CN117588861A - Active and passive heat dredging integrated system based on pressure difference self-adaptive matching working medium and control method thereof - Google Patents
Active and passive heat dredging integrated system based on pressure difference self-adaptive matching working medium and control method thereof Download PDFInfo
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- 239000007788 liquid Substances 0.000 claims abstract description 116
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- 238000004891 communication Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 description 26
- 238000004378 air conditioning Methods 0.000 description 17
- 238000005057 refrigeration Methods 0.000 description 14
- 230000003044 adaptive effect Effects 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 238000009833 condensation Methods 0.000 description 5
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- 238000001704 evaporation Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
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- 239000004020 conductor Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
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- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a pressure difference self-adaptive matching working medium based active and passive heat dredging integrated system, wherein a main pipeline of the system comprises a closed cycle consisting of a compressor, a condenser, a throttling element and an evaporator, a first bypass connected with the throttling element in parallel and a second bypass connected with the compressor in parallel; the integrated system also comprises a controller, wherein the controller can selectively close and start the first bypass and the second bypass to enable the integrated system to be switched between a compressor mode and a heat pipe mode; further comprises: the liquid storage branch comprises a liquid storage tank and a valve unit, the liquid storage branch is connected with the outlet of the condenser, and the liquid storage tank is arranged on a liquid storage branch interface of the main pipeline through the valve unit; the controller can control the valve unit to be opened and closed, and then control the liquid storage tank to store working media inwards or release working media outwards according to working media pressure in the main pipeline in the compressor mode and the heat pipe mode, so that the working media of the integrated system are suitable for the compressor mode and the heat pipe mode in the state of optimal filling rate.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a combined unit formed by combining a gravity type heat pipe and an air conditioner, and particularly relates to an active and passive heat dredging integrated system based on a pressure difference self-adaptive matching working medium, and a corresponding control method.
Background
The active heat transfer refers to the heat transfer of a non-spontaneous refrigeration cycle, and taking an air conditioner as an example, the working principle of an air conditioner compressor is a vapor compression refrigeration cycle, and the core task of the air conditioner compressor is to suck low-pressure low-temperature refrigerant gas and then compress the low-pressure low-temperature refrigerant gas into high-pressure high-temperature gas through mechanical motion. This process allows the refrigerant to release more heat and power the refrigeration cycle.
More specifically, the operation of the air conditioner compressor may be divided into four steps: adiabatic compression, condensation, throttling and evaporation. In the adiabatic compression stage, the electrical energy performs mechanical work, and the refrigerant is compressed in the compressor, at which time the temperature and pressure of the refrigerant increase. Then, the high-temperature and high-pressure gaseous refrigerant enters the condenser to release heat, and the gaseous refrigerant changes from gas to liquid phase to become high-pressure liquid refrigerant. Then, after the expansion valve or the throttle valve is used for throttling, the refrigerant is changed into a low-pressure low-temperature liquid state or a gas-liquid two-phase state. Finally, the refrigerant enters the evaporator to absorb heat and evaporate, thereby cooling the surrounding air or water.
This process is an involuntary refrigeration cycle that allows heat transfer from a low temperature object to a high temperature object. In general, when an air conditioner compressor is operated, it continuously plays a role in regulating the air temperature by continuously absorbing heat at one end of a low-pressure region into a refrigerant and then sending the refrigerant to a high-pressure region to be distributed into the air.
Corresponding to active heat transfer is passive heat transfer, e.g. a heat pipe system is a passive thermal management system, the working principle is mainly based on physical phenomena such as heat transfer and rapid heat transfer properties of liquids. The heat-conducting material fully utilizes the heat conduction principle and the rapid heat transfer property of the refrigeration medium, and the heat of the heating object is rapidly transferred to the outside of the heat source through the heat pipe, and the heat conduction capacity of the heat-conducting material even exceeds the heat conduction capacity of any known metal. Gravity assisted heat pipes are essentially closed pipes, wherein one end is heated and the other end is cooled, and working fluid is filled in the closed pipes, when one end of the pipe is heated, the fluid evaporates into gas after absorbing heat, the vaporized saturated steam flows to the cold end, and the vaporized saturated steam condenses and releases heat at the cold end. The condensed liquid then returns to the hot side under the force of gravity, again absorbing heat and vaporizing. The circulation is like this, realizes the continuous transmission of heat from the heat source to the cold source.
