Active and passive heat dissipation integrated system based on pressure difference adaptive matching working medium and control method thereof

Abstract

The application discloses a main and passive heat dissipation integrated system based on pressure difference self-adaptive matching working medium, a main pipeline of which comprises a closed cycle composed of a compressor, a condenser, a throttling element and an evaporator, a first bypass connected in parallel with the throttling element and a second bypass connected in parallel with the compressor; the integrated system further comprises a controller capable of selectively closing and starting the first bypass and the second bypass, so that the integrated system switches between the compressor mode and the heat pipe mode; the integrated system further comprises a liquid storage branch comprising a liquid storage tank and a valve unit, the liquid storage branch being connected with an outlet of the condenser, the liquid storage tank being installed on a liquid storage branch interface of the main pipeline through the valve unit; the controller is capable of controlling the valve unit to open and close, so that the liquid storage tank can store working medium inward or release working medium outward according to working medium pressure in the main pipeline in the compressor mode and the heat pipe mode, so that the working medium of the integrated system is adapted to the compressor mode and the heat pipe mode in the state of the optimal filling rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular, it relates to the combined unit of the gravity type heat pipe and air conditioner, specifically, it is the active and passive heat dissipation integrated system based on pressure difference self-adaptive matching working medium, and it relates to the corresponding control method. BACKGROUND

[0002] Active heat transfer refers to the heat transfer of a non-spontaneous refrigeration cycle. Taking air conditioner as an example, the working principle of air conditioner compressor is vapor compression type refrigeration cycle, and its core task is to suck low-pressure low-temperature refrigerant gas, and then compress it into high-pressure high-temperature gas through mechanical movement. This process enables the refrigerant to release more heat and provides power for the refrigeration cycle.

[0003] More specifically, the working of air conditioner compressor can be divided into four steps: adiabatic compression, condensation, throttling and evaporation. In the adiabatic compression stage, electric energy does mechanical work, and the refrigerant is compressed in the compressor, at this time the temperature of the refrigerant rises, and the pressure rises. Then, the high-temperature high-pressure gaseous refrigerant enters the condenser to release heat, changes from gas to liquid, and becomes high-pressure liquid refrigerant. Next, after throttling through the expansion valve or the throttle valve, the refrigerant becomes low-pressure low-temperature liquid or gas-liquid two-phase state. Finally, the refrigerant enters the evaporator to absorb heat and evaporate, thereby cooling the surrounding air or water.

[0004] This process is a non-spontaneous refrigeration cycle, which makes the heat transfer from low-temperature object to high-temperature object. In general, when the air conditioner compressor works, it continuously absorbs the heat at one end of the low-pressure area into the refrigerant and sends it to the high-pressure area to be distributed to the air, thereby continuously adjusting the temperature.

[0005] Corresponding to active heat transfer is passive heat transfer, such as heat pipe system, which is a passive heat management system, and its working principle is mainly based on physical phenomena such as heat conduction and rapid heat transfer properties of liquid. It makes full use of the principle of heat conduction and the rapid heat transfer properties of refrigerant, and quickly transfers the heat of the heat generating object to the heat source through the heat pipe, and its heat conduction capacity even exceeds that of any known metal. The gravity heat pipe is essentially a closed pipe, one end of which is heated and the other end is cooled, and the working fluid is filled in the closed pipe. When one end of the pipe is heated, the liquid will evaporate into gas after absorbing heat. The saturated vapor will flow to the cold end, condense and release heat at the cold end. Then, the condensed liquid returns to the hot end under the action of gravity, absorbs heat and vaporizes again. In this way, the heat is continuously transferred from the heat source to the cold source.

[0006] At present, the number of base stations, cabinets and shelters increases year by year, and a large number of heat generating equipment needs to be cooled all year round. If the cooling is completely relied on the air conditioning system, the air conditioning compressor needs to run for a long time, and the energy consumption is large. In order to realize the energy saving and emission reduction of the air conditioning system at present, in addition to improving the energy efficiency ratio of the air conditioning system itself, it is to reduce the running time of the air conditioning compressor and try to use natural cold source, so that the refrigeration system combined with air conditioning mode and heat pipe mode appears.

