Heating device and control method thereof
By setting shutters on the coupled heat exchanger of the heating equipment, controlling the air flow to realize the coupled operation of the low-temperature heat pump and the normal-temperature heat pump, the problems of low operating efficiency and safety at high ambient temperature in the existing technology are solved, and the operation efficiency in low temperature environments and safety at high ambient temperatures are achieved. High-efficiency heating below -50 degrees.
Patent Information
- Application Number
- CN202010705732.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-07-21
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2040-07-21
AI Technical Summary
Existing heating equipment operates in low-temperature environments and cannot operate safely and efficiently at high ambient temperatures. Especially the minimum operating temperature of the low-temperature side system is limited, which cannot effectively solve the operation problem of ambient temperature below -35 degrees.
By setting the first and second blinds on the coupled heat exchanger, controlling their opening and closing to detect air flow, the single-stage and double-stage coupling operation of the low-temperature heat pump and the normal temperature heat pump are realized, and heat exchange is performed using fins The device completes the coupling heat exchange between the low temperature and the room temperature side, uses low temperature refrigerant on the low temperature side, uses room temperature refrigerant on the room temperature side, and evaporator introduces external air for heat exchange.
The single-stage and two-stage coupled operation of heat pump heating equipment in ultra-low temperature environments is realized, ensuring safe and efficient operation of the equipment at low temperature and high ambient temperatures. The minimum working temperature on the low temperature side reaches -50 degrees, improving the energy efficiency ratio of the system.
Smart Images
Figure CN111720883B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a heating unit, in particular to heating equipment and a control method thereof. Background Art
[0002] On the one hand, the common existing heating equipment relies on switching whether the water at the heating end flows to the evaporator of the water source heat pump at the normal temperature side, or flows directly to the heating end, to achieve single-stage and double-stage coupled operation (with water as the coupled heat exchange medium) according to the change of ambient temperature, so as to ensure system problems and energy-saving needs. However, the low-temperature side system (low-temperature heat pump device) of this method cannot use low-temperature refrigerant, resulting in the minimum operating temperature of the system being limited (ambient temperature needs to be >-35 degrees).
[0003] On the other hand, in order to solve the above problems, the existing refrigerant is directly coupled, and the low-temperature side (low-temperature heat pump device) uses low-temperature refrigerant, and the normal temperature side (normal temperature heat pump device) uses normal temperature refrigerant. Although this solves the low-temperature operating temperature limitation, it cannot solve the safe operation of the normal temperature side of the unit and the high-efficiency operation of the system when the ambient temperature is high (generally greater than -5 degrees).
[0004] In addition, the existing two-stage compression technology solves the compression ratio problem, but a single refrigerant still cannot solve the problem of operation at ambient temperatures below -35 degrees. At the same time, in order to meet the higher ambient temperature operation, the unit's operating efficiency is low. Summary of the invention
[0005] The purpose of the present invention is to provide a heating device that can realize single-stage and double-stage coupled operation of a heat pump heating device in an ultra-low temperature environment by opening or closing a first louver and a second louver to detect whether air flows through a coupled heat exchanger for ventilation; effectively solve the problem of low energy efficiency of the unit under operation at a higher ambient temperature, so as to overcome the shortcomings of the prior art.
