Waste heat recovery system

Abstract

The utility model discloses a waste heat recovery system, which is applied to a heating component and comprises at least one heat utilization device, a heat source heat exchanger, a circulating pump, a main pipeline and at least one sub heat exchanger. A first fluid channel is arranged in the heat source heat exchanger, the first fluid channel is used for circulation of a heat transfer medium, the heat source heat exchanger is arranged at the heating component, and the heat transfer medium in the first fluid channel absorbs heat energy of the heating component; the inlet end of the circulating pump is connected with the outlet end of the first fluid channel; the inlet end of the main pipeline is connected with the outlet end of the circulating pump; the sub heat exchanger is arranged on the heat utilization equipment, a second fluid channel is arranged in the sub heat exchanger, the inlet end of the second fluid channel is connected with the outlet end of the main pipeline, the outlet end of the second fluid channel is connected with the inlet end of the first fluid channel, and the heat transfer medium flows into the second fluid channel and supplies heat to the heat utilization equipment. According to the utility model, the heat dissipation of the heating component is realized, and meanwhile, the waste heat can be effectively utilized.

Description

Technical Field

[0001] This utility model relates to the field of energy recovery technology, and in particular to a waste heat recovery system. Background Technology

[0002] An inverter is a power electronic device that converts direct current (DC) to alternating current (AC). It acts as a bridge between DC power sources (such as batteries and solar panels) and AC loads (such as household appliances and industrial motors). With the development of energy storage and conversion technologies, inverters are increasingly widely used in power systems. However, inverters generate a significant amount of heat during operation due to power losses. Traditional methods often involve using heat sinks, fans, and other cooling devices to dissipate this heat into the surrounding environment, resulting in energy waste. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a waste heat recovery system.

[0004] The solution to the technical problem of this utility model is:

[0005] A waste heat recovery system is proposed for use in heating components, the waste heat recovery system comprising:

[0006] At least one heat-consuming device;

[0007] A heat source heat exchanger has a first fluid channel for supplying heat transfer medium. The heat source heat exchanger is located at the heating element. The heat transfer medium in the first fluid channel absorbs the heat energy of the heating element.

[0008] A circulating pump, the inlet end of which is connected to the outlet end of the first fluid channel;

[0009] The main pipeline, the inlet end of which is connected to the outlet end of the circulating pump;

[0010] At least one sub-heat exchanger is provided on the heat-using equipment. The sub-heat exchanger has a second fluid channel inside it. The inlet end of the second fluid channel is connected to the outlet end of the main pipeline, and the outlet end of the second fluid channel is connected to the inlet end of the first fluid channel. The heat transfer medium flows into the second fluid channel and supplies heat to the heat-using equipment.

[0011] This invention has at least the following beneficial effects: the heat transfer medium located in the first fluid channel can absorb heat energy from the heating component, and the circulation pump can provide the flow power for the heat transfer medium, so that the heat transfer medium flows from the first fluid channel to the main pipe. After passing through the main pipe, the heat transfer medium flows to the second fluid channel, and the heat transfer medium in the second fluid channel supplies heat to the heat-using equipment. While realizing heat dissipation of the heating component, the heat that was originally wasted is effectively utilized, improving the overall utilization rate of the entire energy system, reducing the dependence of the heat-using equipment on additional energy (such as electric heating, gas heating, etc.), and reducing energy consumption costs.

[0012] As a further improvement to the above technical solution, the first fluid channel is provided with at least one bend, and adjacent bends are interconnected.

[0013] As a further improvement to the above technical solution, the heat-using equipment includes one or more of the following: a warm air blower, a heating circulating water pipe, and a water heater.

[0014] As a further improvement to the above technical solution, the heat-using equipment includes a warm air fan, the sub-heat exchanger is provided with a heat-conducting cavity, the heat-conducting cavity is provided with an air inlet and an air outlet, the air outlet is arranged facing the air inlet side of the warm air fan, the heat-conducting cavity is provided with a plurality of staggered fins, the fins are arranged between the air inlet and the air outlet, and the second fluid channel is thermally connected to the fins.

[0015] As a further improvement to the above technical solution, the waste heat recovery system also includes an air filter, which is located at the air inlet of the sub-heat exchanger.

