Direct-current brushless circulating pump with water shortage protection
By designing sampling modules and control modules in DC brushless circulation pumps, the current value and speed of the motor are collected, and the intelligent protection of the motor is achieved, which solves the problem of motor damage when there is insufficient liquid and reduces costs.
Patent Information
- Application Number
- CN202421262559.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-04
AI Technical Summary
During the liquid transport process of the circulation pump, insufficient liquid can easily lead to damage to the motor, and the existing liquid level detection device is expensive and it is difficult to achieve effective protection.
A brushless DC circulating pump with water shortage protection is designed. The output current of the power module is collected through the sampling module, and the sampling voltage is formed and then transmitted to the control module to calculate the current value and speed of the motor. When the speed is higher than the preset threshold, the control module controls the power module to shut down to realize the restart and protection of the motor.
It realizes intelligent judgment of the operating status of the motor, and intelligently controls the start and shutdown of the motor to protect the motor, reducing costs.
Smart Images
Figure CN222638153U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a circulation pump, in particular to a direct current brushless circulation pump with water shortage protection. Background Art
[0002] A circulation pump is a device mainly used for circulating liquids. It is widely used in many fields such as industry, medical field, and laboratory because of its fast and efficient liquid transportation, stability and accuracy, and ability to adapt to various complex environments.
[0003] In the process of liquid transportation (such as water), the liquid plays the role of medium and lubrication in the pump. When the liquid is insufficient and in a water-deficient state, there is a lack of lubricating medium between the rotor and the stator in the motor, but the circulating pump is still in operation, which can easily lead to motor damage. Therefore, in order to ensure the integrity of the motor, the liquid level will be monitored during the process of using the circulating pump for liquid transportation. However, the liquid level detection devices on the market currently usually use sensors. In the actual detection process, in order to ensure the accuracy and stability of the detection results, a lot of costs need to be invested. Utility Model Content
[0004] In order to solve the problems in the related art, the present application provides a DC brushless circulation pump with water shortage protection, which solves the problem of high investment cost.
[0005] The technical solution is as follows:
[0006] A brushless DC circulation pump with water shortage protection comprises: a control module, a power module and a motor; the input end of the power module is used to be connected to an external power supply, the output end of the power module is adapted to be connected to the motor, and the control module is adapted to be connected to the power module to control the power module to be turned on and off; the pump is characterized in that it also comprises a sampling module, which is adapted to be connected to the power module and the control module, the sampling module is used to collect the output current of the power module to form a sampling voltage, and transmit the sampling voltage to the control module, the control module obtains the current value of the motor according to the sampling voltage, and obtains the rotation speed of the motor through the current value, and when the rotation speed is higher than a preset threshold, the control module controls the power module to be turned off.
[0007] Through the above technical solution, the output current of the power module is collected by the sampling module, and after the sampling voltage is formed and transmitted to the control module, the control module calculates the current value of the motor, and the built-in module in the control module calculates the speed of the motor through the current value of the motor. When the motor operating current and speed obtained by the single-chip microcomputer are higher than the preset current and speed thresholds, it is determined that the motor is in an abnormal operating state. At this time, the control module controls the power module to first turn off and then turn on to restart the motor; when the control module determines that the number of motor restarts is greater than the preset threshold, the power module is controlled to be always turned off, so that the motor is in a standby state and waits for maintenance. Intelligent judgment of the operating state of the motor is realized, and the motor can be protected by intelligently controlling the start and shutdown of the motor, thereby effectively reducing costs.
[0008] Preferably, the power module includes three chips of model WPS6946; pins G1 of the three chips are respectively connected to gate resistors RL, and the other ends of the three gate resistors RL are connected to pin 5 of the control module; pins G2 of the three chips are respectively connected to gate resistors RH, and the other ends of the three gate resistors RH are connected to pin 2 of the control module, and pins D1 and D2 of the three chips are respectively connected to the U phase, V phase and W phase of the motor; pins S2 of the three chips are all used to be connected to an external power supply; pins S1 of the three chips are all connected to the sampling current resistor RS1 in the sampling module, and the other end of the sampling current resistor RS1 is grounded.
[0009] Preferably, one end of the current limiting resistor R7 and the current limiting resistor R8 in the sampling module are respectively connected to the two ends of the sampling current resistor RS1, and the other end of the current limiting resistor R7 and the current limiting resistor R8 are respectively connected to pin 19 and pin 20 of the built-in operational amplifier in the control module.