[0006] A heating device designed for this purpose includes a low-temperature heat pump device and a normal-temperature heat pump device. A coupling device with the ability to exchange heat with air is arranged between the low-temperature heat pump device and the normal-temperature heat pump device. The coupling device with the ability to exchange heat with air includes a coupling area sealed left and right or up and down. A coupling heat exchanger is arranged in the coupling area. The coupling heat exchanger is at least a tube-fin heat exchanger. The coupling heat exchanger is provided with a first louver and a second louver in the upper and lower directions or in the left and right directions. An evaporating fan is arranged above the first louver in the coupling area. The low-temperature heat pump device is provided with an air outlet and a liquid inlet, and the gas-liquid flow path of the low-temperature heat pump device and the gas-liquid flow path of the normal-temperature heat pump device are respectively connected to the coupling heat exchanger through pipelines. By closing the first louver and the second louver, the coupling area is completely sealed to complete the low-temperature heat pump device and the normal-temperature heat pump device. The coupled heat exchange between the high-temperature heat pump devices is completed by heat conduction through the fins of the tube-fin heat exchanger, and the low-temperature heat pump device and the normal-temperature heat pump device operate at the same time to complete the heating function of the low-temperature heat pump device in an ultra-low temperature environment; open and control the first louver and the second louver, the low-temperature heat pump device does not operate, the normal-temperature heat pump device operates, and the evaporating fan operates, the evaporating fan draws the external ambient air, and the air enters the second louver, the coupled heat exchanger, and the first louver from top to bottom in turn; or, the air enters the first louver, the coupled heat exchanger, and the second louver from left to right in turn, to achieve heat exchange between the normal-temperature heat pump system and the ambient air through the coupled heat exchanger, and the normal-temperature heat pump device operates alone; by controlling whether air flows through the coupled heat exchanger, single-stage and double-stage coupled operation of the heat pump heating equipment in an ultra-low temperature environment can be achieved.
[0007] The coupling heat exchanger is arranged in a tilted, horizontal or vertical manner in the coupling zone; the coupling zone is provided with heat preservation plates on the upper, lower or left and right outer sides of the coupling heat exchanger.
[0008] The temperature of the ultra-low temperature environment is -20°C to -60°C; the first and second venetian blinds are hollow inside and filled with insulation materials respectively, or the first and second venetian blinds are both covered with 2 to 20 mm insulation materials on the outer surfaces.
[0009] The low-temperature heat pump device comprises a first evaporator, a first compressor, a first gas-liquid separator and a first heat recovery heat exchanger connected by pipelines; a low-temperature side fan is arranged above the first evaporator.
[0010] The coupled heat exchanger is provided with a first air inlet and a first air outlet that are connected to each other, the first compressor is provided with a first exhaust port, and a first four-way valve is provided between the first exhaust port and the first air inlet; the first four-way valve is provided with a first upper joint and a first lower joint, the first exhaust port and the first upper joint are connected by a pipeline, and the first air inlet and the first lower joint are connected by a pipeline; the normal temperature heat pump device includes a second compressor and a main heat exchanger, a second gas-liquid separator and a second heat recovery heat exchanger that are connected by pipelines, a second four-way valve is provided between the second compressor and the main heat exchanger, the second compressor is provided with a second exhaust port, the main heat exchanger is provided with a second air inlet, the second four-way valve is provided with a second upper joint, a second lower joint and a third lower joint, and the second upper joint and the second exhaust port are connected by a pipeline; the third lower joint and the second air inlet are connected by a pipeline, and the first air outlet and the second lower joint are connected by a pipeline.
[0011] The first evaporator is provided with a second air outlet, and the first four-way valve is also provided with a fourth lower joint and a fifth lower joint, and the fourth lower joint and the second air outlet are connected by a pipeline; the first compressor is also provided with a first return air port and a first air supply port, the first gas-liquid separator is provided with a third air outlet and a third air inlet, and the fifth lower joint and the third air inlet are connected by a pipeline; the first return air port and the third air outlet are connected by a pipeline; the first heat recovery heat exchanger is provided with a first liquid inlet and a fourth air outlet that are connected, and the coupling heat exchanger is also provided with a first liquid outlet and a second liquid inlet that are connected, and the first liquid outlet and the first liquid inlet are connected by a pipeline; the fourth air outlet and the first air supply port are connected by a pipeline.
[0012] The first evaporator is also provided with a third liquid inlet, and the first heat recovery heat exchanger is also provided with a fourth air inlet and a second liquid outlet which are connected to each other; a first main throttle valve is provided between the third liquid inlet and the second liquid outlet, the third liquid inlet, the second liquid outlet and the first main throttle valve are connected by a pipeline, and the pipeline between the three is extended and connected with a first air supply throttle valve, and the first air supply throttle valve and the fourth air inlet are connected by a pipeline.
