A heat exchanger for a two-stage cascade heat pump

Abstract

The present invention discloses a heat exchanger for a two-stage cascade heat pump, which belongs to the technical field of heat pump switches, including a chassis, which is composed of a supporting frame, a bottom bracket, a protective plate, a top cover, a main control cabinet and an evaporator. A top sector is provided above the evaporator, and a heat exchange unit is provided below the evaporator. The heat exchange unit includes a low-temperature stage circuit and a high-temperature stage circuit. De-icing mechanisms are provided on both sides of the bottom of the evaporator, air supply mechanisms are provided on both sides of the heat exchange unit, and a jet fan is provided on the outside of the chassis; the jet fan generates a strong cylindrical high-speed airflow, which is relayed by multiple jet fans to blow away a large amount of deposited cold air generated in a large array heat exchanger unit, thereby avoiding the formation of a cold island effect that affects the heat exchange effect; the present invention has the advantages of quickly removing cold air around the evaporator, avoiding frost, high defrosting efficiency and strong working stability of the heat pump.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump exchangers, and in particular to a heat exchanger for a double-stage cascade heat pump. Background Art

[0002] A heat pump is a highly efficient energy conversion device that cleverly utilizes the energy contained in the air to generate heat. The heat pump operates by efficiently collecting and integrating low-grade heat energy from the air through internal circulation, converting it into a high-temperature heat source. The resulting heat is not only higher in temperature but also more stable in quality, meeting various heating and hot water supply needs. Compared to traditional heating and hot water supply methods, it can significantly reduce energy consumption and achieve energy savings.

[0003] The heat pumps in the existing technology are prone to generating a large amount of cold air accumulation during use. Since the heat pump equipment absorbs the surrounding heat through the evaporator during operation, the air temperature around the evaporator gradually decreases. As time goes by, the air circulation around the heat pump is seriously affected, forming a relatively static low-temperature area, which further affects the normal operation of the heat pump equipment. Due to poor air circulation, the heat pump is difficult to effectively absorb enough heat from the surrounding environment, resulting in a decrease in its heating efficiency. As the temperature continues to drop, the effect of the entire heat pump system will also be seriously affected. Not only will it fail to meet the expected heating and hot water supply needs, it may also increase energy consumption and operating costs.

[0004] Chinese patent document CN113776109A discloses an air source heat pump module and a tower air source heat pump. By modifying the heat pump from a vertical position to a horizontal position and setting the air outlet buckle to a side air outlet mode, the air intake and air outlet are respectively carried out from both sides of the heat pump, avoiding the cold island effect and improving the air circulation to a certain extent. However, the heating efficiency of the heat pump equipment is closely related to its contact area with the air and the air circulation conditions. The horizontal layout will lead to a reduction in the contact area between the heat pump equipment and the air, or make the air circulation not smooth enough, thereby affecting its heating effect. Especially in low temperature environments such as winter, this effect may be more obvious. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat exchanger for a two-stage cascade heat pump in order to solve the problem that a large amount of cold air is easily accumulated during the operation of a common source pump, which affects the heating efficiency.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: it includes a chassis, which is composed of a supporting frame, a bottom bracket, a protective plate, a top cover, a main control cabinet and an evaporator. A top sector is provided above the evaporator, and a heat exchange unit is provided below the evaporator. The heat exchange unit includes a low-temperature stage circuit and a high-temperature stage circuit. De-icing mechanisms are provided on both sides of the bottom of the evaporator, and air supply mechanisms are provided on both sides of the heat exchange unit. A jet fan is provided on the outside of the chassis; the jet fan generates a strong cylindrical high-speed airflow, which is relayed by multiple jet fans to blow away a large amount of deposited cold air generated in the large array heat exchanger unit, thereby avoiding the formation of a cold island effect that affects the heat exchange effect.

[0007] Furthermore, the de-icing mechanism includes two circular mounting frames, and the two sides of the two circular mounting frames are respectively connected to the support frame and the evaporator by screws. A fan module composed of a plurality of fans is provided on the inner side of the circular mounting frame, and a C-shaped connecting piece is provided at one end of the fan module, and a transmission mounting plate is provided at one end of the fan module. The C-shaped connecting piece and the transmission mounting plate are both connected to the circular mounting frame by screws, and the two ends of the fan module are respectively connected to the C-shaped connecting piece and the transmission mounting plate by a rotating shaft; the fan module draws the hot air generated when the heat exchange unit is in operation to the evaporator, which can slightly increase the heat around the evaporator and thereby increase the heat exchange efficiency.