[0010] Preferably, one end of the filter capacitor C6 in the sampling module is connected to the current limiting resistor R7, and the other end of the filter capacitor C6 in the sampling module is connected to the current limiting resistor R8.
[0011] Preferably, the resistor R4 and the capacitor C9 in the sampling module form an RC filter, and the pin 18 of the control module is connected to the pin 17 of the control module through the RC filter to output the current value of the motor.
[0012] Preferably, pin 8 of the control module is used to connect to the positive electrode of the external power supply, pin 9 of the control module is used to connect to the negative electrode of the external power supply, and the negative electrode of the external power supply is grounded, and pin 10 of the control module is connected to VDD with a voltage of 5V; pin 10 of the control module is connected to capacitor C8, resistor R1 and resistor R2, the other end of the capacitor C8 is connected to the negative electrode of the external power supply, and the other ends of the resistor R1 and the resistor R2 are both connected to the positive electrode of the external power supply; the positive electrode of the external power supply is connected to capacitor C8, and the other end of capacitor C8 is connected to the negative electrode of the external power supply.
[0013] Preferably, the pin 12 of the control module is connected to a capacitor C4, and the other end of the capacitor C4 is grounded.
[0014] To sum up, the beneficial effect of the utility model is that the output current of the power module is collected by the sampling module, and after the sampling voltage is formed and transmitted to the control module, the control module calculates the current value of the motor, and the built-in module in the control module calculates the speed of the motor through the current value of the motor. When the motor operating current and speed obtained by the single-chip microcomputer are higher than the preset current and speed thresholds, it is determined that the motor is in an abnormal operating state. At this time, the control module controls the power module to be turned off and then turned on to restart the motor; when the control module determines that the number of motor restarts is greater than the preset threshold, the power module is controlled to be always turned off, so that the motor is in standby state, waiting for maintenance, realizing intelligent judgment of the operating state of the motor and can protect the motor by intelligently controlling the start and shutdown of the motor, thereby effectively reducing costs.
[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0017] Figure 1 This is a principle block diagram of a DC brushless circulation pump with water shortage protection;
[0018] Figure 2 The internal schematic diagram of a power module in a brushless DC circulating pump with water shortage protection;
[0019] Figure 3 The internal schematic diagram of a sampling module in a DC brushless circulation pump with water shortage protection;
[0020] Figure 4 The internal schematic diagram of a control module in a brushless DC circulating pump with water shortage protection;
[0021] Figure 5 This is a motor protection schematic diagram for a brushless DC circulating pump with water shortage protection;
[0022] In the figure, 1. control module; 2. power module; 3. motor; 4. sampling module. DETAILED DESCRIPTION
[0023] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of devices and methods consistent with some aspects of the utility model as detailed in the attached claims.
[0024] In a possible embodiment, as shown in the attached Figure 1-5 As shown, a DC brushless circulation pump with water shortage protection includes: a control module 1, a power module 2 and a motor 3; the input end of the power module 2 is used to be connected to an external power supply, the output end of the power module 2 is adapted to be connected to the motor 3, the control module 1 is adapted to be connected to the power module 2, and is used to control the power module 2 to be turned on and off; it also includes a sampling module 4, the sampling module 4 is adapted to be connected to the power module 2 and the control module 1, the sampling module 4 is used to collect the output current of the power module 2 to form a sampling voltage, and transmit the sampling voltage to the control module 1, the control module 1 obtains the current value of the motor 3 according to the sampling voltage, and obtains the speed of the motor 3 through the current value, when the speed is higher than the preset threshold, the control module 1 controls the power module 2 to be turned off;
[0025] The sampling module 4 collects the output current of the power module 2, forms a sampling voltage and transmits it to the control module 1. The control module 1 calculates the current value of the motor 3. The built-in module in the control module 1 calculates the speed of the motor 3 through the current value of the motor 3. When the operating current and speed of the motor 3 obtained by the single-chip microcomputer are higher than the preset current and speed thresholds, it is determined that the motor 3 is in an abnormal operating state. At this time, the control module 1 controls the power module 2 to be turned off and then turned on to restart the motor 3; when the control module 1 determines that the number of times the motor 3 is restarted is greater than the preset threshold, the power module 2 is controlled to be always turned off, so that the motor 3 is in a standby state and waits for maintenance. The intelligent judgment of the operating state of the motor 3 is realized and the protection of the motor 3 can be achieved by intelligently controlling the start and shutdown of the motor 3, thereby effectively reducing costs.