[0013] The main heat exchanger is provided with a fifth air outlet, the second compressor is provided with a second air supply port, the second heat recovery heat exchanger is provided with a fourth liquid inlet and a sixth air outlet which are connected to each other, and the fifth air outlet and the fourth liquid inlet are connected by a pipeline; the sixth air outlet and the second air supply port are connected by a pipeline; the second heat recovery heat exchanger is provided with a fifth air inlet and a third liquid outlet which are also connected to each other, a second main throttle valve is provided between the third liquid outlet and the second liquid inlet, and the three are connected by a pipeline; a second air supply throttle valve is extended to the pipeline between the second main throttle valve and the third liquid outlet, and the second air supply throttle valve and the fifth air inlet are connected by a pipeline.
[0014] The second compressor is provided with a second air return port, the second gas-liquid separator is provided with a sixth air inlet and a seventh air outlet, the second four-way valve is provided with a sixth lower joint, the sixth lower joint and the sixth air inlet are connected by a pipeline, and the second air return port and the seventh air outlet are connected by a pipeline.
[0015] A control method for a heating device includes the above-mentioned heating device, and the control method is: by opening or closing a first louver and a second louver to detect whether air flows through a coupled heat exchanger during ventilation, single-stage and double-stage coupled operation of a heat pump heating device in an ultra-low temperature environment is achieved; during double-stage coupled operation, a low-temperature heat pump device and a normal-temperature heat pump device operate simultaneously, the first louver and the second louver are closed, and an evaporating fan does not operate; during single-stage coupled operation, the first louver and the second louver are opened, the evaporating fan operates, and when the low-temperature heat pump device does not operate, the normal-temperature heat pump device operates alone.
[0016] The beneficial effects of the present invention are as follows:
[0017] The present invention opens or closes the first shutter and the second shutter to detect whether air flows through the coupled heat exchanger for ventilation, thereby realizing single-stage and double-stage coupled operation of the heat pump heating equipment in an ultra-low temperature environment; it effectively solves the problem that the low-temperature heat pump device in the prior art can use low-temperature refrigerant, and the normal-temperature heat pump device uses normal-temperature refrigerant, thereby ensuring that the equipment can operate safely and efficiently in a low-temperature environment and in a high-temperature environment.
[0018] The present invention relies on the fins of the fin heat exchanger as a two-stage coupled heat exchanger. During two-stage operation, the fin heat conduction is used to complete the coupling of the low-temperature side (low-temperature heat pump device) and the normal temperature side refrigeration system (normal temperature heat pump device). During single-stage operation, the evaporating fan is started to introduce ambient air into the fin heat exchanger to complete the heat exchange between the refrigerant and the air in the evaporator of the normal temperature side refrigeration system (normal temperature heat pump device). In this way, the low-temperature side refrigeration system (low-temperature heat pump device) can use low-temperature refrigerant, so that the minimum working environment temperature of the unit reaches -50, and the normal temperature side refrigeration system (normal temperature heat pump device) uses commonly used normal temperature refrigerant, ensuring the system safety and high energy efficiency ratio operation of the unit when the ambient temperature is high. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic structural diagram of the double-stage coupling operation of the heating equipment according to the first embodiment of the present invention.
[0020] Figure 2 It is a schematic structural diagram of a low-temperature heat pump device according to a first embodiment of the present invention.
[0021] Figure 3 It is a schematic structural diagram of the coupling device opening the shutters according to the first embodiment of the present invention.
[0022] Figure 4It is a schematic structural diagram of a normal temperature heat pump device according to the first embodiment of the present invention.
[0023] Figure 5 This is a schematic structural diagram of the single-stage coupling operation of the heating equipment according to the first embodiment of the present invention.
[0024] Figure 6 It is a schematic structural diagram of a coupling device for closing a shutter according to the first embodiment of the present invention.
[0025] Figure 7 It is a schematic structural diagram of the coupling device of the second embodiment of the present invention for opening the shutters.
[0026] Figure 8 It is a schematic structural diagram of a coupling device for closing shutters according to the second embodiment of the present invention. DETAILED DESCRIPTION
[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0028] First embodiment
[0029] See also Figure 1 A heating device includes a low-temperature heat pump device 1 and a normal-temperature heat pump device 2. A coupling device 3 with air heat exchange capability is provided between the low-temperature heat pump device 1 and the normal-temperature heat pump device 2.