[0008] Furthermore, a servo motor is installed on the top of the transmission mounting plate, a driving gear is installed on the output end of the servo motor, a driven gear is installed on the outer side of the rotating shaft at one end of the fan module and is meshed with the driving gear for transmission, a dust cover is provided on the outer side of the driving gear and the driven gear, the dust cover is connected to the transmission mounting plate by screws, and the servo motor is electrically connected to the main control cabinet; the servo motor rotates the fan module through the gear set, adjusts the angle of the fan module blowing toward the evaporator, and blows the hot air generated by the heat exchange unit directly to the part of the bottom of the fin condenser that is prone to ice formation through the fan module, forming a melting effect to avoid a large amount of ice hanging that affects the heat exchange efficiency.

[0009] Furthermore, the air supply mechanism includes a plate-shaped air supply box, which is connected to the support frame by screws, and a transfer box body is installed on the side of one end of the air supply box, and a ventilation pipe is installed on the side of the transfer box body. The air supply box, the transfer box body and the ventilation pipe are connected by design, and a plurality of air guide plates are fixed on the inside of the air supply box, and the air guide plates are arranged equidistantly and tilted in a trumpet shape. A plurality of ventilation holes are penetrated on one side wall of the air supply box, and the ventilation holes are located between two adjacent air guide plates and tilted in a trumpet shape. A vertical ventilation hole is penetrated at the outermost end of the side wall of the air supply box, and the ventilation pipe is connected to the external fan after passing through the protective plate.

[0010] Furthermore, the top sector includes a fan mounting bracket, which is connected to the top cover and the evaporator by screws. Several large fans are installed on the inside of the fan mounting bracket, and an infrared sensor is installed at the bottom of the fan mounting bracket, which is electrically connected to the main control cabinet. The infrared sensor monitors the parts of the bottom of the fin condenser that are prone to ice formation, and transmits an electrical signal to the main control when it finds that the freezing point has been reached. The main control starts the servo motor to flip the fan module, thereby heating and melting the bottom of the fin condenser.

[0011] Furthermore, the evaporator includes a pair of fin condensers, and a refrigerant output pipe and a refrigerant input pipe are provided at one end of the fin condenser. The refrigerant output pipe and the refrigerant input pipe are both connected to the fin condenser. A heat conduction cavity is provided at the bottom of the fin condenser and is connected by screws. A temperature sensor is also installed on the evaporator; the refrigerant input pipe is composed of a main input pipe and several auxiliary input pipes in parallel, and the auxiliary input pipes are connected to the fin condenser. The refrigerant output pipe is merged through a diversion pipe to form a single output pipe with a thicker diameter.

[0012] Furthermore, a plurality of heat dissipation holes are provided on both sides of the heat conduction cavity, a heat conduction interface is installed at one end of the heat conduction cavity, a heat energy adapter is installed at the output end of the heat conduction interface, and a connecting pipe at the output end of the heat energy adapter passes through the air supply box; the heat energy adapter is connected to the supporting frame, and the heat dissipation holes are used to discharge excess heat in the heat conduction cavity and dissipate it to the vicinity of the fin condenser. When the connecting pipe is connected to the external solar energy equipment, the heat energy provided by the solar energy equipment is converted with the medium through the heat energy adapter and sent into the heat conduction cavity to heat the fin condenser.

[0013] Furthermore, the low-temperature circuit includes three low-temperature compressors installed in parallel, and shock absorbers are provided between the three low-temperature compressors and the bottom bracket and connected by screws. A low-temperature heat storage condenser is provided on one side of the three low-temperature compressors, and a low-temperature gas-liquid separator is provided on the other side of the three low-temperature compressors and connected by pipelines. The low-temperature heat storage condenser and the low-temperature gas-liquid separator are both connected to the bottom bracket by screws. A four-way valve is provided on the side of the low-temperature gas-liquid separator, and the four-way valve is connected to the bottom bracket by brackets and screws. The four ports on the four-way valve are respectively connected to the low-temperature compressor and the refrigerant input The pipe, the low-temperature thermal storage condenser, and the low-temperature gas-liquid separator are connected by a pipeline; the low-temperature compressor is at least a scroll compressor, a rotor compressor, a piston compressor, a screw compressor and a centrifugal compressor, one or more of which are used in combination; the low-temperature thermal storage condenser is a shell and tube heat exchanger and a sleeve heat exchanger, the heat exchanger of the low-temperature thermal storage condenser is not provided with a liquid storage function and adopts a hollow design for filling with heat storage material, the heat storage material is at least a combination of paraffin, a composite salt, a hydrated salt and a polyol, the low-temperature gas-liquid separator is connected in series with the low-temperature compressor and the four-way valve to form a small loop.

