Household variable frequency heat pump unit

Abstract

The utility model discloses a household variable frequency heat pump unit, belongs to the technical field of heat pump units, and solves the problems that dust is not cleaned in time, an impeller is stressed unevenly and vibrates when a fan works after being used for a long time, and noise is high when the whole heat pump unit works. Comprising a case, a fan motor fixedly connected into the case, an impeller fixedly connected to a rotor shaft in the fan motor and a wind speed control circuit coupled with the fan motor, and the wind speed control circuit collects the vibration condition of the rotor shaft in the fan motor after the fan motor is started and controls the fan motor to rotate at a high speed for three times and five seconds within 30 seconds. The power supply module supplies power, the vibration detection module detects the vibration condition of a rotor shaft of the fan motor, and after the vibration condition exceeds a threshold value, the logic control module and the power driving module control the fan motor to rotate at a high speed for 3 times and 5 seconds within 30 seconds and clean the dust of an impeller without continuously rotating at a high speed, so that the noise is avoided.

Description

Technical Field

[0001] This utility model relates to the field of heat pump unit technology, and in particular to a residential variable frequency heat pump unit. Background Technology

[0002] A heat pump unit is a highly efficient and energy-saving cooling and heating device. Its principle is based on the reverse Carnot cycle, consuming a small amount of high-grade energy to absorb heat from a low-temperature heat source and transfer it to a high-temperature heat source to achieve cooling or heating functions. It mainly consists of components such as a compressor, condenser, evaporator, and expansion valve, with the compressor being the core component responsible for driving the refrigerant circulation. Heat pump units are characterized by high energy efficiency, significantly reducing energy consumption compared to traditional air conditioners or boilers. They also operate smoothly, with low noise and a long service life. Furthermore, they possess good environmental adaptability, operating stably under various climatic conditions. Heat pump units are widely used in residential, commercial buildings, and industrial sites, meeting both winter heating needs and summer cooling services. Some models can even provide domestic hot water, achieving multiple functions in one unit. With continuous technological advancements, the performance and efficiency of heat pump units are constantly improving, making them an important choice for modern building energy conservation and creating comfortable environments.

[0003] However, when the heat pump unit is placed in a relatively dry environment, dust will inevitably accumulate on the impeller of the fan in the heat pump unit due to environmental issues. If the dust is not cleaned in time, the impeller will vibrate due to uneven force when the fan is working after a long period of use, resulting in a lot of noise when the entire heat pump unit is working.

[0004] Therefore, a household variable frequency heat pump unit 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 a household variable frequency heat pump unit.

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

[0007] A residential variable frequency heat pump unit includes a casing, a fan motor fixedly connected inside the casing, an impeller fixedly connected to the rotor shaft of the fan motor, and a wind speed control circuit coupled to the fan motor. The wind speed control circuit collects the vibration at the rotor shaft of the fan motor after the fan motor is turned on and controls the fan motor to rotate at high speed for 3 times, 5 seconds each time, within 30 seconds.

[0008] Preferably, the wind speed control circuit includes a power supply module, a vibration detection module, a logic control module, a power drive module, a status indication module, and a manual control module;

[0009] The input terminal of the power module is connected to a 24V DC power supply, and its output terminal supplies power to the vibration detection module, logic control module, power drive module and status indication module respectively.

[0010] The signal output terminal of the vibration detection module is connected to the input terminal of the logic control module. The vibration detection module is used to collect the vibration signal of the fan rotor and output the threshold comparison result.

[0011] The output of the logic control module is connected to the control terminal of the power drive module. The logic control module receives the threshold comparison result and generates a control signal of three 5-second acceleration pulses within a 30-second cycle when the vibration exceeds the limit.

[0012] The power output terminal of the power drive module is connected to the fan motor. The power drive module receives control signals and drives the fan motor to run at high speed intermittently.

[0013] The input terminal of the status indicator module is connected to the voltage output terminal of the power supply module and the status signal output terminal of the logic control module, respectively. The status indicator module displays the power supply status and vibration over-limit alarm in real time.