[0030] See also Figure 3 The coupling device 3 with the ability to exchange heat with air includes a coupling area sealed left and right or up and down, and a coupling heat exchanger 3.1 is arranged in the coupling area. The coupling heat exchanger 3.1 is at least a tube-fin heat exchanger. The coupling heat exchanger 3.1 is provided with a first louver 3.2 and a second louver 3.3 on its upper and lower sides. The coupling heat exchanger 3.1 is between the first louver 3.2 and the second louver 3.3, and an evaporating fan 3.4 is arranged above the first louver 3.2 in the coupling area; the low-temperature heat pump device 1 is provided with an air outlet and a liquid inlet, and the gas-liquid flow path of the low-temperature heat pump device 1 and the gas-liquid flow path of the normal temperature heat pump device 2 are respectively connected to the coupling heat exchanger 3.1 through pipelines.
[0031] See also Figure 1 By closing the first shutter 3.2 and the second shutter 3.3, the coupling area is completely sealed to complete the coupling heat exchange between the low-temperature heat pump device 1 and the normal-temperature heat pump device 2 through the fin heat conduction of the tube-fin heat exchanger, and the low-temperature heat pump device 1 and the normal-temperature heat pump device 2 are operated at the same time to complete the heating function of the low-temperature heat pump device 1 in an ultra-low temperature environment.
[0032] See also Figure 5 , Figure 6, open and control the first louver 3.2 and the second louver 3.3, the low-temperature heat pump device 1 does not operate, the normal-temperature heat pump device 2 operates, and the evaporating fan 3.4 operates. The evaporating fan 3.4 draws the external ambient air, and the air enters the second louver 3.3, the coupling heat exchanger 3.1, and the first louver 3.2 from top to bottom in sequence, so that the normal-temperature heat pump system 2 exchanges heat with the ambient air through the coupling heat exchanger 3.1, and the normal-temperature heat pump device 2 operates alone; by controlling whether air flows through the coupling heat exchanger 3.1, the single-stage and double-stage coupled operation of the heat pump heating equipment in an ultra-low temperature environment can be realized.
[0033] The coupling heat exchanger 3.1 is disposed transversely in the coupling zone; the coupling zone is provided with insulation plates 3.5 on the upper and lower outer sides of the coupling heat exchanger 3.1, respectively, so that the coupling zone has an insulation effect.
[0034] The temperature of the ultra-low temperature environment is -20℃ to -60℃.
[0035] In order to make the first venetian blind 3.2 and the second venetian blind 3.3 have good heat preservation effect, the first venetian blind 3.2 and the second venetian blind 3.3 are hollow inside and filled with heat preservation materials, or the first venetian blind 3.2 and the second venetian blind 3.3 are both covered with 2 to 20 mm of heat preservation materials on the outer surface side. The above-mentioned heat preservation materials are prior art in the industry. In this embodiment, the above-mentioned prior art heat preservation materials are directly arranged on the first venetian blind 3.2 and the second venetian blind 3.3, so the manufacture of the heat preservation materials is not described in detail.
[0036] See also Figure 2 The low-temperature heat pump device 1 includes a first evaporator 4, a first compressor 5, a first gas-liquid separator 6 and a first heat recovery heat exchanger 7 connected by pipelines; a low-temperature side fan 14 is provided above the first evaporator 4.
[0037] See also Figure 2 , Figure 3 , Figure 4The coupled heat exchanger 3.1 is provided with a first air inlet 3.6 and a first air outlet 3.8 which are connected to each other. The first compressor 5 is provided with a first exhaust port 5.1. A first four-way valve 8 is provided between the first exhaust port 5.1 and the first air inlet 3.6. The first four-way valve 8 is provided with a first upper joint 8.1 and a first lower joint 8.2. The first exhaust port 5.1 and the first upper joint 8.1 are connected by a pipeline. The first air inlet 3.6 and the first lower joint 8.2 are connected by a pipeline. The normal temperature heat pump device 2 includes a second compressor 9 and a main heat exchanger 10 connected by pipelines, and a second gas-liquid separator. 11 and a second heat recovery heat exchanger 12, a second four-way valve 13 is provided between the second compressor 9 and the main heat exchanger 10, the second compressor 9 is provided with a second exhaust port 9.1, the main heat exchanger 10 is provided with a second air inlet 10.1, the second four-way valve 13 is provided with a second upper joint 13.1, a second lower joint 13.2 and a third lower joint 13.3, the second upper joint 13.1 and the second exhaust port 9.1 are connected by a pipeline; the third lower joint 13.3 and the second air inlet 10.1 are connected by a pipeline, and the first air outlet 3.8 and the second lower joint 13.2 are connected by a pipeline.