[0014] Furthermore, the high-temperature stage circuit includes a high-temperature stage compressor, the high-temperature stage compressor is connected to the bottom bracket by screws, a high-temperature stage condenser is provided on one side of the high-temperature stage compressor and is connected through a pipeline, an intermediate heat exchanger is provided on the other side of the high-temperature stage compressor, the high-temperature stage condenser and the intermediate heat exchanger are both connected to the bottom bracket by screws, a high-temperature stage throttle valve is provided between the intermediate heat exchanger and the evaporator, the high-temperature stage throttle valve is connected to the support frame by buckles and screws, a liquid reservoir is provided on the side of the intermediate heat exchanger, and both ends of the high-temperature stage throttle valve are connected to the condenser The media output pipe and the liquid reservoir are connected by a pipeline. A low-temperature throttle valve is provided on the side of the liquid reservoir. One end of the low-temperature throttle valve is connected to the evaporator through a pipeline. The ports of the intermediate heat exchanger are respectively connected to the high-temperature compressor, the low-temperature throttle valve, the low-temperature heat storage condenser, and the liquid reservoir through pipelines; the high-temperature compressor and the low-temperature compressor are of the same model, the high-temperature condenser is a shell and tube heat exchanger or a sleeve heat exchanger, and the low-temperature throttle valve and the high-temperature throttle valve are at least selected from one or more of a thermal expansion valve, an electronic expansion valve and a capillary tube.

[0015] Furthermore, the shock-absorbing device includes a connecting kit, which is connected to the low-temperature compressor by buckles and screws. Two mounting plates are provided under the connecting kit, and a number of rubber shock-absorbing pads are provided between the mounting plate and the connecting kit. The connecting kit, the rubber shock-absorbing pad and the mounting plate are fastened together by screws. A number of rubber shock-absorbing pads are also provided under the mounting plate, and the mounting plate, the rubber shock-absorbing pad and the bottom bracket are fastened together by screws. The three low-temperature compressors are connected to the mounting plate. When a single or two of the low-temperature compressors are started to work, the vibration is transmitted to the mounting plate, so that the three low-temperature compressors, the connecting kit, the rubber shock-absorbing pad and the connecting screws vibrate regularly, thereby avoiding the situation where some of the low-temperature compressors do not vibrate but the screws vibrate, causing the connection to loosen.

[0016] Beneficial effects: The present invention has reasonable design, simple and stable structure, strong practicality, and has the following beneficial effects:

[0017] 1. In the solution of the present invention, the cascade heat pump circulation system adopts a coupled design of a low-temperature circuit and a high-temperature circuit. The low-temperature circuit absorbs low-temperature heat from the evaporator through three parallel compressors. After switching through a four-way valve, the low-temperature thermal storage condenser is filled with phase change materials such as paraffin wax / compound salt to store and release heat. The high-temperature circuit receives heat from the low-temperature stage through an intermediate heat exchanger. After secondary heating by the high-temperature compressor, high-quality heat energy is output through the high-temperature condenser. The refrigerant flow is coordinated by a throttle valve between the two circuits to achieve high-efficiency operation over a wide temperature range.

[0018] 2. In the solution of the present invention, a low-temperature thermal storage condenser is added to the low-temperature circuit of the cascade heat pump system. The low-temperature thermal storage condenser is not only connected to the intermediate heat exchanger via the refrigerant, but also to the high-temperature condenser via the heating medium, forming a cross-cascade heat pump system. The time accuracy requirements for coupling the high-temperature circuit and the low-temperature circuit through the intermediate heat exchanger are greatly reduced, and the operating stability of the cascade heat pump system is improved.

[0019] 3. In the solution of the present invention, the low-temperature thermal storage condenser is filled with thermal storage material. In the event of a sudden power outage during the operation of the heat pump, the thermal storage material can provide heat to the low-temperature thermal storage condenser and simultaneously provide heat to the high-temperature condenser, preventing the water in the high-temperature condenser from freezing and expanding, causing fatal damage to the heat pump, thereby greatly improving the anti-freeze capability.

[0020] 4. In the present invention, a rotatable fan module is installed at the bottom of the evaporator. The servo motor drives the gear set to achieve 0-80° angle adjustment. When the infrared sensor detects that the temperature at the bottom of the finned condenser reaches the freezing point, the main control system activates the fan module to rotate towards the ice area, directional sweeping the waste hot air generated by the heat exchanger during operation. Combined with the heat transfer cavity to provide auxiliary heating through solar energy, rapid ice melting is achieved. The de-icing process works synergistically with the cylindrical high-speed airflow generated by the jet fan to eliminate the "cold island effect" caused by cold air accumulation.

