Novel combined type heat exchange system and control method

Abstract

The invention discloses a novel combined type heat exchange system and a control method, and relates to the technical field of vehicle-mounted refrigeration. The system comprises a main refrigerating part, an energy storage part and a refrigerating part, wherein the main refrigerating part utilizes a cold source and a cold storage medium in the energy storage body to refrigerate or store cold; and the secondary refrigeration part comprises a semiconductor refrigeration piece. The cold end of the semiconductor refrigeration piece is coupled to the air flow path or the energy storage body of the system to provide supplementary or deep refrigeration, and the hot end of the semiconductor refrigeration piece dissipates heat through the heat dissipation structure. Preferably, the heat dissipation structure is immersed in the cold storage medium, and the cold storage medium is used for absorbing heat of the hot end. The main refrigeration part and the secondary refrigeration part are combined, heat management of the secondary refrigeration part is optimized, higher refrigeration capacity is achieved, and the requirement for lower refrigeration temperature can be met.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and particularly to a novel composite heat exchange system and a control method therefor. Background Art

[0002] As cars have become an important part of modern life, people's requirements for in-vehicle comfort and convenience have been increasing day by day. An in-vehicle refrigerator, as a device that can provide refrigerated or frozen food and beverages for drivers and passengers, has received extensive attention. Currently, there are mainly two types of in-vehicle refrigerators on the market: thermoelectric refrigerators and compressor refrigerators.

[0003] Thermoelectric refrigerators utilize the Peltier effect for refrigeration. Their advantages include simple structure, small size, no noise and vibration caused by moving parts, and relatively low cost. However, their disadvantages are also very prominent: low refrigeration efficiency, resulting in high energy consumption; limited refrigeration capacity, usually only able to achieve a temperature difference of 15 - 20°C lower than the ambient temperature, making it difficult to meet the requirements of refrigerated storage or even freezing; slow cooling speed.

[0004] Compressor refrigerators adopt a vapor compression refrigeration cycle similar to that of household refrigerators, which can provide fast and strong refrigeration effects, reaching refrigeration temperatures below 0°C and even freezing temperatures of -18°C, and also having relatively high refrigeration efficiency. However, such refrigerators require a complete set of refrigeration systems to be built-in, including a compressor, a condenser, an evaporator, and a throttling device, etc., resulting in their complex structure, large volume, and heavy weight. They not only occupy the in-vehicle space but may also affect the fuel economy or driving range of the vehicle. At the same time, the compressor generates certain noise and vibration during operation, affecting the driving experience. In addition, the cost of such refrigerators is also relatively high.

[0005] More importantly, both of the above two types of in-vehicle refrigerators face a common problem: how to continue refrigerating after the vehicle engine is turned off. The traditional solution is to rely on the vehicle's battery for power supply, but this will consume a large amount of electrical energy, which may affect the normal start of the vehicle. Especially in the case of long-term parking, after the battery runs out of power, the refrigerator loses its refrigeration capacity, and the internal temperature rises rapidly, unable to guarantee the storage quality of items.

[0006] In order to solve these problems, researchers began to explore solutions to integrate vehicle refrigerators with the vehicle's own air conditioning system. Vehicle air conditioning systems usually have a refrigeration power that far exceeds the needs of refrigerators. Using its "surplus" cold capacity to cool the refrigerator can save the refrigerator's own compressor and condenser, thereby achieving miniaturization, light weight, low noise and low cost. However, simple integration methods, such as directly introducing air conditioning cold air or through a simple external heat exchanger, often have problems such as low heat exchange efficiency, imprecise temperature control, and inability to utilize cold storage. Although some solutions that introduce the concept of cold storage can solve the problem of cooling after the engine is turned off to a certain extent, there is still room for improvement in the efficiency of cold storage / release, the compactness of the structure, and the intelligence of the control strategy. For example, how to efficiently store cold in a limited volume? How to quickly and effectively release the stored cold to the inside of the refrigerator? How to intelligently manage the cold storage and release process according to actual needs and vehicle status? How to integrate the air conditioning system while meeting the user's demand for deep freezing (such as -18°C)? These are challenges that existing technologies have not been able to perfectly solve.

[0007] Therefore, developing a new type of vehicle refrigeration technology solution can not only fully utilize the advantages of the vehicle air-conditioning system, but also achieve long-term refrigeration after the engine is turned off through efficient cold storage technology. At the same time, it has a compact structure, quiet operation, intelligent temperature control capabilities and optional deep refrigeration functions, which has important practical significance and market value. Summary of the invention

[0008] The present invention aims to solve the problem that existing on-board refrigeration technologies are insufficient in meeting deep refrigeration requirements (such as reaching a freezing temperature of -18°C) and in refrigeration capacity when under high load or when rapid cooling is required. The lower limit of the refrigeration temperature of the traditional system that relies on on-board air-conditioning refrigerants and phase-change cold storage materials is limited by the evaporation temperature of the refrigerant and the phase change point of the cold storage material, making it difficult to achieve deep freezing; and although the system that simply uses semiconductor refrigeration elements (TEC) can reach low temperatures, its refrigeration efficiency is low and its power consumption is high, especially when the heat dissipation conditions are poor, the performance is severely degraded. Therefore, there is an urgent need for a hybrid refrigeration solution that can combine the advantages of different refrigeration technologies, utilize the existing cold sources of the vehicle, provide powerful supplementary or deep refrigeration capabilities, and has an integrated structure and effective thermal management.

[0009] In order to solve the above technical problems, in a first aspect, the present invention provides a novel composite heat exchange system, comprising:

[0010] The main refrigeration unit is suitable for utilizing a cold source for refrigeration and / or cold storage, and the main refrigeration unit comprises:

[0011] An energy storage body, used to absorb and store the cold energy transmitted by the cold source, the energy storage body comprising a shell and an internal cold storage medium;

[0012] An air duct system having at least one cooling channel passing through the energy storage body for guiding air to exchange heat with the energy storage body;

[0013] A heat exchange part communicating with the cold source and adapted to transfer the cold quantity of the cold source to the energy storage body and / or the air flowing through the cooling channel;

[0014] An air guiding part for driving air to flow through the air duct system;

[0015] A secondary refrigeration part for providing supplementary or deep refrigeration, the secondary refrigeration part comprising:

[0016] A thermoelectric cooler having a cold end and a hot end; the cold end is coupled to the air flow path of the air duct system or the energy storage body for secondary refrigeration of the air flowing through the air duct system or for cooling the cold storage medium.

[0017] This hybrid structure enables the system to utilize the relatively efficient refrigeration method of the main refrigeration part and to start the secondary refrigeration part (TEC) when needed to achieve a lower temperature or enhance the refrigeration power.

[0018] In some alternative embodiments of the present invention, there is also a heat dissipation structure connected to the hot end of the thermoelectric cooler, and the heat dissipation structure is immersed in the cold storage medium. This design ingeniously utilizes the existing cold storage medium with a large heat capacity in the main refrigeration part as the heat dissipation medium for the hot end of the thermoelectric cooler. The effects are as follows: the structure is compact, no additional heat dissipation fan or heat dissipation space is required; the cold storage medium is used to absorb heat, and the heat dissipation effect is good, especially when the temperature of the cold storage medium is low, which is beneficial to maintaining the stable and efficient operation of the TEC.

[0019] Preferably, the heat dissipation structure includes at least one third heat exchange fin for increasing the heat exchange area between the hot end and the cold storage medium. The addition of the heat exchange fins further enhances the heat dissipation ability of the hot end to the cold storage medium, improves the heat dissipation efficiency, and thus can better ensure the performance of the TEC.