At present, the number of base stations, cabinets and square cabins is increased year by year, a large number of heating equipment needs to be cooled all the year round, if the temperature is completely reduced by an air conditioning system, an air conditioning compressor needs to be operated for a long time, the energy consumption is large, and in order to realize energy conservation and emission reduction of the air conditioning system, the operation time of the air conditioning compressor is reduced except for improving the self operation energy efficiency ratio of the air conditioning system, and natural cold sources are utilized as much as possible, so that a refrigerating system combining an air conditioning mode and a heat pipe mode is realized.
For example, chinese patent No. CN105423656a proposes one such refrigeration system and a control method thereof. The compressor bypass pipeline for selectively bypassing the compressor is connected between the air return port and the air exhaust port of the compressor, the throttling device bypass pipeline for selectively bypassing the throttling device is arranged between the first port and the second port of the throttling device, the refrigerant pump is arranged between the condenser and the throttling device, and the refrigerant pump bypass pipeline for selectively bypassing the refrigerant pump is connected between the first pump port and the second pump port of the refrigerant pump, so that the refrigerating system can work by selecting different refrigerant flow paths at different environment temperatures, the natural cold source can be utilized maximally, the efficient operation of the refrigerating system can be realized, and the energy consumption of the refrigerating system is greatly reduced.
However, when the air conditioning system is operated in the heat pipe system mode, the liquid filling rate difference is great compared with that of the air conditioning system in the compressor mode, and in general, the optimal working quality required by the heat pipe system mode is 1-2 times that of the air conditioning system in the compressor mode, so that the two systems cannot operate at the optimal working condition point due to the direct mode switching. In CN105423656a, the refrigeration system further includes a liquid reservoir connected in series between the condenser and the refrigerant pump, one end of the liquid reservoir is connected to the second condensation opening of the condenser, and the other end of the liquid reservoir is connected to the first pump opening of the refrigerant pump and the first end of the bypass line of the refrigerant pump, and the liquid reservoir is used for storing the refrigerant for the circulation loop. The liquid accumulator can be used as a buffer element of working medium, and the working medium in the whole refrigeration cycle pipeline can be regulated to normally rotate. However, the existing technology has the defects that the liquid storage device is connected in series in the whole refrigeration pipeline, and becomes a part of the refrigeration pipeline, and when the mode is switched, the working medium is relatively passively added into the pipeline or redundant working medium is stored, so that the efficiency is low, because the liquid storage device is used as a part of the pipeline trunk, the performance of the liquid storage device often becomes the bottle diameter of the whole pipeline, the difficulty in controlling the integrated system is increased, for example, when the mode is switched to the heat pipe mode, the injection rate of the working medium in the pipeline trunk is lower, the working medium in the liquid storage device is difficult to be timely added into the trunk pipeline, at the moment, the heat pipe performance is poor, even the heat pipe cannot be started, the service time of the heat pipe is shortened, and the overall economic performance of the system is greatly reduced.
Disclosure of Invention
(1) Technical problem to be solved
Aiming at the problem of mismatching of the optimal filling rate of working media of the composite system, the active self-adaptive matching and adjusting working media system based on the pressure difference of the heat dredging integrated composite system and a control strategy thereof are provided.
(2) Technical proposal
In order to solve the technical problems, the invention provides a pressure difference self-adaptive matching working medium based active and passive heat dredging integrated system (hereinafter referred to as self-adaptive integrated system), which comprises a main pipeline, wherein the main pipeline comprises a compressor, a condenser, a throttling element and an evaporator which are sequentially connected through pipelines and form a closed cycle, and a first bypass connected with the throttling element in parallel and a second bypass connected with the compressor in parallel;
the self-adaptive integrated system also comprises a controller, wherein the controller can selectively close and start the first bypass and the second bypass to enable the self-adaptive integrated system to be switched between a compressor mode and a heat pipe mode;
further comprises: the liquid storage branch comprises a liquid storage tank and a valve unit, the liquid storage branch is connected with the outlet of the condenser, and the liquid storage tank is arranged on a liquid storage branch interface of the main pipeline through the valve unit; the controller can control the valve unit to open and close, and then control the liquid storage tank and can inwards accomodate working medium or outwards release working medium according to the working medium pressure in the main pipeline in compressor mode and the heat pipe mode.