[0021] 5. The present invention adopts a three-stage air supply structure. The air guide plates on both sides of the heat exchanger unit and the trumpet-shaped vents form laminar air supply, promoting air circulation within the heat exchanger unit and preventing heat accumulation. The reversible fan module in the middle forms a low-to-high air transport, promoting the flow of hot air to the evaporator. The large fan on the top creates a negative pressure drainage. The jet fan array penetrates the gaps in the heat exchanger array through relay-type high-speed airflow, reducing boundary layer thermal resistance. The wind field system is linked with the temperature sensor to dynamically adjust the wind speed and angle according to the heat load, thereby improving the overall heat exchange rate.

[0022] 6. In the present invention, three low-temperature compressors form an integrated vibration damping system through a connection kit and rubber shock-absorbing pads. The mass-spring effect is used to unify the vibration frequency to a consistent amplitude range to avoid local resonance. The thermal storage condenser stores excess heat during low loads, and the four-way valve is switched to achieve time-shifting of heat energy during peak hours. The system monitors operating parameters in real time through the main control cabinet and uses algorithms to optimize the compressor start-stop combination and wind farm configuration, thereby improving the overall energy efficiency ratio to a high level.

[0023] 7. In the solution of the present invention, when a large amount of cold air accumulates in the evaporator to form ice and frost, the heat pump enters the defrost mode, and the refrigerant flows from the intermediate heat exchanger to the low-temperature heat storage condenser. The heat conducted to the refrigerant through the high-temperature circuit melts the frost outside the low-temperature circuit, thereby preventing frost from affecting the normal use of the heat pump equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0026] Figure 3 Schematic diagram of the evaporator structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of local A of the present invention;

[0028] Figure 5 It is a schematic diagram of the local structure of the evaporator of the present invention;

[0029] Figure 6This is a schematic diagram of the top sector structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the de-icing mechanism of the present invention;

[0031] Figure 8 This is an exploded view of the air supply mechanism structure of the present invention;

[0032] Figure 9 This is a schematic structural diagram of the heat exchange unit of the present invention;

[0033] Figure 10 Schematic diagram of the structure of the shock absorbing device of the present invention.

[0034] In the figure: 1-chassis, 2-evaporator, 3-top sector, 4-heat exchange unit, 5-de-icing mechanism, 6-air supply mechanism, 7-jet fan;

[0035] 21- finned condenser, 22- refrigerant output pipe, 23- refrigerant input pipe, 24- heat transfer chamber, 25- temperature sensor, 31- fan mounting bracket, 32- large fan, 33- infrared sensor, 41- low temperature circuit, 42- high temperature circuit, 51- circular mounting bracket, 52- fan module, 53- C-type connector, 54- transmission mounting plate, 55- servo motor, 56- driving gear, 57- driven gear, 61- air supply box, 62- transfer box, 63- ventilation pipe, 64- air guide plate, 65- vent, 66- vertical vent;

[0036] 241-heat dissipation hole, 242-heat conduction interface, 243-heat energy adapter, 411-low-temperature compressor, 412-vibration damping device, 413-low-temperature thermal storage condenser, 414-low-temperature gas-liquid separator, 415-four-way valve, 416-low-temperature throttle valve, 421-high-temperature compressor, 422-high-temperature condenser, 423-intermediate heat exchanger, 424-high-temperature throttle valve, 425-liquid reservoir;

[0037] 4121-Connection kit, 4122-Mounting plate, 4123-Rubber shock-absorbing pads. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Combine Figure 1 and Figure 10As shown, a heat exchanger for a two-stage cascade heat pump includes a chassis 1, which is composed of a supporting frame, a bottom bracket, a protective plate, a top cover, a main control cabinet and an evaporator 2. A top sector 3 is provided above the evaporator 2, and a heat exchange unit 4 is provided below the evaporator 2. The heat exchange unit 4 includes a low-temperature stage circuit 41 and a high-temperature stage circuit 42. De-icing mechanisms 5 are provided on both sides of the bottom of the evaporator 2, and air supply mechanisms 6 are provided on both sides of the heat exchange unit 4. A jet fan 7 is provided on the outside of the chassis 1; the jet fan 7 generates a strong cylindrical high-speed airflow, which is relayed by multiple jet fans 7 to blow away a large amount of deposited cold air generated in the large array heat exchanger unit, thereby avoiding the formation of a cold island effect that affects the heat exchange effect.

