Air source and geothermal source two-stage heat pump system

Abstract

The invention relates to the technical field of air source heat pumps, in particular to an air source and terrestrial heat source two-stage heat pump system which comprises an air source heat pump mechanism, the air source heat pump mechanism comprises a fin evaporator, a condenser, a compressor, a four-way valve and an expansion valve, and the terrestrial heat source heat pump mechanism comprises an underground heat exchanger and a fin radiator. A low-boiling-point secondary refrigerant is arranged in the underground heat exchanger, the output end of the underground heat exchanger is connected with an air inlet of the fin radiator through an air pipe, and the input end of the underground heat exchanger is connected with a liquid outlet of the fin radiator through a liquid return pipe; the air source heat pump and the ground source heat pump are coupled, and the fin radiator in the ground source heat pump is used for preheating the fin evaporator in the air source heat pump, so that the air source heat pump can obtain heat from air more easily, and the heating efficiency of the air source heat pump in severe winter is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and in particular to a two-stage heat pump system with air source and geothermal source. Background Art

[0002] As a key means of efficiently utilizing renewable energy, heat pump technology is widely used in building heating, industrial heating, and other fields. However, its operating performance is heavily dependent on ambient temperature, exposing significant limitations in low-temperature winter conditions.

[0003] Specifically, when the ambient temperature drops below -10°C, frost easily forms on the finned evaporator surface of an air-source heat pump, increasing air flow resistance and reducing heat exchange efficiency. Research data shows that in a -20°C environment, the heating capacity of a traditional air-source heat pump can drop by more than 50% compared to standard operating conditions (7°C), with the COP (coefficient of performance) dropping below 2.0. Even more seriously, when the temperature drops to -30°C, the evaporator struggles to effectively absorb heat from the air, and the compressor faces problems such as insufficient suction pressure and excessively high exhaust temperatures, and may even shut down for protection, making it impossible to meet basic heating needs. This performance shortcoming has greatly limited the promotion and application of air-source heat pumps in extremely cold regions.

[0004] In contrast, underground soil temperatures maintain a constant 10-15°C year-round (in mid-latitudes), minimally affected by surface climate change. Even in extreme winter temperatures, they can provide a continuous and stable supply of low-grade heat. Therefore, combining the stability of geothermal sources with the flexibility of air sources to create a hybrid heat pump system suitable for winter heating in extremely cold regions would overcome the inefficiency of air-source heat pumps during harsh winters. To this end, we propose a dual-stage heat pump system combining air and geothermal sources to effectively address these drawbacks. Summary of the Invention

[0005] The object of the present invention is to provide a two-stage heat pump system with air source and ground heat source, so as to solve the problems raised in the above background technology.

[0006] The present invention is achieved through the following technical solutions: an air source and ground heat source two-stage heat pump system, including an air source heat pump mechanism, the air source heat pump mechanism including a fin evaporator, a condenser, a compressor, a four-way valve and an expansion valve, and further comprising: A geothermal heat pump mechanism, comprising an underground heat exchanger and a finned radiator, wherein the underground heat exchanger contains a low-boiling-point refrigerant, the output end of the underground heat exchanger is connected to the air inlet of the finned radiator via an air pipe, and the input end of the underground heat exchanger is connected to the liquid outlet of the finned radiator via a liquid return pipe; The main chassis, the finned evaporator is located at the rear side of the main chassis, the front and rear side walls of the main chassis are both open, and a fan is also provided inside the main chassis and in front of the finned evaporator; A sub-chassis, the sub-chassis is located at the rear side of the main chassis, the rear side wall of the sub-chassis is open, and the fin heat sink is movably arranged in the sub-chassis; Wherein, a gear adjustment mechanism is further provided inside the auxiliary chassis, and the gear adjustment mechanism is used to drive the fin radiator to flip so that the fin radiator and the fin evaporator are aligned or staggered.

[0007] Optionally, the air inlet of the finned heat sink is connected to the air pipe through a hose, and the liquid outlet of the finned heat sink is connected to the liquid return pipe through a hose. Both the air pipe and the liquid return pipe pass through the side wall of the auxiliary chassis and extend into the inner side of the auxiliary chassis.

