are performed again. When there is still a large gap in the detection data of the remaining working part sensors, it is determined that the working part sensor has failed, and the sensor of the spare part is activated.

[0038] If the detection data of the three groups of working parts are quite different, the three groups of working part sensors are also tested. When the detection data do not change significantly, it is determined that the working part sensors are in normal working state, and the detection work is continued, and data support is provided for the operation of the servo motor 1. When the detection data changes significantly, it is determined that multiple working part sensors are simultaneously faulty, and the backup part is activated.

[0039] The sensor angular distance between the working part and the standby part is 60°. When the working status of the sensor needs to be detected, the power output end of motor A15 needs to rotate an integer multiple of 120°. When the working part is switched to the standby part, the power output end of motor A15 needs to rotate an odd multiple of 60°.

[0040] In particular, in the present invention, a controller is further provided, which is signal-connected to the servo motor 1, the motor A15, multiple temperature sensors, multiple pressure sensors and the motor B19, and is used to receive detection data or issue control instructions.

[0041] The method for using the high-precision intelligent control system for the steam heat pump opening mainly includes the following steps:

[0042] S1. System initialization: The controller reads the detection data of the temperature sensor and pressure sensor, and initializes the servo motor 1, encoder 2 and motor A15, while loading the fuzzy PID control rules and neural network preset parameters;

[0043] In view of the nonlinear characteristics of the steam heat pump system (such as the change of steam specific heat capacity with pressure, dynamic drift of pipeline thermal resistance) and large hysteresis links (steam transmission delay, heat exchange inertia of heat pump), the traditional PID control cannot adapt to the changes in working conditions due to its fixed parameters. This invention adopts a two-dimensional fuzzy controller (the input is the temperature deviation Δ e The fuzzy controller monitors the system status in real time and adjusts the PID parameters online through the rule base to solve the problem of traditional PID control performance degradation under variable working conditions.

[0044] Temperature deviation Δ e The measured settings are as follows: the domain is divided into: {−6, −4, −2, 0, +2, +4, +6} (unit: °C), the deviation change rate ec = Δe / Δt, the domain is divided into: {−3, −2, −1, 0, +1, +2, +3} (unit: °C / s), the linguistic variables use 7-level fuzzy subsets: {NB, NM, NS, ZO, PS, PM, PB} (negative large, negative medium, negative small, zero, positive small, positive medium, positive large), the PID parameter adjustment amount ΔKp / ΔKi / ΔKd, the domain is {−0.3, −0.2, −0.1, 0, +0.1, +0.2, +0.3}, and the triangular membership function is used.

[0045] And customize the following fuzzy rule base:

[0046] Rule 1:

[0047] if Δe is NB and ec is NB;

[0048] thenΔKp is PB,ΔKi is NB,ΔKd is PS;

[0049] Rule 2:

[0050] If Δe is ZO and ec is PS;

[0051] Then ΔKp is NM, ΔKi is ZO, ΔKd is PM.

[0052] A total of several rules have been formulated, and the above are for reference only. The rules generally follow the principle of "strengthening proportional control when the deviation is large, enhancing the integral effect when the deviation is small, and optimizing differential regulation in the dynamic process."

[0053] Then the centroid method is used to defuzzify and obtain the precise adjustment amount:

[0054] Kp ( t )= Kp 0+ μ (Δ Kp );

[0055] Ki ( t )= Ki 0+ μ (Δ Ki );

[0056] Kd ( t )= Kd 0+ μ (Δ Kd );

[0057] Among them, Kp0, Ki0, Kd0 are the initial PID parameters, μ(Δ Kp )、 μ (Δ Ki) and μ (Δ Kd) The actual adjustment value after defuzzification is inserted in real time, so that the PID parameters are dynamically optimized according to the working conditions. For example, when the steam pressure drops suddenly, Kp is automatically increased to quickly compensate for the flow attenuation.

[0058] In addition, to address the hysteresis characteristics of steam heat pump systems (e.g., a delay of approximately 10-30 seconds from servo motor operation to temperature change), a three-layer BP neural network was used to construct a prediction model. The input layer contains 6 nodes (temperature at the previous 3 moments, pressure at the previous 2 moments, and speed at the previous 1 moment), the hidden layer contains 12 nodes (Sigmoid activation function), and the output layer contains 1 node (the predicted temperature value at the next moment).

