Energy-saving heating ventilation air conditioner waste heat recovery device

Abstract

The application provides an energy-saving heating ventilation air conditioner waste heat recovery device, relates to the technical field of waste heat recovery, and comprises an air conditioner shell, a main radiator, two symmetrically distributed auxiliary radiators, a shaft flow air duct and a longitudinally arranged pipe section. The main radiator and the two auxiliary radiators are respectively embedded on three side walls of the air conditioner shell. The inner periphery of the shaft flow air duct and the longitudinally arranged pipe section is provided with a plurality of protruding tracks, and the tail end of each protruding track is provided with a baffle. A plurality of sliding grooves are formed in the outer periphery of the retaining ring, and the sliding grooves are in sliding fit with the protruding tracks. A jacking bolt is screwed through the baffle, and the head end of the jacking bolt is in abutting contact with the top pressing of the transmission shaft. The air flow suction channel for waste heat utilization and the blowing channel for heating air flow are integrated together through reasonable optimization and improvement of the air duct, and the two channels are connected through the shaft flow air duct and the heating ventilator. Therefore, the air flow suction operation for waste heat utilization and the blowing operation for heating air flow can share one heating ventilator, and the number of ventilators can be reduced.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and in particular to an energy-saving HVAC waste heat recovery device. Background Technology

[0002] In commercial buildings, large public buildings, residential buildings, and factories, the long-term continuous operation of air conditioning generates a large amount of waste heat that is not effectively utilized, resulting in serious energy waste. At the same time, it exacerbates the building's electricity load and carbon emission pressure. During the operation of existing traditional HVAC systems, the waste heat generated by radiator heat exchange is directly lost to the external environment through exhaust and natural heat dissipation. There is a lack of systematic waste heat recovery, heat storage, and recycling structure design, resulting in low heat recovery and utilization rates. Therefore, it is necessary to design an energy-saving HVAC waste heat recovery device with higher heat recovery and utilization rates.

[0003] Currently, waste heat recovery devices are equipped with blowers that blow hot air and heat extraction fans that recover waste heat. Most existing waste heat recovery devices cannot integrate the hot air blowing duct and the waste heat recovery duct through reasonable duct optimization, and cannot allow the hot air blowing operation and the waste heat extraction and recovery operation to share a single fan, thereby reducing the number of fans and making it difficult for the recovery device to reduce energy consumption and cost. Summary of the Invention

[0004] In view of this, the present invention provides an energy-saving HVAC waste heat recovery device to solve the problem that hot air blowing and waste heat extraction and recovery operations cannot be performed by sharing a single fan, making it impossible to reduce the number of fans and hindering the energy consumption and cost reduction of the recovery device.

[0005] The technical solution proposed in this invention is as follows: an energy-saving HVAC waste heat recovery device, specifically including an air conditioner casing, a main radiator, and two symmetrically distributed auxiliary radiators. The main radiator and the two auxiliary radiators are respectively embedded in the three side walls of the air conditioner casing. A cross-shaped air intake pipe is provided between the two auxiliary radiators. The first end of the longitudinal section of the cross-shaped air intake pipe is connected to an axial flow fan, and a removable blocking plate is fixedly installed on the opening at the end of the longitudinal section. A retainer is installed inside the axial flow fan in a sliding assembly manner. It is composed of a retaining ring, a mounting ring, and multiple L-shaped support rods welded together. A motor is fixedly installed inside the mounting ring, and an impeller is fixedly installed on the motor shaft. A force transmission shaft is fixedly connected to the back of the motor housing, and the force transmission shaft passes through the longitudinal pipe section. Multiple raised tracks are provided on the inner circumference of the axial flow duct and the longitudinal pipe section, and a baffle is provided at the end of the raised track. Multiple sliding grooves are opened on the outer circumference of the retaining ring, and the sliding grooves slide with the raised tracks. A tightening bolt is threaded through the baffle and screwed on, and the head end of the tightening bolt is in contact with the top pressure of the force transmission shaft.

[0006] Furthermore, the tightening bolt is used to press the retaining ring against the baffle via the force transmission shaft, thereby positioning the motor and the retainer.

[0007] Furthermore, the tail end of the longitudinally placed pipe section penetrates the back side wall of the air conditioner housing, and the blocking plate is located on the outside of the air conditioner housing.