[0026] The power module 2 includes three chips of model WPS6946; the pins G1 of the three chips are respectively connected to the gate resistors RL, and the other ends of the three gate resistors RL are connected to the pin 5 of the control module 1; the pins G2 of the three chips are respectively connected to the gate resistors RH, and the other ends of the three gate resistors RH are adapted to be connected to the pin 2 of the control module 1, and the pins D1 and D2 of the three chips are respectively adapted to be connected to the U phase, V phase and W phase of the motor 3; the pins S2 of the three chips are all used to be connected to an external power supply; the pins S1 of the three chips are adapted to be connected to the sampling current resistor RS1 in the sampling module 4, and the other end of the sampling current resistor RS1 is grounded.
[0027] like Figure 2 As shown, the three chips are chip U3, chip U4 and chip U5; the gate resistor RH connected to the pin G2 of chip U3 is R25, the gate resistor RL connected to the pin G1 of chip U3 is R26, the gate resistor RH connected to the pin G2 of chip U4 is R37, the gate resistor RL connected to the pin G1 of chip U4 is R38, the gate resistor RH connected to the pin G2 of chip U5 is R39, and the gate resistor RL connected to the pin G1 of chip U3 is R44. The three gate resistors RH and the three gate resistors RL are all resistors with a resistance value of 10Ω, a power of 0.1W, an accuracy of 1%, and packaged in the R0603 packaging method; the power of the sampling resistor RS1 is 2W, the accuracy of the sampling resistor RS1 is 1%, and the sampling resistor RS1 is packaged in a manner of 2.5mm in length, 1.25mm in width and 0.65mm in height, that is, in the R2512 packaging method;
[0028] One end of the current limiting resistor R7 and the current limiting resistor R8 in the sampling module 4 are respectively connected to the two ends of the sampling current resistor RS1, and the other ends of the current limiting resistor R7 and the current limiting resistor R8 are respectively connected to the pin 19 and the pin 20 of the built-in operational amplifier in the control module 1; one end of the filter capacitor C6 in the sampling module 4 is connected to the current limiting resistor R7, and the other end of the filter capacitor C6 in the sampling module 4 is connected to the current limiting resistor R8; Figure 3 As shown, the current limiting resistor R7 and the current limiting resistor R8 are both packaged with a resistance of 2000Ω, a power of 0.1W, an accuracy of 1%, and a length of 2.5mm, a width of 1.25mm and a height of 0.65mm; the capacitor C6 has a capacity of 100μμF, a withstand voltage of 50V and is packaged in the C0603 packaging method.
[0029] The resistor R4 and the capacitor C9 in the sampling module 4 form an RC filter, and the pin 18 of the control module 1 is connected to the pin 17 of the control module 1 through the RC filter, and is used to output the current value of the motor 3; the pin 8 of the control module 1 is used to be connected to the positive electrode of the external power supply, the pin 9 of the control module 1 is used to be connected to the negative electrode of the external power supply, and the negative electrode of the external power supply is grounded, and the pin 10 of the control module 1 is connected to the VDD with a voltage of 5V; the pin 10 of the control module 1 is connected to the capacitor C8, the resistor R1 and the resistor R2, the other end of the capacitor C8 is connected to the negative electrode of the external power supply, and the other ends of the resistors R1 and R2 are both connected to the positive electrode of the external power supply; the positive electrode of the external power supply is connected to the capacitor C8, and the other end of the capacitor C8 is connected to the negative electrode of the external power supply; the filter circuit includes a resistor R4 and a capacitor C9, one end of the resistor R4 is connected to the output end of the operational amplifier, and a packaged resistor with a resistance of 10KΩ, a power of 0.1W, an accuracy of 1%, and a packaging method of R0603 is adopted; the other end of the resistor R4 is connected to one end of the capacitor C9, and the other end of the capacitor C9 is grounded;
[0030] like Figure 3 As shown, the resistance values of the resistor R1 and the resistor R2 are both 200Ω, the capacitor C8 has a capacitance of 1μF, a withstand voltage of 25V, and is packaged in a C0603 packaging method; the capacitor C9 has a capacitance of 1μF, a withstand voltage of 50V, and is packaged in a C0603 packaging method.
