Electric regulating valve for water pipe system

Abstract

The utility model discloses a kind of water pipe system electric regulating valve, belong to regulating valve technical field, solve the current detection resistance of electric regulating valve in constant pressure water supply system due to long-term heating and environmental high temperature temperature drift occurs, make control circuit sampling current lower than actual value, misjudge motor load light problem. Including electric actuator, with the controller of electric actuator electric connection, and the current sampling temperature drift compensation circuit electrically connected between motor and controller in electric actuator, the current sampling temperature drift compensation circuit includes current detection module, signal amplification module, reference voltage module, temperature sensing module, compensation operation module. The utility model by real-time acquisition current detection resistance's working temperature and convert into compensation voltage, synchronous reverse superposition to original current sampling signal, to offset current sampling distortion caused by temperature drift, finally output temperature compensation after accurate current value to analog-digital converter after transmission to controller.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and in particular to an electric regulating valve for a water pipe system. Background Technology

[0002] Electric regulating valves for water pipe systems are key control devices installed in water pipe systems. They consist of an electric actuator and a valve body, and can receive control signals to drive the valve core to adjust the opening. They can control the flow rate, pressure, and temperature of water or other fluids in the pipes, and are suitable for scenarios such as air conditioning, heating, and industrial water circulation, enabling the system to supply energy on demand, ensuring stable operation, and contributing to energy conservation.

[0003] In the constant pressure water supply system of high-rise buildings, a key electric regulating valve is responsible for adjusting the water pump outlet flow in real time according to the pipeline pressure to maintain the set pressure. When the system is running continuously during the peak water consumption period and the ambient temperature is high, the current detection resistor inside the valve actuator will experience a significant temperature coefficient drift due to the heat generated by long-term operation and the superposition of ambient temperature. This causes the motor operating current value sampled by the control circuit to be continuously lower than the actual value, resulting in a misjudgment that the motor load is too light.

[0004] Therefore, an electric regulating valve for water pipe systems is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an electric regulating valve for water pipe systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An electrically controlled regulating valve for a water pipe system includes an electric actuator, a controller electrically connected to the electric actuator, and a current sampling temperature drift compensation circuit electrically connected between a motor in the electric actuator and the controller. The current sampling temperature drift compensation circuit includes a current detection module, a signal amplification module, a reference voltage module, a temperature sensing module, and a compensation calculation module. The current detection module receives the drive current of the motor in the electric actuator. The output terminal of the compensation calculation module is connected to the input terminal of the controller. The current signal output terminal of the current detection module is connected to the non-inverting input terminal of the signal amplification module. The voltage output terminal of the signal amplification module is connected to the inverting input terminal of the compensation calculation module. The temperature signal output terminal of the temperature sensing module is connected to the non-inverting input terminal of the compensation calculation module. The reference voltage output terminal of the reference voltage module is connected to the voltage input terminal of the temperature sensing module. The compensation signal output terminal of the compensation calculation module is connected to the input terminal of a compensation gain resistor.

[0008] Preferably, the signal amplification module includes an AD8421 instrumentation amplifier, a first filter capacitor, and a second filter capacitor. The inverting input terminal of the AD8421 instrumentation amplifier is connected to the positive drive terminal of the motor in the electric actuator. The reference terminal of the AD8421 instrumentation amplifier is grounded. The positive power supply terminal of the AD8421 instrumentation amplifier is connected to a +12V power supply. The positive power supply terminal of the AD8421 instrumentation amplifier is connected to one end of the first filter capacitor, and the other end of the first filter capacitor is grounded. The negative power supply terminal of the AD8421 instrumentation amplifier is connected to -12V. The negative power supply terminal of the AD8421 instrumentation amplifier is connected to one end of the second filter capacitor, and the other end of the second filter capacitor is grounded. The signal output terminal of the AD8421 instrumentation amplifier is connected to the inverting input terminal of the compensation operation module after being connected in series with a current-limiting resistor.

[0009] Preferably, the compensation operation module includes an ADA4528 operational amplifier, a gain setting resistor, and a compensation gain resistor. The inverting input of the ADA4528 operational amplifier is connected to the voltage output of the signal amplification module, the non-inverting input of the ADA4528 operational amplifier is connected to the temperature signal output of the temperature sensing module, the signal output of the ADA4528 operational amplifier is connected to the input of the compensation gain resistor, the output of the compensation gain resistor is used to connect to the controller through an analog-to-digital converter, and the gain setting resistor is connected between the signal output and the inverting input of the ADA4528 operational amplifier.