[0008] Furthermore, suction hoods are fixedly installed on opposite sides of both of the secondary heat sinks, and the suction hoods are fixedly connected to the first end of the horizontal pipe section on the cross-shaped suction pipe fitting. A blower hood is fixedly installed on the inner side of the main radiator. The head end of the axial flow fan is fixedly connected to the blower hood. The motor and impeller form a heating fan. The heating fan is used to draw ambient air from the outside through two auxiliary radiators to the blower hood via a cross-shaped suction pipe. The air is then heated by the main radiator and blown out for heating.

[0009] Furthermore, a heating tank and a circulation pump are fixedly installed inside the air conditioner housing above the axial flow duct. Multiple electric heating tubes are inserted inside the heating tank, and the circulation pump outlet pipe of the circulation pump is fixedly connected to the heating tank.

[0010] Furthermore, the main radiator has an inlet pipe and an outlet pipe welded to the water collection tanks at both ends of the main radiator, and the first end of the inlet pipe is fixedly connected to the heating tank. The auxiliary radiator has an outlet pipe and an inlet pipe welded to the water collection tanks at both ends. The first end of the outlet pipe is fixedly connected to the inlet pipe of the circulating pump, and the first end of the inlet pipe is fixedly connected to the outlet pipe of the main radiator. A circulation channel for the heat exchange medium is formed between the heating tank, the inlet pipe of the main radiator, the main radiator, the outlet pipe of the main radiator, the inlet pipe of the auxiliary radiator, the auxiliary radiator, the outlet pipe of the auxiliary radiator, the inlet pipe of the circulating pump, and the circulating pump.

[0011] Furthermore, a power connector is fixedly installed on the inner circumference of the retaining ring, and the power connector is provided with two power connection holes.

[0012] Furthermore, a male connector is fixedly installed on the inner circumference of the axial flow fan duct at a position corresponding to the female connector. The male connector has two connecting rods. When the heating fan and the retainer are installed in place, the connecting rods and the connecting holes are plugged in. A wire is connected between the female connector and the motor junction box. The wire is arranged along the L-shaped support rod.

[0013] Furthermore, a wire is connected between the male connector and the electrical control unit of the waste heat recovery device, which is used to introduce power into the male connector when the device is started, and guide the power to the junction box to supply power to the heating and ventilation fan via the female connector.

[0014] The present invention provides an energy-saving HVAC waste heat recovery device, which has the following beneficial effects: First, the residual heat of the heat exchange medium (low-heat medium) during circulation can be recovered and utilized through two auxiliary radiators. This recovered residual heat is used to preheat the ambient temperature air. This not only improves the utilization rate of the heat generated by the waste heat recovery device, but also allows the ambient temperature air to undergo double secondary heating by the auxiliary and main radiators to finally form a high-temperature blowing heating airflow. This helps to increase the temperature and heating rate of the blowing heating airflow. After the low-heat medium flows through the two auxiliary radiators, it is merged by the outlet pipes of the two auxiliary radiators and enters the inlet pipe of the circulation pump. Then it is transported to the circulation pump through the inlet pipe of the circulation pump, and after being drawn and energized by the inlet pipe of the circulation pump, it flows back to the heating tank for continued heating and recycling.

[0015] Second, this invention integrates the waste heat recovery airflow extraction channel and the heating airflow blowing channel by reasonably optimizing and improving the air duct. The two channels are connected by an axial flow fan and a heating fan. This allows the waste heat recovery airflow extraction operation and the heating airflow blowing operation to be performed by a single heating fan, eliminating the need to configure separate blowing fans and extraction fans for the two operations. This helps to reduce the number of fans required, thereby indirectly reducing the energy consumption and cost of the waste heat recovery device.