[0059] Input vector:

[0060] X(t)=[T(t−3),T(t−2),T(t−1),P(t−2),P(t−1),n(t−1)]

[0061] It includes the temperature sequence of the first 3 seconds, the steam pressure of the first 2 seconds, and the servo motor speed to capture the dynamic inertia of the system;

[0062] Output target:

[0063] The predicted temperature value for the next 30 seconds is ΔT(t+1)=f(X(t)), and the prediction step size matches the steam pipeline delay time;

[0064] The historical operating data (temperature, pressure, motor speed) were normalized (range [-1, 1]), and the sliding window method was used to generate training samples (window size = 1000, step size = 10);

[0065] Training algorithm: Gradient descent with momentum (learning rate = 0.01, momentum factor = 0.9), with mean squared error (MSE) as the loss function.

[0066] Prediction optimization: Through a rolling optimization strategy, the prediction model is updated every second, using the latest data to correct the prediction results and improve the adaptability of the time-varying system;

[0067] When the neural network predicts that the future temperature will deviate from the set value (e.g., the predicted deviation is >±0.5°C), the servo motor pre-adjustment is triggered in advance:

[0068] If the predicted temperature is lower than the set value and the steam pressure is decreasing, increase the motor speed 5 seconds in advance (increment = predicted deviation × pressure change rate × weight coefficient) and open the flow control valve in advance;

[0069] If the temperature is predicted to overshoot, the motor speed is reduced 3 seconds in advance, and the valve inertia is used to slow down the flow increase and suppress the overshoot;

[0070] S2. Real-time monitoring: The temperature sensor and pressure sensor monitor the steam temperature and pressure at the outlet of the steam mixing pipe 10 and the inlet of the steam pipe 11 in real time, and transmit the detection data to the controller. The encoder 2 monitors the rotation angle of the servo motor 1 in real time and feeds back the angle signal to the controller;

[0071] S3. Calculation and adjustment: The controller performs fuzzification, fuzzy reasoning, and defuzzification operations according to the process of the fuzzy PID control algorithm based on the deviation between the preset outlet pressure value and the actual detected outlet pressure value, as well as the deviation change rate, to calculate the PID parameters that need to be adjusted and the rotation angle and direction of the servo motor 1;

[0072] S4. Execute adjustment: Based on the calculation results, the controller sends a control signal to the servo motor to control the rotation of the servo motor 1, and drives the control rod 8 to move through the screw rod 3, the slider 6 and the power unit 7 to adjust the working state of the steam heat pump and achieve precise regulation of the steam pressure at the outlet of the steam mixing pipe 10. During operation, the controller will also adaptively adjust the parameters of the fuzzy control algorithm according to the actual operation of the system to optimize the control effect.

[0073] The present invention utilizes the screw rod 3, the slider 6 and the power unit 7 to accurately convert the rotary motion of the servo motor 1 into the linear motion of the control rod 8, and has a simple structure, high transmission efficiency and reliable precision.

[0074] By using encoder 2 to provide real-time feedback on the control lever position and combining a control algorithm that combines fuzzy PID with a neural network, intelligent closed-loop control of the steam pressure at the outlet of the steam mixing tube 10 is achieved. This can respond more quickly and accurately to complex and changeable pressure changes in operating conditions, further improving the steam pressure regulation accuracy and meeting the stringent requirements of industrial production for high-precision steam pressure control.

[0075] It improves energy utilization efficiency, reduces energy waste, and lowers production costs, while ensuring the stability of the industrial production process and product quality, with significant economic and social benefits.

[0076] The detection hole A1802 is set on the leeward side, and the movement direction is from the motor A15 to the detection unit A18, so that the detection data of the temperature sensor and the pressure sensor are relatively stable, and it is not easy to cause fluctuations in the detection data due to direct steam blowing, thereby reducing the frequency of the controller's response to the detection data.

[0077] The detection hole A1802 is threadedly connected to the end of the motor A15 that is close to the back cover A1805 that matches itself. The back cover A1805 is provided with a mounting groove A1806 for fixing the mounting hole A1804. It also facilitates the disassembly of the annular mounting block 1803 and the temperature sensor and pressure sensor loaded thereon for maintenance and replacement.