[0014] The test signal output terminal of the manual control module is connected to the input terminal of the vibration detection module, and its reset signal output terminal is connected to the reset terminal of the logic control module. The manual control module provides manual test signal input and system reset functions.

[0015] Preferably, the power supply module includes a DC-DC converter LM2596, an LDO regulator AMS1117, and a reverse diode 1N5408. The input pin of the DC-DC converter LM2596 is connected to the 24V positive terminal via the reverse diode 1N5408. The output pin of the DC-DC converter LM2596 outputs a 12V voltage. The input pin of the LDO regulator AMS1117 is connected to a 12V power supply. The output pin of the LDO regulator AMS1117 outputs a 5V voltage. The feedback pin of the DC-DC converter LM2596 is configured with an output voltage through a resistor divider network. The ground pin of the DC-DC converter LM2596 is grounded.

[0016] Preferably, the vibration detection module includes a piezoelectric sensor LDT0-028K, an operational amplifier LM358, and a voltage comparator LM393. The detection terminal of the piezoelectric sensor LDT0-028K is in contact with the rotor shaft of the fan motor. The positive terminal of the piezoelectric sensor LDT0-028K is connected to the non-inverting input terminal of the operational amplifier, and its negative terminal is grounded. The output terminal of the operational amplifier LM358 is connected to the non-inverting input terminal of the voltage comparator LM393 via a bandpass filter circuit. The inverting input terminal of the voltage comparator LM393 is connected to an adjustable threshold voltage.

[0017] Preferably, the logic control module includes a first timer NE555, a second timer NE555, and a dual monostable multivibrator CD4528. The first timer NE555 is in monostable mode, and its trigger terminal receives the output signal from the vibration detection module. The output terminal of the first timer NE555 is connected to the trigger terminal of the dual monostable multivibrator CD4528. The second timer NE555 is a multivibrator, and its output terminal is connected to the reset terminal of the dual monostable multivibrator CD4528. The output terminal of the dual monostable multivibrator CD4528 generates a three-pulse signal through a diode logic network.

[0018] Preferably, the power drive module includes a MOSFET IRF540N and a JQC-3FF-SZ relay. The gate of the MOSFET IRF540N is connected to the output terminal of the logic control module, the drain of the MOSFET IRF540N is connected to the positive terminal of the relay coil, the source of the MOSFET IRF540N is grounded, the normally open contact of the JQC-3FF-SZ relay is connected in series with the fan motor power line, and a freewheeling diode 1N4007 is connected in parallel across the coil of the JQC-3FF-SZ relay.

[0019] Preferably, the status indication module includes a dual-color LED fixedly connected to the chassis. The dual-color LED includes a red anode, a green anode, and a common cathode. The red anode is connected to the alarm signal terminal of the logic control module via a resistor, the green anode is connected to the 5V output terminal of the power supply module via a resistor, and the common cathode is grounded.

[0020] Preferably, the manual control module has a test button and a reset button. One end of the test button is connected to a 5V power supply, and the other end is connected to the input terminal of the vibration detection module via a voltage divider resistor. One end of the reset button is connected to the reset terminal of the logic control module, and the other end is grounded.

[0021] This utility model has the following beneficial effects:

[0022] When this utility model is in operation, if it is started, the power module will supply power to each module, and then the vibration detection module will detect the vibration of the fan motor rotor shaft. If the vibration exceeds the threshold, the logic control module and power drive module will control the fan motor to make the fan motor rotate at high speed three times for 5 seconds within 30 seconds. In this way, the fan motor can rotate at high speed to shake off a certain amount of dust attached to the impeller. At the same time, the fan motor will not continuously rotate at high speed after starting, avoiding the noise of continuous high-speed rotation in order to shake off dust. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 This is a structural block diagram of the wind speed control circuit in this utility model.

[0027] 1. Chassis; 2. Fan motor; 3. Impeller; 4. Power supply module; 5. Vibration detection module; 6. Logic control module; 7. Power drive module; 8. Status indication module; 9. Manual control module. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] 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.

