Air source heat pump and control method

Abstract

The invention discloses an air source heat pump and a control method, the heat pump comprises a machine body, a driving plate, a heat dissipation piece and an air duct shell, the machine body is internally provided with a press cavity and a fan cavity which are relatively independent, the fan cavity is internally provided with a first fan, the driving plate is installed in the machine body, the heat dissipation piece is arranged on one side of the driving plate, and the first fan is arranged on the other side of the driving plate. The air channel shell is arranged in the machine body, a heat dissipation channel is formed in the air channel shell, the heat dissipation piece is located in the heat dissipation channel, one end of the heat dissipation channel is communicated with the press cavity, the other end of the heat dissipation channel is communicated with the fan cavity, and a second fan is arranged in the heat dissipation channel. By reasonably arranging the air duct shell with the independent heat dissipation channel and arranging the second fan in the air duct shell to change the air flowing state of the heat dissipation channel, the air flowing state is diversified, and the heat dissipation efficiency of the air-cooled heat dissipation driving plate is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat pumps, and in particular to an air source heat pump and a control method thereof. Background Art

[0002] As an efficient energy conversion device, air source heat pumps have been widely used in the field of modern refrigeration and heating. The driver board, one of its core components, undertakes the important task of controlling the operation of the heat pump system and generates a lot of heat in the process. In order to effectively remove this heat, air-cooled heat dissipation driver boards have become a common choice. This type of driver board usually adopts natural air cooling and heat dissipation, that is, it relies on the flow of natural air to remove heat. In the natural air cooling heat dissipation mechanism, the heat generated by the driver board when it is working will heat the surrounding air, causing the hot air to rise naturally due to the decrease in density. This rising process forms a local low-pressure area, which in turn attracts the surrounding cooler air to replenish it, thereby forming a natural convection phenomenon, which effectively removes heat from the surface of the driver board. However, natural air cooling heat dissipation also has some inherent defects.

[0003] First, its heat dissipation efficiency is relatively low, which is mainly attributed to the slowness and uncertainty of natural air flow. In particular, in high temperature environments or conditions with poor air circulation, the heat dissipation effect will be significantly reduced. This is because high temperature environments will increase the initial temperature of the air, thereby reducing the air's ability to absorb heat; while poor air circulation will reduce the frequency of exchange between hot air and cold air, further affecting the heat dissipation effect.

[0004] Secondly, the natural air cooling method is greatly affected by the ambient temperature and air flow speed. When the ambient temperature is too high or the air flow speed is too slow, the heat dissipation efficiency will drop significantly, causing the IPM (intelligent power module) on the driver board to be too high. This situation will not only limit the increase in the compressor frequency, but may also cause a series of safety hazards, such as overheating protection activation and system performance degradation.

[0005] In order to overcome the limitations of air-cooled heat dissipation, fluorine cold plates have gradually been introduced into air source heat pump systems as a heat dissipation method. Fluorine cold plates use refrigerants (coolants) to circulate in the plate, take away the heat on the driver plate through heat exchange, and discharge it into the external environment. However, the fluorine cold plate system requires the design of complex pipelines to transport the refrigerant. These pipelines not only increase the complexity of the system, but also increase the difficulty of installation and maintenance. During the design and installation process, the flow and pressure of the refrigerant need to be accurately calculated to ensure the efficient operation of the system. At the same time, complex pipelines also increase the risk of leakage in the system. Once the refrigerant leaks, it will directly affect the heat dissipation effect and energy efficiency of the system. Moreover, fluorine cold plates are prone to condensation problems during operation. Since the refrigerant absorbs and releases heat during the circulation process, the surface temperature of the plate body decreases. When the water vapor in the surrounding air encounters the low-temperature plate body, it condenses into water droplets and forms condensation. Condensation not only affects the electrical performance of the driver board, but also may cause safety hazards such as corrosion and short circuit to the system. Therefore, when designing and using fluorine cold plates, effective anti-condensation measures need to be taken, such as adding insulation layers, optimizing refrigerant circulation methods, etc.