[0007] For example, Chinese invention patent CN105423656A proposes a refrigeration system and its control method. It is connected between the gas inlet and the exhaust port of the compressor for selectively bypassing the compressor. At the same time, a throttling device bypass pipeline is arranged between the first port and the second port of the throttling device for selectively bypassing the throttling device, and a refrigerant pump is arranged between the condenser and the throttling device. At the same time, a refrigerant pump bypass pipeline is connected between the first pump port and the second pump port of the refrigerant pump for selectively bypassing the refrigerant pump. Thus, the refrigeration system can select different refrigerant flow paths to work at different environmental temperatures to maximize the use of natural cold source, thereby realizing efficient operation of the refrigeration system and greatly reducing the energy consumption of the refrigeration system.

[0008] But the liquid filling rate of the air conditioning system working in the heat pipe system mode is very different from that working in the compressor mode. Generally speaking, the best working quality required by the heat pipe system mode is 1-2 times that of the compressor mode, so direct mode switching will cause the two systems to be unable to operate at the best working point. In CN105423656A, the refrigeration system further includes a liquid accumulator connected in series between the condenser and the refrigerant pump. One end of the liquid accumulator is connected to the second condensing opening of the condenser, and the other end of the liquid accumulator is connected to the first pump port of the refrigerant pump and the first end of the refrigerant pump bypass pipeline. The liquid accumulator is used to store refrigerant for the circulating loop. It can be said that the use of the liquid accumulator can act as a buffer element for the working medium, adjusting the working quality in the entire refrigeration circulating pipeline to enable normal conversion. However, the existing technology has the defect that the liquid accumulator is connected in series in the entire refrigeration pipeline, and it becomes part of the refrigeration pipeline. When the mode is switched, it is relatively passive to increase the working medium in the pipeline or accommodate the excess working medium, which is low in efficiency. Because the liquid accumulator is part of the main pipeline, its performance often becomes the bottleneck of the entire pipeline, increasing the difficulty of controlling the integrated system. For example, when the mode is switched to the heat pipe mode, the injection rate of the working medium in the pipeline main road is low, and it is difficult to supplement the working medium in the main pipeline in time. At this time, the heat pipe performance is poor, and even cannot start, resulting in shortening of the heat pipe use time and a substantial decline in the overall economic performance of the system. SUMMARY

[0009] (1) Technical problems to be solved

[0010] In view of the mismatching problem of the optimal charge rate of the working medium of the composite system, a pressure difference active self-adaptive matching adjustment working medium system based on heat dissipation integration composite system and a control strategy thereof are provided.

[0011] (2) Technical scheme

[0012] To solve the above technical problems, the present application provides a kind of active and passive heat dissipation integrated system based on pressure difference self-adaptive matching working medium (hereinafter referred to as self-adaptive integrated system), comprising main pipeline, main pipeline includes compressor, condenser, throttling element and evaporator connected in sequence through pipeline and forms closed cycle, and first bypass parallel to the throttling element, second bypass parallel to the compressor;

[0013] It also includes a controller that can selectively close and start the first bypass and the second bypass, so that the self-adaptive integrated system switches between compressor mode and heat pipe mode;

[0014] It also includes a liquid storage branch that includes a liquid storage tank and a valve unit, the liquid storage branch is connected to the outlet of the condenser, and the liquid storage tank is installed on the liquid storage branch interface of the main pipeline through the valve unit; The controller can control the opening and closing of the valve unit, thereby controlling the liquid storage tank to store or release working medium according to the working medium pressure in the main pipeline in compressor mode and heat pipe mode.

[0015] In the compressor mode, the refrigerant flows through the evaporator, the compressor, the condenser, the throttling device in turn, and returns to the evaporator to form a cycle; In the heat pipe mode, the refrigerant flows through the evaporator, the second bypass, the condenser, the first bypass in turn, and returns to the evaporator to form a cycle.

[0016] Preferably, the absolute installation height of the condenser in the vertical direction has a positive difference with the absolute installation height of the evaporator.

[0017] Preferably, the valve unit is a solenoid valve, and the solenoid valve is connected to the controller in electrical communication signal.