[0016] 3. Remove the blocking plate to disengage the tightening bolt from the transmission shaft. This allows the transmission shaft to be unlocked and loosened. The retainer and the HVAC fan can then be slid out of the axial flow duct and longitudinal pipe section to clean the dust on the impeller. This ensures the impeller's rotational cutting and air delivery effect. Since the tail end of the longitudinal pipe section penetrates the back side wall of the air conditioner casing, and the blocking plate is located on the outside of the air conditioner casing, it can be directly pulled out from the axial flow duct and longitudinal pipe section after the blocking plate is removed. This eliminates the tedious steps of disassembling the air conditioner casing and removing the entire axial flow duct from between the cross-shaped suction pipe and the suction hood to expose the impeller for cleaning. The operation is simple and time-saving, which helps to simplify the disassembly and exposure efficiency of the HVAC fan and impeller, and indirectly improves the ease of cleaning the impeller. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram: Figure 1 A frontal side view schematic diagram of the entire invention is shown; Figure 2 A schematic diagram of the entire invention from a rear side view is shown; Figure 3This diagram illustrates the relative positions of the components within the air conditioner housing in this invention. Figure 4 A diagram showing the relative positions of the main radiator, the secondary radiator, and the cross-shaped air intake pipe in this invention is provided. Figure 5 A bottom-view schematic diagram of the cross-shaped air intake pipe component of the present invention is shown; Figure 6 A half-section internal structure diagram of the cross-shaped suction pipe fitting in this invention is shown; Figure 7 This diagram shows a side view of the interior of the axial flow fan duct in a semi-sectional state according to the present invention. Figure 8 This invention shows a schematic diagram of the interior of the axial flow fan duct in a semi-sectional state from another side. Figure 9 A schematic diagram of the impeller and retaining ring in this invention is shown; Figure 10 A schematic diagram of the cage structure in this invention is shown; Figure 11 A schematic diagram of the male connector in this invention is shown; Figure 12 The present invention is shown Figure 8 Enlarged structural diagram of section A; Figure 13 A schematic diagram of the electrical connection female connector in this invention is shown.

[0020] List of reference numerals in the attached diagram: 1. Air conditioner casing; 2. Main radiator; 201. Main radiator inlet pipe; 202. Main radiator outlet pipe; 203. Air blower shroud; 3. Auxiliary radiator; 301. Auxiliary radiator outlet pipe; 302. Auxiliary radiator inlet pipe; 303. Air intake shroud; 4. Cross-shaped suction pipe fittings; 401. Blocking plate; 4011. Tightening bolts; 402. Horizontal pipe section; 403. Vertical pipe section; 5. Heating tank; 501. Electric heating element; 6. Circulating pump; 601. Circulating pump outlet pipe; 602. Circulating pump inlet pipe; 7. Axial flow fan duct; 8. Raised track; 801. Baffle; 9. Motor; 901. Transmission shaft; 902. Impeller; 903. Cage; 9031. Retaining ring; 9032. Mounting ring; 9033. L-shaped strut; 9034. Slide groove; 904. Junction box; 10. Male power connector; 1001. Power connector plug; 11. Power female connector; 1101. Power socket. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] The following is an embodiment of the present invention, please refer to it. Figures 1 to 13 : This embodiment proposes an energy-saving HVAC waste heat recovery device, including an air conditioner casing 1, a main radiator 2, and two symmetrically distributed auxiliary radiators 3. The main radiator 2 and the two auxiliary radiators 3 are respectively embedded in the three side walls of the air conditioner casing 1. A cross-shaped air intake pipe 4 is provided between the two auxiliary radiators 3. The first end of the longitudinal pipe section 403 on the cross-shaped air intake pipe 4 is connected to an axial flow duct 7. A removable blocking plate 401 is fixedly installed on the opening at the rear end of the longitudinal pipe section 403. A retainer 903 is installed inside the axial flow duct 7 in a sliding assembly manner. The retainer 903 consists of a retaining ring 9031, a mounting ring 9032, and three L-shaped support rods 903 welded around the two. Composed of 033, the motor 9 is fixedly installed inside the mounting ring 9032, and the impeller 902 is fixedly installed on the rotating shaft of the motor 9; the transmission shaft 901 is fixedly connected to the back of the housing of the motor 9, and the transmission shaft 901 passes through the longitudinal pipe section 403; the axial flow duct 7 and the inner circumference of the longitudinal pipe section 403 are jointly provided with three circumferentially distributed raised tracks 8, and the tail end of the raised track 8 is provided with a baffle 801; the outer circumference of the retaining ring 9031 is provided with three circumferentially distributed sliding grooves 9034, the sliding grooves 9034 slide in cooperation with the raised track 8, and the center of the blocking plate 401 is threaded with a tightening bolt 4011, the head end of the tightening bolt 4011 is in contact with the top pressure of the transmission shaft 901.