[0006] Therefore, under the natural air cooling method, how to effectively improve the heat dissipation efficiency, reduce the temperature of the driver board, and ensure the stable operation of the heat pump system has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] The purpose of the embodiments of the present application is to provide an air source heat pump and a control method, by reasonably setting an air duct shell with an independent heat dissipation channel, and setting a second fan in the air duct shell to change the air flow state of the heat dissipation channel, so as to diversify the air flow state and effectively improve the heat dissipation efficiency of the air-cooled heat dissipation drive plate; and optimize the control logic of the second fan, so that under different load conditions, the operation of the second fan can be accurately controlled to ensure that the IPM temperature of the drive board is within an appropriate range, thereby increasing the compressor frequency and thus improving the capacity and energy efficiency of the heat pump.

[0008] To achieve the above objectives, this application adopts the following technical solutions:

[0009] On the one hand, an air source heat pump is provided, comprising: a body, a drive plate, a heat sink and an air duct shell, wherein a relatively independent compressor chamber and a fan chamber are provided in the body, a first fan is provided in the fan chamber, the drive plate is installed inside the body, the heat sink is provided on one side of the drive plate, the air duct shell is provided inside the body, a heat dissipation channel is formed in the air duct shell, the heat sink is located in the heat dissipation channel, one end of the heat dissipation channel is connected to the compressor chamber, and the other end is connected to the fan chamber, a second fan is provided in the heat dissipation channel, so that the air in the compressor chamber enters from one end of the heat dissipation channel, passes through the heat sink, and is transported to the fan chamber from the other end of the heat dissipation channel.

[0010] Furthermore, the machine body is provided with an air inlet, and the air inlet connects the external environment with the press chamber.

[0011] Furthermore, the heat dissipation channel has a first end and a second end, the first end is connected to the compressor cavity, the second fan is arranged at the second end, and the first end is also provided with a guide member to allow the air in the compressor cavity to enter the heat dissipation channel upward.

[0012] Furthermore, a connecting port connected to the compressor cavity is provided on the side surface of the first end portion, and an air outlet connected to the fan cavity is provided on the top surface of the second end portion.

[0013] Furthermore, the connection port is located below the heat sink.

[0014] Furthermore, the driving plate is installed in the compressor cavity, and the air duct shell is arranged in the fan cavity.

[0015] On the other hand, a control method for an air source heat pump is also provided, which is used for the air source heat pump as described above, and the control method includes: after the air source heat pump is running, the first fan is turned on, and the IPM temperature T of the drive board is monitored in real time. When T﹥T1, the second fan is turned on, where T1 is a preset temperature threshold.

[0016] Furthermore, a compressor is provided in the press chamber, and when T2≤T≤T1, the compressor reduces its operating frequency, wherein T2 is a preset temperature threshold.

[0017] Furthermore, when T≤T3, the compressor stops reducing the frequency and keeps running at the current frequency, wherein T3 is a preset temperature threshold and T3﹤T2.

[0018] Furthermore, when T≤T4, the compressor releases the frequency restriction and increases the operating frequency, wherein T4 is a preset temperature threshold and T4﹤T3.

[0019] Furthermore, after the second fan is turned on, when it is detected that the IPM temperature T of the driving board continues to rise, the operating frequency of the second fan is gradually increased.

[0020] Further, the second fan includes at least a first operating gear, a second operating gear and a third operating gear. When T﹥T1, the second fan operates according to the first operating gear; when T﹥T5, the second fan operates according to the second operating gear; when T﹥T6, the second fan operates according to the third operating gear; wherein, T6﹥T5﹥T1, the operating frequency of the third operating gear is greater than the operating frequency of the second operating gear, and the operating frequency of the second operating gear is greater than the operating frequency of the first operating gear.

[0021] Furthermore, after the second fan is turned on, the external ambient temperature t is detected in real time, and the decrease amplitude of the IPM temperature T of the driving board is set to F. When t﹥t1, T﹥T1 and F﹤F1, the operating frequency of the first fan is increased, and / or the operating frequency of the second fan is increased, wherein t1 is a preset ambient temperature threshold and F is a preset amplitude threshold.

[0022] Furthermore, when the air source heat pump operates in heating mode, the outlet side temperature H of the first fan is detected in real time. When H>H1, the operating frequency of the first fan is increased, and / or the operating frequency of the second fan is increased, wherein H1 is the set temperature of the air source heat pump.