[0020] In some alternative embodiments of the present invention, the secondary refrigeration part further includes a cold dissipation structure located in the air flow path of the air duct system, and the cold dissipation structure is connected to the cold end of the thermoelectric cooler. This method directly applies the cold quantity generated by the TEC to the circulating air, which is the most direct and efficient secondary air cooling method and can quickly reduce the outlet air temperature.

[0021] Preferably, the cold dissipation structure includes at least one fourth heat exchange fin for increasing the heat exchange area between the cold end and the air. The addition of the heat exchange fins can significantly improve the efficiency of transferring the cold quantity from the cold end to the air, making the secondary refrigeration effect better.

[0022] In some alternative embodiments of the present invention, the cooling channel includes at least one air duct; the heat exchange part further has a second heat exchange structure located inside the air duct, and the second heat exchange structure includes at least one second heat exchange fin for increasing the heat exchange area between the air flowing through the air duct and the cold source. Adding the second heat exchange structure inside the air duct can directly perform forced cooling on the air, further improving the refrigeration efficiency and the cooling rate.

[0023] In some alternative embodiments of the present invention, the second heat exchange fin is connected to the inner wall of the air duct. This ensures sufficient contact between the second heat exchange fin and the flowing air.

[0024] In some alternative embodiments of the present invention, as another alternative way of cold-end coupling, the cold end of the thermoelectric cooler is directly coupled to the housing or internal structure of the energy storage body through a heat conduction structure. This method is mainly used for deep cooling of the cold storage medium itself, enabling it to store colder cold energy, and is applicable to application scenarios that require maintaining an extremely low temperature for a long time.

[0025] In some alternative embodiments of the present invention, the heat exchange part of the main refrigeration part preferably includes a first heat exchange structure in contact with the cold storage medium, and this structure includes a cold source channel for the cold source to flow through and optional first heat exchange fins. Adopting an efficient heat exchange structure for the main refrigeration part can ensure the performance of basic refrigeration and cold storage, laying a foundation for the overall efficient operation of the hybrid system.

[0026] In some alternative embodiments of the present invention, the heat exchange part of the main refrigeration part may further include a temperature control valve. This enables independent control of the cold source flow rate of the main refrigeration part and better coordination with the operation of the secondary refrigeration part.

[0027] In some alternative embodiments of the present invention, the air guiding part includes a fan, which is a basic component for driving air circulation.

[0028] In a second aspect, the present invention provides a control method for a novel composite heat exchange system. The composite heat exchange system includes an energy storage body, a heat exchange part communicating with a cold source, and an air guiding part for driving air to flow through the energy storage body for heat exchange, and a secondary refrigeration part composed of thermoelectric coolers; the energy storage body includes a housing having an internal accommodation space and a cold storage medium filled in the internal accommodation space; the control method includes the following steps:

[0029] Obtain the actual temperature TC in the storage space served by the cold storage system and the target temperature TS set by the user;

[0030] Obtain the actual temperature TX of the energy storage body and the cold storage saturation temperature TXb of the cold storage medium;

[0031] Control the operating state of the air guiding part and the interaction state between the heat exchange part and the cold source according to the comparison result between the actual temperature TC and the target temperature TS, and the comparison result between the actual temperature TX and the cold storage saturation temperature TXb;

[0032] Control the start and stop of the thermoelectric cooler according to the comparison result between the actual temperature TC and the target temperature TS, and / or the comparison result between the actual temperature TX and the cold storage saturation temperature TXb.

[0033] In some alternative embodiments of the present invention, the step of controlling the start and stop of the thermoelectric cooler includes: when it is detected that the actual temperature TC is greater than the first temperature threshold, turn on the thermoelectric cooler. This utilizes the fast response and forced cooling ability of the TEC to accelerate the cooling process.

[0034] In some alternative embodiments of the present invention, the step of controlling the start and stop of the thermoelectric cooler further includes: when it is detected that the actual temperature TC is less than the second temperature threshold and the actual temperature TX is greater than the third temperature threshold, turn off the thermoelectric cooler. A stop logic for the secondary refrigeration part (TEC). For example, when executing the above-mentioned "priority cold storage logic" (TC is already low but TX is still high), turn off the thermoelectric cooler. Because at this time the main goal is cold storage and the TEC is not needed to work, turning it off can save energy.

[0035] In some alternative embodiments of the present invention, the step of controlling the start and stop of the thermoelectric cooler further includes: when it is detected that the actual temperature TC is less than the second temperature threshold and the actual temperature TX is less than the fourth temperature threshold, obtain the ambient temperature TE. If the ambient temperature TE is greater than a preset fifth threshold, turn on the thermoelectric cooler; otherwise, turn off the thermoelectric cooler. Introduce the ambient temperature (TE) as an additional judgment basis for the control of the secondary refrigeration part (TEC). For example, after executing the above-mentioned "target achieved logic" (both TC and TX are already low), if it is detected that the ambient temperature TE is higher than a certain preset fifth threshold (such as 38 °C), still turn on the thermoelectric cooler to resist heat intrusion in a high-temperature environment; otherwise, turn it off. This increases the adaptability of the control system to external environmental changes.

[0036] Compared with the prior art, the present invention innovatively combines the main refrigeration part and the secondary refrigeration part (TEC), and optimizes its integration method and thermal management, bringing the following significant beneficial effects:

[0037] 1. Achieve deep refrigeration capacity: The addition of the secondary refrigeration part (TEC) enables the system to break through the temperature limit of traditional solutions and reach a deep freezing temperature of, for example, -18 °C.

[0038] 2. Enhanced peak refrigeration power: When rapid cooling or dealing with high heat loads is required, the TEC can provide additional cooling capacity, significantly improving the system's response speed and maximum refrigeration capacity.

[0039] 3. Integrated technology advantages: Combining the advantages of the main refrigeration part that utilizes the existing in-vehicle cold source (relatively high efficiency) and the secondary refrigeration part (able to reach low temperatures and with flexible control), it provides a more comprehensive performance solution.

[0040] 4. Efficient and compact thermal management solution: Discharging the heat at the hot end of the TEC into the cold storage medium not only solves the heat dissipation problem of the TEC but also has a compact structure without the need for an additional complex heat dissipation system.

[0041] 5. Intelligent operation on demand: Through the intelligent management of the secondary refrigeration function by the control system, it realizes enabling on demand, effectively balancing the requirements of high performance and low energy consumption. Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a schematic structural diagram of a novel energy storage heat exchange system provided by an embodiment of the present invention.

[0044] Figure 2 It is a schematic cross-sectional view of a novel energy storage heat exchange system provided by an embodiment of the present invention.

[0045] Figure 3 It is another schematic cross-sectional view of a novel energy storage heat exchange system provided by an embodiment of the present invention.

[0046] Figure 4 It is a schematic cross-sectional view of a novel energy storage heat exchange system including a second heat exchange structure provided by an embodiment of the present invention.

[0047] Figure 5 It is a schematic structural diagram of a novel composite heat exchange system including a secondary refrigeration part in an embodiment of the present invention.

[0048] Figure 6 It is a schematic three-dimensional sectional view of a novel composite heat exchange system including a secondary refrigeration part in an embodiment of the present invention.

[0049] Figure 7 It is a schematic structural diagram of a novel energy storage vehicle refrigerator provided by an embodiment of the present invention.

[0050] Figure 8 It is a schematic structural diagram of a new type of composite heat exchange vehicle refrigerator provided by an embodiment of the present invention.

[0051] Figure 9 It is a schematic perspective partial sectional view of a new type of composite heat exchange vehicle refrigerator provided by an embodiment of the present invention.

[0052] Figure 10 It is a schematic flow chart of a new type of energy storage heat exchange system control method (without a secondary refrigeration unit) provided by an embodiment of the present invention.

[0053] Figure 11 It is a schematic flow chart of a new type of composite heat exchange system control method (with a secondary refrigeration unit) provided by an embodiment of the present invention.