[0040] Combine Figure 3 and Figure 7 As shown, the de-icing mechanism 5 includes two circular mounting frames 51, and the two sides of the two circular mounting frames 51 are respectively connected to the support frame and the evaporator 2 by screws. A fan module 52 composed of a plurality of fans is provided on the inner side of the circular mounting frame 51, and a C-shaped connecting piece 53 is provided at one end of the fan module 52. A transmission mounting plate 54 is provided at one end of the fan module 52, and the C-shaped connecting piece 53 and the transmission mounting plate 54 are both connected to the circular mounting frame 51 by screws. The two ends of the fan module 52 are respectively connected to the C-shaped connecting piece 53 and the transmission mounting plate 54 by a rotating shaft; the fan module 52 draws the hot air generated by the heat exchange unit 4 when it is running to the evaporator 2, which can slightly increase the heat around the evaporator 2 and thus increase the heat exchange efficiency.

[0041] Combine Figure 7 As shown, a servo motor 55 is installed on the top of the transmission mounting plate 54, and a driving gear 56 is installed on the output end of the servo motor 55. A driven gear 57 is installed on the outside of the rotating shaft at one end of the fan module 52 and is meshed with the driving gear 56 for transmission. A dust cover is provided on the outside of the driving gear 56 and the driven gear 57. The dust cover is connected to the transmission mounting plate 54 by screws, and the servo motor 55 is electrically connected to the main control cabinet; the servo motor 55 rotates the fan module 52 through the gear set, adjusts the angle of the fan module 52 blowing toward the evaporator 2, and blows the hot air generated by the heat exchange unit 4 directly to the part of the bottom of the fin condenser 21 that is prone to ice formation through the fan module 52, forming a de-icing effect to prevent a large amount of ice from affecting the heat exchange efficiency.

[0042] Combine Figure 8As shown, the air supply mechanism 6 includes a plate-shaped air supply box 61, which is connected to the supporting frame by screws, a transfer box body 62 is installed on the side of one end of the air supply box 61, and a ventilation pipe 63 is installed on the side of the transfer box body 62. The air supply box 61, the transfer box body 62 and the ventilation pipe 63 are connected. A number of air guide plates 64 are fixed on the inside of the air supply box 61, and the air guide plates 64 are arranged at equal distances and are tilted in a trumpet shape. A number of ventilation holes 65 are penetrated on one side wall of the air supply box 61, and the ventilation holes 65 are located between two adjacent air guide plates 64 and are tilted in a trumpet shape. A vertical ventilation hole 66 is penetrated at the outermost end of the side wall of the air supply box 61, and the ventilation pipe 63 is connected to the external fan after passing through the protective plate.

[0043] Combine Figure 1 and Figure 6 As shown, the top sector 3 includes a fan mounting bracket 31, which is connected to the top cover and the evaporator 2 by screws. Several large fans 32 are installed on the inside of the fan mounting bracket 31, and an infrared sensor 33 is installed at the bottom of the fan mounting bracket 31. The infrared sensor 33 is electrically connected to the main control cabinet; the infrared sensor 33 monitors the part of the bottom of the fin condenser 21 that is prone to ice formation, and transmits an electrical signal to the main control when it finds that the freezing point has been reached. The main control starts the servo motor 55 to flip the fan module 52, thereby heating the bottom of the fin condenser 21 and melting ice.

[0044] Combine Figures 2 to 5 As shown, the evaporator 2 includes a pair of fin condensers 21, and a refrigerant output pipe 22 and a refrigerant input pipe 23 are provided at one end of the fin condenser 21. The refrigerant output pipe 22 and the refrigerant input pipe 23 are both connected to the fin condenser 21. A heat conduction cavity 24 is provided at the bottom of the fin condenser 21 and is connected by screws. A temperature sensor 25 is also installed on the evaporator 2; the refrigerant input pipe is composed of a main input pipe and several auxiliary input pipes in parallel, the auxiliary input pipes are connected to the fin condenser 21, and the refrigerant output pipe 22 is merged through the diversion pipe to form a single output pipe with a thicker diameter.

[0045] Combine Figure 3 and Figure 5 As shown, a plurality of heat dissipation holes 241 are provided on both sides of the heat conduction cavity 24. A heat conduction interface 242 is installed at one end of the heat conduction cavity 24. A heat energy adapter 243 is installed at the output end of the heat conduction interface 242. The connecting pipe at the output end of the heat energy adapter 243 passes through the air supply box 61. The heat energy adapter 243 is connected to the support frame. The heat dissipation holes 241 are used to discharge excess heat in the heat conduction cavity 24 and dissipate it to the vicinity of the fin condenser 21. When the connecting pipe is connected to the external solar energy equipment, the heat energy provided by the solar energy equipment is converted with the medium through the heat energy adapter 243 and then sent to the heat conduction cavity 24 to heat the fin condenser 21.