[0008] Optionally, there are two groups of fin heat sinks, which are symmetrically distributed on the left and right sides. The gear adjustment mechanism includes an upper holding assembly and a lower holding assembly corresponding to the two groups of fin heat sinks one by one. The upper holding assembly and the lower holding assembly are respectively installed on the top and bottom of one group of fin heat sinks. The top surface of the upper holding assembly is provided with a first main shaft, and the bottom surface of the lower holding assembly is provided with a second main shaft. The first main shaft and the second main shaft are rotatably connected to the upper and lower walls of the interior of the auxiliary chassis, respectively. The gear adjustment mechanism further includes two drive motors, which are fixedly mounted on the top wall of the auxiliary chassis. The output shafts of the two drive motors are respectively connected to the two first main shafts.

[0009] Optionally, the output shaft of the drive motor is connected to the corresponding first main shaft via a synchronous belt or chain transmission.

[0010] Optionally, each group of the fin heat sinks includes two fin heat sinks, the upper retaining assembly includes two upper retaining plates, the two upper retaining plates are respectively fixedly connected to the top walls of the two fin heat sinks, and the two upper retaining plates are hingedly arranged; the lower retaining assembly includes two lower retaining plates, the two lower retaining plates are respectively connected to the bottom walls of the two fin heat sinks, and the two lower retaining plates are hingedly arranged; The first main shaft and the second main shaft are respectively arranged on the upper holding plate and the lower holding plate close to the edge side.

[0011] Optionally, there is a hinge shaft between the two upper retaining plates, the hinge shaft is rotatably connected to an upper retaining plate near the edge side through a damping bearing, the hinge shaft is fixedly connected to an upper retaining plate near the middle side, and when one of the upper retaining plates rotates 180° around the hinge shaft, the two upper retaining plates can be distributed in a folded shape.

[0012] Optionally, a driven gear is provided at the top end of the hinge shaft, and a first arc-shaped rack and a second arc-shaped rack are provided on the inner top wall of the auxiliary chassis; when each group of fin heat sinks rotates outward around the first main axis, the driven gear can engage with the first arc-shaped rack and the second arc-shaped rack respectively; When the driven gear passes the first arc-shaped rack, the hinge shaft rotates 45 degrees inward; When the driven gear passes the second arc-shaped rack, the hinge shaft rotates 135 degrees inward.

[0013] Optionally, both left and right side walls of the auxiliary case are provided with ventilation holes, and both left and right side walls inside the auxiliary case are slidably provided with shielding plates, and the shielding plates have through openings.

[0014] Optionally, a drive shaft arranged vertically is rotatably provided on the inner wall of the auxiliary chassis, a driving gear is fixedly sleeved on the drive shaft, a driven rack is provided on the surface of the baffle, the driving gear and the driven rack are meshed, and the drive shaft and the first main shaft are connected via a synchronous belt transmission; When the two groups of finned heat sinks are aligned, the through openings and the air vents are staggered. When the two groups of fin heat sinks are rotated to be parallel to the side wall of the auxiliary chassis, the through openings and the air vents are aligned and distributed.

[0015] Optionally, the air vent is located on a side wall of the auxiliary chassis and close to a side of the main chassis, and a dustproof net is installed in the air vent.

[0016] Compared with the existing technology, the present invention provides a two-stage heat pump system with air source and ground heat source, which has the following beneficial effects: 1. This invention couples an air-source heat pump with a ground-source heat pump, allowing the finned radiator in the ground-source heat pump to preheat the finned evaporator in the air-source heat pump. This allows the air-source heat pump to more easily obtain heat from the air, helping to improve the heating efficiency of the air-source heat pump in harsh winters. 2. The gear adjustment mechanism of the present invention can control the alignment or misalignment of the finned heat sink and the finned evaporator, thereby reducing air resistance and ensuring the contact efficiency between the finned evaporator and the air under working conditions without preheating the air; 3. The finned heat sink of the present invention can also maintain a semi-expanded posture, which moderates air resistance while also preheating a portion of the air. Therefore, the present invention can change its form to adapt to a variety of environmental conditions, maintaining a balance between energy consumption and heating efficiency. 4. When the fin radiator in the present invention is adjusted to a fully expanded posture, the air vents on both sides of the sub-chassis are automatically opened to further reduce the air intake resistance of the main chassis, allowing more air to contact the fin evaporator, which helps to improve the heating efficiency of the fin evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the main chassis and auxiliary chassis structure of the present invention; Figure 3 This is a cross-sectional view of the main chassis and auxiliary chassis structure of the present invention; Figure 4 This is a schematic structural diagram of the finned heat sink of the present invention; Figure 5 This is a front view of the fin heat sink structure of the present invention; Figure 6 This is a top sectional view of the auxiliary chassis structure of the present invention; Figure 7 A top cross-sectional view of the auxiliary chassis structure of the present invention in another state; Figure 8 This is a schematic diagram of the shielding plate structure of the present invention; Figure 9 for Figure 8 The corresponding figure at point A is enlarged.