[0023] The beneficial effects of the present application are as follows: when the IPM temperature of the driver board exceeds the preset temperature threshold, the heat of the driver board is transferred to the heat sink, and the second fan in the heat dissipation channel is started, so that the airflow state in the heat dissipation channel changes, thereby continuously inhaling new air from the compressor cavity. After the air enters the heat dissipation channel through one end of the air duct shell, the air flows along the heat dissipation channel under the drive of the second fan, passes through the heat sink, takes away the heat and outputs it to the fan cavity, and then is discharged from the fan cavity to the outside of the machine body. In this solution, the independent heat dissipation channel formed in the air duct shell can accelerate the heat dissipation of the driver board, and the heat dissipation efficiency is better and faster, thereby significantly improving the capacity and energy efficiency of the heat pump.

[0024] In addition, based on the above-mentioned heat pump, the operating logic of the second fan is optimized. By real-time monitoring of the IPM temperature of the driver board, when the temperature exceeds the threshold, the second fan is started. This allows the heat pump to accurately control the operation of the second fan under different load conditions, ensuring that the IPM temperature of the driver board is within the appropriate range, thereby increasing the operating frequency of the compressor and ensuring the heating effect of the heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described in detail below based on the drawings and embodiments.

[0026] Figure 1 The internal schematic diagram of the air source heat pump described in the embodiment of the present application Figure 1 ;

[0027] Figure 2 The internal schematic diagram of the air source heat pump described in the embodiment of the present application Figure 2 ;

[0028] Figure 3 For the embodiment of this application Figure 2 The enlarged schematic diagram of point A in the middle;

[0029] Figure 4 The internal schematic diagram of the air source heat pump described in the embodiment of the present application Figure 3 (Hide the electrical box).

[0030] In the figure: 1. machine body; 101. compressor cavity; 102. fan cavity; 2. drive plate; 3. heat sink; 4. air duct shell; 5. first fan; 6. second fan; 7. connection port; 8. flow guide; 9. electrical box; 10. middle partition; 11. air inlet. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0032] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] like Figure 1-Figure 4 As shown, this embodiment provides an air source heat pump, including: a body 1, a drive plate 2, a heat sink 3 and an air duct shell 4, the body 1 is provided with a relatively independent compressor chamber 101 and a fan chamber 102, the fan chamber 102 is provided with a first fan 5, the drive plate 2 is installed inside the body 1, the heat sink 3 is arranged on one side of the drive plate 2, the air duct shell 4 is arranged inside the body 1, a heat dissipation channel is formed in the air duct shell 4, the heat sink 3 is located in the heat dissipation channel, one end of the heat dissipation channel is connected to the compressor chamber 101, and the other end is connected to the fan chamber 102, a second fan 6 is arranged in the heat dissipation channel, so that the air in the compressor chamber 101 enters from one end of the heat dissipation channel, passes through the heat sink 3, and is transported to the fan chamber 102 from the other end of the heat dissipation channel.

[0035] Based on the above scheme, when the temperature of the IPM (intelligent power module) on the driver board 2 exceeds the preset safety threshold, a precise heat dissipation process is immediately triggered. The core mechanism of this process is that the heat generated by the driver board 2 is first effectively transferred to the heat sink 3 that fits closely with it. Next, the second fan 6 located inside the carefully designed air duct shell 4 inside the body 1 is activated. An independent heat dissipation channel is constructed inside the air duct shell 4, which plays a vital role as a key path connecting the compressor cavity 101 and the fan cavity 102. When the second fan 6 is started, it significantly adjusts the air flow dynamics in the heat dissipation channel, prompting the fresh air in the compressor cavity 101 to be continuously inhaled. These airs smoothly flow into the heat dissipation channel through one end of the air duct shell 4, and flow in an orderly manner along the channel under the strong drive of the second fan 6. During the flow process, the air is in close contact with the heat sink 3, and efficiently absorbs the heat on the heat sink 3. With the effective transfer of heat, the temperature of the air gradually increases, and then these heat-rich air is transported to the fan cavity 102. In the fan cavity 102, the first fan 5 is responsible for discharging the hot air to the outside of the body 1, thereby achieving the purpose of heat dissipation. At the same time, it can also assist in the output of heating air, thereby successfully completing the entire heat dissipation cycle.

[0036] The heat dissipation channel design in this solution not only significantly speeds up the heat dissipation speed of the driver board 2, but also greatly improves the heat dissipation efficiency. Compared with the traditional heat dissipation method, it can effectively discharge the heat on the driver board 2 in a shorter time, thereby ensuring the stable and efficient operation of the heat pump system.