[0034] A type of residential variable frequency heat pump unit, such as Figure 1 As shown, it includes a housing 1, a fan motor 2 fixedly connected inside the housing 1, an impeller 3 fixedly connected to the rotor shaft of the fan motor 2, and a wind speed control circuit coupled to the fan motor 2. After the fan motor 2 is turned on, the wind speed control circuit collects the vibration at the rotor shaft of the fan motor 2 and controls the fan motor 2 to perform three 5-second high-speed rotations within 30 seconds.

[0035] like Figure 2 As shown, the wind speed control circuit includes a power supply module 4, a vibration detection module 5, a logic control module 6, a power drive module 7, a status indication module 8, and a manual control module 9.

[0036] The input terminal of power module 4 is connected to a 24V DC power supply, and its output terminals supply power to vibration detection module 5, logic control module 6, power drive module 7, and status indication module 8, respectively. The signal output terminal of vibration detection module 5 is connected to the input terminal of logic control module 6. Vibration detection module 5 is used to collect the vibration signal of the fan rotor and output the threshold comparison result. The output terminal of logic control module 6 is connected to the control terminal of power drive module 7. Logic control module 6 receives the threshold comparison result and generates a control signal of three 5-second acceleration pulses within a 30-second cycle when the vibration exceeds the limit. The power output terminal of power drive module 7 is connected to fan motor 2. Power drive module 7 receives the control signal and drives fan motor 2 to run at high speed intermittently. The input terminal of status indication module 8 is connected to the voltage output terminal of power module 4 and the status signal output terminal of logic control module 6, respectively. Status indication module 8 displays the power status and vibration over-limit alarm in real time. The test signal output terminal of manual control module 9 is connected to the input terminal of vibration detection module 5, and its reset signal output terminal is connected to the reset terminal of logic control module 6. Manual control module 9 provides manual test signal input and system reset functions.

[0037] Power module 4 includes a DC-DC converter LM2596, an LDO regulator AMS1117, and a reverse diode 1N5408. The input pin of the DC-DC converter LM2596 is connected to the 24V positive terminal via the reverse diode 1N5408. The output pin of the DC-DC converter LM2596 outputs a 12V voltage. The input pin of the LDO regulator AMS1117 is connected to the 12V power supply. The output pin of the LDO regulator AMS1117 outputs a 5V voltage. The feedback pin of the DC-DC converter LM2596 is configured with an output voltage through a resistor divider network. The ground pin of the DC-DC converter LM2596 is grounded.

[0038] The vibration detection module 5 includes a piezoelectric sensor LDT0-028K, an operational amplifier LM358, and a voltage comparator LM393. The detection terminal of the piezoelectric sensor LDT0-028K is in contact with the rotor shaft of the fan motor 2. The positive terminal of the piezoelectric sensor LDT0-028K is connected to the non-inverting input terminal of the operational amplifier, and its negative terminal is grounded. The output terminal of the operational amplifier LM358 is connected to the non-inverting input terminal of the voltage comparator LM393 through a bandpass filter circuit. The inverting input terminal of the voltage comparator LM393 is connected to an adjustable threshold voltage.

[0039] The logic control module 6 includes a first timer NE555, a second timer NE555, and a dual monostable multivibrator CD4528. The first timer NE555 is in monostable mode, and its trigger terminal receives the output signal from the vibration detection module 5. The output terminal of the first timer NE555 is connected to the trigger terminal of the dual monostable multivibrator CD4528. The second timer NE555 is a multivibrator, and its output terminal is connected to the reset terminal of the dual monostable multivibrator CD4528. The output terminal of the dual monostable multivibrator CD4528 generates a 3-pulse signal through a diode logic network.

