A fan control device for an air source heat pump water heater

Abstract

The utility model relates to air source heat pump water heater reduce high pressure technical field, and disclose a fan control equipment for air source heat pump water heater, including heat pump system, heat pump system is by evaporimeter, compressor, condenser and expansion valve is composed, and the connecting path is evaporimeter, compressor, condenser, expansion valve, evaporimeter in proper order, and through refrigerant circulation forms closed loop, the heat pump system is equipped with the monitoring module for real -time monitoring system high pressure, the module of control equipment whole working state and the fan drive module of execution fan working state command. The utility model realizes real -time monitoring to high pressure, and according to the different range of high pressure, real -time adjustment fan operating state, realize the initiative adjustment of fan speed, carry out intervention before system pressure is too high, thereby can avoid high pressure protection trigger, greatly reduce the problem of hot water supply interruption, improve user's use experience.

Description

Technical Field

[0001] This utility model relates to the field of high pressure reduction technology for air source heat pump water heaters, specifically a fan control device for air source heat pump water heaters. Background Technology

[0002] An air source heat pump water heater is a highly efficient and energy-saving hot water preparation device. Its working principle is very similar to that of an air conditioner. It uses a small amount of electricity to drive the compressor. The high-pressure liquid working fluid evaporates into a gaseous state in the evaporator after passing through the expansion valve, and absorbs a large amount of heat energy from the air. The gaseous working fluid is compressed into a high-temperature, high-pressure liquid state by the compressor, and then enters the condenser to release heat and heat the water. This cycle continues to heat the water to 50°C~65°C.

[0003] However, during operation, under high temperature and high load conditions, the heat exchange pressure on the condenser side will rise sharply. This will cause the system to operate under high pressure, which will not only increase energy consumption, but may also trigger the high pressure protection switch, causing the unit to start and stop frequently, affecting user experience and equipment lifespan. In severe cases, it may even damage core components such as the compressor.

[0004] In existing technologies, high-pressure protection switches are typically used as safety redundancy. When the system pressure exceeds the safety threshold, the high-pressure protection switch will directly cut off the power supply to the entire unit. This is a "post-event protection" mechanism. Although it ensures safety, it is very passive and abrupt, which can lead to interruption of hot water supply. How to proactively and smoothly reduce system pressure without completely shutting down the unit has become an urgent problem to be solved. Utility Model Content

[0005] In view of the shortcomings of existing high-pressure reduction systems for air source heat pump water heaters mentioned in the background art, this utility model provides a fan control device for air source heat pump water heaters, which can actively adjust the fan speed and intervene before the system pressure is too high, thereby avoiding the triggering of high-pressure protection and ensuring stable and continuous operation of the system.

[0006] This utility model provides the following technical solution: a fan control device for an air source heat pump water heater, including a heat pump system, which consists of an evaporator, a compressor, a condenser, and an expansion valve. The connection path is evaporator → compressor → condenser → expansion valve → evaporator, and a closed loop is formed through refrigerant circulation. The heat pump system is equipped with a monitoring module for real-time monitoring of the system's high pressure, a module for controlling the overall working status of the device, and a fan drive module for executing fan working status commands.

[0007] Furthermore, in an air source heat pump, the evaporator is responsible for absorbing heat from the air and together with the compressor and condenser, forms a closed loop to complete the complete heat pump cycle of "heat absorption-compression-heat release-throttling". Furthermore, the main function of the compressor is to compress the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas, thereby transferring heat from a low-temperature heat source to a high-temperature heat source and realizing a cooling or heating cycle.

[0008] Furthermore, the high-temperature, high-pressure refrigerant gas inside the condenser releases heat, which is absorbed by the water circulation system, thus raising the water temperature.

[0009] Furthermore, the main function of the expansion valve in an air source heat pump is to regulate the refrigerant flow to achieve pressure and temperature drops, thereby controlling the heat absorption efficiency of the evaporator and the heat release of the condenser.

[0010] Furthermore, the monitoring module includes a pressure sensor that can monitor the system's high-pressure level in real time.

[0011] Furthermore, the fan drive module is electrically connected to the control module and the evaporator fan, and can adjust the fan speed or start and stop according to the instructions of the control module. When the fan pressure is at a high level, the fan is controlled to decelerate; when the fan pressure is too high, the fan is controlled to stop; and when the fan pressure drops to a normal level, the fan is controlled to start.