In the compressor mode, the refrigerant flows through the evaporator, the compressor, the condenser and the throttling device in sequence, returns to the evaporator and forms a cycle; in the heat pipe mode, the refrigerant flows through the evaporator, the second bypass, the condenser, the first bypass in this order, and returns to the evaporator to form a cycle.
Preferably, the absolute mounting height of the condenser in the vertical direction has a positive drop from the absolute mounting height of the evaporator.
Preferably, the valve unit is a solenoid valve, the solenoid valve being in electrical communication with the controller.
The application also provides a control method of the active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium, which is used for controlling the self-adaptive integrated system:
1) After a vacuum environment is established in the main pipeline and the liquid storage branch, the valve unit is closed;
2) Filling working media into the main pipeline according to a preset filling rate of the heat pipe mode, and simultaneously keeping a valve unit in a closed state, and keeping a vacuum environment in a liquid storage tank;
3) When the heat pipe mode is switched to the compressor mode for operation, working is performed by the compressor, a highest pressure section of the main pipeline is arranged between the outlet of the compressor and the inlet of the throttling element, high-pressure working medium enters the liquid storage tank, and the electromagnetic valve is closed after the working medium is stored to a preset amount; after the compressor mode is switched to the heat pipe mode, the compressor is not operated any more and is bypassed by the second bypass, the pressure of an outlet pipeline of the condenser is lowered, the valve unit is opened, 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 the high-pressure working medium is discharged to a preset amount of working medium;
4) The adaptive integrated system switches between a compressor mode and a compressor mode.
(3) Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) in the operation of the integrated system, when the compressor operates, the high-pressure working medium from the condenser can enter the liquid storage tank, and the valve is closed after the high-pressure working medium is filled with a preset amount; when the heat pipe is switched to, the pressure of the main pipeline becomes low, and the valve unit is opened to release the high-pressure working medium. The liquid storage tank can enable the working media of the two modes to be in an optimal state and be better matched with the corresponding modes.
(2) The liquid storage tank is not connected in series into the main pipeline, is in a branch, does not participate in a heat pipe mode and a compressor mode of the air conditioner, and is only used for storing or supplementing working media, so that the liquid storage tank is not changed or the internal structure of the liquid storage tank is not an influence factor for influencing the operation of the main pipeline.
(3) When the self-adaptive integrated system works, in the process of switching the compressor mode to the heat pipe mode, the working medium pressure in the liquid storage tank can be accurately regulated, so that the working medium pressure at the outlet of the condenser is accurately regulated, the working medium pressure of the section is regulated to an optimal state, and the pressure characteristic in the whole main pipeline is further controlled. The novel regulating method for regulating the pressure of the main pipeline by adopting the mode of regulating the pressure of the liquid storage branch is not needed to modify the main pipeline, and only the structure of the liquid storage branch is needed to be regulated, so that the installation and the maintenance are convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments or the prior art will be briefly described, and it is apparent that the drawings in the following description are only one embodiment of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an adaptive integrated system according to an embodiment of the present invention.
Fig. 2 is a control flow diagram of the adaptive integrated system according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a liquid storage tank of the adaptive integrated system according to an embodiment of the present invention.
Fig. 4 is a side view of a reservoir of the adaptive integrated system of one embodiment of the present invention.
Fig. 5 is a cross-sectional view of a reservoir of the adaptive integrated system of one embodiment of the present invention.
The marks in the drawings are: 1. a condenser; 2. an evaporator; 3. a compressor; 4. a liquid storage tank; 41. a liquid storage tank body; 42. a pressure gauge; 43. a liquid outlet of the liquid storage tank; 44. an air bag; 45. a gas chamber; 46. a liquid chamber; 47. an air charging nozzle; 5. a throttle valve; 6. a first bypass; 7. a second bypass; 8. a solenoid valve.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present invention easy to understand, the technical solutions in the embodiments of the present invention are clearly and completely described below to further illustrate the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all versions.