[0038] The first evaporator 4 is provided with a second air outlet 4.1, and the first four-way valve 8 is further provided with a fourth lower joint 8.3 and a fifth lower joint 8.4, and the fourth lower joint 8.3 is connected to the second air outlet 4.1 through a pipeline; the first compressor 5 is further provided with a first air return port 5.2 and a first air supply port 5.3, the first gas-liquid separator 6 is provided with a third air outlet 6.2 and a third air inlet 6.1, and the fifth lower joint 8.4 is connected to the third air inlet 6.1 through a pipeline; the first air return port 5.2 is connected to the third air outlet 6.2 through a pipeline; the first heat recovery heat exchanger 7 is provided with a first liquid inlet 7.1 and a fourth air outlet 7.2 that are connected, and the coupling heat exchanger 3.1 is further provided with a first liquid outlet 3.7 and a second liquid inlet 3.9 that are connected, and the first liquid outlet 3.7 and the first liquid inlet 7.1 are connected through a pipeline; the fourth air outlet 7.2 is connected to the first air supply port 5.3 through a pipeline.
[0039] The first evaporator 4 is also provided with a third liquid inlet 4.2, and the first heat recovery heat exchanger 7 is also provided with a fourth air inlet 7.3 and a second liquid outlet 7.4 which are connected to each other; a first main throttle valve 15 is provided between the third liquid inlet 4.2 and the second liquid outlet 7.4, the third liquid inlet 4.2, the second liquid outlet 7.4 and the first main throttle valve 15 are connected by a pipeline, and the pipeline between the three is extended to be connected with a first air supply throttle valve 16, and the first air supply throttle valve 16 and the fourth air inlet 7.3 are connected by a pipeline.
[0040] The main heat exchanger 10 is provided with a fifth air outlet 10.2, the second compressor 9 is provided with a second air supply port 9.2, the second heat recovery heat exchanger 12 is provided with a fourth liquid inlet 12.1 and a sixth air outlet 12.2 which are connected to each other, the fifth air outlet 10.2 and the fourth liquid inlet 12.1 are connected by a pipeline; the sixth air outlet 12.2 and the second air supply port 9.2 are connected by a pipeline; the second heat recovery heat exchanger 12 is provided with a fifth air inlet 12.4 and a third liquid outlet 12.3 which are also connected to each other, a second main throttle valve 17 is provided between the third liquid outlet 12.3 and the second liquid inlet 3.9, and the three are connected by a pipeline; a second air supply throttle valve 18 is provided on the pipeline extending between the second main throttle valve 17 and the third liquid outlet 12.3, and the second air supply throttle valve 18 and the fifth air inlet 12.4 are connected by a pipeline.
[0041] The second compressor 9 is provided with a second air return port 9.3, the second gas-liquid separator 11 is provided with a sixth air inlet 11.1 and a seventh air outlet 11.2, the second four-way valve 13 is provided with a sixth lower connector 13.4, the sixth lower connector 13.4 and the sixth air inlet 11.1 are connected by a pipeline, and the second air return port 9.3 and the seventh air outlet 11.2 are connected by a pipeline.