[0037] In addition, the solution also optimizes the operating logic of the second fan 6. By real-time and accurate monitoring of the temperature of the drive plate 2IPM, the system can intelligently determine when to start the second fan 6. This precise control strategy ensures that under different load conditions, the second fan 6 can maintain the temperature of the drive plate 2IPM within a suitable range in the optimal operating state. This improvement not only significantly improves the operating frequency of the compressor, but also further enhances the heating performance of the heat pump, making the entire system more efficient, stable and reliable.

[0038] Furthermore, the heat dissipation channel has a first end and a second end, the first end is connected to the press chamber 101, the second fan 6 is arranged at the second end, and the first end is also provided with a guide 8 so that the air in the press chamber 101 enters the heat dissipation channel upward. The main function of the guide 8 is that it can guide the air in the press chamber 101 to enter the heat dissipation channel in a specific direction (such as upward). This design not only ensures that the air can flow smoothly into the heat dissipation channel, but also further enhances the heat dissipation effect by changing the direction of air flow.

[0039] It should be noted that in the heating mode, the fan chamber 102 blows hot air, which is not conducive to effective heat dissipation of the heat sink 3, and the air temperature in the compressor chamber 101 is lower than that of the fan chamber 102. Therefore, the cold air in the compressor chamber 101 is introduced into the heat dissipation channel, which can dissipate the heat of the heat sink 3 and finally be discharged from the fan chamber 102.

[0040] Furthermore, a middle partition 10 is provided in the body 1, and the middle partition 10 divides the interior of the body 1 into a compressor chamber 101 and a fan chamber 102. The air duct shell 4 is installed on the middle partition 10 and is located on one side of the fan chamber 102. The body 1 is provided with an air inlet 11, and the air inlet 11 connects the external environment with the compressor chamber 101. The compressor chamber 101 is a relatively closed space, and its internal pressure is different from that of the external environment. A connecting port 7 is provided on the side of the first end of the air duct shell 4 to connect the compressor chamber 101. In order to avoid interference caused by the middle partition 10, the position corresponding to the connecting port 7 on the middle partition 10 is hollowed out, so that the connecting port 7 can smoothly connect the compressor chamber 101 and the heat dissipation channel. When the second fan 6 is started during the heat dissipation process, not only does it generate forced convection in the heat dissipation channel, but also the pressure difference between the connecting port 7 and the air inlet 11 further promotes the natural flow of air. This air flow driven by pressure difference complements the forced convection generated by the second fan 6, and together they form an efficient and stable heat dissipation system.

[0041] Specifically, when the air in the compressor cavity 101 is drawn into the heat dissipation channel by the second fan 6, the pressure at the connection port 7 decreases, while the air inlet 11, as the connection point between the external environment and the compressor cavity 101, has a relatively high pressure. Therefore, under the action of the pressure difference, the fresh air in the external environment is sucked into the compressor cavity 101 through the air inlet 11, and then enters the heat dissipation channel through the connection port 7. In this process, the fresh air not only provides a continuous cold source for the heat dissipation channel, but also takes away the heat on the heat sink 3 through the flow.

[0042] At the same time, the top surface of the second end of the air duct shell 4 is provided with an air outlet connected to the fan cavity 102. Here, the connection port 7 and the air outlet are in different planes. It can be understood that the connection port 7 is facing the horizontal direction, and the air outlet is facing the vertical direction. In addition, the air duct shell 4 is sealed except for the connection port 7, the air outlet and other positions where the heat sink 3 is installed. Since the drive plate 2 is installed in the compressor cavity 101, and the air duct shell 4 is installed in the fan cavity 102, the connection port 7 is provided on the side of the first end to guide the air in the compressor cavity 101 into the heat dissipation channel. The air in the heat dissipation channel is transported upward through the heat sink 3 under the drive of the second fan 6, and then discharged from the top air outlet to the fan cavity 102. This not only achieves effective heat dissipation, but also avoids the air discharged from the heat dissipation channel from disturbing the original air flow in the fan cavity 102.

[0043] In particular, the heat sink 3 includes a plurality of heat sink fins, and gaps for air to flow through are formed between adjacent heat sink fins. It can also be understood that the heat sink fins are vertically arranged in the heat dissipation channel, so that air can pass through the gaps between the heat sink fins and take away heat.