The details will be described in the following examples.
Example 1
In the first embodiment, referring to fig. 1, an evaporator 2 and an evaporation fan are disposed in an indoor unit B, a condenser 3 and a condensation fan are disposed in an outdoor unit a, a throttle device and a compressor are disposed between the evaporator 2 and the condenser 1, an air conditioning system is composed of the compressor, the condenser, the throttle device and the evaporator, and further includes a heat pipe system, the heat pipe system shares the condensation fan, the condenser, the evaporation fan and the evaporator 2 with the air conditioning system, and the heat pipe system further includes a first bypass 6 and a second bypass 7 which are communicated between the evaporator 2 and the condenser 1; the first bypass 6 is connected in parallel with the throttling device (in this embodiment, the throttling valve 5), 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 start the first bypass 6 and the second bypass 7, so as to realize the work switching of the two systems.
In the compressor mode, the working medium output from the evaporator 2 is in a high-temperature gaseous state, and after the working medium is compressed by the compressor, the working medium becomes a high-temperature liquid state and enters the condenser 1, and the working medium output from the condenser 1 after heat exchange is in a low-temperature high-pressure liquid state. While in the heat pipe mode, the compressor is not operating. The working medium output from the evaporator 2 is in a high-temperature gaseous state and directly enters the condenser through the second bypass 7.
As an important creative contribution in this embodiment, a liquid storage branch is set up, the liquid storage branch includes a liquid storage tank and a valve unit, unlike the liquid storage tank in the prior art, which is connected in series in the main pipeline, the liquid storage branch of this embodiment 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 valve unit to open or close, and corresponding liquid storage tank can accomodate working medium in the main pipeline or release working medium in to the main pipeline according to the working medium pressure in the main pipeline. The buffer structure of stock solution branch road as the interior working medium volume of integration system specifically does:
in compressor mode:
when the heat pipe mode is switched to the compressor mode, because less working medium is needed in the compressor mode, redundant working medium is needed to be discharged from the main pipeline, at the moment, the valve unit is opened by the liquid storage branch, 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 suitable for the compressor mode, the valve unit is closed. At this time, the liquid storage branch does not work any more, does not participate in the refrigeration cycle, and is independent of the main pipeline.
The heat pipe mode is as follows:
when the compressor mode is switched to the heat pipe mode, because more working medium is needed in the heat pipe mode, the working medium is needed to be supplemented or injected into the main pipeline, the valve unit is opened, and because the compressor is not operated at this time, the working medium pressure at the outlet of the condenser is low, the pressure difference exists 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 suitable for the heat pipe mode, the control valve 9 is closed after the working medium in the liquid storage tank is discharged. At this time, the liquid storage branch does not work any more, does not participate in the heat conduction cycle, and is independent from the main pipeline.
Therefore, in the working of the active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium in the embodiment, when the compressor operates, the high-pressure working medium from the condenser can enter the liquid storage tank, and the valve is closed after the high-pressure working medium is filled with a preset amount; when the heat pipe is switched to, the pressure of the main pipeline becomes low, and the valve unit is opened to release the high-pressure working medium. The liquid storage tank can enable the working quality of the two modes to be in an optimal state and to be better matched with the corresponding modes, the liquid storage tank is not connected in series into the main pipeline, and the liquid storage tank exists as a branch and does not participate in a heat pipe mode and a compressor mode of an air conditioner, so that the liquid storage tank can not be changed or an internal structure of the liquid storage tank, and the liquid storage tank can not be an influence factor influencing the operation of the main pipeline.
Example 2
In the present embodiment, the corresponding elements are further defined.
The condenser is a key component of the self-adaptive integrated system, and essentially belongs to one type of heat exchanger, and is mainly responsible for cooling high-temperature and high-pressure refrigerant vapor discharged by the compressor through heat exchange with surrounding environment media, so that the high-temperature and high-pressure refrigerant vapor is converted into saturated liquid or even supercooled liquid. The condenser operation is exothermic and therefore its temperature is typically high. According to the difference of cooling mode and application scene, this condenser based on active and passive heat of pressure differential self-adaptation matching working medium dredges integration system has multiple types: such as air cooled condensers, water cooled condensers, and the like, commonly used condensers include fin-type condensers, shell-and-tube condensers, double-tube condensers, shell-and-coil condensers, spiral-plate condensers, submerged condensers, and the like. The water is used as a cooling medium, and the condensation heat is taken away by the temperature rise of the water.