[0054] Wherein:

[0055] 10. Energy storage body; 11. Housing; 111. Internal accommodation space; 12. Cold storage medium;

[0056] 20. Air duct system; 21. Air inlet channel; 22. Air outlet channel; 23. Cooling channel;

[0057] 30. Heat exchange part; 31. First heat exchange structure; 311. First heat exchange fin; 312. Cold source channel;

[0058] 32. Second heat exchange structure; 321. Second heat exchange fin; 33. Temperature control valve;

[0059] 40. Air guiding part; 41. Fan;

[0060] 50. Secondary refrigeration unit; 51. Semiconductor refrigeration element; 52. Heat dissipation structure; 521. Third heat exchange fin; 53. Cold dissipation structure; 531. Fourth heat exchange fin;

[0061] 100. Vehicle refrigerator; 110. Box body; 120. Storage space;

[0062] 130. Cold air inlet air duct;

[0063] 140. Vehicle refrigeration system; 141. Refrigerant compressor; 142. Condenser; 143. Evaporator; 144. Expansion valve; 145. Electromagnetic expansion valve; 146. Capillary tube; 147. Large-bore electromagnetic expansion valve;

[0064] TC. Actual temperature of the storage space; TS. Target set temperature; TX. Actual temperature of the energy storage body; TXb. Cold storage saturation temperature of the cold storage medium; TE. Ambient temperature; VH. High speed of the compressor; VL. Low speed of the compressor. Detailed implementation manners

[0065] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0066] In addition, the term "and / or" in the embodiments of the present invention is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after. Unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The present invention can solve at least some of the problems existing in the prior art in the cold storage system and the vehicle-mounted refrigerator, such as high energy consumption, limited cold preservation time after the vehicle stops, insufficient refrigeration depth, and insufficiently refined control strategies. Specifically, the technical problems to be solved by the present invention include:

[0068] 1. How to improve the efficiency of transferring the cold quantity of the cold source to the cold storage medium and the air inside the refrigerator.

[0069] 2. How to use the stored cold quantity for effective and long-term refrigeration after the vehicle stops.

[0070] 3. How to provide stronger refrigeration capacity when necessary to meet the needs such as deep freezing.

[0071] 4. How to achieve intelligent and efficient control according to factors such as the refrigerator temperature, cold storage state, environmental conditions, and vehicle operating state, and optimize energy utilization.

[0072] Embodiment 1: New energy storage heat exchange system

[0073] As Figure 1 and Figure 2 shown, this embodiment provides a new energy storage heat exchange system. The system mainly includes an energy storage body 10, an air duct system 20, a heat exchange part 30, and a wind guiding part 40.

[0074] The function of the energy storage body 10 is to absorb and store the cold energy from the cold source. The energy storage body 10 has a housing 11, and the housing 11 defines an internal accommodation space 111.

[0075] The housing 11 of the energy storage body 10 can use high-density rigid polyurethane foam as the thermal insulation layer, which has a low thermal conductivity and good structural strength. Preferably, the vacuum insulation panel (VIP) technology can be used to place the core material (such as glass fiber or fumed silica) in a high-barrier film and vacuum-packaged. Its thermal conductivity can reach 0.004 W / (m·K) or even lower, and its thermal insulation performance far exceeds that of traditional materials. It can greatly reduce the thickness of the thermal insulation layer under the same thermal insulation effect, thereby increasing the effective volume or reducing the overall size. The housing 11 needs to ensure good airtightness, especially for the case of filling the liquid or semi-solid cold storage medium 12.

[0076] The selection of the cold storage medium 12 depends on the required refrigeration temperature range of the car refrigerator. Generally, through the phase change process, the cold storage medium 12 can absorb or release a large amount of latent heat at a small temperature difference, so as to achieve efficient cold energy storage and release. Of course, a non-phase change cold storage liquid with a high specific heat capacity, such as an ethylene glycol aqueous solution, can also be used.

[0077] In some embodiments of the present invention, the cold storage medium 12 is a phase change material (PCM), such as an aqueous salt solution, an ethylene glycol solution, paraffin, or other organic / inorganic phase change materials that can undergo solid-liquid phase changes at different temperatures such as 0 °C, -5 °C, -10 °C, -15 °C, -20 °C, etc. The PCM can absorb or release a large amount of latent heat during the solid-liquid phase change process, has a very high energy storage density, and helps to maintain a stable low temperature for a long time at a specific temperature point.

[0078] The air duct system 20 is used to guide the air to flow through the energy storage body 10 for heat exchange. The air duct system 20 includes an air inlet channel 21, an air outlet channel 22, and a cooling channel 23. The air inlet channel 21 is provided with one or more air inlets for sucking air from the space to be cooled (such as the storage space of the car refrigerator). The air outlet channel 22 is provided with one or more air outlets for sending the cooled air back to the space to be cooled. The cooling channel 23 is the key part for air heat exchange. It penetrates through the internal accommodation space 111 of the energy storage body 10 and forms a sealed structure with the energy storage body 10, specifically the housing 11 in some embodiments of the present invention, to prevent the cold storage medium 12 from leaking into the air flow path. The two ends of the cooling channel 23 are respectively communicated with the air inlet channel 21 and the air outlet channel 22 to form a complete air inlet and outlet path.

[0079] The cross-sectional shape (circular, rectangular, flat) and the number of the cooling channels can be designed according to the required air volume and heat transfer area. Turbulence structures (such as corrugated walls, built-in small fins, etc.) can be arranged inside to enhance the turbulence on the air side and improve the heat transfer coefficient.

[0080] In some embodiments of the present invention, as Figure 2 shown, the cooling channel 23 can be designed as a tubular air duct, and the outer walls of these air ducts are in direct contact with the cold storage medium 12 inside the energy storage body 10. The material of the air duct should have good thermal conductivity, such as aluminum or copper. When air flows inside the air duct, heat exchange occurs between the air duct wall and the external cold storage medium 12.

[0081] In some alternative embodiments of the present invention, the cooling channel 23 can be one or more independent air ducts that pass through the cold storage medium 12. Air is forced to flow inside these air ducts, and heat exchange occurs between the wall of the air duct 23a and the external low-temperature cold storage medium 12.

[0082] As Figures 2 to 4 shown, the heat exchange part 30 is responsible for transferring the cold quantity of the cold source to the energy storage body 10 or directly to the air flowing through the cooling channel 23, or simultaneously transferring the cold quantity of the cold source to the energy storage body 10 and the air flowing through the cooling channel 23.

[0083] The heat exchange part 30 is connected to the refrigeration cycle of the cold source through a pipeline to receive a low-temperature and low-pressure cold source (such as R134a, R1234yf, etc.). The core of the heat exchange part 30 is the first heat exchange structure 31, which is arranged inside the energy storage body 10 and is in direct contact with the cold storage medium 12.

[0084] In some embodiments of the present invention, the heat exchange part 30 is an interface and channel that connects to the cold source and introduces cold quantity into the energy storage body 10. It includes a connecting pipeline (not shown) and a first heat exchange structure 31 arranged in the accommodation space inside the energy storage body 10 and in direct contact with the cold storage medium 12. One end of the connecting pipeline is connected to the low-pressure side of the cold source, and the other end is connected back to an appropriate position in the air conditioning system (for example, before the compressor suction port, passing through a gas-liquid separator as needed).