[0016] As a further improvement to the above technical solution, the heat-using equipment includes a heating circulating water pipe, and the sub-heat exchanger corresponding to the heating circulating water pipe has a shell. The second fluid channel is located inside the shell and is in thermal contact with the shell. The heating circulating water pipe is in thermal contact with the shell.

[0017] As a further improvement to the above technical solution, the heat-using equipment includes a water heater, which includes a heat exchange tube and a water storage tank. The sub-heat exchanger corresponding to the water heater is provided with a heat-conducting plate. The second fluid channel and the heat exchange tube are respectively located on both sides of the heat-conducting plate and are in thermal contact with the heat-conducting plate. The outlet and inlet of the heat exchange tube are respectively connected to the water storage tank.

[0018] As a further improvement to the above technical solution, the waste heat recovery system further includes at least one reversing valve and at least one bypass pipe. The reversing valve is configured one-to-one with the second fluid channel of the sub-heat exchanger, and the sub-heat exchanger is configured one-to-one with the bypass pipe. Each reversing valve has one inlet end and two outlet ends. The inlet end of the reversing valve is connected to one of the outlet ends. The inlet end of each reversing valve is connected to the outlet end of the main pipe. The two outlet ends of the reversing valve are respectively connected to the inlet end of the corresponding second fluid channel and the inlet end of the corresponding bypass pipe. The outlet ends of the bypass pipe are all connected to the inlet end of the first fluid channel.

[0019] As a further improvement to the above technical solution, the waste heat recovery system also includes a controller and an operating component. The operating component is communicatively connected to the controller and is used to send user commands to the controller. The controller is electrically connected to the reversing valve and is configured to control the conduction path of the reversing valve according to the user commands.

[0020] As a further improvement to the above technical solution, the waste heat recovery system also includes a pressure sensor, which is used to obtain the pressure value in the second fluid channel. The pressure sensor and the circulation pump are electrically connected to the controller. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the waste heat recovery system according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the waste heat recovery system according to another embodiment of the present invention;

[0024] Figure 3 This is a detailed structural diagram of the waste heat recovery system according to an embodiment of the present invention.

[0025] Reference numerals: 100, heating element; 200, heat source heat exchanger; 210, first fluid channel; 300, circulating pump; 400, main pipe; 500, first sub-heat exchanger; 510, warm air fan; 520, air filter; 530, first reversing valve; 540, first bypass pipe; 600, second sub-heat exchanger; 610, heating circulating water pipe; 620, second reversing valve; 630, second bypass pipe; 640, second fluid channel; 700, third sub-heat exchanger; 710, water storage tank; 720, third reversing valve; 730, third bypass pipe. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. The various technical features of this utility model can be combined interactively without contradicting each other.

[0031] Reference Figure 1This utility model embodiment proposes a waste heat recovery system for recovering heat from a heating element 100 and transferring it to a heat-using device for utilization. It includes at least one heat-using device, a heat source heat exchanger 200, a circulating pump 300, a main pipeline 400, and sub-heat exchangers. One or more sub-heat exchangers are provided. The heat source heat exchanger 200 is located at the heating element 100, while the sub-heat exchangers are located at the heat-using device. When multiple sub-heat exchangers are provided, multiple heat-using devices can be heated.

[0032] In this embodiment, refer to Figure 3 The heat source heat exchanger 200 has a first fluid channel 210 inside, which is used for the flow of heat transfer medium. It is understood that the heat transfer medium can be water, oil, molten salt, liquid metal, etc., and is not specifically limited here. Figure 1 The middle arrow indicates the direction of heat transfer medium flow.

[0033] The inlet end of the circulating pump 300 is connected to the outlet end of the first fluid channel 210, while the outlet end of the circulating pump 300 is connected to the inlet end of the main pipeline 400. The arrangement of the circulating pump 300 ensures the flow direction of the heat transfer medium and provides the driving force for the flow of the heat transfer medium.

[0034] The sub-heat exchanger has a second fluid channel 640 inside. The inlet end of the second fluid channel 640 is connected to the outlet end of the main pipe 400, and the outlet end of the second fluid channel 640 is connected to the inlet end of the first fluid channel 210. Under the action of the circulating pump 300, the heat transfer medium can flow from the first fluid channel 210 to the main pipe 400, then to the second fluid channel 640, and finally flow back to the first fluid channel 210, realizing the circulation of the heat transfer medium.