The evaporator can also be of a heat exchanger structure similar to that of the condenser.
The absolute mounting height of the condenser and the absolute mounting height of the evaporator in the vertical direction have a drop, and it is worth noting that when the integrated system operates in the heat pipe heat transfer mode, the heat dissipation capacity of the integrated system increases along with the increase of the positive drop between the absolute mounting height of the condenser and the absolute mounting height of the evaporator, and the positive drop is understood as that the difference between the absolute mounting height of the condenser and the absolute mounting height of the evaporator is a positive value. When the air conditioning system operates in a heat pipe mode, the heat dissipation capacity is correspondingly increased along with the increase of the positive fall, and correspondingly, the working medium capacity in the whole integrated system is also changed due to the length of the pipeline, so that the working medium is required to be calculated and considered when the working medium is filled.
For working fluids, which are refrigerants, specific options may include R22, R410A, R407C, R744, R134a, R1234yf, R290, and R600a.
The specific type of the compressor 1 is not limited, and may be a constant volume compressor or a constant frequency compressor, or may be a variable capacity compressor or a variable frequency compressor.
The specific type of throttling element is not limited and may be, for example, an electronic expansion valve, a thermal expansion valve, a ball valve, a capillary tube or orifice plate, or the like.
The control valves of the first bypass and the second bypass can be one-way valves or electromagnetic valves and the like, and can only realize selective on-off of the bypasses.
The heat pipe mode or the compressor mode can be selected for refrigeration according to the indoor and outdoor temperature and the indoor and outdoor temperature difference, an outdoor temperature sensor is arranged near the condenser for detecting the outdoor temperature, an indoor temperature sensor is arranged near the evaporator for detecting the indoor temperature, the two temperature sensors are respectively connected with the control unit, the collected indoor temperature and the collected outdoor temperature are sent to the control unit, the control unit obtains the actual outer ring temperature and the actual inner ring temperature, calculates the temperature difference, and the heat pipe mode or the compressor mode heat transmission and conduction are selected after the temperature difference is compared with a preset threshold value in the control unit. For example, when the outdoor temperature is higher than 15 ℃ in non-winter, the active heat dredging system is operated to perform air conditioning refrigeration, namely a compressor mode, and in the compressor mode, working media sequentially flow through the evaporator, the compressor, the condenser and the throttling device, and then return to the evaporator to form circulation; and when the outdoor temperature is lower than 15 ℃ in winter, the passive heat dredging system, namely a heat pipe mode is operated in consideration of energy conservation, and working media sequentially flow through the evaporator, the second bypass, the condenser and the first bypass in the heat pipe mode and then return to the evaporator to form circulation. When the unpowered heat pipe system works, only the condensing fan and the evaporating fan are required to operate, so that the energy utilization rate is high, the device is started when the indoor temperature difference is large, and meanwhile, the condition that the compressor exceeds a safe operation range when the air conditioning system is operated under the condition of low outdoor environment temperature is avoided. Other principles about the integrated system are prior art and will not be described in detail.
In addition, because the condition of uneven temperature possibly exists in the machine room, the accuracy of indoor return air temperature cannot be truly reflected by detecting the temperature of a certain local position. In the embodiment of the invention, two or more temperature detection devices can be arranged in the machine room, the temperature detection devices can be arranged at different positions in the machine room, and then the indoor return air temperatures detected by all the temperature detection devices are averaged to obtain the indoor actual temperature, so that the accuracy of indoor temperature detection can be improved, and the operation control precision of an air conditioning system is further improved. In addition, when one of the temperature detection devices fails, other effective temperature detection devices can be used for detecting indoor return air temperature, so that operation errors of the air conditioning system caused by single-point faults are avoided, and the working reliability of the air conditioning system is improved.