[0010] Preferably, the temperature sensing module includes an NTC thermistor, a first voltage divider resistor, and a second voltage divider resistor. The power input terminal of the NTC thermistor is connected to the reference voltage output terminal of the reference voltage module. The signal output terminal of the NTC thermistor is connected to one end of the first voltage divider resistor and one end of the second voltage divider resistor. The other end of the first voltage divider resistor is connected to the non-inverting input terminal of the compensation calculation module, and the other end of the second voltage divider resistor is grounded.

[0011] Preferably, the reference voltage module includes a REF5050 reference source, the power input terminal of the REF5050 reference source is connected to a +12V power supply, the reference voltage output terminal of the REF5050 reference source is connected to the voltage input terminal of the temperature sensing module, and the ground terminal of the REF5050 reference source is grounded.

[0012] Preferably, the current detection module includes a current detection resistor, the current inflow end of which is connected to the negative terminal of the drive circuit of the motor in the electric actuator, and the current outflow end of which is connected to the positive input terminal of the signal amplification module.

[0013] Preferably, it further includes a valve body, a valve core disposed within the valve body, a connecting frame fixedly connected to the valve body, and a valve stem connected to the valve core and extending through the valve body to the outside. The electric actuator is fixedly connected to the connecting frame, and the movable end of the electric actuator is drively connected to the valve stem.

[0014] This utility model has the following beneficial effects:

[0015] This invention collects the operating temperature of the current sensing resistor in real time and converts it into a compensation voltage, which is then synchronously superimposed on the original current sampling signal to cancel the current sampling distortion caused by temperature drift. Finally, the accurate current value after temperature compensation is output to the analog-to-digital converter and then transmitted to the controller. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a block diagram of the current sampling temperature drift compensation circuit in this utility model.

[0019] In the diagram: 1. Valve body; 2. Connecting frame; 3. Electric actuator; 4. Valve stem; 5. Current detection module; 6. Signal amplification module; 7. Reference voltage module; 8. Temperature sensing module; 9. Compensation calculation module. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] An electric regulating valve for a water pipe system, such as Figure 1 As shown, the device includes a valve body 1, a valve core disposed within the valve body 1, a connecting frame 2 fixedly connected to the valve body 1, a valve stem 4 connected to the valve core and extending through the valve body 1 to the outside, an electric actuator 3, a controller electrically connected to the electric actuator 3, and a current sampling temperature drift compensation circuit electrically connected between the motor and the controller in the electric actuator 3. The electric actuator 3 is fixedly connected to the connecting frame 2, and the movable end of the electric actuator 3 is connected to the valve stem 4 in a transmission connection.

[0027] like Figure 2As shown, the current sampling temperature drift compensation circuit includes a current detection module 5, a signal amplification module 6, a reference voltage module 7, a temperature sensing module 8, and a compensation calculation module 9. The current detection module 5 receives the drive current of the motor in the electric actuator 3. The output terminal of the compensation calculation module 9 is connected to the input terminal of the controller. The current signal output terminal of the current detection module 5 is connected to the non-inverting input terminal of the signal amplification module 6. The voltage output terminal of the signal amplification module 6 is connected to the inverting input terminal of the compensation calculation module 9. The temperature signal output terminal of the temperature sensing module 8 is connected to the non-inverting input terminal of the compensation calculation module 9. The reference voltage output terminal of the reference voltage module 7 is connected to the voltage input terminal of the temperature sensing module 8. The compensation signal output terminal of the compensation calculation module 9 is connected to the input terminal of the compensation gain resistor.

[0028] The signal amplification module 6 includes an AD8421 instrumentation amplifier, a first filter capacitor, and a second filter capacitor. The inverting input terminal of the AD8421 instrumentation amplifier is connected to the positive drive terminal of the motor in the electric actuator 3. The reference terminal of the AD8421 instrumentation amplifier is grounded. The positive power supply terminal of the AD8421 instrumentation amplifier is connected to a +12V power supply. The positive power supply terminal of the AD8421 instrumentation amplifier is connected to one end of the first filter capacitor, and the other end of the first filter capacitor is grounded. The negative power supply terminal of the AD8421 instrumentation amplifier is connected to -12V. The negative power supply terminal of the AD8421 instrumentation amplifier is connected to one end of the second filter capacitor, and the other end of the second filter capacitor is grounded. The signal output terminal of the AD8421 instrumentation amplifier is connected to the inverting input terminal of the compensation operation module 9 after being connected in series with a current-limiting resistor.