[0085] In some embodiments of the present invention, as Figure 3 shown, a specific form of the first heat exchange structure 31 is shown. The first heat exchange structure 31 can include at least one cold source channel 312 and at least one first heat exchange fin 311. The cold source channel 312 is used for flowing the cold source from the cold source. At least a part of this channel is immersed in the cold storage medium 12. The first heat exchange fin 311 is connected to the cold source channel 312 and extends into the cold storage medium 12. Its function is to greatly increase the heat exchange area between the cold source and the cold storage medium 12 and improve the cold storage efficiency. In this embodiment, the first heat exchange fin 311 can be designed into a corrugated shape, a fin shape or other complex shapes. More preferably, as Figure 3As shown, the first heat exchange fin 311 can be connected to the outer wall of the cooling channel 23 or the air duct of the cooling channel 23, while the cold source channel 312 can be arranged on the first heat exchange fin 311 or directly attached to the outer wall of the cooling channel 23. This structure enables the cold source flowing through the cold source channel 312 to not only transfer its cold quantity to the surrounding cold storage medium 12 efficiently through the first heat exchange fin 311 for cold storage, but also transfer a part of the cold quantity directly to the air flowing through the inside of the cooling channel 23 by contacting the outer wall of the cooling channel 23 (directly or indirectly through the second heat exchange fin), realizing the direct cooling of the air. This design combines the two methods of cold storage and direct cooling, improving the flexibility and response speed of the system.

[0086] The air guiding part 40 is used to generate an air flow and drive the air to complete the circulation in the air duct system 20. The air guiding part 40 is usually one or more fans 41. The fans 41 can be installed at different positions of the air duct system 20. For example, they can be installed at the air inlet to suck air into the system; or installed at the air outlet to blow out the cold air; or installed inside the cooling channel 23; or installed between the air inlet channel 21 and the cooling channel 23, or between the air outlet channel 22 and the cooling channel 23. The fans 41 of the air guiding part 40 should be vehicle-grade fans with low noise, long life, and low power consumption, such as DC brushless fans. Their air volume and air pressure need to be matched according to the resistance characteristics of the cooling channel 23 and the required heat exchange quantity. By adjusting the fan speed through methods such as PWM (pulse width modulation), more precise temperature control and energy saving can be achieved. The start / stop and speed of the fans 41 can be controlled by the control system described later.

[0087] The following uses the mode of being installed on a vehicle to elaborate on the principle, and the working principles of other usage scenarios are basically the same:

[0088] 1. Cold storage / direct refrigeration mode (air conditioner on): The vehicle air conditioning system works, and a low-temperature cold source is introduced into the cold source channel 312 of the heat exchange part 30. The cold quantity of the cold source is transferred to the cold storage medium 12 through the first heat exchange fin 311 and the channel wall, causing it to cool down and solidify (phase change cold storage). At the same time, if the air guiding part 40 (fan 41) is turned on, the air is driven to flow through the cooling channel 23. Since the first heat exchange structure 31 (especially when it is combined with the outer wall of the cooling channel 23) itself has a very low temperature, the air will directly exchange heat with it and be cooled when flowing through. In addition, the already partially cooled cold storage medium 12 also cools the air through the pipe wall of the cooling channel 23. The cooled air is sent out from the air outlet channel 22 to refrigerate the target space (such as the storage space of a refrigerator).

[0089] 2. Cold Release Mode (Air Conditioner Turned Off): The vehicle air conditioning system stops supplying the cold source to the heat exchange section 30. At this time, if the target space temperature is higher than the set value, the control system activates the air guiding section 40 (fan 41). Air is driven to flow through the cooling channel 23. Since the outer wall of the cooling channel 23 is in contact with the cold storage medium 12 that has stored cold, the air exchanges heat with the cold storage medium 12 through the pipe wall of the cooling channel 23, absorbs the cold released by the cold storage medium 12, and is cooled. The cooled air is sent out from the air outlet channel 22 to maintain the low temperature of the target space. This process can continue until the cold stored in the cold storage medium 12 is exhausted or the temperature rises to a certain extent.

[0090] Embodiment 2: A New Energy Storage Heat Exchange System with an Internal Heat Exchange Structure

[0091] This embodiment is an improvement based on Embodiment 1.

[0092] As Figure 4 shown, in order to further improve the direct cooling effect on air, especially when rapid cooling is required, a second heat exchange structure 32 can be added inside the cooling channel 23 (air duct). The second heat exchange structure 32 includes at least one second heat exchange fin 321, and these heat exchange fins are installed on the inner wall of the air duct and are in direct contact with the air flowing through the air duct, greatly increasing the contact area between the air and the cold source. The second heat exchange fin 321 can be in the form of fins, corrugated sheets, etc.

[0093] In some embodiments of the present invention, it is also possible to add the second heat exchange fin 321 as described above on the basis of the embodiments described in Figure 2 .

[0094] Embodiment 3: A New Energy Storage Heat Exchange System with a Temperature Control Valve

[0095] As Figure 1 and Figure 5 shown, in this embodiment, on the basis of Embodiment 1 or 2, in order to more precisely control the cold storage process and the cold source flow rate, a temperature control valve 33 is provided on the pipeline for introducing the cold source into the heat exchange section 30. The temperature control valve 33 can be an electromagnetic valve or an electronic expansion valve or other valves that can adjust the flow rate. This valve is connected to the control system described later. The control system can control the opening and closing or the opening degree of the temperature control valve 33 according to the temperature of the energy storage body 10 (measured, for example, by the second temperature sensor 132 installed on the energy storage body 10). For example, when the temperature of the energy storage body 10 is relatively high and cold storage is required, the valve is opened; when the temperature of the energy storage body 10 has reached the preset low temperature value (such as a certain temperature lower than the phase change point), indicating that the cold storage is sufficient, the valve can be closed or the opening degree can be reduced to stop or reduce the inflow of the cold source, avoiding waste of cold or overcooling. At the same time, it is also possible to cooperate with the vehicle operating state (such as the load of the air conditioning system, the battery state, etc.) to jointly control this valve.

[0096] Example 4: New Composite Heat Exchange System

[0097] As Figure 5 and Figure 6 shown, based on any one of Examples 1 to 3, this example adds a secondary refrigeration unit 50 to meet lower refrigeration temperature requirements (such as -18°C freezing) or enhance the refrigeration capacity under certain working conditions.

[0098] The core of the secondary refrigeration unit 50 is one or more thermoelectric cooling elements 51 (Peltier / TEC modules). After the thermoelectric cooling element 51 is powered on, one side (cold end) will absorb heat and refrigerate, and the other side (hot end) will generate heat.

[0099] The cold end of the secondary refrigeration unit 50 needs to be coupled with the object to be cooled. There are two main methods:

[0100] Method 1: The cold end is directly or through a heat conduction structure coupled to the energy storage body 10 to further cool the cold storage medium 12. This method can make the cold storage medium reach a lower temperature and store more cold, but the direct refrigeration effect on air is relatively indirect.

[0101] Method 2 (as Figure 5 and Figure 6 shown): The cold end is coupled to the air flow path of the air duct system 20. Specifically, a heat dissipation structure 53 can be set in the air duct system 20 (for example, inside the cooling channel 23 or at the air outlet channel 22), and the heat dissipation structure 53 is connected to the cold end of the thermoelectric cooling element 51. The heat dissipation structure 53 usually includes a plurality of fourth heat exchange fins 531 (such as finned radiators) to increase the heat exchange area between the cold end and the flowing air. When the thermoelectric cooling element 51 works, the cold generated at the cold end is efficiently transferred to the air through the fourth heat exchange fins 531 to achieve secondary deep refrigeration of the air flowing out of the cooling channel 23.