Example 3
In this embodiment, a control method of an adaptive integrated system is provided, where the adaptive integrated system and elements thereof in the foregoing embodiment are used, and specifically includes:
1) After a vacuum environment is established in the main pipeline and the liquid storage branch, the valve unit is closed, and two independent areas are formed by the main pipeline and the liquid storage branch in the whole pipeline;
2) Filling working media into the main pipeline according to a preset filling rate of the heat pipe mode, and simultaneously keeping a valve unit in a closed state, and keeping a vacuum environment in a liquid storage tank; the preset filling rate can be calculated according to the optimal working quality required by the heat pipe mode, and of course, other factors can be considered to determine the preset filling rate;
3) The working medium can be directly injected from the previous step according to the heat pipe mode and then is directly switched to the compressor mode to operate, at the moment, work is done by the compressor, the highest pressure section of the main pipeline is arranged between the outlet of the compressor and the inlet of the throttling element, the high-pressure working medium enters the liquid storage tank, and the electromagnetic valve is closed after the working medium is stored to a preset amount; after the compressor mode is switched to the heat pipe mode, the compressor is not operated any more and is bypassed by the second bypass, the pressure of an outlet pipeline of the condenser is lowered, the valve unit is opened, 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 the high-pressure working medium is discharged to a preset amount of working medium;
the integrated system switches between a compressor mode and a compressor mode. When the liquid storage tank works, the quantity of the stored and released working medium is required to be considered, when the controller controls the opening time of the valve unit, the actual pressure in the main pipeline, the outlet pressure of the condenser, the outlet flow of the liquid storage tank, the liquid level of the liquid storage tank and other parameters and the combination of the parameters can be considered, and the controller can correspondingly adopt measuring elements such as a pressure meter, a flowmeter, a liquid level meter and the like to be connected with the communication signals of the controller according to the condition that whether the working medium in the main pipeline is suitable for the optimal value of the compressor mode and the heat pipe mode or not can be actually reflected.
Example 4:
according to the foregoing embodiment, the liquid storage tank 4 in the adaptive integrated system is connected to the main pipe as a branch, which on one hand plays a role in buffering the working quality; another function is the function of an accumulator, i.e. the working medium is stored in the fluid reservoir 4 in a high-pressure state. In the present embodiment, a specific liquid storage tank 4 and its application in system control are focused on.
The liquid storage tank 4 comprises a liquid storage tank body 41, a connecting port 43 is arranged at the bottom of the liquid storage tank body 41, a rubber air bag 44 is arranged in the liquid storage tank 4, the rubber air bag 44 divides the interior of the liquid storage tank 4 into a liquid chamber 46 and an air chamber 45, an air inlet and charging nozzle 47 is arranged in the air chamber 45, the air chamber 45 is positioned at the upper part of the liquid chamber 46, a pressure gauge 42 is further arranged on the liquid storage tank 4 and used for displaying the pressure in the air chamber 45, and the air is not contacted with a working medium through the air bag 44, so that the working medium is not polluted by the air, the working medium can be prevented from evaporating and overflowing, and the pressure of the working medium in the liquid chamber 46 can be regulated by regulating the pressure in the air chamber 45.
The innovation of the embodiment is that when the compressor is switched to the heat pipe mode, the working medium pressure at the outlet of the condenser can be accurately regulated by accurately regulating the working medium pressure in the liquid storage tank 4 during use, and the working medium pressure of the section is regulated to an optimal state, so that the pressure characteristic in the whole main pipeline is controlled. The novel regulating method for regulating the pressure of the main pipeline by adopting the mode of regulating the pressure of the liquid storage branch is not needed to modify the main pipeline, and only the structure of the liquid storage branch is needed to be regulated, so that the installation and the maintenance are convenient.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that other variations, modifications, additions and substitutions are possible, without departing from the scope of the invention as disclosed in the accompanying claims.
Claims (6)
1. The active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium comprises a main pipeline, wherein the main pipeline comprises a compressor (3), a condenser (1), a throttling element and an evaporator (2) which are sequentially connected through pipelines and form a closed cycle, a first bypass (6) connected with the throttling element in parallel, and a second bypass (7) connected with the compressor (3) in parallel;
the system also comprises a controller which can selectively close and activate the first bypass (6) and the second bypass (7) to enable the integrated system to be switched between a compressor mode and a heat pipe mode;
characterized by further comprising:
the liquid storage branch comprises a liquid storage tank and a valve unit, the liquid storage branch is connected with the outlet of the condenser (1), and the liquid storage tank (4) is arranged on a liquid storage branch interface of the main pipeline through the valve unit; the controller can control the valve unit to open and close, and then control the liquid storage tank (4) and can inwards accomodate working medium or outwards release working medium according to the working medium pressure in the main pipeline in compressor mode and the heat pipe mode.