[0046] Combine Figure 9 As shown, the low-temperature circuit 41 includes three low-temperature compressors 411 installed in parallel, a shock absorber 412 is provided between the three low-temperature compressors 411 and the bottom bracket and connected by screws, a low-temperature heat storage condenser 413 is provided on one side of the three low-temperature compressors 411, and a low-temperature gas-liquid separator 414 is provided on the other side of the three low-temperature compressors 411 and connected by pipelines, the low-temperature heat storage condenser 413 and the low-temperature gas-liquid separator 414 are all connected to the bottom bracket by screws, a four-way valve 415 is provided on the side of the low-temperature gas-liquid separator 414, the four-way valve 415 is connected to the bottom bracket by a bracket and screws, and the four ports on the four-way valve 415 are respectively connected to the low-temperature compressor 411, the cold storage condenser 413 and the cold storage condenser 414. The medium input pipe 23, the low-temperature thermal storage condenser 413, and the low-temperature gas-liquid separator 414 are connected by pipelines; the low-temperature compressor 411 is at least a scroll compressor, a rotary compressor, a piston compressor, a screw compressor, and a centrifugal compressor, and one or more thereof are used in combination; the low-temperature thermal storage condenser 413 is a shell and tube heat exchanger and a sleeve heat exchanger, and the heat exchanger of the low-temperature thermal storage condenser 413 does not have a liquid storage function inside but adopts a hollow design for filling with heat storage material. The heat storage material is at least a combination of paraffin, compound salt, hydrated salt and polyol, and the low-temperature gas-liquid separator 414 is connected in series with the low-temperature compressor 411 and the four-way valve 415 to form a small loop.

[0047] Combine Figure 9 As shown, the high-temperature circuit 42 includes a high-temperature compressor 421, which is connected to the bottom bracket by screws. A high-temperature condenser 422 is provided on one side of the high-temperature compressor 421 and is connected through a pipeline. An intermediate heat exchanger 423 is provided on the other side of the high-temperature compressor 421. The high-temperature condenser 422 and the intermediate heat exchanger 423 are both connected to the bottom bracket by screws. A high-temperature throttle valve 424 is provided between the intermediate heat exchanger 423 and the evaporator 2. The high-temperature throttle valve 424 is connected to the support frame by buckles and screws. A liquid reservoir 425 is provided on the side of the intermediate heat exchanger 423. Both ends of the high-temperature throttle valve 424 are connected to the refrigerant output The tube 22 and the liquid reservoir 425 are connected by a pipeline. A low-temperature throttle valve 416 is provided on the side of the liquid reservoir 425. One end of the low-temperature throttle valve 416 is connected to the evaporator 2 through a pipeline. The ports of the intermediate heat exchanger 423 are respectively connected to the high-temperature compressor 421, the low-temperature throttle valve 416, the low-temperature heat storage condenser 413, and the liquid reservoir 425 through pipelines; the high-temperature compressor 421 is of the same model as the low-temperature compressor 411, the high-temperature condenser 422 uses a shell and tube heat exchanger or a sleeve heat exchanger, and the low-temperature throttle valve 416 and the high-temperature throttle valve 424 use at least one or more of a thermal expansion valve, an electronic expansion valve and a capillary tube.

[0048] Combine Figure 10As shown, the vibration damping device 412 includes a connecting kit 4121, which is connected to the low-temperature compressor 411 via buckles and screws. Two mounting plates 4122 are provided below the connecting kit 4121. Several rubber vibration damping pads 4123 are provided between the mounting plates 4122 and the connecting kit 4121. The connecting kit 4121, the rubber vibration damping pads 4123, and the mounting plates 4122 are fastened together by screws. Several rubber vibration damping pads 4123 are also provided below the mounting plates 4122. The mounting plates 4122, the rubber vibration damping pads 4123, and the bottom bracket are fastened together by screws. The three low-temperature compressors 411 are connected to the mounting plates 4122. When one or two of the low-temperature compressors 411 are started up, vibration is transmitted to the mounting plates, causing the three low-temperature compressors 411, the connecting kit 4121, the rubber vibration damping pads 4123, and the connecting screws to vibrate regularly, thereby preventing some low-temperature compressors 411 from vibrating while the screws vibrate and causing the connection to loosen.