[0102] The heat generated at the hot end of the secondary refrigeration unit 50 must be effectively dissipated, otherwise it will affect the refrigeration effect of the cold end. For this reason, a heat dissipation structure 52 is set and connected to the hot end. For efficient heat dissipation, the heat dissipation structure 52 can be immersed in the cold storage medium 12 of the energy storage body 10. Utilize the large heat capacity of the cold storage medium 12 to absorb the heat generated at the hot end. This method has a compact structure and good heat dissipation effect when the temperature of the cold storage medium is relatively low. To further improve the heat dissipation efficiency, the heat dissipation structure 52 can include one or more third heat exchange fins 521 to increase the contact area between the hot end and the cold storage medium 12. Of course, the heat dissipation structure 52 can also use other methods to dissipate heat, such as through an independent air-cooling or water-cooling system, but this will increase the complexity of the system. Discharging the heat into the cold storage medium 12 is a relatively simple and can utilize existing components solution.

[0103] The start and stop of the thermoelectric cooler 51 in the secondary refrigeration unit 50 are controlled by the control system described later according to requirements. For example, when the user sets a very low temperature (such as -18°C), or the main refrigeration system (air-conditioning cold source + cold energy storage) cannot meet the cooling requirement, the controller 133 can start the thermoelectric cooler 51.

[0104] In some embodiments of the present invention, by changing the direction of the current, the cold end and the hot end of the thermoelectric cooler 51 are changed. At this time, the energy storage body 10 can store heat, and the hot air circulating in the air duct system 20, thereby extending the heat preservation time.

[0105] Embodiment 5: New energy storage vehicle refrigerator

[0106] As Figure 7 shown, this embodiment provides a new energy storage vehicle refrigerator 100, which integrates the new energy storage heat exchange system described in any one of Embodiments 1 to 3.

[0107] The vehicle refrigerator 100 includes a box body 110, which has good heat insulation performance (for example, using a foamed insulation layer), and defines a storage space 120 for storing items such as food and beverages.

[0108] The new energy storage heat exchange system (existing in the form of including the energy storage body 10, the air duct system 20, the heat exchange part 30, the air guiding part 40, and optionally including the temperature control valve 33) is installed on the box body 110. This can be to embed the entire system as a module into the refrigerator box body wall, or place some components (such as the energy storage body module) in a specific position or other devices. The key is that the air inlet and outlet of the air duct system 20 are both communicated with the storage space 120, so that the air guiding part 40 can drive the air in the storage space 120 to flow through the cooling channel 23 for cooling circulation. In some alternative embodiments of the present invention, the new energy storage heat exchange system is placed in the foamed insulation layer of the refrigerator.

[0109] The new energy storage vehicle refrigerator 100 also includes a control system. The control system is responsible for monitoring the state and controlling the operation of the new energy storage heat exchange system. The control system at least includes:

[0110] The first temperature sensor: installed in the storage space 120 (for example, on the inner wall of the inner container, or placed in the foamed layer near the inner container) to detect the actual temperature TC of the storage space 120.

[0111] The second temperature sensor: installed on or inside the energy storage body 10 to detect the temperature TX of the energy storage body 10, reflecting the temperature and cold storage state of the cold storage medium 12.

[0112] Controller: Usually a microcontroller (MCU) or a similar processor. It receives signals from the first temperature sensor and the second temperature sensor. The controller is also electrically connected to the air guiding part 40 (fan 41), and can control the start / stop and / or rotational speed of the fan. Based on the built-in control logic (see Embodiment 7), the controller decides when to turn on or off the fan 41 and adjust the rotational speed of the fan 41 according to the detected temperatures TC and TX and the target temperature TS set by the user.

[0113] Optionally, the control system may further include an ambient temperature sensor for detecting the ambient temperature outside the refrigerator, and this information can be used to optimize the control strategy, especially when controlling the secondary refrigeration part 50 (see Embodiment 6).

[0114] If the new energy storage heat exchange system is equipped with a temperature control valve 33, the controller is also electrically connected to the temperature control valve 33, and controls the opening / closing or opening degree of the temperature control valve 33 according to the detection result of TX and / or the vehicle operating state (such as whether it is necessary to preferentially meet the air conditioning or battery cooling), so as to intelligently manage the cold storage process.

[0115] In some embodiments of the present invention, the cold source comes from the vehicle-mounted refrigeration system 140. The returned low-pressure gaseous refrigerant is compressed by the compressor 141 to become a high-pressure gaseous refrigerant, and the high-pressure gaseous refrigerant flows into the condenser 142. In the condenser 142, the refrigerant exchanges heat with the outside air of the vehicle or the vehicle's cooling system, releases heat, and condenses into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant undergoes a sudden pressure drop through the temperature control valve 33 and becomes a low-temperature and low-pressure liquid-gas mixture. The low-temperature refrigerant enters the heat exchange part 30, transfers the cold quantity to the cold storage medium 12 or transfers it to the air in the cooling channel 23 through the second heat exchange fin 321, thereby evaporating into a low-pressure gas, and at the same time reducing the temperature of the cold storage medium 12 and / or the air in the cooling channel 23. Then the low-pressure gas returns to the compressor to repeat the above process, continuously providing a cold source for the new energy storage heat exchange system of the present invention.

[0116] In some embodiments of the present invention, the vehicle-mounted refrigeration system 140 further includes other circuits, such as a vehicle air conditioning cooling circuit and a battery cooling circuit. Usually, a cooling circuit includes an evaporator 143; an expansion valve 144 is arranged at one end of the evaporator 143, and the other end of the evaporator 144 can adopt a solenoid valve expansion valve 145 or a capillary tube 146.

[0117] To improve the temperature uniformity within the storage space 120, especially for upright or larger in-vehicle refrigerators, a cold air inlet duct 130 can be provided. This duct draws the cooled air from the outlet passage 22 of the duct system 20 and guides it to be sent out from the upper region of the storage space 120. Since cold air has a greater density, feeding it from the upper part helps to form a natural convection from top to bottom, making the temperature of the entire storage space 120 more uniform. To save the effective volume of the storage space 120, the cold air inlet duct 130 can be at least partially arranged between the outer wall of the box body 110 and the thermal insulation layer, or closely attached to the outer side of the inner liner of the storage space.

[0118] Embodiment 6: New composite heat exchange in-vehicle refrigerator

[0119] This embodiment provides a new composite heat exchange in-vehicle refrigerator, which integrates the new composite heat exchange system described in Embodiment 4.

[0120] As Figure 8 and Figure 9 shown, the cold source of the energy storage body 10 in this embodiment is the same as that in Embodiment 6, and the others are also roughly the same. The difference is that the low-pressure gas refrigerant flowing out of the evaporator 143 in the vehicle air conditioner cooling circuit and the battery cooling circuit converges and then returns to the compressor 141 after passing through a large-diameter electronic expansion valve 147. Of course, the method in Embodiment 6 can also be adopted. In some alternative embodiments of the present invention, the arrangement method of this embodiment can also be adopted in Embodiment 5.

[0121] Similar to Embodiment 5, the new composite heat exchange in-vehicle refrigerator provided in this embodiment also includes a control system. The control system in this embodiment is basically the same as the control system in Embodiment 5. The difference is that the controller in this embodiment is electrically connected to the semiconductor refrigeration element 51 and controls the start and stop of the semiconductor refrigeration element 51 according to the detection results of TC, TS, TX or even TE. For example, when TS is set to -18°C, or when TC is much higher than TS and the main refrigeration system is insufficiently effective, the semiconductor refrigeration element 51 is started.

[0122] In some embodiments of the present invention, a heating film is arranged inside the refrigerator for heating and insulating the refrigerator. At the same time, by changing the direction of the current, the cold end and the hot end of the semiconductor refrigeration element 51 are changed. At this time, the energy storage body 10 can store heat, and the hot air circulating in the duct system 20, thereby extending the heat preservation time of the refrigerator.