2. The active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium according to claim 1, wherein the system is characterized in that: in the compressor mode, working medium flows through the evaporator, the compressor, the condenser and the throttling device in sequence, and returns to the evaporator to form circulation;
in the heat pipe mode, working medium flows through the evaporator, the second bypass, the condenser and the first bypass in sequence, and returns to the evaporator to form circulation.
3. The active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium according to claim 1, wherein the system is characterized in that:
the absolute mounting height of the condenser (1) in the vertical direction has a positive drop from the absolute mounting height of the evaporator (2).
4. The active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium according to claim 1, wherein the valve unit is an electromagnetic valve (8), and the electromagnetic valve (8) is in electrical communication signal connection with the controller.
5. The control method of the active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium according to any one of claims 1 to 4, wherein the control method is characterized by comprising the following steps:
1) After a vacuum environment is established in the main pipeline and the liquid storage branch, the valve unit is closed;
2) Filling working media into the main pipeline according to a preset filling rate of the heat pipe mode, and simultaneously keeping a valve unit in a closed state, and keeping a vacuum environment in a liquid storage tank;
3) When the heat pipe mode is switched to the compressor mode for operation, working is performed by the compressor, a highest pressure section of the main pipeline is arranged between the outlet of the compressor and the inlet of the throttling element, high-pressure working medium enters the liquid storage tank, and the electromagnetic valve is closed after the working medium is stored to a preset amount; after the compressor mode is switched to the heat pipe mode, the compressor is not operated any more and is bypassed by the second bypass, the pressure of an outlet pipeline of the condenser is lowered, the valve unit is opened, 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 the high-pressure working medium is discharged to a preset amount of working medium;
4) The active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium is switched between a compressor mode and a compressor mode.
6. The control method of the active and passive heat dredging integrated system based on the pressure difference self-adaptive matching working medium, which is disclosed in claim 5, is characterized in that: the liquid storage tank comprises a liquid storage tank body, wherein a connecting port is arranged at the bottom of the liquid storage tank body, a rubber air bag is arranged in the liquid storage tank, the air bag is used for spacing the interior of the liquid storage tank into a liquid chamber and an air chamber, the air chamber is provided with an air inlet nozzle, the air chamber is positioned at the upper part of the liquid chamber, the liquid storage tank is also provided with a pressure gauge for displaying the pressure in the air chamber, the air is isolated from a working medium through the air bag, and the pressure of the working medium in the liquid chamber can be adjusted through adjusting the pressure in the air chamber;
after the compressor mode is switched to the heat pipe mode, the pressure of an outlet pipeline of the condenser becomes low, the valve unit is opened at the moment, the working medium pressure in the liquid storage tank is accurately regulated, high-pressure working medium in the liquid storage tank is automatically discharged into a main pipeline under a preset pressure difference, the working medium pressure at the outlet of the condenser is accurately regulated, and the pressure of the main pipeline is regulated by adopting a mode of regulating the pressure of a liquid storage branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311838807.8A CN117588861A (en) | 2023-12-28 | 2023-12-28 | Active and passive heat dredging integrated system based on pressure difference self-adaptive matching working medium and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311838807.8A CN117588861A (en) | 2023-12-28 | 2023-12-28 | Active and passive heat dredging integrated system based on pressure difference self-adaptive matching working medium and control method thereof |
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| CN117588861A true CN117588861A (en) | 2024-02-23 |
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| CN202311838807.8A Pending CN117588861A (en) | 2023-12-28 | 2023-12-28 | Active and passive heat dredging integrated system based on pressure difference self-adaptive matching working medium and control method thereof |
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| Country | Link |
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| CN (1) | CN117588861A (en) |
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2023
- 2023-12-28 CN CN202311838807.8A patent/CN117588861A/en active Pending
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