[0012] Furthermore, a fan control method for an air source heat pump water heater includes the following steps: S1. The monitoring module monitors the high pressure of the heat pump system in real time. S2. Compare the monitored operating parameters with the preset first threshold. S3. When the operating parameters reach or exceed the first threshold, the control module controls the fan drive module to reduce the speed of the evaporator fan of the heat pump system or stop its operation.

[0013] Furthermore, the control method is divided into the following phases: Set pressure thresholds P1, P2, and P3; During system operation, the monitoring module monitors the system's high-pressure P_h in real time; When P_h ≥ P1 but P_h < P2, the control module controls the fan drive module to reduce the fan speed from the highest speed to medium speed. If the pressure continues to rise, causing P_h ≥ P2, the control module will control the fan drive module to completely stop the fan. The pressure begins to drop after the fan slows down or stops. When P_h drops to P3, the control module controls the fan drive module to restore the fan to full speed operation.

[0014] Where P1 can be 3.0 MPa, P2 can be 3.3 MPa, and P3 can be 2.7 MPa.

[0015] Furthermore, the control module is electrically connected to the monitoring module and is configured to perform the method described in any of the above-mentioned embodiments.

[0016] This utility model has the following beneficial effects: 1. This utility model achieves real-time monitoring of high pressure and adjusts the fan operation status in real time according to different high pressure ranges, realizing active adjustment of fan speed. It intervenes before the system pressure becomes too high, thereby avoiding the triggering of high pressure protection, greatly reducing the problem of hot water supply interruption, and improving the user experience.

[0017] 2. This utility model can subdivide the system's working pressure range by actively adjusting the fan speed in segments, ensuring the system's working efficiency. At the same time, it can also realize the corresponding pressure reduction operation in a timely manner, avoiding the problem of equipment lifespan issues caused by frequent start-stop of the unit, ensuring that the system can operate stably and continuously, and reducing the wear and tear on core components such as compressors caused by frequent start-stop of the unit. Attached Figure Description

[0018] Figure 1 This is a flowchart of the control logic of this utility model; Figure 2 This is a schematic diagram of the system of this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] A fan control device for an air source heat pump water heater includes a fan control method and system for the air source heat pump water heater.

[0021] An air source heat pump consists of four main components: an evaporator, a compressor, a condenser, and an expansion valve. The evaporator is responsible for absorbing heat from the air and is a key component in heat energy conversion. Together with the compressor and condenser, it forms a closed-loop circuit, completing the full heat pump cycle of "heat absorption-compression-heat release-throttling." The compressor's main function is to compress the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas, driving heat from the low-temperature heat source to the high-temperature heat source, thus achieving a cooling or heating cycle. In heating mode, the high-temperature, high-pressure refrigerant gas releases heat in the condenser, which is absorbed by the water circulation system, raising the water temperature. The expansion valve's main function in an air source heat pump is to regulate the refrigerant flow rate to achieve pressure and temperature drops, thereby controlling the evaporator's heat absorption efficiency and the condenser's heat release process.

[0022] like Figure 2 As shown, when an air source heat pump is working, the refrigerant absorbs heat from the air in the evaporator, changing from a liquid to a gaseous state. Common refrigerants include R32 and R134A. Then, the low-temperature, low-pressure gaseous refrigerant enters the compressor, where it is compressed into a high-temperature, high-pressure gas. This high-temperature, high-pressure gas then enters the condenser and exchanges heat with water, liquefying and releasing heat, thus converting air energy into hot water heat. At the same time, the expansion valve is linked with the compressor and works in coordination with the evaporator / condenser to provide the compressor with low-pressure, low-temperature refrigerant, forming a complete reverse Carnot cycle process. This ensures that the refrigerant fully absorbs heat in the evaporator and efficiently releases heat in the condenser, maintaining the system's energy efficiency ratio.