[0123] Embodiment 7: Control method without a semiconductor refrigeration module

[0124] This embodiment details the control method executed by the control system applied to the novel energy storage vehicle refrigerator 100 described in Embodiment 5. The core of this method lies in using a controller to intelligently coordinate the operating states of various components of the novel energy storage heat exchange system (such as the fan 41 of the air guiding part 40, the temperature control valve 33 of the heat exchange part 30, and the associated vehicle refrigeration system compressor) according to multiple parameters monitored in real time, so as to achieve efficient refrigeration, precise temperature control, and energy-saving operation.

[0125] Before elaborating on the control logic, first clarify the key parameters and state definitions involved in this method:

[0126] User-set target temperature TS: The temperature that the user expects the storage space 120 to reach, set through the vehicle refrigerator control panel or relevant interfaces.

[0127] Actual temperature TC of the storage space: The temperature value detected in real time by the first temperature sensor installed in the storage space 120.

[0128] Actual temperature TX of the energy storage body: The temperature value detected in real time by the second temperature sensor installed on or inside the energy storage body 10, reflecting the current temperature and cold storage state of the cold storage medium 12.

[0129] Cold storage saturation temperature TXb of the cold storage medium: The characteristic temperature point at which the cold storage medium 12 filled in the energy storage body 10 undergoes solid-liquid phase change (or specific energy absorption / release), which is a known design parameter determined according to the selected material.

[0130] Ambient temperature TE: As an optional setting in some embodiments of the present invention, the ambient temperature detected by the ambient temperature sensor installed outside the refrigerator.

[0131] Evaporator fan: Refers to the fan 41 in the air guiding part 40, which is responsible for driving the air to circulate between the storage space 120 and the cooling channel 23.

[0132] Electronic expansion valve / temperature control valve: Refers to the valve 33 (such as a small-diameter electronic expansion valve) in the heat exchange part 30 used to control the inflow of the cold source. Its opening indicates allowing the cold source to flow in, and its closing indicates blocking the cold source from flowing in.

[0133] Compressor: Refers to the compressor 141 of the vehicle refrigeration system 140. This control system indirectly controls the start-stop and operating speed of the compressor by sending request signals to relevant control units of the vehicle (such as the body control module BCM or the air conditioner controller).

[0134] Vehicle operating mode 1 (Mode 1): It indicates that in the current state of the vehicle, the evaporator of the on-vehicle refrigeration system is working (for example, cooling the passenger compartment) or the battery cooling system is working. In this mode, the compressor has an operating requirement and is usually allowed to operate at a high speed VH to provide sufficient cooling capacity.

[0135] Vehicle operating mode 2 (Mode 2): It indicates that in the current state of the vehicle, neither the on-vehicle air conditioner evaporator nor the battery cooling system is working (for example, the vehicle is only in the accessory power mode, the vehicle is turned off but the refrigerator remains running, or the air conditioner / battery cooling requirement has been met). In this mode, if the compressor is only running for the refrigerator, it usually requests to operate at a low speed VL to save energy, or requests to stop under specific conditions.

[0136] Control period t: The time interval for the controller to execute a complete state detection and decision-making logic, for example, set to 30 seconds. Of course, t can adopt calibrated or empirical values.

[0137] Fan start delay t2: The time to delay turning on the fan 41 after stopping the cold source supply under specific conditions (such as when both the refrigerator and the cold storage body reach the low-temperature target), for example, set to 60 seconds.

[0138] As Figure 10 shown, the control logic of the system without the secondary refrigeration unit (thermoelectric cooling module) will be described below.

[0139] This control logic is applicable to the new energy storage heat exchange system that only includes the main refrigeration unit (using the air conditioner cold source and the cold storage medium).

[0140] 1. System startup and initialization:

[0141] When the new energy storage on-vehicle refrigerator 100 is powered on and started, the controller first executes an internal self-check program. After the self-check passes, the system enters the initialization state: the controller ensures that the temperature control valve 33 is in the closed state to prevent the cold source from entering the heat exchange part 30; at the same time, the controller ensures that the fan 41 of the air guide part 40 is in the stopped state.

[0142] 2. Periodic state monitoring and decision-making:

[0143] After the initialization is completed, the controller enters the main control loop. It will perform the following operations once every preset control period t (for example, every 30 seconds):

[0144] Read the value of the first temperature sensor to obtain the actual temperature TC of the current storage space.

[0145] Read the value of the second temperature sensor to obtain the actual temperature TX of the current energy storage body.

[0146] If it is necessary to cooperate with the compressor, query the vehicle status to determine whether it is currently in working mode 1 or working mode 2.

[0147] Make a decision based on the read temperature value, the target temperature TS set by the user, and the known cold storage saturation temperature TXb of the cold storage medium.

[0148] 3. Refrigeration demand judgment and execution:

[0149] The controller first determines whether the storage space 120 needs refrigeration. The determination condition is: TC > the first temperature threshold, generally the first temperature threshold is TS + ΔT1. For example, TC > TS + 2°C; ΔT1 can be calibrated or an empirical value can be used.

[0150] If this condition is met, it indicates that the refrigerator needs to be cooled urgently. The controller will perform the following actions:

[0151] Command the temperature control valve 33 to open, allowing the cold source of the cold source to flow into the heat exchange part 30.

[0152] Command the fan 41 to start, forcing air to flow through the cooling channel 23 for cooling and sending the cold air into the storage space 120.

[0153] Send a compressor start request signal to the vehicle control unit.

[0154] According to the current vehicle working mode, further send a compressor speed request: if in mode 1, request the compressor to run at a high speed VH; if in mode 2, request the compressor to run at a low speed VL.

[0155] After performing the above actions, the process returns to step 2 (periodic status monitoring) and waits for the next control cycle.

[0156] 4. Judgment and execution when the temperature reaches the standard but continued cold storage is required:

[0157] If in step 3, TC ≤ the first temperature threshold, for example, TC ≤ TS + 2°C, then the controller enters the next judgment branch. The determination conditions are: TC < the second temperature threshold, generally the second temperature threshold is TS - ΔT2, for example, TC < TS - 2°C and TX > the third temperature threshold, generally the third temperature threshold is TXb + ΔT3, for example, TX > TXb + 2°C. ΔT2 and ΔT3 can be calibrated or empirical values can be used.

[0158] This condition indicates that the temperature of the storage space is low enough, but the cold storage medium has not fully stored cold energy. In order to prioritize the cold storage task and avoid the storage space from being overcooled, the controller performs the following actions:

[0159] Command the fan 41 to stop, preventing cold air from continuing to blow into the storage space.

[0160] Keep the temperature control valve 33 open (or send a signal to ensure it remains open), allowing the cold source to continue flowing through the heat exchange section 30 to cool and store energy in the cold storage medium 12. At this time, the compressor (if it has been running) continues to operate.

[0161] After performing the above actions, the process returns to step 2 (periodic status monitoring).

[0162] 5. Temperature and cold storage compliance judgment and execution:

[0163] If the conditions are not met in step 4, the controller enters the final main judgment branch. The judgment conditions are: TC < the second temperature threshold, for example, TC < TS - 2°C and TX < the fourth temperature threshold, generally the fourth temperature threshold is TXb – ΔT4, for example, TX < TXb - 2°C. ΔT4 can be calibrated or an empirical value can be used.

[0164] This condition indicates that both the refrigeration and cold storage targets have been achieved. The controller performs the following actions:

[0165] Command the temperature control valve 33 to close and stop the cold source supply.

[0166] Wait for a preset delay time t2 (for example, 60 seconds). This delay may be used for system pressure balance, reducing frequent component switching, or providing time for potential micro defrosting.

[0167] After the delay ends, command the fan 41 to start. At this time, the purpose of the fan running is to release the cold stored in the energy storage body 10 to maintain the low temperature of the storage space, or simply to circulate the air to equalize the temperature.

[0168] In some embodiments of the present invention, optional compressor cooperation: Check the vehicle working mode: If the current mode is mode 2, the controller sends a compressor shutdown request signal to the vehicle control unit to save energy. If in mode 1, no shutdown signal is sent because the compressor may be serving other systems.