[0018] In the figure: 100, air source heat pump mechanism; 101, finned evaporator; 102, condenser; 103, compressor; 104, four-way valve; 105, expansion valve; 200, geothermal source heat pump mechanism; 201, underground heat exchanger; 202, finned radiator; 203, air pipe; 204, return pipe; 300, main chassis; 301, fan; 400, auxiliary chassis; 401, first arc rack; 402, first Two arc-shaped racks; 403, air vent; 404, baffle; 405, through-hole; 406, driving gear; 407, driven rack; 500, gear adjustment mechanism; 501, upper retaining assembly; 5011, upper retaining plate; 5012, hinge shaft; 502, lower retaining assembly; 5021, lower retaining plate; 503, first main shaft; 504, second main shaft; 505, drive motor; 506, driven gear. DETAILED DESCRIPTION

[0019] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1 - Figure 4A two-stage heat pump system with air source and geothermal source includes an air source heat pump mechanism 100. The air source heat pump mechanism 100 includes a fin evaporator 101, a condenser 102, a compressor 103, a four-way valve 104 and an expansion valve 105. The connection relationship between the above components is the same as that of the air source heat pump in the prior art. It is worth noting that the fin evaporator 101 in this embodiment is in the shape of a rectangular plate, and there are three rows of internal copper tubes.

[0021] This embodiment also includes a geothermal heat pump mechanism 200, which includes an underground heat exchanger 201 and a fin radiator 202. The underground heat exchanger 201 contains a low-boiling-point refrigerant. The output end of the underground heat exchanger 201 is connected to the air inlet of the fin radiator 202 through an air pipe 203, and the input end of the underground heat exchanger 201 is connected to the liquid outlet of the fin radiator 202 through a return liquid pipe 204. The low-boiling-point refrigerant can be R134a (tetrafluoroethane), which has a standard boiling point of -26.1°C, which is much lower than the underground soil temperature.

[0022] like Figure 1 As shown, underground heat exchanger 201 is buried underground at a depth of no less than 5 meters. The specific depth is determined by factors such as local soil moisture, altitude, and latitude. When the low-boiling-point coolant is located within underground heat exchanger 201, it boils and vaporizes due to the heat. The vaporized coolant then enters finned heat sink 202, releasing heat and liquefying. The liquefied coolant then returns to underground heat exchanger 201, forming a cycle.

[0023] This embodiment also includes a main case 300, the fin evaporator 101 is located at the rear side of the main case 300, and the condenser 102, compressor 103, four-way valve 104 and expansion valve 105 are also arranged inside the main case 300; the front and rear side walls of the main case 300 are both open, and a fan 301 is also provided inside the main case 300 and in front of the fin evaporator 101; when the fan is turned on, a negative pressure environment can be formed behind the fin evaporator 101, so that air passes through the fin evaporator 101 from back to front, and helps to increase the air convection speed.

[0024] like Figure 3As shown, a sub-chassis 400 is provided on the rear side of the main chassis 300. The rear side wall of the sub-chassis 400 is open, and the finned heat sink 202 is movably arranged within the sub-chassis 400. A gear adjustment mechanism 500 is also provided inside the sub-chassis 400. The gear adjustment mechanism 500 is used to drive the finned heat sink 202 to flip so that the finned heat sink 202 and the finned evaporator 101 are aligned or offset. When the finned heat sink 202 and the finned evaporator 101 are aligned, external air will enter the sub-chassis 400 through the opening on the rear side of the sub-chassis 400. The air will then pass through the radiator to be preheated, and then pass through the finned evaporator 101, thereby helping to improve the heating efficiency of the finned evaporator 101.