[0078] The fixed cover A1801, the annular mounting block 1803 and the back cover A1805 are all made of insulating materials, and the annular mounting block 1803 is tightly fitted with the fixed cover A1801 and the back cover A1805 respectively. The contact surfaces of the annular mounting block 1803 and the fixed cover A1801 and the back cover A1805 are all smooth surfaces, which reduces the impact of high-temperature water vapor on the temperature sensor and pressure sensor of the spare part, and extends the service life of the temperature sensor and pressure sensor of the spare part.

[0079] In the present invention, a detection unit A18 composed of multiple groups of temperature sensors and pressure sensors is used to detect the steam temperature and pressure at the outlet of the steam mixing tube 10 and the inlet of the steam pipe 11. By verifying each other through multiple groups of data, the reliability of the detection data is increased, and the regulation of the servo motor 1 is made more accurate. At the same time, it is possible to verify whether there are faults in the working detection temperature sensors and pressure sensors, and promptly eliminate the detection data of the faulty temperature sensor and pressure sensor group, thereby improving the accuracy of the opening regulation of the steam heat pump system. By setting up sensors in the spare part, temporary replacement detection work can be achieved after all the working part sensors fail, so that the steam heat pump can be stopped at an appropriate time in the future for maintenance work, thereby reducing the impact on the production efficiency of the steam heat pump.

[0080] The second implementation method:

[0081] Figure 6-9 The sensor array 14 of model B is shown to include a motor B19, a fixed bracket B21 is fixedly connected to the power output end of the motor B19, a bracket B20 is fixedly connected to the end of the motor B19 away from the fixed bracket B21, and the two brackets B20 are fixedly connected to the inner wall of the steam mixing pipe 10 and the steam pipe 11 respectively. A detection unit B22 is fixedly connected to the fixed bracket B21, and the detection unit B22 includes a fixed cover B2201, and a plurality of detection holes B2202 are drilled on the fixed cover B2201. The fixed bracket B21 is fixedly connected to a plurality of fan-shaped mounting blocks 2203, and the fixed bracket B21 includes a fixed cover B2201 and a plurality of detection holes B2202. 9 A connecting portion on the power output end and multiple telescopic rods fixedly connected to the connecting portion, a tension spring 23 is sleeved on the outer side of the movable portion of the multiple telescopic rods, the two ends of the multiple tension springs 23 are respectively fixedly connected to the fan-shaped mounting block 2203 and the fixed portion of the telescopic rod, the multiple fan-shaped mounting blocks 2203 are drilled with multiple mounting holes B2204 whose positions match the detection holes B2202, and the number of mounting holes B2204 is twice that of the detection holes B2202, and sensor groups B are respectively installed in two adjacent mounting holes B2204, and sensor group B includes the same temperature sensor and pressure sensor as sensor group A.

[0082] In this embodiment, the connection position between the telescopic rod and the tension spring 23 is as close as possible to the temperature sensor and pressure sensor of the spare part, so that when the tension spring 23 moves, the temperature sensor and pressure sensor of the spare part can be as far away from the detection hole B2202 as possible, thereby increasing the protection effect of the temperature sensor and pressure sensor of the spare part.

[0083] See also Figure 10When the multiple fan-shaped mounting blocks 2203 of the present application rotate under the drive of the power output end of the motor B19, under the action of centrifugal force, the fan-shaped mounting blocks 2203 will be thrown away from the power output end of the motor B19, so that during the rotation process, the positions of the multiple mounting holes B2204 are staggered with the positions of the detection holes B2202, making it difficult for the temperature sensor and pressure sensor of the spare part to directly contact the high-temperature and high-pressure steam, reducing the non-working loss of the temperature sensor and pressure sensor of the spare part, and making it easy for the spare part to be in normal working condition when it is enabled.

[0084] When the motor B19 is in a stationary state, the tension spring 23 is in a stretched state, so that when the motor B19 stops rotating subsequently, the tension spring 23 can more easily pull the fan-shaped mounting block 2203 back to its initial position, so that the mounting hole B2204 is aligned with the detection hole B2202, and the sensor group B can be used normally.

[0085] See also Figure 6 and Figure 8-9 The end of the fixed cover B2201 close to the motor B19 is threadedly connected to the back cover B2205, and the inner wall of the back cover B2205 is provided with a mounting groove B2206. The end of the back cover B2205 close to the fixed cover B2201 is fixedly connected to the limiting edge 2207, and the limiting edge 2207 is staggered with the position of the fixing frame B21, which can limit the position of the fan-shaped mounting block 2203, so that the fan-shaped mounting block 2203 is not easily displaced excessively and does not easily affect the measurement.