[0029] The compensation operation module 9 includes an ADA4528 operational amplifier, a gain setting resistor, and a compensation gain resistor. The inverting input of the ADA4528 operational amplifier is connected to the voltage output of the signal amplification module 6, the non-inverting input of the ADA4528 operational amplifier is connected to the temperature signal output of the temperature sensing module 8, the signal output of the ADA4528 operational amplifier is connected to the input of the compensation gain resistor, and the output of the compensation gain resistor is used to connect to the controller through an analog-to-digital converter. The gain setting resistor is connected between the signal output and the inverting input of the ADA4528 operational amplifier.

[0030] The temperature sensing module 8 includes an NTC thermistor, a first voltage divider resistor, and a second voltage divider resistor. The power input terminal of the NTC thermistor is connected to the reference voltage output terminal of the reference voltage module 7. The signal output terminal of the NTC thermistor is connected to one end of the first voltage divider resistor and one end of the second voltage divider resistor. The other end of the first voltage divider resistor is connected to the non-inverting input terminal of the compensation calculation module 9, and the other end of the second voltage divider resistor is grounded.

[0031] The reference voltage module 7 includes a REF5050 reference source. The power input terminal of the REF5050 reference source is connected to a +12V power supply. The reference voltage output terminal of the REF5050 reference source is connected to the voltage input terminal of the temperature sensing module 8. The ground terminal of the REF5050 reference source is grounded.

[0032] The current detection module 5 includes a current detection resistor. The current inflow end of the current detection resistor is connected to the negative terminal of the drive circuit of the motor in the electric actuator 3, and the current outflow end of the current detection resistor is connected to the positive input terminal of the signal amplification module 6.

[0033] When the electric regulating valve is working, the current sampling temperature drift compensation circuit works synchronously. The drive current of the motor in the electric actuator 3 flows through the current detection resistor, generating a voltage drop on its metal body that is proportional to the current intensity. At the same time, due to the combined effect of the resistor's own power consumption and the ambient temperature, the temperature of the resistor body rises, causing the resistance value to shift positively with the temperature drift coefficient.

[0034] At this time, the original voltage signal output from the current-sensing resistor is transmitted to the non-inverting input of the AD8421 instrumentation amplifier, while the positive voltage of the motor drive is connected to its inverting input. The AD8421 instrumentation amplifier accurately extracts the millivolt-level voltage difference across the current-sensing resistor through its internal differential amplification structure and suppresses common-mode interference. The amplified voltage signal is output from its signal output terminal.

[0035] Meanwhile, the high-precision 5V DC voltage output from the REF5050 reference source is applied to the power input terminal of the NTC thermistor. The NTC thermistor is installed in close contact with the current sensing resistor to synchronize with temperature changes in real time. Its resistance decreases exponentially as the temperature rises, forming a voltage divider signal that is negatively correlated with temperature at the signal output terminal of the NTC thermistor. This signal is transmitted to the non-inverting input terminal of the ADA4528 operational amplifier through the first voltage divider resistor.

[0036] The ADA4528 operational amplifier receives a current sampling voltage from the AD8421 instrumentation amplifier at its inverting input and a temperature-indicating voltage from an NTC thermistor at its non-inverting input. The two signals are subtracted by an internal high-gain error amplifier. When the resistance of the current sensing resistor increases due to temperature rise, the sampling voltage output by the AD8421 instrumentation amplifier will be higher than the corresponding value of the actual current. Simultaneously, the voltage division signal generated by the NTC thermistor due to the same temperature rise decreases. This decrease is amplified by the inverting amplifier of the ADA4528 operational amplifier to form a negative compensation voltage, which is algebraically superimposed on the excessively high current sampling voltage at the summation point of the ADA4528 operational amplifier.

[0037] During this process, the gain setting resistor connected between the output terminal and the inverting input terminal of the ADA4528 operational amplifier, together with the compensation gain resistor connected in series in the output path, sets a precise compensation ratio to ensure that the positive error in current sampling introduced by each degree Celsius increase in temperature is exactly canceled out by the reverse compensation voltage generated by the ADA4528 operational amplifier.