[0035] Understandably, when the heat transfer medium is in the first fluid channel 210, the waste heat of the heating element 100 can be transferred to the heat transfer medium in the first fluid channel 210, causing the temperature of the heat transfer medium to rise and realizing the recovery of heat from the heating element 100. When the heat transfer medium flows into the second fluid channel 640, the heat transfer medium in the second fluid channel 640 can exchange heat with the heat-using equipment, thereby reusing the waste heat recovered from the heating element 100.

[0036] By applying the waste heat recovery system of this embodiment to an inverter, heat can be recovered from the heat-generating components 100 of the inverter, thus achieving the effect of inverter heat dissipation and reducing energy waste. It is understood that the main heat-generating components 100 of the inverter include, but are not limited to, power transistors and inductors.

[0037] In this embodiment, the heat source heat exchanger 200 is made of a metal material with high thermal conductivity, such as copper, silver, aluminum, magnesium and nickel-based alloys. The heat source heat exchanger 200 is tightly wrapped or attached to the main heat-generating components 100 of the inverter, such as power transistors and inductors, to ensure efficient heat absorption.

[0038] It is understood that the first fluid channel 210 is provided with at least one bend, and adjacent bends are interconnected. The first fluid channel 210 can be a serpentine fluid channel, a spiral fluid channel, a U-shaped fluid channel, a parallel fluid channel, or other similar shapes. Using a serpentine fluid channel as the first fluid channel 210 allows the heat transfer medium to have a longer flow path within the heat source heat exchanger 200, increasing the contact time between the heat transfer medium and the inner wall of the heat source heat exchanger 200, resulting in more complete heat transfer and improved heat exchange efficiency.

[0039] The circulating pump can be a centrifugal pump, gear pump, screw pump, plunger pump, or other types of pumps. This embodiment uses a centrifugal pump as an example for explanation. In this embodiment, the circulating pump 300 is a high-temperature and corrosion-resistant centrifugal pump, which relies on the centrifugal force generated by the rotation of its internal impeller to transport the heat transfer medium. The centrifugal pump is connected to the outlet end of the first fluid channel 210, providing power for the circulation of the heat transfer medium and ensuring that heat can be stably transferred from the heat source heat exchanger 200 to the subsequent sub-heat exchanger.

[0040] In some embodiments, the heating device includes one or more of a warm air blower 510, a heating circulating water pipe 610, and a water heater. The heating device may be a plurality of warm air blowers 510, a plurality of heating circulating water pipes 610, or a plurality of water heaters, or it may be a combination of two or three of the warm air blowers 510, heating circulating water pipes 610, and water heaters.

[0041] Understandably, the heater fan 510 blows out warm air, and its corresponding sub-heat exchanger is located on the air inlet side of the heater fan 510. This sub-heat exchanger can exchange heat with the air entering the heater fan 510, thereby raising the temperature of the air entering the heater fan 510 and causing the heater fan 510 to blow out warm air. For ease of description, the sub-heat exchanger corresponding to the heater fan 510 will be referred to as the first sub-heat exchanger 500 below.

[0042] It is understood that the first sub-heat exchanger 500 can be a finned heat exchanger, a shell-and-tube heat exchanger, a plate heat exchanger, a coaxial heat exchanger, etc. In some embodiments, the first sub-heat exchanger 500 is a finned heat exchanger. The first sub-heat exchanger 500 is provided with a heat conduction cavity, which has an air inlet and an air outlet. Air can enter the heat conduction cavity from the air inlet and flow out from the air outlet, which is located towards the air inlet side of the warm air blower 510. Multiple fins are provided in the heat conduction cavity, which are arranged in an alternating pattern and positioned between the air inlet and the air outlet. The air entering the heat conduction cavity needs to pass through the fins before flowing out from the air outlet. The second fluid channel 640 of the first sub-heat exchanger 500 is thermally connected to the fins and can perform heat exchange for the fins, so that the heat transfer medium in the second fluid channel 640 transfers heat to the fins, the fin temperature rises, and thus the air in contact with the fins is heated.