[0023] Preferably, the tightening bolt 4011 is used to press the retaining ring 9031 against the baffle 801 through the force transmission shaft 901, so as to achieve the positioning of the motor 9 and the retainer 903.

[0024] Preferably, the tail end of the longitudinally placed pipe section 403 penetrates the back side wall of the air conditioner housing 1, and the blocking plate 401 is located on the outside of the air conditioner housing 1.

[0025] Preferably, a suction hood 303 is fixedly installed on one side of each of the two auxiliary radiators 3, and the suction hood 303 is fixedly connected to the first end of the horizontal pipe section 402 on the cross-shaped suction pipe fitting 4; a blower hood 203 is fixedly installed on the inner side of the main radiator 2, and the first end of the axial flow fan 7 is fixedly connected to the blower hood 203. The motor 9 and the impeller 902 form a heating fan. The heating fan is used to draw ambient air from the outside through the two auxiliary radiators 3 to the suction hood 303 through the cross-shaped suction pipe fitting 4, and then blow it out for heating after being heated by the main radiator 2.

[0026] Preferably, a heating tank 5 and a circulation pump 6 are fixedly installed inside the air conditioner housing 1 above the axial flow duct 7. Multiple electric heating tubes 501 are inserted inside the heating tank 5, and the circulation pump outlet pipe 601 of the circulation pump 6 is fixedly connected to the heating tank 5.

[0027] Preferably, a main radiator inlet pipe 201 and a main radiator outlet pipe 202 are welded to the water collection tanks at the upper and lower ends of the main radiator 2, respectively, and the first end of the main radiator inlet pipe 201 is fixedly connected to the heating tank 5; an auxiliary radiator outlet pipe 301 and an auxiliary radiator inlet pipe 302 are welded to the water collection tanks at the upper and lower ends of the auxiliary radiator 3, respectively, and the first end of the auxiliary radiator outlet pipe 301 is fixedly connected to the circulation pump inlet pipe 602 of the circulation pump 6, and the first end of the auxiliary radiator inlet pipe 302 is fixedly connected to the main radiator outlet pipe 202.

[0028] Preferably, a power connector 11 is fixedly installed on the inner circumference of the retaining ring 9031, and the power connector 11 is provided with two power connector holes 1101.

[0029] Preferably, a male connector 10 is fixedly installed on the inner circumference of the axial flow fan duct 7 at a position corresponding to the position of the female connector 11. The male connector 10 is provided with two male connector rods 1001. When the heating and ventilation fan and the retainer 903 are installed in place, the male connector rods 1001 are inserted into the male connector 1101. A wire is connected between the female connector 11 and the junction box 904 of the motor 9. The wire is arranged along the L-shaped support rod 9033.

[0030] Preferably, a wire is connected between the male connector 10 and the electrical control unit of the waste heat recovery device, which is used to introduce power into the male connector 10 when the device is started, and guide the power to the junction box 904 via the female connector 11 to supply power to the heating and ventilation fan.

[0031] The working principle, specific details, implementation steps, functions and interrelationships of the features in the above embodiments, and the roles these features play in realizing this technical solution will be described and explained in detail below: A circulation channel for the heat exchange medium is formed between the heating tank 5, the main radiator inlet pipe 201, the main radiator 2, the main radiator outlet pipe 202, the auxiliary radiator inlet pipe 302, the auxiliary radiator 3, the auxiliary radiator outlet pipe 301, the circulation pump inlet pipe 602, and the circulation pump 6. The electric heating tube 501 is used to heat the heat exchange medium in the heating tank 5 to generate a high-temperature contact medium. The circulation pump 6 provides the driving force for the circulation of the heat exchange medium through its rotational pumping effect. After the heat exchange medium is heated and its temperature rises, it is transported to the main radiator 2, where the heat contained within it is transferred through… The fins on the main radiator 2 emit heat, and the airflow generated by the heating and ventilation fan is blown through the blower hood 203 to the main radiator 2 and out through the fins. During this process, the heat emitted by the fins is carried away by the outflowing airflow, which is simultaneously heated for heating. The high-temperature medium flowing through the main radiator 2 is cooled by the outflowing airflow, becoming a low-temperature medium. The low-temperature medium flows sequentially through the main radiator outlet pipe 202 and the secondary radiator inlet pipe 302 into the secondary radiator 3. As the low-temperature medium flows through the secondary radiator 3, its... The residual heat contained within is dissipated through the fins of the auxiliary radiator 3. The heating and ventilation fan, through its rotational suction effect, draws ambient air through the two auxiliary radiators 3, two suction hoods 303, and a cross-shaped suction pipe 4, then delivers it to the axial flow fan 7 and the blower hood 203 to form a heating airflow. As the ambient air passes through the auxiliary radiators 3 and their fins, it is preheated by the residual heat dissipated by the fins. Thus, the residual heat remaining in the heat exchange medium (low-heat medium) during its circulation process can be recovered and utilized through the two auxiliary radiators 3, and this recovered residual heat is used to preheat the ambient air. Not only can it improve the utilization rate of the heat generated by the waste heat recovery device, but it can also make the room temperature air undergo double secondary heating by the auxiliary radiator 3 and the main radiator 2 to finally form a high temperature blowing heating airflow, which helps to increase the temperature of the blowing heating airflow and its heating rate. The low heat medium flows through the two auxiliary radiators 3 and then merges at the outlet pipes 301 of the two auxiliary radiators and enters the circulation pump inlet pipe 602. Then it is transported to the circulation pump 6 through the circulation pump inlet pipe 602, and after being drawn and energized by the circulation pump inlet pipe 602, it flows back to the heating tank 5 for continued heating and recycling.