[0042] Specifically: during the two-stage coupling operation, the low-temperature heat pump device 1 and the normal-temperature heat pump device 2 operate simultaneously, and the first louver 3.2 and the second louver 3.3 are closed, and the coupling area is in a completely sealed state; the first compressor 5 exhausts gas, and the gas enters the coupling heat exchanger 3.1 (condenser) through the first exhaust port 5.1 and the first four-way valve 8, and the gas condenses and becomes liquid. The liquid enters the first heat recovery heat exchanger 7 for supercooling, and then enters the first main throttle valve 15 for throttling, and then enters the first evaporator 4 through the third liquid inlet 4.2, and evaporates to become gas by absorbing heat from the air. For example, when the ambient air enters the first evaporator 4 at -30°C, the liquid absorbs heat to cool the air to -36°C, and then is discharged to the outside environment through the low-temperature side fan 14. At the same time, the cooled gas enters the first gas-liquid separator 6 through the first four-way valve 8. After gas-liquid separation, the first gas-liquid separator 6 returns to the first compressor 5 through the first return air port 5.2.
[0043] Before the first heat recovery heat exchanger 7 is throttled, the first heat recovery heat exchanger 7 evaporates the liquid into gas, and the gas enters the first compressor 5 through the first gas supply port 5.3.
[0044] The air in the coupling zone (eg 10°C) passes through the coupling heat exchanger 3.1 and is heated by the coupling heat exchanger 3.1, and the air temperature rises to 16°C.
[0045] Similarly, the working principles of the second compressor 9, the second gas-liquid separator 11, etc. of the normal temperature heat pump device 2 are the same as those of the low temperature heat pump device 1, and will not be described in detail here.
[0046] The control method of the above-mentioned heating equipment includes the above-mentioned heating equipment, and its control method is: by opening or closing the first louver 3.2 and the second louver 3.3 to detect whether there is air flowing through the coupling heat exchanger 3.1 during ventilation, to achieve single-stage and double-stage coupling operation of the heat pump heating equipment in an ultra-low temperature environment; when the two-stage coupling operation is in progress, the low-temperature heat pump device 1 and the normal temperature heat pump device 2 are operated simultaneously, the first louver 3.2 and the second louver 3.3 are closed, and the evaporating fan 3.4 is not operated; when the single-stage coupling operation is in progress, the first louver 3.2 and the second louver 3.3 are opened, the evaporating fan 3.4 is operated, and when the low-temperature heat pump device 1 is not operated, the normal temperature heat pump device 2 is operated alone.
[0047] Second embodiment
[0048] See also Figure 7 , Figure 8 A heating device is different from the first embodiment in that: a coupling heat exchanger 3.1 is provided with a first louver 3.2 and a second louver 3.3 on its left and right directions, and the first louver 3.2 and the second louver 3.3 are opened and controlled, the low-temperature heat pump device 1 does not operate, the normal temperature heat pump device 2 operates, and the evaporating fan 3.4 operates. The evaporating fan 3.4 draws the external ambient air, and the air enters the first louver 3.2, the coupling heat exchanger 3.1, and the second louver 3.3 from left to right in sequence, so that the normal temperature heat pump system 2 exchanges heat with the ambient air through the coupling heat exchanger 3.1, and the normal temperature heat pump device 2 operates alone; by controlling whether air flows through the coupling heat exchanger 3.1, the single-stage and double-stage coupled operation of the heat pump heating device in an ultra-low temperature environment can be realized.
[0049] The coupling heat exchanger 3.1 is arranged obliquely in the coupling area.
[0050] The inclined angle between the first louver 3.2 or the second louver 3.3 and the evaporation fan 3.4 is 20°-25°.
[0051] In the coupling zone, insulation plates 3.5 are provided on the upper and lower outer sides of the coupling heat exchanger 3.1 respectively.
[0052] Other undescribed parts are the same as those in the first embodiment and will not be described in detail here.
[0053] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.