[0043] The fins can be thin sheets arranged in a staggered pattern to ensure that air can fully contact the high-temperature surface as it flows through them, thus improving heat exchange efficiency. Understandably, the staggered arrangement of the fins increases the heat exchange area between the air and the heat transfer medium, thereby improving heat exchange efficiency. When air flows from one side of the fins to the side closest to the heater 510, it gains more heat energy. The heated air then enters the heater 510 and is blown out, providing warm air to the space.

[0044] In some embodiments, the waste heat recovery system further includes an air filter 520, which is installed at the air inlet of the first sub-heat exchanger 500. The air filter 520 can filter the air entering the first sub-heat exchanger 500, remove dust, impurities and other contaminants from the air, thereby improving the quality of the warm air blown out by the warm air blower 510 and preventing dust, impurities and other contaminants from entering the interior of the first sub-heat exchanger 500 and affecting the heat exchange efficiency and service life.

[0045] Understandably, the heating circulating water pipe 610 is used in the building's heating system to provide heat energy for the building's heating system. For ease of description, the sub-heat exchanger corresponding to the heating circulating water pipe 610 will be referred to as the second sub-heat exchanger 600. The second sub-heat exchanger 600 can transfer waste heat to the circulating water in the heating circulating water pipe 610.

[0046] In some embodiments, the second sub-heat exchanger 600 is a shell-and-tube heat exchanger. The internal second fluid channel 640 is a copper tube. The second sub-heat exchanger 600 has a shell made of carbon steel or other materials with good thermal conductivity. The second fluid channel 640 is located inside the shell and is in thermal contact with it. The heating circulating water pipe 610 is also in thermal contact with the shell. After the second fluid channel 640 of the second sub-heat exchanger 600 transfers heat energy to the shell, the heat energy is then transferred through the shell to the circulating water in the heating circulating water pipe 610, thereby achieving the effect of utilizing waste heat in the heating system.

[0047] In some embodiments, the second fluid channels 640 inside the second sub-heat exchanger 600 are arranged in a spiral shape.

[0048] Understandably, this design increases the contact area between the fluid and the second fluid channel 640, allowing heat to be transferred from the heat transfer medium inside the second fluid channel 640 to the fluid outside the second fluid channel 640 over a larger surface area. Furthermore, because the second fluid channel 640 is a spiral pipe rather than a straight pipe, the fluid residence time is relatively longer, which also improves the heat exchange effect.

[0049] Secondly, the spirally arranged second fluid channels 640 can also enhance the turbulence of the heat transfer medium. When the fluid flows in the spirally arranged second fluid channels 640, due to the centrifugal force, strong mixing occurs between the fluid near the wall of the second fluid channel 640 and the central fluid, which enhances the turbulence of the fluid and allows heat to be transferred more quickly throughout the fluid.

[0050] In addition, the spirally arranged second fluid channels 640 can optimize temperature distribution. Due to the spiral shape of the second fluid channels 640, the temperature change is more uniform throughout the entire second sub-heat exchanger 600, avoiding local overheating or undercooling and improving the overall heat exchange efficiency.

[0051] As is understood, a water heater provides hot water to users. It includes heat exchange pipes and a storage tank 710. The inlet and outlet of the heat exchange pipes are connected to the storage tank 710. The heat exchange pipes can enter a corresponding sub-heat exchanger for heat exchange, raising the temperature of the water within the heat exchange pipes. The heated water then flows back into the storage tank 710, thus heating the water in the storage tank 710, providing hot water for the user. For ease of description, the sub-heat exchanger corresponding to the water heater will be referred to as the third sub-heat exchanger 700. The third sub-heat exchanger 700 can transfer waste heat to the water within the heat exchange pipes.

[0052] In some embodiments, the third sub-heat exchanger 700 is a plate heat exchanger. The interior of the third sub-heat exchanger 700 is provided with heat-conducting plates. The second fluid channel 640 and the heat exchange tubes in the third sub-heat exchanger 700 are respectively disposed on both sides of the heat-conducting plates and are in thermal contact with the heat-conducting plates. The heat transfer medium and the water in the water storage tank 710 flow in adjacent channels, and heat is transferred through the heat-conducting plates. Specifically, the heat transfer medium transfers waste heat to the heat-conducting plates through the second fluid channel 640, and the heat-conducting plates then transfer the heat energy to the water in the heat exchange tubes, thereby achieving the effect of heating the water.