[0025] In some embodiments of the present application, the air inlet of the finned heat sink 202 is connected to the air pipe 203 via a flexible hose, and the liquid outlet of the finned heat sink 202 is connected to the liquid return pipe 204 via a flexible hose. Both the air pipe 203 and the liquid return pipe 204 penetrate the side wall of the sub-chassis 400 and extend into the interior of the sub-chassis 400. Specifically, the flexible hose is a rubber hose, and the side wall of the sub-chassis 400 has two mounting holes for the air pipe 203 and the liquid return pipe 204 to pass through.

[0026] In addition, there are two groups of fin radiators 202, which are symmetrically distributed on the left and right. The gear adjustment mechanism 500 is used to drive the two groups of fin radiators 202 to open or close in a double-door shape, thereby determining whether air passes through the fin radiators 202.

[0027] In summary, in the actual application of this embodiment, when the ambient temperature is below -20°C in winter, it will be difficult for the air source heat pump to obtain heat from the air. In order to improve the heating efficiency of the heat pump at this time, the gear adjustment mechanism 500 can be used to control the two sets of fin radiators 202 to be closed. At this time, the external air is always preheated by passing through the radiator first, and then passes through the fin evaporator 101, thereby improving the thermal efficiency of the air source heat pump; in addition, when the temperature is relatively high, such as above 0°C, the fin evaporator 101 can more easily obtain heat from the air. Therefore, in this state, the ground source heat pump mechanism 200 can be closed, and the two sets of fin radiators 202 can be unfolded at the same time, so that the external air can directly pass through the fin evaporator 101.

[0028] It is worth mentioning that turning off the geothermal heat pump mechanism 200 in a relatively high temperature environment can not only reduce its energy consumption, but also reduce the wind resistance when air enters the main box 300, increase the air convection speed, and at the same time reduce the energy consumption of the fan 301.

[0029] Example 2: Please refer to Figure 1 - Figure 7This embodiment proposes a two-stage heat pump system with air source and ground heat source. The difference between this embodiment and the first embodiment is that: The gear adjustment mechanism 500 includes an upper retaining assembly 501 and a lower retaining assembly 502, each corresponding to the two groups of finned heat sinks 202. The upper retaining assembly 501 and the lower retaining assembly 502 are respectively mounted on the top and bottom of one group of finned heat sinks 202. The top surface of the upper retaining assembly 501 is provided with a first main shaft 503, and the bottom surface of the lower retaining assembly 502 is provided with a second main shaft 504. The first main shaft 503 and the second main shaft 504 are respectively rotatably connected to the upper and lower walls of the interior of the auxiliary chassis 400, and the first main shaft 503 and the second main shaft 504 are located on the same vertical line. The gear adjustment mechanism 500 also includes two drive motors 505, which are fixedly mounted on the top wall of the auxiliary chassis 400. The output shafts of the two drive motors 505 are respectively connected to the two first main shafts 503. Specifically, the output shafts of the drive motors 505 are connected to the corresponding first main shafts 503 via a synchronous belt or chain transmission. Therefore, the two sets of fin heat sinks 202 can be directly driven to open or close in a double-door shape by driving the motor 505.

[0030] Specifically, each set of fin heat sinks 202 includes two fin heat sinks 202. The upper retaining assembly 501 includes two upper retaining plates 5011, which are fixedly connected to the top walls of the two fin heat sinks 202, and are hingedly connected to each other. The lower retaining assembly 502 includes two lower retaining plates 5021, which are connected to the bottom walls of the two fin heat sinks 202, and are hingedly connected to each other. In other words, the two fin heat sinks 202 in each set of fin heat sinks 202 can be folded at the hinged portion. It is worth mentioning that the first main axis 503 and the second main axis 504 are respectively arranged on the upper retaining plate 5011 and the lower retaining plate 5021 near the edge.

[0031] Furthermore, a hinge 5012 is provided between the two upper retaining plates 5011. The hinge 5012 is rotationally connected to the upper retaining plate 5011 near the edge via a damping bearing. The hinge 5012 is fixedly connected to the upper retaining plate 5011 near the center. When one of the upper retaining plates 5011 rotates 180° about the hinge 5012, the two upper retaining plates 5011 can be arranged in a folded shape. It is worth noting that the damping bearing has a rotational torque of no less than 8 N·m. Due to the damping bearing, the angle between the two upper retaining plates 5011 remains stable under normal conditions.