Claims
1. A heating device, comprising a low-temperature heat pump device (1) and a normal-temperature heat pump device (2), Features: A coupling device (3) having the ability to exchange heat with air is provided between the low-temperature heat pump device (1) and the normal-temperature heat pump device (2). The coupling device (3) having the ability to exchange heat with air comprises a left-right or top-bottom sealed coupling area. A coupling heat exchanger (3.1) is provided in the coupling area. The coupling heat exchanger (3.1) is at least a tube-fin heat exchanger. The coupling heat exchanger (3.1) is provided with a first louver (3.2) and a second louver (3.3) in the upper and lower or left and right directions. The coupling area is provided with a first louver (3.2) and a second louver (3.3) in the first and second directions. An evaporating fan (3.4) is provided above the louver (3.2); the low-temperature heat pump device (1) is provided with an air outlet and a liquid inlet, and the gas-liquid flow path of the low-temperature heat pump device (1) and the gas-liquid flow path of the normal-temperature heat pump device (2) are respectively connected to the coupling heat exchanger (3.1) through pipelines; by closing the first louver (3.2) and the second louver (3.3), the coupling area is in a completely sealed state, so as to complete the fin-to-fin heat exchange between the low-temperature heat pump device (1) and the normal-temperature heat pump device (2) through the fin-to-tube heat exchanger. The heat transfer of the plate is completed by coupling heat exchange, and the low-temperature heat pump device (1) and the normal-temperature heat pump device (2) are operated simultaneously, completing the heating function of the low-temperature heat pump device (1) in an ultra-low-temperature environment; the first louver (3.2) and the second louver (3.3) are controlled to be opened, the low-temperature heat pump device (1) is not operated, the normal-temperature heat pump device (2) is operated, and the evaporating fan (3.4) is operated, and the evaporating fan (3.4) draws the external environment air, and the air enters the second louver (3.3), the coupling fan (3.4) and the coupling fan (3.4) in sequence from top to bottom. The coupling heat exchanger (3.1) and the first louver (3.2) are connected to the coupling heat exchanger (3.1), and the first louver (3.2); or, air enters the first louver (3.2), the coupling heat exchanger (3.1), and the second louver (3.3) in sequence from left to right, so that the normal temperature heat pump device (2) exchanges heat with ambient air through the coupling heat exchanger (3.1), and the normal temperature heat pump device (2) operates alone; and single-stage and double-stage coupling operation of the heat pump heating device in an ultra-low temperature environment is achieved by controlling whether air flows through the coupling heat exchanger (3.1); The temperature of the ultra-low temperature environment is -20°C to -60°C; the first louver (3.2) and the second louver (3.3) are hollow inside and are filled with heat-insulating materials, or the outer surfaces of the first louver (3.2) and the second louver (3.3) are both covered with 2 to 20 mm of heat-insulating materials; The low-temperature heat pump device (1) comprises a first evaporator (4), a first compressor (5), a first gas-liquid separator (6) and a first heat recovery heat exchanger (7) connected by pipelines; a low-temperature side fan (14) is provided above the first evaporator (4); The coupled heat exchanger (3.1) is provided with a first air inlet (3.6) and a first air outlet (3.8) which are connected to each other; the first compressor (5) is provided with a first exhaust port (5.1); a first four-way valve (8) is provided between the first exhaust port (5.1) and the first air inlet (3.6); the first four-way valve (8) is provided with a first upper joint (8.1) and a first lower joint (8.2); the first exhaust port (5.1) and the first upper joint (8.1) are connected via a pipeline; the first air inlet (3.6) and the first lower joint (8.2) are connected via a pipeline; the normal temperature heat pump device (2) comprises a second compressor (9) and a main heat exchanger (10), a second gas-liquid separator ( 11 and a second heat recovery heat exchanger (12), a second four-way valve (13) is provided between the second compressor (9) and the main heat exchanger (10), the second compressor (9) is provided with a second exhaust port (9.1), the main heat exchanger (10) is provided with a second air inlet (10.1), the second four-way valve (13) is provided with a second upper joint (13.1), a second lower joint (13.2) and a third lower joint (13.3), the second upper joint (13.1) and the second exhaust port (9.1) are connected via a pipeline; the third lower joint (13.3) and the second air inlet (10.1) are connected via a pipeline, and the first air outlet (3.8) and the second lower joint (13.2) are connected via a pipeline.
2. The heating device according to claim 1, Features: The coupling heat exchanger (3.1) is arranged in a tilted, horizontal or vertical manner in the coupling zone; the coupling zone is provided with insulation plates (3.5) on the upper, lower or left and right outer sides of the coupling heat exchanger (3.1).