[0032] The cross-shaped suction pipe 4 and two auxiliary radiators 3 form an airflow suction channel for waste heat utilization, while the axial flow duct 7 and the blower hood 203 form an airflow blowing channel for heating. This invention integrates the airflow suction channel for waste heat utilization and the airflow blowing channel for heating by optimizing and improving the air duct. The two channels are connected by the axial flow duct 7 and the heating fan. This allows the airflow extraction operation for waste heat utilization and the airflow blowing operation for heating to be performed by a single heating fan, eliminating the need to configure separate blowers and suction fans for the two operations. This helps to reduce the number of fans required, thereby indirectly reducing the energy consumption and cost of the waste heat recovery device.

[0033] Through the power transmission of the transmission shaft 901, the tightening bolt 4011 can push the retaining ring 9031 against the baffle 801, positioning the retainer 903 and the heating and ventilation fan in the axial flow duct 7. The baffle 401 is then removed, disengaging the tightening bolt 4011 from the transmission shaft 901. This allows the transmission shaft 901 to be unlocked and released. The retainer 903 and the heating and ventilation fan are then slidably pulled out of the axial flow duct 7 and the longitudinal pipe section 403 via the transmission shaft 901 to clean the dust on the impeller 902, ensuring the rotating cutting and air delivery effect of the impeller 902. Due to the longitudinal pipe section 403... The tail end of 03 penetrates the back side wall of the air conditioner housing 1, and the blocking plate 401 is located on the outside of the air conditioner housing 1. Therefore, when the blocking plate 401 is disassembled and opened, it can be directly extracted from the axial flow duct 7 and the longitudinal pipe section 403. This eliminates the tedious steps of disassembling the air conditioner housing 1 and removing the entire axial flow duct 7 from between the cross-shaped air intake pipe 4 and the air intake cover 303 in order to expose the impeller 902 for cleaning. The operation is simple and time-saving, which helps to simplify the disassembly and exposure efficiency of the heating and ventilation fan and the impeller 902, and indirectly improves the ease of cleaning the impeller 902.

[0034] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0035] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0036] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An energy-saving HVAC waste heat recovery device, comprising an air conditioner casing (1), a main radiator (2), and two symmetrically distributed auxiliary radiators (3), wherein the main radiator (2) and the two auxiliary radiators (3) are respectively embedded in the three side walls of the air conditioner casing (1); Its features are, A cross-shaped air intake pipe (4) is provided between the two auxiliary radiators (3). The first end of the longitudinal section (403) on the cross-shaped air intake pipe (4) is connected to an axial flow fan (7). A removable blocking plate (401) is fixedly installed on the opening at the tail end of the longitudinal section (403). A retainer (903) is installed inside the axial flow fan (7) in a sliding assembly manner. The retainer (903) is composed of a retaining ring (9031), a mounting ring (9032), and multiple L-shaped support rods (9033) welded together. A motor (9) is fixedly installed inside the mounting ring (9032). An impeller is fixedly installed on the shaft of the motor (9). 902); The back of the housing of the motor (9) is fixedly connected to a force transmission shaft (901), which passes through the longitudinal pipe section (403); the inner circumference of the axial flow fan (7) and the longitudinal pipe section (403) is provided with multiple raised tracks (8), and the tail end of the raised track (8) is provided with a baffle (801); the outer circumference of the retaining ring (9031) is provided with multiple sliding grooves (9034), the sliding grooves (9034) slide with the raised track (8), and the plug plate (401) is threaded with a tightening bolt (4011), the head end of the tightening bolt (4011) is in contact with the top pressure of the force transmission shaft (901).