[0038] Finally, the corrected voltage signal, after real-time temperature compensation, is output from the signal output terminal of the ADA4528 operational amplifier. After being current-limited by the compensation gain resistor, it is transmitted to the controller through the analog-to-digital converter.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric regulating valve for a water pipe system, characterized in that, The device includes an electric actuator (3), a controller electrically connected to the electric actuator (3), and a current sampling temperature drift compensation circuit electrically connected between the motor and the controller in the electric actuator (3). The current sampling temperature drift compensation circuit includes a current detection module (5), a signal amplification module (6), a reference voltage module (7), a temperature sensing module (8), and a compensation calculation module (9). The current detection module (5) receives the drive current of the motor in the electric actuator (3). The output terminal of the compensation calculation module (9) is connected to the input terminal of the controller. The current signal output terminal of the current detection module (5) is connected to the non-inverting input terminal of the signal amplification module (6). The voltage output terminal of the signal amplification module (6) is connected to the inverting input terminal of the compensation calculation module (9). The temperature signal output terminal of the temperature sensing module (8) is connected to the non-inverting input terminal of the compensation calculation module (9). The reference voltage output terminal of the reference voltage module (7) is connected to the voltage input terminal of the temperature sensing module (8). The compensation signal output terminal of the compensation calculation module (9) is connected to the input terminal of the compensation gain resistor.

2. The electric regulating valve for a water pipe system according to claim 1, characterized in that, The signal amplification module (6) includes an AD8421 instrumentation amplifier, a first filter capacitor, and a second filter capacitor. The inverting input terminal of the AD8421 instrumentation amplifier is connected to the positive drive terminal of the motor in the electric actuator (3). The reference terminal of the AD8421 instrumentation amplifier is grounded. The positive power supply terminal of the AD8421 instrumentation amplifier is connected to a +12V power supply. The positive power supply terminal of the AD8421 instrumentation amplifier is connected to one end of the first filter capacitor, and the other end of the first filter capacitor is grounded. The negative power supply terminal of the AD8421 instrumentation amplifier is connected to -12V. The negative power supply terminal of the AD8421 instrumentation amplifier is connected to one end of the second filter capacitor, and the other end of the second filter capacitor is grounded. The signal output terminal of the AD8421 instrumentation amplifier is connected to the inverting input terminal of the compensation operation module (9) after being connected in series with a current limiting resistor.

3. The electric regulating valve for a water pipe system according to claim 1, characterized in that, The compensation operation module (9) includes an ADA4528 operational amplifier, a gain setting resistor, and a compensation gain resistor. The inverting input terminal of the ADA4528 operational amplifier is connected to the voltage output terminal of the signal amplification module (6). The non-inverting input terminal of the ADA4528 operational amplifier is connected to the temperature signal output terminal of the temperature sensing module (8). The signal output terminal of the ADA4528 operational amplifier is connected to the input terminal of the compensation gain resistor. The output terminal of the compensation gain resistor is used to connect to the controller through an analog-to-digital converter. The gain setting resistor is connected between the signal output terminal and the inverting input terminal of the ADA4528 operational amplifier.

4. The electric regulating valve for a water pipe system according to claim 1, characterized in that, The temperature sensing module (8) includes an NTC thermistor, a first voltage divider resistor, and a second voltage divider resistor. The power input terminal of the NTC thermistor is connected to the reference voltage output terminal of the reference voltage module (7). The signal output terminal of the NTC thermistor is connected to one end of the first voltage divider resistor and one end of the second voltage divider resistor. The other end of the first voltage divider resistor is connected to the non-inverting input terminal of the compensation calculation module (9), and the other end of the second voltage divider resistor is grounded.

5. The electric regulating valve for a water pipe system according to claim 1, characterized in that, The reference voltage module (7) includes a REF5050 reference source. The power input terminal of the REF5050 reference source is connected to a +12V power supply. The reference voltage output terminal of the REF5050 reference source is connected to the voltage input terminal of the temperature sensing module (8). The ground terminal of the REF5050 reference source is grounded.

6. The electric regulating valve for a water pipe system according to claim 1, characterized in that, The current detection module (5) includes a current detection resistor. The current inflow end of the current detection resistor is connected to the negative terminal of the drive circuit of the motor in the electric actuator (3), and the current outflow end of the current detection resistor is connected to the positive input terminal of the signal amplification module (6).

7. The electric regulating valve for a water pipe system according to claim 1, characterized in that, It also includes a valve body (1), a valve core disposed in the valve body (1), a connecting frame (2) fixedly connected to the valve body (1), and a valve stem (4) connected to the valve core and passing through the valve body (1) to the outside. The electric actuator (3) is fixedly connected to the connecting frame (2), and the movable end of the electric actuator (3) is connected to the valve stem (4) in a transmission connection.

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