[0018] The present application also provides a control method for an active and passive heat dissipation integrated system based on pressure difference self-adaptive matching working medium, for controlling the aforementioned self-adaptive integrated system:

[0019] 1) After establishing a vacuum environment in the main pipeline and the liquid storage branch, close the valve unit;

[0020] 2) According to the heat pipe mode preset charge rate, charge the working medium into the main pipeline, while keeping the valve unit closed, and the liquid storage tank maintains a vacuum environment;

[0021] 3) When the heat pipe mode switches to the compressor mode, the compressor works, the highest pressure section of the main pipeline is between the compressor outlet and the inlet of the throttling element, the high-pressure working medium enters the liquid storage tank, and the electromagnetic valve is closed after storing to a predetermined amount; after switching from the compressor mode to the heat pipe mode, the condenser outlet pipeline pressure becomes low because the compressor no longer works and is bypassed by the second bypass, at this time the valve unit is opened, the high-pressure working medium in the liquid storage tank is automatically discharged into the main pipeline under the pressure difference, and the valve unit is closed after discharging to a predetermined amount of working medium;

[0022] 4) The adaptive integrated system switches between the compressor mode and the compressor mode.

[0023] (3) Advantageous effects

[0024] Compared with the prior art, the advantageous effects of the present application are:

[0025] ① In the operation of the integrated system, when the compressor is running, the high-pressure working medium from the condenser can enter the liquid storage tank, and the valve is closed after filling to a predetermined amount; when switching to the heat pipe, the main pipeline pressure will be low, at which time the valve unit is opened to release the high-pressure working medium. The liquid storage tank can keep the working capacity of the two modes in the best state and better match the corresponding mode.

[0026] ② Moreover, the liquid storage tank is not connected in series in the main pipeline, and it exists as a branch and does not participate in the heat pipe mode and the compressor mode of the air conditioner, and is only used for storing or supplementing working medium, so whether it is the replacement of the liquid storage tank or the internal structure of the liquid storage tank will not become an influencing factor affecting the operation of the main pipeline.

[0027] ③ During the switching process from the compressor mode to the heat pipe mode in the operation of the adaptive integrated system, the working pressure in the condenser outlet can be accurately adjusted by adjusting the working pressure in the liquid storage tank, so as to adjust the working pressure in this section to the best state, and then control the pressure characteristics in the whole main pipeline. That is, a new type of adjustment method for adjusting the pressure of the main pipeline by adjusting the pressure of the liquid storage branch, which does not need to modify the main pipeline, only needs to adjust the structure of the liquid storage branch, and is convenient for installation and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only one embodiment of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0029] Figure 1A schematic diagram of an adaptive integrated system according to an embodiment of the present application.

[0030] Figure 2 A schematic diagram of a control flow of the adaptive integrated system according to an embodiment of the present application.

[0031] Figure 3 A schematic diagram of a liquid storage tank of the adaptive integrated system according to an embodiment of the present application.

[0032] Figure 4 A side view of the liquid storage tank of the adaptive integrated system according to an embodiment of the present application.

[0033] Figure 5 A Figure 4 A cross-sectional view of the liquid storage tank of the adaptive integrated system according to an embodiment of the present application.

[0034] In the drawing, the reference signs are as follows: 1, condenser; 2, evaporator; 3, compressor; 4, liquid storage tank; 41, liquid storage tank body; 42, pressure gauge; 43, liquid outlet of the liquid storage tank; 44, air bag; 45, air chamber; 46, liquid chamber; 47, air inlet; 5, throttling valve; 6, first bypass; 7, second bypass; 8, electromagnetic valve. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, purposes and effects achieved by the present application easy to understand, the technical solutions in the specific embodiments of the present application are described clearly and completely below to further illustrate the present application. Obviously, the described specific embodiments are only a part of the embodiments of the present application, rather than all the modes.

[0036] The specific embodiments will be described in the following.

[0037] Embodiment 1

[0038] Embodiment 1, referring to Figure 1 As shown in the drawing, the evaporator 2 and the evaporating fan are arranged in the indoor unit B, the condenser 3 and the condensing fan are arranged in the outdoor unit A, the throtting device and the compressor are arranged between the evaporator 2 and the condenser 1, the air conditioning system is composed of the compressor, the compressor, the condenser, the throtting device and the evaporator, and further comprises a heat pipe system, the heat pipe system shares the condensing fan, the condenser, the evaporating fan and the evaporator 2 with the air conditioning system, and further comprises the first bypass 6 and the second bypass 7 connected between the evaporator 2 and the condenser 1; the first bypass 6 is connected in parallel with the throtting device (throtting valve 5 in this embodiment), the second bypass 7 is connected in parallel with the compressor 3, and the control unit can control the reversing valve to select whether to enable the first bypass 6 and the second bypass 7, thereby realizing the work switching control of the two systems.