[0044] In addition, the heat sink 3 can be a heat pipe in addition to a fin form, which dissipates heat by absorbing heat in the high temperature part, condensing, releasing heat and circulating again through the liquid inside the pipe. The heat dissipation efficiency is higher than that of a traditional radiator and the volume is smaller. The heat sink 3 can also be a heat sink fin, which is similar to a heat sink, but is usually thinner, denser, and arranged in a fin-like structure. This structure can more effectively increase the heat dissipation area and improve the heat dissipation efficiency.

[0045] It is worth mentioning that during the heat dissipation process, the air flow state of the fan cavity 102 is often laminar, so in the wind field of the first fan 5, the air flow rate around the fan blades is the largest, and the wind speed is smaller the farther away from the fan blades, and the air duct shell 4 and the heat sink 3 are generally far away from the first fan 5 to avoid collision damage. Therefore, the wind speed at the heat sink 3 arranged on the drive plate 2 is almost zero, and the wind field around the heat sink 3 is in a laminar state. The heat dissipated by the heat sink 3 cannot be effectively dissipated, resulting in a very high IPM temperature of the drive plate 2, and the compressor can only operate at a low frequency, resulting in a very low energy efficiency of the heat pump. When the second fan 6 is started, the airflow state of the heat dissipation channel will change. At this time, the state of air flow in the heat dissipation channel is often a transition flow. The transition flow is a flow state between laminar flow and turbulent flow. When the flow rate of the fluid in the heat dissipation channel, the geometric shape of the heat dissipation channel, the physical properties of the fluid and other factors change, the air flow state may change from laminar flow to turbulent flow. This process is often a transition flow. Since orderly flows similar to laminar flows sometimes appear in local areas of the heat dissipation channel, and some small vortices are generated in other areas, presenting an unstable state, it greatly improves the heat dissipation effect of the heat sink 3 and greatly improves the capacity and energy efficiency of the heat pump.

[0046] Generally speaking, an electrical box 9 is also provided in the machine body 1 , and the driving board 2 is installed inside the electrical box 9 .

[0047] As an optional specific real-time solution, the drive plate 2 is arranged in the press cavity 101, and the air duct shell 4 can also be arranged in the press cavity 101. At this time, a connecting port 7 is opened on the bottom or side of the first end of the air duct shell 4, so that the air in the press cavity 101 can smoothly enter the heat dissipation channel, and an air outlet is opened on the side of the second end, and the middle partition plate 10 needs to be hollowed out corresponding to the air outlet position, so that the air in the heat dissipation channel can smoothly enter the fan cavity 102.

[0048] It should be pointed out that in this solution, the guide member 8 can be provided or not provided at the connection port 7 according to the situation, but a guide member must be provided at the air outlet because the air outlet is for horizontal air discharge. If the guide member 8 is not provided, the air in the heat dissipation channel will disturb the airflow in the fan cavity 102.

[0049] As another optional specific real-time solution, when the air duct shell 4 is embedded in the middle partition, half of the air duct shell 4 is located in the compressor cavity 101, and the other half is located in the fan cavity 102. A connecting port 7 is opened on the bottom surface of the first end of the air duct shell 4, and an air outlet is opened on the top surface of the second end. The part of the connecting port 7 located in the fan cavity 102 is sealed, and the part of the air outlet located in the compressor cavity 101 is sealed.

[0050] On the other hand, a control method for an air source heat pump is also provided, which is used in the air source heat pump as described above. The execution of the control method begins with the start-up of the air source heat pump. Once the heat pump starts running, the first fan 5 is immediately turned on to maintain the basic airflow circulation inside the heat pump system. At the same time, the system starts to monitor the temperature T of the intelligent power module (IPM) on the driver board 2 in real time. When the monitored IPM temperature T exceeds the preset temperature threshold T1, the system determines that the heat dissipation effect needs to be enhanced, and then starts the second fan 6. It is worth noting that at the beginning of the start-up of the second fan 6, the system sets its operating frequency at a lower level to avoid excessive interference with the system airflow. In order to achieve coordinated operation between the two fans, the system also designs a frequency adjustment mechanism. Specifically, the system will dynamically adjust the frequency of the second fan 6 according to the real-time operating frequency of the first fan 5. For example, when the first fan 5 runs at a higher frequency, the system will choose to start the second fan 6 at a relatively low but appropriate frequency to ensure that the airflows generated by the two can merge with each other instead of interfering with each other. As the IPM temperature continues to rise, the system will gradually increase the operating frequency of the second fan 6, but in this process it will always be coordinated with the frequency of the first fan 5. Through this fine frequency adjustment, the system can minimize turbulence, thereby ensuring maximum heat dissipation.