[0053] Understandably, the heat exchange tubes entering the third sub-heat exchanger 700 are arranged along the heat-conducting plates to increase the heat exchange area between them; similarly, the second fluid channel 640 in the third sub-heat exchanger 700 is also arranged along the heat-conducting plates to increase the heat exchange area between the second fluid channel 640 and the heat-conducting plates. In some embodiments, the heat-conducting plates are formed by pressing multiple stainless steel plates together, and the heat-conducting plates have a special corrugated shape to enhance the heat transfer effect.

[0054] In this embodiment, three heat-using devices are provided, and correspondingly, three sub-heat exchangers are also provided. The three heat-using devices are a warm air fan 510, a heating circulating water pipe 610, and a water heater. The three sub-heat exchangers respectively supply heat to the warm air fan 510, the heating circulating water pipe 610, and the water heater, realizing the functions of warm air, heating, and hot water. The different layouts of the sub-heat exchangers can ensure that heat can be effectively transferred from the heat transfer medium in different application scenarios, realizing diversified waste heat utilization functions.

[0055] Reference Figure 2 and Figure 3 Based on the above embodiments, in some embodiments, the waste heat recovery system further includes a reversing valve and a bypass pipe. At least one reversing valve and at least one bypass pipe are provided. The number of reversing valves corresponds one-to-one with the sub-heat exchangers. The inlet end of each reversing valve is connected to the outlet end of the main pipe 400, and the two outlet ends of the reversing valve are connected to the inlet end of the second fluid channel 640 of the corresponding sub-heat exchanger and the inlet end of the bypass pipe, respectively.

[0056] In this embodiment, three directional valves are provided, which are respectively connected to the second fluid channel 640 of the first sub-heat exchanger 500, the second fluid channel 640 of the second sub-heat exchanger 600, and the second fluid channel 640 of the third sub-heat exchanger 700. Three bypass pipes are provided, which are corresponding to the sub-heat exchangers and the heat-using equipment. Each directional valve is connected to the corresponding bypass pipe, and the outlet end of each of the three bypass pipes is connected to the inlet end of the first fluid channel 210.

[0057] For ease of description, the following designation is as follows: the reversing valve corresponding to the heater fan 510 is designated as the first reversing valve 530; the bypass pipe corresponding to the heater fan 510 is designated as the first bypass pipe 540; the reversing valve corresponding to the heating circulating water pipe 610 is designated as the second reversing valve 620; the bypass pipe corresponding to the heating circulating water pipe 610 is designated as the second bypass pipe 630; the reversing valve corresponding to the water heater is designated as the third reversing valve 720; and the bypass pipe corresponding to the water heater is designated as the third bypass pipe 730.

[0058] Figure 2 The direction of the middle arrow indicates the flow direction of the heat transfer medium; Figure 3 The solid arrow indicates the direction of heat transfer medium flow, while the dashed arrow indicates the direction of air flow.

[0059] The two outlets of the first reversing valve 530 are respectively connected to the second fluid channel 640 and the first bypass pipe 540 of the first sub-heat exchanger 500. The two outlets of the second reversing valve 620 are respectively connected to the second fluid channel 640 and the second bypass pipe 630 of the second sub-heat exchanger 600. The two outlets of the third reversing valve 720 are respectively connected to the second fluid channel 640 and the third bypass pipe 730 of the third sub-heat exchanger 700.

[0060] When the heating function is needed, the heater fan 510 is turned on, and the path of the second fluid channel 640 connecting the main pipe 400 and the first sub-heat exchanger 500 in the first reversing valve 530 is opened. The heat transfer medium flows from the main pipe 400 to the second fluid channel 640 of the first sub-heat exchanger 500 and exchanges heat with the air, causing the heater fan 510 to blow out warm air. When the heating function is not needed, the heater fan 510 is turned off, and the path of the first reversing valve 530 connecting the main pipe 400 and the first bypass pipe 540 is opened. The heat transfer medium flows from the main pipe 400 to the first bypass pipe 540 and then back to the first fluid channel 210, without entering the first sub-heat exchanger 500.