[0039] In the compressor mode, since the working medium output from the evaporator 2 is high-temperature gas, after the compression process of the compressor, the working medium becomes high-temperature liquid and enters the condenser 1, and the working medium output from the condenser 1 after heat exchange is low-temperature high-pressure liquid. In the heat pipe mode, the compressor does not work. The working medium output from the evaporator 2 is high-temperature gas and directly enters the condenser through the second bypass 7.

[0040] As an important creative contribution in the present embodiment, a liquid storage branch is established, which includes a liquid storage tank and a valve unit. Unlike the prior art in which the liquid storage tank is connected in series in the main pipeline, the liquid storage branch of the present embodiment is connected to the condenser outlet, and the liquid storage tank is installed on the liquid storage branch interface of the main pipeline through the valve unit; the controller can control the opening or closing of the valve unit, and the corresponding liquid storage tank can store or release the working medium in the main pipeline according to the pressure of the working medium in the main pipeline. The liquid storage branch is a buffer structure for the working medium in the integrated system, specifically:

[0041] In the compressor mode:

[0042] When switching from the heat pipe mode to the compressor mode, since the compressor mode requires less working medium, the excess working medium needs to be discharged from the main pipeline. At this time, the valve unit of the liquid storage branch is opened, and the high-pressure working medium at the outlet of the condenser enters the liquid storage tank. When the amount of working medium in the main pipeline is suitable for the compressor mode, the valve unit is closed. At this time, the liquid storage branch no longer works and is independent of the main pipeline and does not participate in the refrigeration cycle.

[0043] In the heat pipe mode:

[0044] When switching from the compressor mode to the heat pipe mode, since the heat pipe mode requires more working medium, the working medium needs to be supplemented or injected into the main pipeline. The valve unit is opened. Since the compressor does not work at this time, the working medium pressure at the outlet of the condenser is low, and there is a pressure difference between the liquid storage tank and the outlet of the condenser. The high-pressure working medium in the liquid storage tank flows out of the liquid storage tank. When the working medium in the main pipeline is suitable for the heat pipe mode, the working medium in the liquid storage tank is discharged, and the control valve 9 is closed. At this time, the liquid storage branch no longer works and is independent of the main pipeline and does not participate in the heat dissipation cycle.

[0045] Therefore, in the working of the active and passive heat dissipation integrated system based on pressure difference self-adaptive matching of working medium in the present embodiment, when the compressor is running, the high-pressure working medium at the outlet of the condenser can enter the liquid storage tank, and the valve is closed after a predetermined amount is filled. When switching to the heat pipe, the pressure of the main pipeline will be lower, and at this time the valve unit is opened to release the high-pressure working medium. The liquid storage tank can keep the working medium of the two modes in the best state and better match the corresponding mode. Moreover, the liquid storage tank is not connected in series in the main pipeline, but exists as a branch and does not participate in the heat pipe mode and the compressor mode of the air conditioner, so whether it is the replacement of the liquid storage tank or the internal structure of the liquid storage tank, it will not become an influencing factor affecting the operation of the main pipeline.

[0046] Example 2

[0047] In this embodiment, the corresponding elements are further defined.

[0048] The condenser is a key component of this adaptive integrated system. Essentially a type of heat exchanger, it primarily cools the high-temperature, high-pressure refrigerant vapor discharged from the compressor by exchanging heat with the surrounding environment, transforming it into a saturated liquid or even a subcooled liquid. The condenser's operation is exothermic, therefore its temperature is typically high. Depending on the cooling method and application scenario, this pressure difference-based adaptive matching working fluid integrated system utilizes various types of condensers, including air-cooled and water-cooled condensers. Commonly used condensers include finned condensers, shell-and-tube condensers, coaxial condensers, shell-and-coil condensers, spiral plate condensers, and immersion condensers. They use water as the cooling medium, relying on the water's temperature rise to remove the heat of condensation.