[0032] In this embodiment, a driven gear 506 is provided at the top of the hinge shaft 5012, and a first arc-shaped rack 401 and a second arc-shaped rack 402 are provided on the inner top wall of the sub-chassis 400; when each set of fin heat sinks 202 rotates outward around the first main axis 503, the driven gear 506 can engage with the first arc-shaped rack 401 and the second arc-shaped rack 402 respectively; specifically, when the driven gear 506 passes the first arc-shaped rack 401, the hinge shaft 5012 rotates inward by 45°; when the driven gear 506 passes the second arc-shaped rack 402, the hinge shaft 5012 rotates inward by 135°. Figure 7 As shown, that is, after the driven gear 506 passes through the first curved rack 401 and the second curved rack 402, the two upper retaining plates 5011 can be folded. It should be noted that the above-mentioned outward rotation refers to rotation toward the side wall of the auxiliary chassis 400, while the inward rotation refers to one upper retaining plate 5011 moving closer to the other upper retaining plate 5011.

[0033] Specifically, when the driving motor 505 controls the two first main shafts 503 to rotate 45 degrees outward, the finned heat sink 202 near the edge is in an inclined state, and the finned heat sink 202 near the middle is in a horizontal state. Figure 6 As shown, the air inlet and liquid outlet of the two-fin heat sink 202 near the edge are closed, leaving only the two-fin heat sink 202 in the middle in operation. At this point, air resistance is moderate, and some air can pass through the two-fin heat sink 202 and be preheated. Therefore, this operating mode is suitable for moderate air temperatures, such as 0°C to -10°C.

[0034] It is worth noting that keeping the middle side of the finned heat sink 202 in a horizontal position in operation has the advantage of allowing it to fully contact the air. Furthermore, compared to a fully closed state of the finned heat sink 202, this position creates less air resistance, allowing the fan 301 to operate at a lower power, thus reducing the fan's energy consumption and extending its service life.

[0035] Example 3: Please refer to Figure 1 - Figure 9 This embodiment proposes a two-stage heat pump system with air source and ground heat source. The difference between this embodiment and the first embodiment is that: Air vents 403 are provided on the left and right side walls of the sub-chassis 400 and at one end close to the main chassis 300, and a dustproof net is also installed in the air vents 403. Shielding plates 404 are slidingly provided on the left and right side walls inside the sub-chassis 400, and the shielding plates 404 have a through-opening 405. The shielding plates 404 can slide in the front-to-back direction to achieve alignment or misalignment of the through-opening 405 and the air vents 403.

[0036] Specifically, the inner wall of the sub-chassis 400 is provided with a driving shaft arranged vertically, a driving gear 406 is fixedly mounted on the driving shaft, a driven rack 407 is provided on the surface of the shielding plate 404, the driving gear 406 and the driven rack 407 are meshed with each other, and the driving shaft and the first main shaft 503 are connected by a synchronous belt transmission; when the two groups of fin heat sinks 202 are aligned, the through-holes 405 and the air vents 403 are staggered; when the two groups of fin heat sinks 202 are rotated to be parallel to the side wall of the sub-chassis 400, the through-holes 405 and the air vents 403 are aligned. In other words, in the case of Figure 7 In the state shown, the finned heat sink 202 is fully expanded, and the air vent 403 is aligned with the through-hole 405; at this time, the geothermal source heat pump mechanism 200 is powered off and shut down, and only the air source heat pump mechanism 100 is working, so it is suitable for use in scenarios with higher temperatures, such as above 0°C.

[0037] It should be noted that when the local heat source heat pump mechanism 200 is not working, the smaller the air intake resistance of the fin evaporator 101 is, the better; therefore, aligning the air vent 403 and the through-hole 405 also helps to make the air intake of the fin evaporator 101 smoother.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An air source and ground source two-stage heat pump system, comprising an air source heat pump mechanism, wherein the air source heat pump mechanism comprises a finned evaporator, a condenser, a compressor, a four-way valve and an expansion valve, characterized in that: Also includes: A geothermal heat pump mechanism, comprising an underground heat exchanger and a finned radiator, wherein the underground heat exchanger contains a low-boiling-point refrigerant, the output end of the underground heat exchanger is connected to the air inlet of the finned radiator via an air pipe, and the input end of the underground heat exchanger is connected to the liquid outlet of the finned radiator via a liquid return pipe; The main chassis, the finned evaporator is located at the rear side of the main chassis, the front and rear side walls of the main chassis are both open, and a fan is also provided inside the main chassis and in front of the finned evaporator; A sub-chassis, the sub-chassis is located at the rear side of the main chassis, the rear side wall of the sub-chassis is open, and the fin heat sink is movably arranged in the sub-chassis; Wherein, a gear adjustment mechanism is further provided inside the auxiliary chassis, and the gear adjustment mechanism is used to drive the fin radiator to flip so that the fin radiator and the fin evaporator are aligned or staggered.