[0051] Generally speaking, a compressor is arranged in the compressor chamber 101, and the operating state of the heat pump is divided into at least three operating states, the first being a high-load operating state, the second being a low-load operating state, and the third being a special operating state (such as a fault).

[0052] Based on the high-load operation state described in the first case, that is, when the heat pump is in high-load operation, the IPM temperature of the drive board 2 rises rapidly, and the IPM temperature is monitored in real time by the temperature sensor. Initial stage: only the first fan 5 is started for basic heat dissipation. When the IPM temperature reaches the preset higher threshold T2, the compressor begins to reduce the operating frequency to reduce heat generation. If the IPM temperature continues to rise and exceeds the higher threshold T1, the second fan 6 is started, and the operating frequencies of the two fans are adjusted according to the anti-disturbance control logic described previously to ensure the heat dissipation effect. With the continuous operation of the second fan 6, when the IPM temperature drops to T3, the compressor stops reducing the frequency and maintains the current frequency. When the temperature further drops to T4, the compressor releases the frequency limit and quickly rises to the normal operating frequency. At this time, the entire wind field forms a strong air flow to achieve efficient heat dissipation. Among them, T2, T3 and T4 are all preset temperature thresholds, and T4﹤T3﹤T2﹤T1.

[0053] Based on the second low-load operation state, that is, when the heat pump is in low-load operation, the heat generated by the drive board 2 is relatively small, and the first fan 5 runs at a lower frequency to maintain basic heat dissipation. If the IPM temperature rises slightly but does not reach T1, the second fan 6 is not turned on, and only the first fan 5 and the heat sink 3 are used for natural heat dissipation. If the IPM temperature continues to rise and exceeds T1, it operates according to the control logic of the high-load operation state to ensure that the IPM temperature is stable within a reasonable range, so that the compressor frequency remains stable and the normal operation of the heat pump is guaranteed.

[0054] Based on the third special operating state, after the second fan 6 is turned on, the external environment temperature t is detected in real time, and the IPM temperature T of the drive board 2 is set to drop by F. When the detected environment temperature t>t1 and the heat pump is in high-load operation, the IPM temperature drops slowly but is still higher than the normal range (i.e., T>T1 and F<F1) when the first fan 5 and the second fan 6 are both turned on and operating normally. At this time, the upper limit of the operating frequency of the first fan 5 and the second fan 6 can be appropriately increased to enhance the heat dissipation capacity until the IPM temperature drops to a safe range. Here, the first fan 5 and the second fan 6 can selectively increase the operating frequency of one of them separately, or increase the operating frequency at the same time according to actual conditions. If the heat dissipation is abnormal due to a fault, such as a fault of the second fan 6, the compressor is stopped immediately, and a fault alarm signal is issued. After the second fan 6 is repaired, the system is restarted and operates according to the normal control logic. Among them, t1 is the preset ambient temperature threshold, and F is the preset amplitude threshold.

[0055] It should be noted that when the second fan 6 is turned on, if the system detects that the IPM temperature T of the drive board 2 continues to rise, this usually means that the current heat dissipation capacity is insufficient to meet the heat dissipation requirements of the heat pump system. In order to more effectively reduce the IPM temperature and prevent it from overheating, the system can give priority to gradually increasing the operating frequency of the second fan 6. Increasing the operating frequency of the second fan 6 will increase the air flow in the heat dissipation channel, thereby accelerating the transfer and dissipation of heat. This measure can quickly respond to the rise in IPM temperature without changing the operating frequency of the compressor, which helps to maintain the stable operation of the heat pump system. Among them, the continuous increase means that after the second fan 6 is started, the IPM temperature is still in the rising stage and no cooling occurs.