[0049] Similarly, evaporators can also use a heat exchanger structure similar to that of condensers.

[0050] There is a difference in height between the absolute installation height of the condenser and the absolute vertical installation height of the evaporator. It's worth noting that when this integrated system operates in heat pipe heat transfer mode, the heat dissipation of the system increases with the increase of the positive difference in height between the absolute installation heights of the condenser and evaporator. This positive difference can be understood as the difference between the absolute installation heights of the condenser and evaporator being a positive value. When the air conditioning system operates in heat pipe mode, the heat dissipation increases accordingly with the increase of the positive difference in height. Consequently, due to the increased length of the piping, the working fluid mass within the entire integrated system will also change, which needs to be calculated and considered when charging the working fluid.

[0051] The working fluid is a refrigerant, and specific selections can include R22, R410A, R407C, R744, R134a, R1234yf, R290, and R600a.

[0052] The specific type of compressor 1 is not limited; it can be a fixed-capacity compressor, a fixed-frequency compressor, a variable-capacity compressor, or a variable-frequency compressor.

[0053] The specific type of throttling element is not limited; for example, it can be an electronic expansion valve, a thermostatic expansion valve, a ball valve, a capillary tube, or an orifice plate, etc.

[0054] The control valves for the first and second bypasses can be check valves or solenoid valves, etc., and can only achieve selective on / off switching of the bypass.

[0055] The heat pipe mode or compressor mode refrigeration can be selected according to the indoor and outdoor temperature and the indoor and outdoor temperature difference. Optionally, an outdoor temperature sensor is arranged near the condenser and used for detecting the outdoor temperature, and an indoor temperature sensor is arranged near the evaporator and used for detecting the indoor temperature. The two temperature sensors are connected to the control unit, and the collected indoor temperature and outdoor temperature are transmitted to the control unit. The actual outer ring and inner ring temperatures are obtained by the control unit, and the temperature difference is calculated. After comparison with the threshold value preset in the control unit, the heat pipe mode or compressor mode heat conduction is selected. For example, in non-winter season, the outdoor temperature is higher than 15 DEG C, and the active heat dissipation system, i.e. the air conditioner refrigeration, is run, that is, the compressor mode. In the compressor mode, the working medium flows through the evaporator, the compressor, the condenser, the throttling device in turn, and returns to the evaporator to form a cycle. In winter, the outdoor temperature is lower than 15 DEG C, and the passive heat dissipation system, i.e. the heat pipe mode, is run for energy saving. In the heat pipe mode, the working medium flows through the evaporator, the second bypass, the condenser, the first bypass in turn, and returns to the evaporator to form a cycle. When the non-powered heat pipe system works, only the condensing fan and the evaporating fan need to be run, so that the energy utilization rate is high. In addition, the air conditioner system is started when the indoor temperature difference is large, and the compressor is prevented from exceeding the safe operation range due to the low outdoor environment temperature. The other principles of the integrated system are prior art, and will not be described here.

[0056] In addition, since the temperature in the machine room can be uneven, the temperature detected at a local position cannot truly reflect the accuracy of the indoor return air temperature. In the embodiment of the present application, two or more temperature detection devices can be arranged in the machine room, and the indoor return air temperatures detected by all the temperature detection devices are averaged to obtain the actual indoor temperature, so that the accuracy of the indoor temperature detection is improved, and the operation control precision of the air conditioning system is improved. In addition, when one of the temperature detection devices fails, the indoor return air temperature can be detected by using other effective temperature detection devices, so that the air conditioning system is prevented from running incorrectly due to single-point failure, and the working reliability of the air conditioning system is improved.

[0057] Embodiment 3

[0058] In the embodiment, a control method of the adaptive integrated system is provided, which uses the adaptive integrated system and the elements in the foregoing embodiments, and specifically includes the following steps.