[0023] The air source heat pump water heater control system consists of a monitoring module, a control module, and a fan drive module. The monitoring module includes a pressure sensor for real-time monitoring of the system's high-pressure output. The fan drive module is electrically connected to the control module and the evaporator fan, and is used to adjust the fan speed or start / stop it according to instructions from the control module. The control module is electrically connected to the monitoring module and controls the monitoring module to monitor the high-pressure output of the heat pump system in real time. Simultaneously, it compares the monitored operating parameters with a preset first threshold. When the operating parameters reach or exceed the first threshold, it controls the evaporator fan speed of the heat pump system to decrease or stop operation.

[0024] The fan control method for air source heat pump water heaters mainly includes the following steps: S1. Real-time monitoring of the high pressure of the heat pump system; S2. Compare the monitored operating parameters with the preset first threshold. S3. When the operating parameters reach or exceed the first threshold, control the speed of the evaporator fan of the heat pump system to decrease or stop operation.

[0025] like Figure 1 As shown, this utility model provides a more refined staged control method: Set pressure thresholds: P1, P2, and P3.

[0026] During system operation, the system high pressure P_h is monitored in real time; When P_h ≥ P1 and P_h < P2, the controller reduces the fan speed from the highest speed to the medium speed. This segmented control can alleviate the high pressure without affecting the system operation, slow down the increase of high pressure, benefit the system operation, and reduce the possibility of high pressure protection triggering. If the pressure continues to rise, causing P_h ≥ P2, the controller will stop the fan completely to avoid triggering the high-pressure protection and prevent the hot water supply from being interrupted suddenly. This allows the air source heat pump water heater to actively and gradually reduce the system pressure without completely shutting down. The pressure begins to drop after the fan slows down or stops. When P_h drops to P3, the controller restores the fan to full speed operation.

[0027] Where P1 can be 3.0 MPa, P2 can be 3.3 MPa, and P3 can be 2.7 MPa.

[0028] The method of use (working principle) of this utility model is as follows: Figure 2 As shown, the invention principle is a reverse Carnot cycle. The evaporator of the air source heat pump allows the refrigerant to continuously evaporate, that is, the refrigerant absorbs heat from the environment, then is compressed by the compressor, and then enters the condenser for condensation, that is, the refrigerant releases heat. After passing through the expansion valve for throttling, it enters the evaporator to realize the thermodynamic cycle process of evaporation, thereby transferring heat from the environment to the medium.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fan control device for an air source heat pump water heater, comprising a heat pump system, characterized in that: The heat pump system consists of an evaporator, a compressor, a condenser, and an expansion valve. The connection path is, in sequence, evaporator, compressor, condenser, expansion valve, and evaporator, forming a closed loop through refrigerant circulation. The heat pump system is equipped with a monitoring module for real-time monitoring of the system's high-pressure, a module for controlling the overall operating status of the equipment, and a fan drive module for executing fan operating status commands.

2. The fan control device for an air source heat pump water heater according to claim 1, characterized in that: The evaporator in the air source heat pump is responsible for absorbing heat from the air and together with the compressor and condenser, forms a closed loop to complete the complete heat pump cycle of "heat absorption-compression-heat release-throttling".

3. The fan control device for an air source heat pump water heater according to claim 1, characterized in that: The main function of the compressor is to compress the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas, thereby transferring heat from a low-temperature heat source to a high-temperature heat source and achieving a cooling or heating cycle.

4. The fan control device for an air source heat pump water heater according to claim 1, characterized in that: The high-temperature, high-pressure refrigerant gas inside the condenser releases heat, which is absorbed by the water circulation system, thus raising the water temperature.

5. A fan control device for an air source heat pump water heater according to claim 1, characterized in that: The expansion valve in an air source heat pump mainly functions to regulate the refrigerant flow rate to achieve pressure and temperature drops, thereby controlling the heat absorption efficiency of the evaporator and the heat release of the condenser.

6. A fan control device for an air source heat pump water heater according to any one of claims 1-5, characterized in that: The monitoring module includes a pressure sensor, which can monitor the system's high pressure in real time.

7. A fan control device for an air source heat pump water heater according to claim 6, characterized in that: The fan drive module is electrically connected to the control module and the evaporator fan. It can adjust the fan speed or start and stop according to the instructions of the control module. When the fan pressure is at a high level, it controls the fan to decelerate. When the fan pressure is too high, it controls the fan to stop. When the fan pressure drops to a normal level, it controls the fan to start.

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