[0061] When heating is needed, the path in the second reversing valve 620 connecting the main pipe 400 and the second sub-heat exchanger 600 is opened. The heat transfer medium flows from the main pipe 400 to the second fluid channel 640 of the second sub-heat exchanger 600, exchanging heat with the circulating water in the heating circulating water pipe 610. The temperature of the circulating water in the heating circulating water pipe 610 increases, while the temperature of the heat transfer medium in the second fluid channel 640 decreases, effectively utilizing waste heat and dissipating heat from the heating element 100. When heating is not needed, the path in the second reversing valve 620 connecting the main pipe 400 and the second bypass pipe 630 is opened. The heat transfer medium flows from the main pipe 400 to the second bypass pipe 630 and then back to the first fluid channel 210, without entering the second sub-heat exchanger 600.

[0062] When hot water is needed, the path of the second fluid channel 640 in the third reversing valve 720 connecting the main pipe 400 and the third sub-heat exchanger 700 is opened. The heat transfer medium flows from the main pipe 400 to the second fluid channel 640 of the third sub-heat exchanger 700, exchanging heat with the water in the heat exchange tube. The water temperature in the heat exchange tube rises and flows back to the water storage tank 710, while the temperature of the heat transfer medium in the second fluid channel 640 decreases. This effectively utilizes waste heat and heats the heating element 100. When hot water heating is not needed, the path of the third reversing valve 720 connecting the main pipe 400 and the third bypass pipe 730 is opened. The heat transfer medium flows from the main pipe 400 to the third bypass pipe 730 and then back to the first fluid channel 210, without entering the third sub-heat exchanger 700.

[0063] Based on the above embodiments, in some embodiments, the waste heat recovery system further includes a controller and an operating component. The operating component is communicatively connected to the controller, and the controller is electrically connected to a reversing valve. The reversing valve is a solenoid valve, capable of controlling the flow path through the controller. The operating component can send user commands to the controller, and the controller controls the flow path of the reversing valve according to the user commands. When the heat-consuming equipment is in use, the controller controls the reversing valve to connect the main pipeline 400 and the second fluid channel 640; when the heat-consuming equipment is not in use, the controller controls the reversing valve to connect the main pipeline 400 and the bypass pipeline.

[0064] The controller can be a microcontroller, PLC, etc., capable of performing simple control of the directional valve switching function. The operating unit has a user interface, allowing users to select desired functions such as hot water, warm air, or heating. User commands are transmitted to the controller via the operating unit, which then controls the switching of each directional valve. In this embodiment, a programmable logic controller (PLC) is used. The controller enables the directional valves to switch the path of the heat transfer medium, and the operating unit facilitates user operation.

[0065] It is understood that the connection between the operating components and the controller can be a wired connection or a wireless remote connection, and no specific limitation is made here.

[0066] In some embodiments, the controller is also electrically connected to the circulating pump 300, and the controller can control the start / stop or speed of the circulating pump 300 as needed. For example, when the inverter is not working, the heat-generating components 100 of the inverter do not need heat dissipation, and the controller can control the circulating pump 300 to stop, reducing energy waste.

[0067] In some embodiments, the waste heat recovery system further includes a temperature sensor for detecting the water temperature in the heat exchange tubes of the water heater or in the storage tank 710, and for transmitting the water temperature information to a controller. The controller intelligently controls the operating status of the third reversing valve 720 and the circulation pump 300 based on the acquired water temperature information. For example, when the water temperature reaches a preset value, the controller can stop the circulation pump 300 from operating.

[0068] In some embodiments, the waste heat recovery system further includes a pressure sensor for detecting the pressure in the second fluid channel 640 of the sub-heat exchanger. The pressure sensor is electrically connected to the controller and can transmit the acquired pressure information to the controller. When the pressure is abnormal, the controller can take corresponding protective measures, such as issuing an alarm signal or adjusting the circulation pump 300 to stop working.

[0069] The waste heat recovery system proposed in this embodiment can flexibly convert inverter waste heat into warm air, heating and hot water, so that the originally wasted heat can be effectively utilized, improving the overall utilization rate of the entire energy system, reducing the dependence of heating equipment on additional energy (such as electric heating, gas heating, etc.), and reducing energy consumption costs.