[0056] Specifically, the second fan 6 includes at least a first operating gear, a second operating gear and a third operating gear. When T﹥T1, the second fan 6 operates according to the first operating gear; when T﹥T5, the second fan 6 operates according to the second operating gear; when T﹥T6, the second fan 6 operates according to the third operating gear; wherein, T6﹥T5﹥T1, the operating frequency of the third operating gear is greater than the operating frequency of the second operating gear, and the operating frequency of the second operating gear is greater than the operating frequency of the first operating gear.

[0057] When the IPM temperature T exceeds the preset threshold value T1, the second fan 6 starts at the first operating gear, which is the initial operating gear of the second fan 6. Its operating frequency is relatively low, but it is sufficient to provide the necessary heat dissipation capacity when the heat pump system is at a lower load or initial warming stage.

[0058] As the IPM temperature rises further, when T exceeds a higher threshold value T5, the system will upgrade the second fan 6 to the second operating gear. In this gear, the operating frequency of the second fan 6 increases, thereby improving the air flow and heat dissipation efficiency in the heat dissipation channel. This measure helps to maintain stable operation of the system when the heat pump system is under high load or the IPM temperature rises rapidly.

[0059] If the IPM temperature continues to rise and exceeds the highest threshold value T6, the second fan 6 will enter the third operating gear. In this gear, the operating frequency of the second fan 6 reaches the highest, providing the strongest heat dissipation capacity. This measure is an emergency heat dissipation measure taken when the heat pump system is under extreme load or the IPM temperature is extremely high to ensure the safe and stable operation of the system.

[0060] However, while increasing the operating frequency of the second fan 6, the system also needs to continue to monitor the change of the IPM temperature and adjust the operating parameters of the first fan 5 and the second fan 6 according to the actual situation. If the rise of the IPM temperature cannot be effectively controlled by simply increasing the frequency of the second fan 6, the system may need to take further measures, such as reducing the operating frequency of the compressor or starting other backup heat dissipation mechanisms.

[0061] In addition, in order to avoid excessive increase in energy consumption and noise, the system also needs to consider its upper limit when increasing the operating frequency of the second fan 6. When the operating frequency of the second fan 6 reaches the preset maximum value, if the IPM temperature continues to rise, the system may need to take more urgent cooling measures or issue a fault alarm.

[0062] In some embodiments, when the air source heat pump is running in heating mode, the outlet temperature H of the first fan 5 is detected in real time. When H>H1, the operating frequency of the first fan 5 is increased, and / or the operating frequency of the second fan 6 is increased, wherein H1 is the temperature set by the air source heat pump. Under heating conditions, the outlet side of the first fan 5 is temperature detected. When it is detected that the air temperature of this part is high, it means that a lot of heat is not fully utilized. At this time, according to the use requirements, when rapid temperature rise is required, the control system can adjust the fan operation strategy, and convert the energy consumption part originally used for frequency conversion regulation into increasing the fan speed, so that this part of hot air can better participate in the heating cycle of the heat pump, improve energy utilization, and achieve energy saving effect. For example, when it is detected that the vortex (i.e., the outlet side of the first fan 5) brings the air temperature higher than the set temperature H1, the speed of the first fan 5 or the second fan 6 is appropriately increased, so that more heat is sent to the indoor side, reducing the additional heating energy consumption, and improving the overall energy efficiency of the heat pump system under heating conditions.

[0063] In addition, this solution mainly adopts air cooling for heat dissipation. Unlike the fluorine cooling heat dissipation method, the air cooling process will not cause the water vapor in the air to condense into water droplets on the surface of the low-temperature components. Because during the operation of the fluorine cold plate, if the refrigerant temperature is low, when it comes into contact with the outside air, it is easy for the water vapor in the air to cool to the dew point temperature and condense. The air-cooled heat dissipation structure of this solution relies on the flow of air to carry away heat, and the air temperature is relatively stable. There will be no local low temperature causing water vapor condensation, thereby effectively avoiding the risk of condensation on the fluorine cold plate. This not only protects the drive board 2 and related components from damage such as short circuits and corrosion that may be caused by condensation, but also ensures the stable operation of the system, reduces equipment failures and maintenance costs caused by condensation problems, and extends the service life of the equipment.

[0064] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of this application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0065] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0066] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0067] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the present application without creative work, and these methods will fall within the scope of protection of the present application.