[0040] The power drive module 7 includes a MOSFET IRF540N and a JQC-3FF-SZ relay. The gate of the MOSFET IRF540N is connected to the output terminal of the logic control module 6, the drain of the MOSFET IRF540N is connected to the positive terminal of the relay coil, and the source of the MOSFET IRF540N is grounded. The normally open contact of the JQC-3FF-SZ relay is connected in series with the power supply line of the fan motor 2, and a freewheeling diode 1N4007 is connected in parallel across the coil of the JQC-3FF-SZ relay.

[0041] The status indicator module 8 includes a dual-color LED fixedly connected to the chassis 1. The dual-color LED includes a red anode, a green anode, and a common cathode. The red anode is connected to the alarm signal terminal of the logic control module 6 via a resistor, the green anode is connected to the 5V output terminal of the power supply module 4 via a resistor, and the common cathode is grounded.

[0042] The manual control module 9 has a test button and a reset button. One end of the test button is connected to a 5V power supply, and the other end is connected to the input terminal of the vibration detection module 5 through a voltage divider resistor. One end of the reset button is connected to the reset terminal of the logic control module 6, and the other end is grounded.

[0043] The fan motor 2 of this invention generates vibration, and then the fan rotor vibration is monitored and speed controlled in real time through a wind speed control circuit. Its working principle is as follows:

[0044] When the fan motor 2 starts, the piezoelectric sensor LDT0-028K in the vibration detection module 5 converts the mechanical vibration into an electrical signal. After being amplified 50 times by the operational amplifier LM358, it passes through a band-pass filter network composed of a high-pass filter consisting of a 1μF capacitor and a 160kΩ resistor and a low-pass filter consisting of a 0.1μF capacitor and a 1.6kΩ resistor to effectively filter out environmental noise interference. Then, it is converted into a DC level signal by the diode absolute value circuit and input to the voltage comparator LM393. When the vibration amplitude exceeds the preset threshold, the voltage comparator LM393 outputs a high level to trigger the first timer NE555 to enter a 30-second monostable mode. At the same time, the second timer NE555 generates a pulse signal with a 5-second cycle. The dual monostable trigger CD4528 accurately controls the output of three 5-second high-speed pulses within the 30-second window. The JQC-3FF-SZ relay is driven by the MOS transistor IRF540N to engage, causing the fan motor 2 to intermittently accelerate within a set time, using centrifugal force to remove dust from the surface of the fan blades.

[0045] During this process, the status indicator module 8 displays the system status in real time through dual-color LEDs. A solid green light indicates normal power supply, while a red light indicates excessive vibration. The manual control module 9 allows users to simulate vibration signals to verify the circuit function via the test button, or to forcibly terminate the acceleration cycle via the reset button.

[0046] In this way, the fan motor 2 will not continuously rotate at high speed after starting, avoiding the noise caused by continuous high-speed rotation in order to shake off dust, reducing the failure rate of the fan motor 2, and having significant energy-saving and emission-reduction value and equipment life extension effect.

[0047] 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. A household variable frequency heat pump unit, characterized in that, The fan motor (2) is fixedly connected in the cabinet (1), the impeller (3) is fixedly connected on the rotor shaft of the fan motor (2), and the wind speed control circuit is coupled with the fan motor (2), wherein the wind speed control circuit collects the vibration condition of the rotor shaft of the fan motor (2) after the fan motor (2) is started and controls the fan motor (2) to rotate at high speed for 3 times of 5 seconds within 30 seconds.

2. The household variable frequency heat pump unit according to claim 1, characterized in that, The wind speed control circuit comprises a power module (4), a vibration detection module (5), a logic control module (6), a power drive module (7), a state indication module (8), and a manual control module (9). The input end of the power module (4) is connected with a 24V DC power supply, and the output end thereof supplies power to the vibration detection module (5), the logic control module (6), the power drive module (7), and the state indication module (8) respectively. The signal output end of the vibration detection module (5) is connected with the input end of the logic control module (6), and the vibration detection module (5) is used for collecting the fan rotor vibration signal and outputting a threshold comparison result. The output end of the logic control module (6) is connected with the control end of the power drive module (7), and the logic control module (6) receives the threshold comparison result and generates a control signal of 3 times of 5-second speed-up pulses within a 30-second period when the vibration is over limit. The power supply output end of the power drive module (7) is connected with the fan motor (2), and the power drive module (7) receives the control signal and drives the fan motor (2) to run at high speed intermittently. The input end of the state indication module (8) is connected with the voltage output end of the power module (4) and the state signal output end of the logic control module (6) respectively, and the state indication module (8) displays the power state and vibration over-limit alarm in real time. The test signal output end of the manual control module (9) is connected with the input end of the vibration detection module (5), and the reset signal output end thereof is connected with the reset end of the logic control module (6), and the manual control module (9) provides an artificial test signal input and a system reset function.