[0086] The motor B19, bracket B20, fixed cover B2201 and sensor group B are products of the same model and function as the motor A15, bracket A16, fixed cover A1801 and sensor group A, respectively, so that most parts of model A and model B of the sensor array 14 can be directly replaced. On the one hand, the overall production cost of the two models of sensor arrays 14 is reduced, and on the other hand, the maintenance and repair cost of the sensor array 14 is also reduced. The fan-shaped mounting block 2203 in the detection unit B22 and the annular mounting block 1803 in the detection unit A18 are sealed in the same way.

[0087] The operation of motor A15 and motor B19 can also be monitored and controlled by setting up corresponding encoders. In addition, due to the particularity of the working environment of motor A15 and motor B19, and only intermittent work is required, there is no need to consider the heat dissipation problem too much. Therefore, an insulating sealed shell is set on the outside of motor A15 and motor B19 to protect the safety of motor A15 and motor B19. The wiring of motor A15 and motor B19 can be buried in the inner wall of the steam mixing tube 10, etc. At the same time, the sensor group A and sensor group B involved in this application also need to use sensor types that can perform wireless information transmission, which reduces the influence of wiring on the rotation of the sensor array. The power supply of sensor group A and sensor group B can be selected by setting batteries in the annular mounting block 1803 and the fan-shaped mounting block 2203.

[0088] Compared with the first embodiment, the sensor array 14 of model B in this embodiment can realize that when multiple fan-shaped mounting blocks 2203 rotate under the drive of the power output end of the motor B19, the fan-shaped mounting blocks 2203 will be thrown out in the direction away from the power output end of the motor B19, so that during the rotation process, the positions of the multiple mounting holes B2204 are staggered with the positions of the detection holes B2202, so that the temperature sensor and pressure sensor of the spare part are not easily directly contacted with the high-temperature and high-pressure steam, thereby reducing the non-working loss of the temperature sensor and pressure sensor of the spare part. Although the selection of the fixing frame B21 and the use of the tension spring 23 and the fan-shaped mounting block 2203 do increase the use cost of the sensor array 14, during use, the contact between the temperature sensor and pressure sensor of the spare part and the high-temperature and high-pressure steam can be reduced, thereby increasing the working reliability of the sensor array 14 of model B, and being suitable for application environments where high-cost products are produced. By precisely controlling the steam opening, the defective rate of the product can be reduced.

[0089] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A high-precision intelligent control system for the opening of a steam heat pump, comprising a servo motor (1), a steam heat pump system and a controller, characterized in that: An encoder (2) is fixedly connected to the servo motor (1), a screw (3) is provided on one side of the power output end of the servo motor (1), a coupling (4) is connected between the power output end of the servo motor (1) and the screw (3), a pair of bearing seats (5) are provided on the side of the screw (3) away from the servo motor (1), the screw (3) sequentially passes through the two bearing seats (5) and is rotatably connected to the bearing seats (5), a power unit (7) is threadedly connected to the screw (3), and a slider (6) is fixedly connected to one end of the power unit (7) away from the coupling (4), a pair of linear guide rails (24) are fixedly connected between the two bearing seats (5), and both of the linear guide rails (24) pass through the slider (6); The steam heat pump system includes a steam mixing tube (10) and a control rod (8) fixedly connected to a slider (6), wherein the end of the control rod (8) away from the slider (6) penetrates and extends into the steam mixing tube (10) and is fixedly connected to a conical regulating component (9), a steam pipe 1 (11) and a steam pipe 2 (12) are fixedly connected to the side wall of the steam mixing tube (10), a flow sensor (13) and a sensor array (14) are fixedly connected at the inlet of the steam pipe 1 (11) and the outlet of the steam mixing tube (10), the sensor array (14) includes two types, model A and model B, the sensor array (14) of model A includes a motor A (15), a power output end of the motor A (15) is fixedly connected to a fixing bracket A (17), and the motor A (15) is away from the fixing bracket A ( One end of the fixing frame A (17) is fixedly connected to a bracket A (16), and a detection unit A (18) is fixedly connected to the fixing frame A (17), and the detection unit A (18) includes a fixing cover A (1801), and a plurality of detection holes A (1802) are drilled on the fixing cover A (1801), and an annular mounting block (1803) fixedly connected to the fixing frame A (17) is placed between the fixing cover A (1801) and the back cover A (1805), and a plurality of mounting holes A (1804) whose positions match the detection holes A (1802) are drilled on the annular mounting block (1803), and the number of the mounting holes A (1804) is twice the number of the detection holes A (1802), and a sensor group A is respectively installed in two adjacent mounting holes A (1804), and the sensor group A includes a temperature sensor and a pressure sensor; The controller sends a control signal to the servo motor based on the detection data of the sensor array (14), controls the rotation of the servo motor (1), drives the control rod (8) to move through the screw rod (3), the slider (6) and the power unit (7), adjusts the working state of the steam heat pump, and realizes the precise regulation of the steam pressure at the outlet of the steam mixing pipe (10). During the operation, the controller also adaptively adjusts the parameters of the fuzzy control algorithm according to the actual operation of the system to optimize the control effect.