[0031] Pin 12 of the control module 1 is connected to a capacitor C4, and the other end of the capacitor C4 is grounded; Figure 4 As shown, the control module 1 adopts a chip U1 of model FU6832S.
[0032] Principle of use: Figure 5 As shown, the control module 1 controls the operation and shutdown of the motor 3 by controlling three chips. During the operation, the pin 18 of the control module 1 outputs current in the form of analog voltage, and then the control module 1 calculates the speed of the motor 3. When the control module 1 determines that the speed and current are both within the set threshold, it is determined that the motor 3 is operating normally; when the control module 1 determines that the speed and current exceed the set threshold, it is determined that the motor 3 is in an abnormal condition, the control module 1 controls the power module 2 to shut down, so that the motor 3 stops, and then controls the motor 3 to restart again, and counts the number of motor 3 protection times as 1. When the control module 1 determines that the number of motor 3 protection times is greater than or equal to 5 times, it controls the power module 2 to shut down, so that the motor 3 is in a shutdown state waiting for maintenance.
[0033] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the present invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not present in the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.
[0034] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims
1. A DC brushless circulation pump with water shortage protection, comprising: Control module, power module and motor; the input end of the power module is used to be connected to an external power supply, the output end of the power module is adapted to be connected to the motor, and the control module is adapted to be connected to the power module to control the on and off of the power module; it is characterized in that it also includes a sampling module, the sampling module is adapted to be connected to the power module and the control module, the sampling module is used to collect the output current of the power module to form a sampling voltage, and transmit the sampling voltage to the control module, the control module obtains the current value of the motor according to the sampling voltage, and obtains the speed of the motor through the current value, when the speed is higher than the preset threshold, the control module controls the power module to shut down.
2. A DC brushless circulating pump with water shortage protection according to claim 1, characterized in that: The power module includes three chips of model WPS6946; the pins G1 of the three chips are respectively connected to the gate resistors RL, and the other ends of the three gate resistors RL are connected to the pin 5 of the control module; the pins G2 of the three chips are respectively connected to the gate resistors RH, and the other ends of the three gate resistors RH are connected to the pin 2 of the control module, and the pins D1 and D2 of the three chips are respectively connected to the U phase, V phase and W phase of the motor; the pins S2 of the three chips are all used to be connected to an external power supply; the pins S1 of the three chips are all connected to the sampling current resistor RS1 in the sampling module, and the other end of the sampling current resistor RS1 is grounded.
3. A DC brushless circulating pump with water shortage protection according to claim 2, characterized in that: One end of the current limiting resistor R7 and the current limiting resistor R8 in the sampling module are respectively connected to the two ends of the sampling current resistor RS1, and the other end of the current limiting resistor R7 and the current limiting resistor R8 are respectively connected to pin 19 and pin 20 of the built-in operational amplifier in the control module.
4. A brushless DC circulating pump with water shortage protection according to claim 3, characterized in that: One end of the filter capacitor C6 in the sampling module is connected to the current limiting resistor R7, and the other end of the filter capacitor C6 in the sampling module is connected to the current limiting resistor R8.
5. A brushless DC circulating pump with water shortage protection according to claim 1, characterized in that: The resistor R4 and the capacitor C9 in the sampling module form an RC filter, and the pin 18 of the control module is connected to the pin 17 of the control module through the RC filter to output the current value of the motor.
6. A brushless DC circulating pump with water shortage protection according to claim 1, characterized in that: Pin 8 of the control module is used to connect to the positive electrode of the external power supply, pin 9 of the control module is used to connect to the negative electrode of the external power supply, and the negative electrode of the external power supply is grounded, and pin 10 of the control module is connected to VDD with a voltage of 5V; Pin 10 of the control module is connected to capacitor C8, resistor R1 and resistor R2, the other end of the capacitor C8 is connected to the negative electrode of the external power supply, and the other ends of the resistor R1 and the resistor R2 are both connected to the positive electrode of the external power supply; the positive electrode of the external power supply is connected to capacitor C8, and the other end of the capacitor C8 is connected to the negative electrode of the external power supply.
7. A DC brushless circulating pump with water shortage protection according to claim 1, characterized in that: The pin 12 of the control module is connected to a capacitor C4, and the other end of the capacitor C4 is grounded.