2. The air source and ground source two-stage heat pump system according to claim 1, characterized in that: The air inlet of the finned radiator is connected to the air pipe through a hose, and the liquid outlet of the finned radiator is connected to the liquid return pipe through a hose. Both the air pipe and the liquid return pipe pass through the side wall of the auxiliary chassis and extend into the inner side of the auxiliary chassis.

3. The air source and geothermal source two-stage heat pump system according to any one of claims 1 or 2, characterized in that: There are two groups of finned heat sinks, which are symmetrically distributed on the left and right. The gear adjustment mechanism includes an upper holding assembly and a lower holding assembly corresponding to the two groups of finned heat sinks. The upper holding assembly and the lower holding assembly are respectively installed on the top and bottom of one group of finned heat sinks. The top surface of the upper holding assembly is provided with a first main shaft, and the bottom surface of the lower holding assembly is provided with a second main shaft. The first main shaft and the second main shaft are respectively rotatably connected to the upper and lower walls inside the auxiliary chassis; The gear adjustment mechanism further includes two drive motors, which are fixedly mounted on the top wall of the auxiliary chassis. The output shafts of the two drive motors are respectively connected to the two first main shafts.

4. The air source and ground source two-stage heat pump system according to claim 3, characterized in that: The output shaft of the driving motor is connected to the corresponding first main shaft through a synchronous belt or chain transmission.

5. The air source and ground source two-stage heat pump system according to claim 3, characterized in that: Each group of fin heat sinks includes two fin heat sinks, the upper retaining assembly includes two upper retaining plates, the two upper retaining plates are respectively fixedly connected to the top walls of the two fin heat sinks, and the two upper retaining plates are hingedly arranged; the lower retaining assembly includes two lower retaining plates, the two lower retaining plates are respectively connected to the bottom walls of the two fin heat sinks, and the two lower retaining plates are hingedly arranged; The first main shaft and the second main shaft are respectively arranged on the upper holding plate and the lower holding plate close to the edge side.

6. The air source and ground source two-stage heat pump system according to claim 5, characterized in that: There is a hinge shaft between the two upper retaining plates, which is rotatably connected to an upper retaining plate near the edge side through a damping bearing, and the hinge shaft is fixedly connected to an upper retaining plate near the middle side. When one of the upper retaining plates rotates 180° around the hinge shaft, the two upper retaining plates can be distributed in a folded shape.

7. The air source and ground source two-stage heat pump system according to claim 6, characterized in that: A driven gear is provided at the top end of the hinge shaft, and a first arc-shaped rack and a second arc-shaped rack are provided on the inner top wall of the auxiliary chassis; when each group of fin heat sinks rotates outward around the first main axis, the driven gear can engage with the first arc-shaped rack and the second arc-shaped rack respectively; When the driven gear passes the first arc-shaped rack, the hinge shaft rotates 45 degrees inward; When the driven gear passes the second arc-shaped rack, the hinge shaft rotates 135 degrees inward.

8. The air source and ground source two-stage heat pump system according to claim 3, characterized in that: The left and right side walls of the auxiliary case are both provided with ventilation holes, and the left and right side walls inside the auxiliary case are both slidably provided with shielding plates, and the shielding plates have through openings.

9. The air source and ground source two-stage heat pump system according to claim 8, characterized in that: A drive shaft arranged vertically is rotatably provided on the inner wall of the auxiliary chassis, a driving gear is fixedly sleeved on the drive shaft, a driven rack is provided on the surface of the shielding plate, the driving gear and the driven rack are meshed, and the drive shaft and the first main shaft are connected by a synchronous belt transmission; When the two groups of finned heat sinks are aligned, the through openings and the air vents are staggered. When the two groups of fin heat sinks are rotated to be parallel to the side wall of the auxiliary chassis, the through openings and the air vents are aligned and distributed.

10. The air source and ground source two-stage heat pump system according to claim 8, characterized in that: The air vent is located on the side wall of the auxiliary chassis and close to one side of the main chassis. A dustproof net is also installed in the air vent.

Images