2. The high-precision intelligent control system for the opening of a steam heat pump according to claim 1, characterized in that: The detection hole A (1802) is arranged on the leeward side, and moves in a direction from the motor A (15) to the detection unit A (18).

3. The high-precision intelligent control system for the opening of a steam heat pump according to claim 1, characterized in that: One end of the detection hole A (1802) close to the motor A (15) is threadedly connected to a back cover A (1805) that matches the detection hole A (1802), and a mounting groove A (1806) is cut on the back cover A (1805).

4. The high-precision intelligent control system for the steam heat pump opening according to claim 3 is characterized by: The fixed cover A (1801), the annular mounting block (1803) and the rear cover A (1805) are all made of insulating materials, and the annular mounting block (1803) is tightly fitted with the fixed cover A (1801) and the rear cover A (1805) respectively, and the contact surfaces of the annular mounting block (1803) with the fixed cover A (1801) and the rear cover A (1805) are all smooth surfaces.

5. The high-precision intelligent control system for the opening of a steam heat pump according to claim 1, characterized in that: The sensor array (14) of model B includes a motor B (19), a power output end of the motor B (19) is fixedly connected to a fixing frame B (21), an end of the motor B (19) away from the fixing frame B (21) is fixedly connected to a bracket B (20), two brackets B (20) are fixedly connected to the inner wall of the steam mixing pipe (10) and the steam pipe (11), respectively, a detection unit B (22) is fixedly connected to the fixing frame B (21), and the detection unit B (22) includes a fixing cover B (2201), a plurality of detection holes B (2202) are drilled on the fixing cover B (2201), a plurality of fan-shaped mounting blocks (2203) are fixedly connected to the fixing frame B (21), and the fixing frame B (2201) is fixedly connected to the inner wall of the steam mixing pipe (10) and the steam pipe (11). (21) includes a connecting portion sleeved on the power output end of the motor B (19) and a plurality of telescopic rods fixedly connected to the connecting portion, a plurality of stretching springs (23) are sleeved on the outer side of the movable portion of the telescopic rods, and the two ends of the plurality of stretching springs (23) are respectively fixedly connected to the fan-shaped mounting block (2203) and the fixed portion of the telescopic rod, and the plurality of fan-shaped mounting blocks (2203) are bored with a plurality of mounting holes B (2204) whose positions match the detection holes B (2202), and the number of the mounting holes B (2204) is twice the number of the detection holes B (2202), and a sensor group B is respectively installed in two adjacent mounting holes B (2204), and the sensor group B includes the same temperature sensor and pressure sensor as the sensor group A.

6. The high-precision intelligent control system for the steam heat pump opening according to claim 5, characterized in that: When the motor B (19) is in a stationary state, the tension spring (23) is in a tensioned state.

7. The high-precision intelligent control system for the opening of a steam heat pump according to claim 5, characterized in that: One end of the fixed cover B (2201) close to the motor B (19) is threadedly connected to the rear cover B (2205), an inner wall of the rear cover B (2205) is bored with a mounting groove B (2206), and one end of the rear cover B (2205) close to the fixed cover B (2201) is fixedly connected to a limiting edge (2207), and the limiting edge (2207) is staggered with respect to the fixing frame B (21).

8. The high-precision intelligent control system for the opening of a steam heat pump according to claim 5, characterized in that: The motor B (19), bracket B (20), fixed cover B (2201) and sensor group B are respectively selected from products of the same model and function as the motor A (15), bracket A (16), fixed cover A (1801) and sensor group A.

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