3. The heating device according to claim 1, Features: The first evaporator (4) is provided with a second air outlet (4.1), the first four-way valve (8) is further provided with a fourth lower joint (8.3) and a fifth lower joint (8.4), and the fourth lower joint (8.3) and the second air outlet (4.1) are connected via a pipeline; the first compressor (5) is further provided with a first air return port (5.2) and a first air supply port (5.3), the first gas-liquid separator (6) is provided with a third air outlet (6.2) and a third air inlet (6.1), and the fifth lower joint (8.4) and the third air inlet (6.1) are connected via a pipeline. ) are connected by a pipeline; the first air return port (5.2) and the third air outlet (6.2) are connected by a pipeline; the first heat recovery heat exchanger (7) is provided with a first liquid inlet (7.1) and a fourth air outlet (7.2) which are connected to each other, and the coupling heat exchanger (3.1) is also provided with a first liquid outlet (3.7) and a second liquid inlet (3.9) which are connected to each other, and the first liquid outlet (3.7) and the first liquid inlet (7.1) are connected by a pipeline; the fourth air outlet (7.2) and the first air replenishment port (5.3) are connected by a pipeline.
4. The heating device according to claim 3, Features: The first evaporator (4) is further provided with a third liquid inlet (4.2), and the first heat recovery heat exchanger (7) is further provided with a fourth air inlet (7.3) and a second liquid outlet (7.4) which are connected to each other; a first main throttle valve (15) is provided between the third liquid inlet (4.2) and the second liquid outlet (7.4); the third liquid inlet (4.2), the second liquid outlet (7.4) and the first main throttle valve (15) are connected via a pipeline, and the pipeline between the three is extended to be connected with a first air supply throttle valve (16); and the first air supply throttle valve (16) and the fourth air inlet (7.3) are connected via a pipeline.
5. The heating device according to claim 3, Features: The main heat exchanger (10) is provided with a fifth air outlet (10.2), the second compressor (9) is provided with a second air supply port (9.2), the second heat recovery heat exchanger (12) is provided with a fourth liquid inlet (12.1) and a sixth air outlet (12.2) which are connected to each other, the fifth air outlet (10.2) and the fourth liquid inlet (12.1) are connected via a pipeline; the sixth air outlet (12.2) and the second air supply port (9.2) are connected via a pipeline; the second heat recovery heat exchanger ( 12) is also provided with a fifth air inlet (12.4) and a third liquid outlet (12.3) which are connected to each other; a second main throttle valve (17) is provided between the third liquid outlet (12.3) and the second liquid inlet (3.9), and the three are connected by a pipeline; a second air supply throttle valve (18) is provided in the pipeline extending between the second main throttle valve (17) and the third liquid outlet (12.3), and the second air supply throttle valve (18) and the fifth air inlet (12.4) are connected by a pipeline.
6. The heating device according to claim 1, Features: The second compressor (9) is provided with a second air return port (9.3), the second gas-liquid separator (11) is provided with a sixth air inlet (11.1) and a seventh air outlet (11.2), the second four-way valve (13) is provided with a sixth lower connector (13.4), the sixth lower connector (13.4) and the sixth air inlet (11.1) are connected via a pipeline, and the second air return port (9.3) and the seventh air outlet (11.2) are connected via a pipeline.
7. A method for controlling a heating device, comprising the heating device according to claim 1, Features: The control method comprises: opening or closing the first louver (3.2) and the second louver (3.3) to detect whether air is flowing through the coupling heat exchanger (3.1) during ventilation, thereby realizing single-stage and double-stage coupling operation of the heat pump heating equipment in an ultra-low temperature environment; when the double-stage coupling operation is in progress, the low-temperature heat pump device (1) and the normal-temperature heat pump device (2) are operated simultaneously, the first louver (3.2) and the second louver (3.3) are closed, and the evaporation fan (3.4) is not operated; when the single-stage coupling operation is in progress, the first louver (3.2) and the second louver (3.3) are opened, the evaporation fan (3.4) is operated, and when the low-temperature heat pump device (1) is not operated, the normal-temperature heat pump device (2) is operated alone.