[0049] Working Principle: During use, in the normal heating mode, the refrigerant flows from the low-temperature stage thermal storage condenser 413 to the intermediate heat exchanger 423. When a large amount of ice and frost accumulate in the cold air in the evaporator 2, the heat pump enters the defrost mode, and the refrigerant flows from the intermediate heat exchanger 423 to the low-temperature stage thermal storage condenser 413. The heat transferred to the refrigerant through the high-temperature stage circuit 42 melts the frost outside the low-temperature stage circuit 41, thereby enhancing the defrosting efficiency of the cross-cascade heat pump system.

[0050] The rotatable fan module 52 at the bottom of the evaporator 2 is driven by a servo motor 55 to drive a gear set to achieve 0-80° angle adjustment. When the infrared sensor 33 detects that the temperature at the bottom of the fin condenser 21 has reached the freezing point, the main control system activates the fan module 52 to turn to the ice area, directional blowing the waste hot air generated by the operation of the heat exchanger unit 4. Combined with the heat transfer chamber 24 to provide auxiliary heat through solar energy, rapid ice melting is achieved.

[0051] The jet fans 7 on the sides of the multiple heat exchangers form a relay-type combined air duct. Under the synergistic effect of the cylindrical high-speed airflow, a large amount of deposited cold air generated in the large array heat exchanger unit is eliminated, avoiding the "cold island effect" caused by cold air deposition.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A heat exchanger for a two-stage cascade heat pump, comprising a chassis (1), wherein the chassis (1) is composed of a support frame, a bottom bracket, a protective plate, a top cover, a main control cabinet, and an evaporator (2), and is characterized in that: A top fan (3) is provided above the evaporator (2), a heat exchange unit (4) is provided below the evaporator (2), the heat exchange unit (4) comprises a low-temperature stage circuit (41) and a high-temperature stage circuit (42), de-icing mechanisms (5) are provided on both sides of the bottom of the evaporator (2), air supply mechanisms (6) are provided on both sides of the heat exchange unit (4), and a jet fan (7) is provided on the outside of the chassis (1); The de-icing mechanism (5) comprises two circular mounting frames (51), wherein a fan module (52) composed of a plurality of fans is provided inside the circular mounting frames (51), and wherein the fan module blows the hot air generated by the heat exchange unit directly to the part of the evaporator (2) that is prone to ice formation, thereby forming a de-icing effect and preventing a large amount of ice from affecting the heat exchange efficiency; The jet fan generates a strong cylindrical high-speed airflow, thereby blowing away the large amount of deposited cold air generated in the large array heat exchanger unit, avoiding the formation of a cold island effect that affects the heat exchange effect; The low-temperature circuit (41) includes a low-temperature compressor (411) installed in parallel, a low-temperature heat storage condenser (413) is provided on one side of the low-temperature compressor (411), and a low-temperature gas-liquid separator (414) is provided on the other side of the low-temperature compressor (411) and connected through a pipeline, a four-way valve (415) is provided on the side of the low-temperature gas-liquid separator (414), and four ports on the four-way valve (415) are respectively connected to the low-temperature compressor (411), the refrigerant input pipe (23), the low-temperature heat storage condenser (413), and the low-temperature gas-liquid separator (414) through pipelines; The high-temperature circuit (42) includes a high-temperature compressor (421), a high-temperature condenser (422) is provided on one side of the high-temperature compressor (421) and is connected via a pipeline, an intermediate heat exchanger (423) is provided on the other side of the high-temperature compressor (421), a high-temperature throttle valve (424) is provided between the intermediate heat exchanger (423) and the evaporator (2), a liquid reservoir (425) is provided on the side of the intermediate heat exchanger (423), and both ends of the high-temperature throttle valve (424) are provided. They are respectively connected to the refrigerant output pipe (22) and the liquid storage tank (425) through pipelines, a low-temperature throttle valve (416) is provided on the side of the liquid storage tank (425), one end of the low-temperature throttle valve (416) is connected to the evaporator (2) through a pipeline, and the ports of the intermediate heat exchanger (423) are respectively connected to the high-temperature compressor (421), the low-temperature throttle valve (416), the low-temperature heat storage condenser (413), and the liquid storage tank (425) through pipelines.

2. A heat exchanger for a two-stage cascade heat pump according to claim 1, characterized in that: The two sides of the two circular mounting frames (51) are respectively connected to the support frame and the evaporator (2) by screws, one end of the fan module (52) is provided with a C-shaped connecting piece (53), and one end of the fan module (52) is provided with a transmission mounting plate (54), the C-shaped connecting piece (53) and the transmission mounting plate (54) are both connected to the circular mounting frame (51) by screws, and the two ends of the fan module (52) are respectively connected to the C-shaped connecting piece (53) and the transmission mounting plate (54) by a rotating shaft.