[0059] 1) After a vacuum environment is established in the main pipeline and the liquid storage branch pipeline, the valve unit is closed, so that the main pipeline and the liquid storage branch pipeline form two independent areas in the entire pipeline;

[0060] 2) According to the preset filling rate of the heat pipe mode, the working medium is filled into the main pipeline, and the valve unit is kept in a closed state, and the liquid tank is kept in a vacuum environment; the preset filling rate can be calculated according to the optimal amount of working medium required by the heat pipe mode, of course, other factors can also be considered to determine the preset filling rate;

[0061] 3) The heat pipe mode can be performed first and then the compressor mode, or the working medium can be directly injected into the heat pipe mode from the previous step, and then directly switched to the compressor mode, at this time, the compressor works, and the main pipeline between the compressor outlet and the throttle element inlet is the highest pressure section, the high-pressure working medium enters the liquid tank, and the electromagnetic valve is closed after storing to the predetermined amount; after switching from the compressor mode to the heat pipe mode, the compressor no longer works and is bypassed by the second bypass, the pressure of the condenser outlet pipeline is low, at this time, the valve unit is opened, and the high-pressure working medium in the liquid tank is automatically discharged into the main pipeline under the pressure difference, and the valve unit is closed after discharging to the predetermined amount of working medium;

[0062] The integrated system switches between the compressor mode and the compressor mode. When the liquid tank is working, the amount of working medium received and released needs to be considered. When controlling the opening time of the valve unit, the controller can consider the actual pressure in the main pipeline, the outlet pressure of the condenser, the outlet flow of the liquid tank, the liquid level of the liquid tank, and the combination of the above parameters, and the actual value that can reflect whether the working medium in the main pipeline is suitable for the optimal value of the compressor mode and the heat pipe mode. Correspondingly, pressure gauges, flow meters, liquid level meters, and other measuring elements can be connected to the controller through communication signals.

[0063] Example 4:

[0064] According to the foregoing examples, the liquid tank 4 in the adaptive integrated system is connected to the main pipeline as a branch, which plays a role in buffering the amount of working medium; another function is that of an accumulator, i.e., the working medium is stored in the liquid tank 4 in a high-pressure state. In this embodiment, a specific liquid tank 4 and its application in system control are emphasized.

[0065] The liquid tank 4 includes a liquid tank body 41, a connecting port 43 is provided at the bottom of the liquid tank body 41, and a rubber air bag 44 is provided in the liquid tank 4. The rubber air bag 44 separates the internal space of the liquid tank 4 into a liquid chamber 46 and an air chamber 45. The air chamber 45 is located above the liquid chamber 46 and is provided with an air inlet nozzle 47. The liquid tank 4 is also provided with a pressure gauge 42 for displaying the pressure in the air chamber 45. The air bag 44 ensures that the gas and the working medium are not in contact, which can prevent the working medium from being contaminated by the gas and can prevent the working medium from evaporating and overflowing. However, the pressure in the air chamber 45 can be adjusted to adjust the pressure of the working medium in the liquid chamber 46.

[0066] The embodiment is innovative in that, in use, by accurately adjusting the working medium pressure in the liquid storage tank 4, the working medium pressure at the condenser outlet can be precisely adjusted when the compressor mode is switched to the heat pipe mode, the working medium pressure in this section is adjusted to the optimal state, thereby controlling the pressure characteristics in the entire main pipeline. That is, a new type of adjustment method for adjusting the main pipeline pressure by adjusting the pressure of the liquid storage branch is adopted, without the need to modify the main pipeline, only the structure of the liquid storage branch needs to be adjusted, which is convenient for installation and maintenance.

[0067] Of course, the above description is not a limitation on the present application, and the present application is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the spirit and scope of the present application should also be within the protection scope of the present application.