Claims

1. An air source heat pump, characterized in that: include: A machine body (1), a drive plate (2), a heat sink (3) and an air duct shell (4); the machine body (1) is provided with a relatively independent compressor chamber (101) and a fan chamber (102); a first fan (5) is provided in the fan chamber (102); the drive plate (2) is mounted inside the machine body (1); the heat sink (3) is provided on one side of the drive plate (2); the air duct shell (4) is provided inside the machine body (1); a heat dissipation channel is formed in the air duct shell (4); the heat sink (3) is located in the heat dissipation channel; one end of the heat dissipation channel is connected to the compressor chamber (101), and the other end is connected to the fan chamber (102); a second fan (6) is provided in the heat dissipation channel, so that air in the compressor chamber (101) enters from one end of the heat dissipation channel, passes through the heat sink (3), and is transported to the fan chamber (102) from the other end of the heat dissipation channel.

2. The air source heat pump according to claim 1, characterized in that: The machine body (1) is provided with an air inlet (11), and the air inlet (11) connects the external environment with the press chamber (101).

3. The air source heat pump according to claim 1, characterized in that: The heat dissipation channel has a first end and a second end, the first end is connected to the compressor cavity (101), the second fan (6) is arranged at the second end, and the first end is also provided with a guide member (8) so that the air in the compressor cavity (101) enters the heat dissipation channel upward.

4. The air source heat pump according to claim 3, characterized in that: A connecting port (7) connected to the compressor cavity (101) is provided on the side surface of the first end, and an air outlet connected to the fan cavity (102) is provided on the top surface of the second end.

5. The air source heat pump according to claim 4, characterized in that: The connection port (7) is located below the heat sink (3).

6. The air source heat pump according to claim 1, characterized in that: The driving plate (2) is installed in the compressor cavity (101), and the air duct housing (4) is arranged in the fan cavity (102).

7. A control method for an air source heat pump, characterized in that: Used in the air source heat pump as described in any one of claims 1 to 6, the control method comprises: after the air source heat pump is running, the first fan (5) is turned on, and the IPM temperature T of the drive plate (2) is monitored in real time, and when T>T1, the second fan (6) is turned on, wherein T1 is a preset temperature threshold.

8. The control method of the air source heat pump according to claim 7, characterized in that: A compressor is arranged in the compressor chamber (101), and when T2≤T≤T1, the compressor reduces its operating frequency, wherein T2 is a preset temperature threshold.

9. The control method of the air source heat pump according to claim 8, characterized in that: When T≤T3, the compressor stops reducing the frequency and keeps running at the current frequency, wherein T3 is a preset temperature threshold and T3﹤T2.

10. The control method of the air source heat pump according to claim 9, characterized in that: When T≤T4, the compressor releases the frequency restriction and increases the operating frequency, wherein T4 is a preset temperature threshold and T4﹤T3.

11. The control method of the air source heat pump according to claim 7, characterized in that: After the second fan (6) is turned on, when it is detected that the IPM temperature T of the drive plate (2) continues to rise, the operating frequency of the second fan (6) is gradually increased.

12. The control method of the air source heat pump according to claim 11, characterized in that: The second fan (6) includes at least a first operating gear, a second operating gear and a third operating gear. When T>T1, the second fan (6) operates according to the first operating gear; when T>T5, the second fan (6) operates according to the second operating gear; when T>T6, the second fan (6) operates according to the third operating gear; wherein T6>T5>T1, the operating frequency of the third operating gear is greater than the operating frequency of the second operating gear, and the operating frequency of the second operating gear is greater than the operating frequency of the first operating gear.

13. The control method of the air source heat pump according to claim 7, characterized in that: After the second fan (6) is turned on, the external environment temperature t is detected in real time, and the IPM temperature T of the drive plate (2) is set to decrease by F. When t>t1, T>T1 and F<F1, the operating frequency of the first fan (5) is increased, and / or the operating frequency of the second fan (6) is increased, wherein t1 is a preset ambient temperature threshold and F is a preset amplitude threshold.

14. The control method of the air source heat pump according to claim 7, characterized in that: When the air source heat pump operates in a heating mode, the outlet temperature H of the first fan (5) is detected in real time. When H>H1, the operating frequency of the first fan (5) is increased, and / or the operating frequency of the second fan (6) is increased, wherein H1 is the set temperature of the air source heat pump.

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