3. A heat exchanger for a two-stage cascade heat pump according to claim 2, characterized in that: A servo motor (55) is installed on the top of the transmission mounting plate (54), and a driving gear (56) is installed on the output end of the servo motor (55). A driven gear (57) is installed on the outer side of the rotating shaft at one end of the fan module (52) and is meshed with the driving gear (56) for transmission. Dust covers are provided on the outer sides of the driving gear (56) and the driven gear (57). The dust covers are connected to the transmission mounting plate (54) by screws. The servo motor (55) is electrically connected to the main control cabinet.

4. A heat exchanger for a two-stage cascade heat pump according to claim 3, characterized in that: The air supply mechanism (6) includes a plate-shaped air supply box (61), the air supply box (61) is connected to the support frame by screws, a transfer box body (62) is installed on the side of one end of the air supply box (61), and a ventilation pipe (63) is installed on the side of the transfer box body (62). The air supply box (61), the transfer box body (62) and the ventilation pipe (63) are designed to be connected. A plurality of air guide plates (64) are fixed on the inside of the air supply box (61), and the air guide plates (64) are arranged at equal distances and are tilted in a trumpet shape. A plurality of ventilation openings (65) are penetrated on one side wall of the air supply box (61), and the ventilation openings (65) are located between two adjacent air guide plates (64) and are tilted in a trumpet shape. A vertical ventilation opening (66) is penetrated at the outermost end of the side wall of the air supply box (61), and the ventilation pipe (63) is connected to an external fan after penetrating the protective plate.

5. The heat exchanger for a two-stage cascade heat pump according to claim 4, characterized in that: The top sector (3) includes a fan mounting frame (31), the fan mounting frame (31) is connected to the top cover plate and the evaporator (2) by screws, a plurality of large fans (32) are installed inside the fan mounting frame (31), an infrared sensor (33) is installed at the bottom of the fan mounting frame (31), and the infrared sensor (33) is electrically connected to the main control cabinet.

6. The heat exchanger for a two-stage cascade heat pump according to claim 5, characterized in that: The evaporator (2) includes a pair of fin condensers (21), one end of the fin condenser (21) is provided with a refrigerant output pipe (22) and a refrigerant input pipe (23), the refrigerant output pipe (22) and the refrigerant input pipe (23) are both connected to the fin condenser (21), a heat conduction cavity (24) is provided at the bottom of the fin condenser (21) and is connected by screws, and a temperature sensor (25) is also installed on the evaporator (2).

7. The heat exchanger for a two-stage cascade heat pump according to claim 6, characterized in that: A plurality of heat dissipation holes (241) are provided on both sides of the heat conduction cavity (24), a heat conduction interface (242) is installed at one end of the heat conduction cavity (24), a heat energy adapter (243) is installed at the output end of the heat conduction interface (242), and a connecting pipe at the output end of the heat energy adapter (243) passes through the air supply box (61).

8. The heat exchanger for a two-stage cascade heat pump according to claim 7, characterized in that: A shock absorbing device (412) is provided between the three low-temperature compressors (411) and the bottom bracket and is connected via screws. The low-temperature heat storage condenser (413) and the low-temperature gas-liquid separator (414) are both connected to the bottom bracket via screws. The four-way valve (415) is connected to the bottom bracket via a bracket and screws.

9. The heat exchanger for a two-stage cascade heat pump according to claim 8, characterized in that: The high-temperature compressor (421) is connected to the bottom bracket via screws, the high-temperature condenser (422) and the intermediate heat exchanger (423) are both connected to the bottom bracket via screws, and the high-temperature throttle valve (424) is connected to the support frame via snaps and screws.

10. The heat exchanger for a two-stage cascade heat pump according to claim 9, characterized in that: The shock absorbing device (412) includes a connecting kit (4121), the connecting kit (4121) and the low-temperature compressor (411) are connected by means of buckles and screws, two mounting plates (4122) are provided below the connecting kit (4121), a plurality of rubber shock absorbing pads (4123) are provided between the mounting plates (4122) and the connecting kit (4121), the connecting kit (4121), the rubber shock absorbing pads (4123) and the mounting plate (4122) are fastened and connected by screws, a plurality of rubber shock absorbing pads (4123) are also provided below the mounting plate (4122), and the mounting plate (4122), the rubber shock absorbing pads (4123) and the bottom bracket are fastened and connected by screws.

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