[0169] After performing the above actions, the process returns to step 2 (periodic status monitoring).

[0170] Other cases:

[0171] If the main judgment conditions in the above steps 3, 4, and 5 are not met (for example, TC fluctuates within the range of TS ± 2°C, or TX is within the range of TXb ± 2°C), the controller does not perform special active control actions, but only maintains the current state (for example, if the fan is running, it continues to run, and if the valve is closed, it remains closed), and then directly returns to step 2 to wait for the next cycle of status monitoring and decision-making.

[0172] Example 8: Control Method of a Semiconductor Refrigeration Module

[0173] As Figure 11 shown, this example details the control method executed by the control system of the new composite heat exchange vehicle refrigerator described in Example 6. The core of this method lies in using the controller to intelligently coordinate the working states of the components of the new composite heat exchange system (such as the fan 41 of the air guiding part 40, the temperature control valve 33 of the heat exchange part 30, the semiconductor refrigeration element 51 of the secondary refrigeration part 50, and the associated vehicle refrigeration system compressor) based on multiple parameters monitored in real time, so as to achieve efficient refrigeration, precise temperature control, and energy-saving operation.

[0174] The key parameters and state definitions involved in the method of this example are increased compared with Example 7:

[0175] Semiconductor refrigeration module (TEC): Refers to the semiconductor refrigeration element 51 in the secondary refrigeration part 50.

[0176] This control logic is applicable to the new composite heat exchange system that simultaneously includes the main refrigeration part and the secondary refrigeration part (TEC). Based on the logic of Example 7, it adds the control of the semiconductor refrigeration element 51.

[0177] 1. System startup and initialization:

[0178] Similar to the logic of Example 7, but during initialization, in addition to closing the valve 33 and the fan 41, the controller also ensures that the semiconductor refrigeration element 51 is in a powered-off (closed) state.

[0179] 2. Periodic state monitoring and decision-making:

[0180] Similar to the logic of Example 7, but when reading the sensor data, if an ambient temperature sensor is equipped, the value TE of the ambient temperature sensor will also be read.

[0181] 3. Refrigeration demand judgment and execution:

[0182] The judgment condition is the same as in Logic 1: TC > the first temperature threshold. Generally, the first temperature threshold is TS + ΔT1. For example, TC > TS + 2°C; ΔT1 can be calibrated or an empirical value can be used.

[0183] If this condition is met, it indicates that strong refrigeration is required. The controller performs the following actions:

[0184] Command the temperature control valve 33 to open.

[0185] Command the fan 41 to start.

[0186] Command the semiconductor refrigeration element 51 to start working to provide additional secondary refrigeration capacity.

[0187] Send a compressor start and speed request signal (judging VH / VL based on Mode 1 / Mode 2), with the same logic as in Embodiment 7.

[0188] The process returns to Step 2.

[0189] 4. Judgment and execution for temperature reaching the standard but still needing to continue cold storage:

[0190] The judgment conditions are the same as the logic in Embodiment 7: TC < the second temperature threshold, generally the second temperature threshold is TS - ΔT2. For example, TC < TS - 2°C and TX > the third temperature threshold, generally the third temperature threshold is TXb + ΔT3. For example, TX > TXb + 2°C. ΔT2 and ΔT3 can be calibrated or empirical values can be used.

[0191] The temperature of the storage space has reached the standard, and cold storage needs to be prioritized. The controller performs the following actions:

[0192] Command the fan 41 to stop.

[0193] Command the thermoelectric cooler 51 to stop working because secondary refrigeration is not required at this time.

[0194] Keep the temperature control valve 33 in the open state and continue cold storage.

[0195] The process returns to Step 2.

[0196] 5. Judgment and execution for both temperature and cold storage reaching the standard:

[0197] The judgment conditions are the same as the logic in Embodiment 7: TC < the second temperature threshold, for example, TC < TS - 2°C and TX < the fourth temperature threshold, generally the fourth temperature threshold is TXb - ΔT3. For example, TX < TXb - 2°C. ΔT4 can be calibrated or empirical values can be used.

[0198] Both refrigeration and cold storage are sufficient. The controller performs the following action sequence:

[0199] Command the temperature control valve 33 to close and stop the cold source supply of the main refrigeration unit.

[0200] Check the ambient temperature TE. If TE > the preset ambient temperature, for example, 38°C (i.e., the ambient temperature is very high), then command the thermoelectric cooler 51 to start working. This is to use the TEC to help maintain the low temperature and counteract the external heat penetration in an extremely high temperature environment. Otherwise (i.e., TE ≤ the preset ambient temperature, for example, 38°C), then command the thermoelectric cooler 51 to stop working (or remain in the stopped state).

[0201] Wait for the preset delay time t2, for example, 60 seconds. Of course, t2 can be calibrated or empirical values can be used.

[0202] After the delay ends, command the fan 41 to start (using the cold energy generated by cold storage or TEC to maintain a low temperature).

[0203] In some embodiments of the present invention, the optional compressor cooperation is as follows: Check the vehicle working mode: If it is in Mode 2, send a compressor shutdown request signal.

[0204] The process returns to Step 2.

[0205] 6. Other situations:

[0206] Following the logic of Embodiment 7, if the specific conditions of Steps 3, 4, and 5 are not met, maintain the current state and return to Step 2 to wait for the next monitoring.

[0207] Through the above detailed control logic, the control system of the present invention can intelligently and flexibly schedule the operation of the main refrigeration system (air-conditioning refrigerant + cold storage) and the secondary refrigeration system (TEC) according to the real-time changing internal temperature, cold storage state, environmental conditions, and vehicle state, as well as coordinate the interaction with the vehicle compressor. Thus, on the premise of ensuring the refrigeration effect, the optimal utilization of energy is achieved, and the user's requirements for precise temperature control and long-term cold preservation are met. This method has a higher level of intelligence and energy efficiency performance compared to simple on-off control.

[0208] Embodiment 9: Electronic device

[0209] The present invention also provides an electronic device, such as a controller integrated inside a vehicle refrigerator. The electronic device includes a processor (such as an MCU) and a memory (such as Flash, RAM). A computer program (firmware) is stored in the memory. When the processor executes this computer program, it can implement any one of the control methods described in Embodiment 7 or 8 above. For example, the processor receives signals from various sensors, makes judgments according to the logic set in the program (such as Figure 10 or Figure 11 the shown process), and outputs control signals to the fan 41, the temperature control valve 33, the optional semiconductor refrigeration component 51, and the compressor control unit of the vehicle.

[0210] The processor may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0211] The memory may include a Random Access Memory (RAM), or may also include a Non-Volatile Memory (NVM), such as at least one disk memory.

[0212] The memory may be a volatile memory, such as a random-access memory (RAM); the memory may also be a non-volatile memory, such as a read-only memory, a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD), or the memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may be a combination of the above memories.

[0213] Embodiment 10: Storage Medium

[0214] The present invention provides a computer-readable storage medium, such as a non-volatile memory chip (Flash Memory), an SD card, a USB flash drive, etc. The computer-readable storage medium stores a computer program, and when the program is loaded and executed by a corresponding processor (such as a controller of a vehicle-mounted refrigerator or a general-purpose computer), it can implement any one of the control methods described in Embodiment 7 or 8 above. Such a storage medium can be used to manufacture or update the control software of a vehicle-mounted refrigerator.

[0215] The present invention can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that the computer can access, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid-state disk (SSD)).

[0216] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0217] 1. High-efficiency heat exchange and cold storage: Through the carefully designed cooling channels, the first heat exchange structure (including heat exchange fins and cold source channels), and the optional second heat exchange structure, the efficient transfer of the cold quantity of the cold source to the cold storage medium and air is realized, improving the cold storage speed and refrigeration efficiency.