Claims

1. A main and passive heat dissipation integrated system based on pressure difference adaptive matching of working medium, comprising a main pipeline, the main pipeline comprising a compressor (3), a condenser (1), a throttling element and an evaporator (2) connected in sequence through the pipeline and forming a closed cycle, and a first bypass (6) connected in parallel with the throttling element and a second bypass (7) connected in parallel with the compressor (3); Further comprising a controller capable of selectively closing and starting the first bypass (6) and the second bypass (7) to switch the integrated system between the compressor mode and the heat pipe mode; Characterized in that it further comprises: a liquid storage branch comprising a liquid storage tank and a valve unit, the liquid storage branch being connected to the outlet of the condenser (1), the liquid storage tank (4) being installed on the liquid storage branch interface of the main pipeline through the valve unit, the liquid storage branch being independent of the closed cycle of the main pipeline and not participating in the main circulation of the working medium in the compressor mode and the heat pipe mode, and being started only when switching between the two modes; the controller can control the opening and closing of the valve unit, thereby controlling the liquid storage tank (4) to be able to store or release the working medium inward or outward according to the working medium pressure in the main pipeline in the compressor mode and the heat pipe mode, wherein: When switching from the heat pipe mode to the compressor mode, excess working medium needs to be discharged from the main pipeline, the liquid storage branch opens the valve unit, the high-pressure working medium at the outlet of the condenser enters the liquid storage tank, and when the working medium in the main pipeline is adapted to the compressor mode, the valve unit is closed; When switching from the compressor mode to the heat pipe mode, working medium needs to be supplemented or injected into the main pipeline, the valve unit is opened, the working medium pressure at the outlet of the condenser is low, there is a pressure difference between the liquid storage tank and the outlet of the condenser, the high-pressure working medium in the liquid storage tank flows out of the liquid storage tank, and when the working medium in the main pipeline is adapted to the heat pipe mode, the valve unit is closed after the working medium in the liquid storage tank is discharged.

2. The integrated system of active and passive heat dissipation based on pressure difference self-adapting matching working medium according to claim 1, characterized in that: In the compressor mode, the working medium flows through the evaporator, the compressor, the condenser, the throttling device in sequence, and returns to the evaporator to form a cycle; In the heat pipe mode, the working medium flows through the evaporator, the second bypass, the condenser, the first bypass in sequence, and returns to the evaporator to form a cycle.

3. The integrated system of active and passive heat dissipation based on pressure difference self-adapting matching working medium according to claim 1, characterized in that: The absolute installation height of the condenser (1) in the vertical direction has a positive difference with the absolute installation height of the evaporator (2).

4. The integrated system of active and passive heat dissipation based on pressure difference self-adapting matching working medium according to claim 1, characterized in that, The valve unit is a solenoid valve (8) connected to the controller in electrical communication signal.

5. The control method of the main and passive heat dissipation integrated system based on pressure difference adaptive matching of working medium according to any one of claims 1-4, characterized in that: 1) After establishing a vacuum environment in the main pipeline and the liquid storage branch, close the valve unit; 2) According to the preset filling rate of the heat pipe mode, fill the working medium into the main pipeline while keeping the valve unit closed, and keep the liquid storage tank in a vacuum environment; 3) When switching from the heat pipe mode to the compressor mode, the working medium with high pressure enters the liquid storage tank through the compressor, and the solenoid valve is closed after storing a predetermined amount of working medium. After switching from compressor mode to heat pipe mode, the condenser outlet pipeline pressure becomes low because the compressor no longer works and is bypassed by the second bypass, at which time the valve unit is opened, and the high-pressure working medium in the liquid tank is automatically discharged into the main pipeline under the pressure difference, and the valve unit is closed after discharging to a predetermined amount of working medium; 4) The main and passive heat dissipation integrated system based on pressure difference self-adapting matching working medium switches between the compressor mode and the compressor mode.

6. The control method of the active and passive heat dissipation integrated system based on pressure difference self-adaptive matching working medium according to claim 5, characterized in that: The liquid tank comprises a tank body, a connecting port is arranged at the bottom of the tank body, a rubber air bag is arranged in the tank, the air bag separates the internal space of the tank into a liquid chamber and an air chamber, an air inlet nozzle is arranged in the air chamber, the air chamber is located above the liquid chamber, the tank is also provided with a pressure gauge for displaying the pressure in the air chamber, the gas is isolated from the working medium by the air bag, and the pressure of the working medium in the liquid chamber can be adjusted by adjusting the pressure in the air chamber; After switching from the compressor mode to the heat pipe mode, the condenser outlet pipeline pressure becomes low, at which time the valve unit is opened, the high-pressure working medium in the liquid tank is automatically discharged into the main pipeline under a predetermined pressure difference by accurately adjusting the working pressure in the liquid tank, the working pressure at the condenser outlet is precisely adjusted, and the main pipeline pressure is adjusted by adjusting the pressure of the liquid tank branch.

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