2. The energy-saving HVAC waste heat recovery device according to claim 1, characterized in that, The tightening bolt (4011) is used to press the retaining ring (9031) against the baffle (801) through the force transmission shaft (901) to achieve the positioning of the motor (9) and the retainer (903).

3. The energy-saving HVAC waste heat recovery device according to claim 1, characterized in that, The tail end of the longitudinally placed pipe section (403) penetrates the back side wall of the air conditioner housing (1), and the blocking plate (401) is located on the outside of the air conditioner housing (1).

4. The energy-saving HVAC waste heat recovery device according to claim 1, characterized in that, A suction hood (303) is fixedly installed on one side of each of the two auxiliary radiators (3), and the suction hood (303) is fixedly connected to the first end of the horizontal pipe section (402) on the cross-shaped suction pipe fitting (4); The inner side of the main radiator (2) is fixedly installed with a blower hood (203). The head end of the axial flow fan (7) is fixedly connected to the blower hood (203). The motor (9) and the impeller (902) form a heating fan. The heating fan is used to draw the ambient temperature air from the outside through the cross-shaped suction pipe (4) to the suction hood (303) through the two auxiliary radiators (3), and then blow it out for heating after being heated by the main radiator (2).

5. The energy-saving HVAC waste heat recovery device according to claim 1, characterized in that, The air conditioner housing (1) is fixedly installed above the axial flow duct (7) with a heating tank (5) and a circulation pump (6). Multiple electric heating tubes (501) are inserted inside the heating tank (5), and the circulation pump outlet pipe (601) of the circulation pump (6) is fixedly connected to the heating tank (5).

6. The energy-saving HVAC waste heat recovery device according to claim 5, characterized in that, The main radiator (2) has a main radiator inlet pipe (201) and a main radiator outlet pipe (202) welded to the water collection tanks at both ends. The first end of the main radiator inlet pipe (201) is fixedly connected to the heating tank (5). The auxiliary radiator (3) has an outlet pipe (301) and an inlet pipe (302) welded to the water collection tanks at both ends. The first end of the outlet pipe (301) is fixedly connected to the inlet pipe (602) of the circulating pump (6), and the first end of the inlet pipe (302) is fixedly connected to the outlet pipe (202) of the main radiator. A circulation channel for the heat exchange medium is formed between the heating tank (5), the inlet pipe (201) of the main radiator, the main radiator (2), the outlet pipe (202) of the main radiator, the auxiliary radiator inlet pipe (302), the auxiliary radiator (3), the outlet pipe (301) of the auxiliary radiator, the inlet pipe (602) of the circulating pump, and the circulating pump (6).

7. The energy-saving HVAC waste heat recovery device according to claim 4, characterized in that, A power connector (11) is fixedly installed on the inner circumference of the retaining ring (9031), and two power connector holes (1101) are provided on the power connector (11).

8. The energy-saving HVAC waste heat recovery device according to claim 7, characterized in that, A male connector (10) is fixedly installed on the inner circumference of the axial flow fan (7) at a position corresponding to the position of the female connector (11). The male connector (10) is provided with two male connectors (1001). When the heating fan and the retainer (903) are installed in place, the male connectors (1001) and the female connectors (1101) are plugged in and engaged. A wire is connected between the female connector (11) and the junction box (904) of the motor (9). The wire is arranged along the L-shaped support rod (9033).

9. An energy-saving HVAC waste heat recovery device according to claim 8, characterized in that, The male connector (10) is connected to the electrical control unit of the waste heat recovery device by a wire, which is used to introduce power into the male connector (10) when the device is started, and guide the power to the junction box (904) via the female connector (11) to supply power to the heating and ventilation fan.

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