[0218] 2. Extended off-line cold preservation time: By utilizing the cold quantity stored in the cold storage medium, after the vehicle engine is turned off or the air conditioner is closed, the air can still be driven by the air guiding part to flow through the cooling channels for refrigeration, significantly extending the effective cold preservation time of the vehicle-mounted refrigerator.

[0219] 3. Enhanced refrigeration capacity: The optional secondary refrigeration part (thermoelectric cooler) can provide additional refrigeration quantity when needed, achieving a lower refrigeration temperature (such as freezing at -18°C), meeting the diverse needs of users.

[0220] 4. Intelligent control and energy saving: By integrating temperature sensors and controllers and adopting refined control logic, it is possible to intelligently control the working states of the fan, temperature control valve, secondary refrigeration component, and compressor according to various factors such as the refrigerator temperature, cold storage state, set temperature, vehicle operation mode, and even ambient temperature, realizing on-demand refrigeration and cold storage, optimizing energy utilization, and achieving the purpose of energy saving.

[0221] 5. High system integration: The cold storage, heat exchange, air duct, etc. are integrated in a compact module, which is convenient for installation and layout in vehicles, vehicle-mounted refrigerators or other devices.

[0222] 6. Improve the temperature uniformity inside the box: The optional cold air inlet duct design helps to optimize the distribution of cold air in the refrigerator and improve the temperature uniformity.

[0223] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. For example, the shape of the energy storage body, the number and arrangement form of the cooling channels, the specific structure of the heat exchange fins, the type and installation position of the sensors, the specific threshold and time parameters in the control logic, etc. can all be adjusted and optimized under the basic principle of the present invention.

Claims

1. A new type of composite heat exchange system, characterized in that: include: The main refrigeration unit is suitable for utilizing a cold source for refrigeration and / or cold storage, and the main refrigeration unit comprises: An energy storage body, used to absorb and store the cold energy transmitted by the cold source, the energy storage body comprising a shell and an internal cold storage medium; An air duct system, having at least one cooling channel penetrating the energy storage body, for guiding air to exchange heat with the energy storage body; A heat exchange part, connected to the cold source and adapted to transfer the cold energy of the cold source to the energy storage body and / or the air flowing through the cooling channel; An air guide portion, used for driving air to flow through the air duct system; A secondary refrigeration unit is used to provide supplementary or deep refrigeration, and the secondary refrigeration unit includes: The semiconductor refrigeration element has a cold end and a hot end; the cold end is coupled to the air flow path of the air duct system or the energy storage body, and is used to perform secondary refrigeration on the air flowing through the air duct system or to cool the cold storage medium.

2. The novel composite heat exchange system according to claim 1 is characterized in that: It also includes a heat dissipation structure connected to the hot end of the semiconductor refrigeration element, and the heat dissipation structure is immersed in the cold storage medium of the energy storage body.

3. The novel composite heat exchange system according to claim 2 is characterized in that: The heat dissipation structure includes at least one third heat exchange plate for increasing the heat exchange area between the hot end and the cold storage medium.

4. The novel composite heat exchange system according to claim 1 is characterized in that: The secondary refrigeration unit further includes a cooling structure located in the air flow path of the air duct system, and the cooling structure is connected to the cold end of the semiconductor refrigeration element.

5. The novel composite heat exchange system according to claim 4 is characterized in that: The cooling structure includes at least one fourth heat exchange fin for increasing the heat exchange area between the cold end and the air.

6. The novel composite heat exchange system according to claim 1 is characterized in that: The cooling channel includes at least one air duct; the heat exchange part is also provided with a second heat exchange structure located inside the air duct, and the second heat exchange structure includes at least one second heat exchange plate for increasing the heat exchange area between the air flowing through the air duct and the cold source.

7. The novel composite heat exchange system according to any one of claims 1 to 6, characterized in that: The heat exchange portion includes a first heat exchange structure in contact with the cold storage medium, and the first heat exchange structure includes a cold source channel through which the cold source flows.

8. The novel composite heat exchange system according to claim 7 is characterized in that: The first heat exchange structure further includes a first heat exchange plate for increasing a heat exchange area between the cold source and the cold storage medium.

9. The novel composite heat exchange system according to claim 7 is characterized in that: The heat exchange part further includes a temperature control valve, which is arranged on a pipeline that introduces the cold source into the heat exchange part and is used to adjust the flow rate of the cold source flowing in.

10. The novel composite heat exchange system according to claim 8 or 9, characterized in that: The air guiding portion includes a fan.

11. A novel control method for a composite heat exchange system, characterized in that: The composite heat exchange system comprises an energy storage body, a heat exchange part connected to a cold source and an air guide part for driving air to flow through the energy storage body for heat exchange, and a secondary refrigeration part composed of a semiconductor refrigeration element; the energy storage body comprises a shell having an internal accommodation space and a cold storage medium filled in the internal accommodation space; the control method comprises the following steps: Obtaining the actual temperature TC in the storage space served by the cold storage system and the target temperature TS set by the user; Acquire the actual temperature TX of the energy storage body and the cold storage saturation temperature TXb of the cold storage medium; According to the comparison result between the actual temperature TC and the target temperature TS, and the comparison result between the actual temperature TX and the cold storage saturation temperature TXb, the operation state of the air guide part and the interaction state between the heat exchange part and the cold source are controlled; The start and stop of the semiconductor refrigeration element is controlled according to the comparison result between the actual temperature TC and the target temperature TS, and / or the comparison result between the actual temperature TX and the cold storage saturation temperature TXb.

12. The control method according to claim 11, characterized in that: The step of controlling the start and stop of the semiconductor refrigeration element comprises: When it is detected that the actual temperature TC is greater than the first temperature threshold, the semiconductor refrigeration element is turned on.

13. The control method according to claim 12, characterized in that: The step of controlling the start and stop of the semiconductor refrigeration element also includes: When it is detected that the actual temperature TC is lower than the second temperature threshold and the actual temperature TX is higher than the third temperature threshold, the semiconductor refrigeration element is turned off.

14. The control method according to claim 12 or 13, characterized in that: The step of controlling the start and stop of the semiconductor refrigeration element also includes: When it is detected that the actual temperature TC is less than the second temperature threshold and the actual temperature TX is less than the fourth temperature threshold, the ambient temperature TE is obtained. If the ambient temperature TE is greater than the preset ambient temperature, the semiconductor refrigeration element is turned on, otherwise the semiconductor refrigeration element is turned off.

15. The control method according to claim 11, characterized in that: The step of controlling the operating state of the air guide portion and the interaction state between the heat exchange portion and the cold source comprises: When it is detected that the actual temperature TC is greater than a first temperature threshold determined based on the target temperature TS, the air guide portion is turned on, and the heat exchange portion receives cold energy from the cold source.

16. The control method according to claim 15, characterized in that: The step of controlling the operating state of the air guide portion and the interaction state between the heat exchange portion and the cold source further includes: When it is detected that the actual temperature TC is lower than a second temperature threshold determined based on the target temperature TS, and the actual temperature TX is higher than a third temperature threshold determined based on the cold storage saturation temperature TXb, the air guide portion is closed, and the heat exchange portion is maintained in a state of receiving cold from the cold source to prioritize cold storage.

17. The control method according to claim 16, characterized in that: The step of controlling the operating state of the air guide portion and the interaction state between the heat exchange portion and the cold source further includes: When it is detected that the actual temperature TC is lower than the second temperature threshold and the actual temperature TX is lower than a fourth temperature threshold determined based on the cold storage saturation temperature TXb, the heat exchange unit is stopped from receiving cold from the cold source, and the air guide unit is opened after a preset delay time.

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