3. The household variable frequency heat pump unit according to claim 2, characterized in that, The power module (4) comprises a DC-DC converter LM2596, an LDO stabilizer AMS1117, and a reverse diode 1N5408, the input pin of the DC-DC converter LM2596 is connected with the positive electrode of the 24V through the reverse diode 1N5408, the output pin of the DC-DC converter LM2596 outputs a 12V voltage, the input pin of the LDO stabilizer AMS1117 is connected with a 12V power supply, the output pin of the LDO stabilizer AMS1117 outputs a 5V voltage, the feedback pin of the DC-DC converter LM2596 is configured to output a voltage through a resistance voltage dividing network, and the ground pin of the DC-DC converter LM2596 is grounded.

4. The household variable frequency heat pump unit according to claim 2, characterized in that, The vibration detection module (5) comprises a piezoelectric sensor LDT0-028K, an operational amplifier LM358, and a voltage comparator LM393, the detection end of the piezoelectric sensor LDT0-028K is in contact with the rotor shaft in the fan motor (2), the positive pole of the piezoelectric sensor LDT0-028K is connected to the non-inverting input end of the operational amplifier, and the negative pole is grounded, the output end of the operational amplifier LM358 is connected to the non-inverting input end of the voltage comparator LM393 through a band-pass filter circuit, and the inverting input end of the voltage comparator LM393 is connected to an adjustable threshold voltage.

5. The household variable frequency heat pump unit according to claim 2, characterized in that, The logic control module (6) comprises a first timer NE555, a second timer NE555, and a dual monostable trigger CD4528, the first timer NE555 is in monostable mode, the trigger end of the first timer NE555 receives the output signal of the vibration detection module (5), the output end of the first timer NE555 is connected to the trigger end of the dual monostable trigger CD4528, the second timer NE555 is a multivibrator, the output end of the second timer NE555 is connected to the reset end of the dual monostable trigger CD4528, and the output end of the dual monostable trigger CD4528 generates a 3-time pulse signal through a diode logic network.

6. The household variable frequency heat pump unit according to claim 2, characterized in that, The power drive module (7) comprises a MOS tube IRF540N and a JQC-3FF-S-Z relay, the gate of the MOS tube IRF540N is connected to the output end of the logic control module (6), the drain of the MOS tube IRF540N is connected to the positive pole of the relay coil, the source of the MOS tube IRF540N is grounded, the normally open contact of the JQC-3FF-S-Z relay is connected in series with the power line of the fan motor (2), and the coil of the JQC-3FF-S-Z relay is connected in parallel with a continuous diode 1N4007 across the coil.

7. The household variable frequency heat pump unit according to claim 2, characterized in that, The state indication module (8) comprises a dual-color LED fixedly connected to the cabinet (1), the dual-color LED comprises a red anode, a green anode, and a common cathode, the red anode is connected to the alarm signal end of the logic control module (6) through a resistor, the green anode is connected to the 5V output end of the power module (4) through a resistor, and the common cathode is grounded.

8. The household variable frequency heat pump unit according to claim 2, characterized in that, The manual control module (9) comprises a test button and a reset button, one end of the test button is connected to a 5V power supply, the other end of the test button is connected to the input end of the vibration detection module (5) through a voltage dividing resistor, one end of the reset button is connected to the reset end of the logic control module (6), and the other end of the reset button is grounded.

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