[0070] Through efficient heat exchange structure and intelligent flow distribution control, the usable energy in the inverter's waste heat is extracted to the maximum extent. In different seasons and usage scenarios, waste heat can be flexibly converted into valuable thermal energy, achieving maximum energy recovery and utilization.

[0071] In addition, the controller can flexibly control the path switching of each reversing valve according to changes in user needs, realizing rapid switching between different functions and meeting users' different needs for warm air, heating, and hot water. When all three functions are turned off, the heat transfer medium flows back to the heat exchanger inlet through each bypass pipe, preventing blockage.

[0072] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A waste heat recovery system, characterized in that, The waste heat recovery system, applied to heating components, includes: At least one heat-consuming device; A heat source heat exchanger has a first fluid channel for supplying heat transfer medium. The heat source heat exchanger is located at the heating element. The heat transfer medium in the first fluid channel absorbs the heat energy of the heating element. A circulating pump, the inlet end of which is connected to the outlet end of the first fluid channel; The main pipeline, the inlet end of which is connected to the outlet end of the circulating pump; At least one sub-heat exchanger is provided on the heat-using equipment. The sub-heat exchanger has a second fluid channel inside it. The inlet end of the second fluid channel is connected to the outlet end of the main pipeline, and the outlet end of the second fluid channel is connected to the inlet end of the first fluid channel. The heat transfer medium flows into the second fluid channel and supplies heat to the heat-using equipment.

2. The waste heat recovery system according to claim 1, characterized in that, The first fluid channel has at least one bend, and adjacent bends are interconnected.

3. The waste heat recovery system according to claim 1, characterized in that, The heat-using equipment includes one or more of the following: a heater fan, a heating circulating water pipe, and a water heater.

4. The waste heat recovery system according to claim 3, characterized in that, The heat-using equipment includes a warm air blower. The sub-heat exchanger is provided with a heat-conducting cavity, which has an air inlet and an air outlet. The air outlet is arranged facing the air inlet side of the warm air blower. The heat-conducting cavity is provided with a plurality of staggered fins, which are located between the air inlet and the air outlet. The second fluid channel is thermally connected to the fins.

5. The waste heat recovery system according to claim 4, characterized in that, The waste heat recovery system also includes an air filter, which is located at the air inlet of the sub-heat exchanger.

6. The waste heat recovery system according to claim 3, characterized in that, The heat-using equipment includes a heating circulating water pipe, and the sub-heat exchanger corresponding to the heating circulating water pipe has a shell. The second fluid channel is located inside the shell and is in thermal contact with the shell. The heating circulating water pipe is in thermal contact with the shell.

7. The waste heat recovery system according to claim 3, characterized in that, The heat-using equipment includes a water heater, which includes a heat exchange tube and a water storage tank. The sub-heat exchanger corresponding to the water heater is provided with a heat-conducting plate. The second fluid channel and the heat exchange tube are respectively located on both sides of the heat-conducting plate and are in thermal contact with the heat-conducting plate. The outlet and inlet of the heat exchange tube are respectively connected to the water storage tank.

8. The waste heat recovery system according to claim 1, characterized in that, The waste heat recovery system further includes at least one reversing valve and at least one bypass pipe. The reversing valve is configured one-to-one with the second fluid channel of the sub-heat exchanger, and the sub-heat exchanger is configured one-to-one with the bypass pipe. Each reversing valve has one inlet end and two outlet ends. The inlet end of the reversing valve is connected to one of the outlet ends. The inlet end of each reversing valve is connected to the outlet end of the main pipe. The two outlet ends of the reversing valve are respectively connected to the inlet end of the corresponding second fluid channel and the inlet end of the corresponding bypass pipe. The outlet ends of the bypass pipe are all connected to the inlet end of the first fluid channel.

9. The waste heat recovery system according to claim 8, characterized in that, The waste heat recovery system further includes a controller and an operating component. The operating component is communicatively connected to the controller and is used to send user commands to the controller. The controller is electrically connected to the reversing valve and is configured to control the conduction path of the reversing valve according to the user commands.

10. The waste heat recovery system according to claim 9, characterized in that, The waste heat recovery system also includes a pressure sensor, which is used to obtain the pressure value in the second fluid channel. The pressure sensor and the circulation pump are electrically connected to the controller.

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