A thermoelectric refrigeration device

Abstract

The present invention discloses a thermoelectric refrigeration device, comprising a thermoelectric refrigerator, and further comprising a plurality of evaporators arranged in series and fixed to a hot end plate of the thermoelectric refrigerator, a liquid inlet pipe equipped with a working fluid pump and connected to the evaporator at the head end, a liquid return pipe connected to the liquid inlet pipe, and a condenser having one end connected to the exhaust pipes of all the evaporators and the other end connected to the liquid return pipe. Driven by the working fluid pump, liquid working fluid flows into each evaporator in sequence through the liquid inlet pipe, absorbs heat released by the hot end plate in the evaporator, and turns into a gas-liquid two-phase working fluid. The gaseous working fluid separated from the gas-liquid two-phase working fluid is gathered in the exhaust pipe and condensed into a liquid working fluid in the condenser, and then flows back to the liquid return pipe. The liquid working fluid circulates between the evaporator and the condenser, and during the circulation process, it carries away the heat released by the hot end plate of the thermoelectric refrigerator by undergoing a gas-liquid phase change. The gas-liquid phase change has a higher thermal efficiency and can effectively reduce the temperature of the hot end plate, thereby improving the cooling efficiency of the thermoelectric refrigerator.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of thermoelectric coolers, and in particular to a thermoelectric cooler. Background Art

[0002] The thermoelectric element of a thermoelectric cooler is made of two different semiconductor materials connected in series. Utilizing the Peltier effect of the semiconductor material, when a low DC voltage is applied to both ends of the thermoelectric element, heat will flow from one end of the thermoelectric element to the other, causing one end to release heat and lower its temperature, while the other end absorbs heat and raises its temperature. It does not require mechanical units such as compressors required by traditional refrigeration structures and has a wide range of applications, such as small refrigerators for storing picnic items and drinks, or precision temperature control systems for electrical conductors or aircraft.

[0003] During normal operation, a thermoelectric cooler forms a cold junction and a hot junction. Heat generated by the hot junction needs to be dissipated promptly to maintain a relatively stable temperature. If the hot junction generates a large amount of heat and is not dissipated promptly, the hot junction temperature will rise, reducing the device's cooling efficiency or even rendering it ineffective. Dissipating heat from the hot junction and minimizing the temperature difference between the hot junctions is an effective way to improve the cooling efficiency of thermoelectric coolers.

[0004] There are two main methods for heat dissipation at the hot end: profile air cooling and liquid cooling. However, both methods are single-phase, utilizing the sensible heat of the working fluid for heat exchange. The heat transfer efficiency of single-phase heat exchange depends on parameters such as fluid velocity, heat transfer area, heat transfer temperature difference, and the thermophysical properties of the working fluid. For high-power or high-heat-flux thermoelectric cooling applications, these parameters are difficult to improve beyond their upper limits, resulting in relatively poor heat transfer efficiency and impacting the cooling efficiency of the thermoelectric cooler. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a thermoelectric refrigeration device. Driven by a working fluid pump, the liquid working fluid circulates between the evaporator and the condenser, and during the circulation process, the heat released by the hot end plate of the thermoelectric refrigerator is taken away by a gas-liquid phase change. The gas-liquid phase change has a higher thermal efficiency and can improve the cooling efficiency of the thermoelectric refrigerator.

[0006] The thermoelectric refrigeration device provided by the present invention includes a thermoelectric cooler and further includes:

[0007] A plurality of evaporators arranged in series and fixed to the hot end plate of the thermoelectric cooler;

[0008] A liquid inlet pipe is provided with a working fluid pump and is connected to the evaporator at the head end;

[0009] a liquid return pipe connected to the liquid inlet pipe;

[0010] A condenser connected to the exhaust pipes of all evaporators at one end and to the liquid return pipe at the other end;

[0011] Driven by the working fluid pump, the liquid working fluid flows into each evaporator in sequence through the liquid inlet pipe, absorbs the heat released by the hot end plate in the evaporator and turns into a gas-liquid two-phase working fluid. The gaseous working fluid separated from the gas-liquid two-phase working fluid is gathered in the condenser through the exhaust pipe, condensed into liquid working fluid, and then returned to the return liquid pipe.

[0012] Preferably, each evaporator is provided with a closed evaporation chamber, and a plurality of evenly distributed heat exchange fins are fixed in the evaporation chamber.

[0013] Preferably, it further comprises a support plate which is detachably connected to the hot end plate and is used to support all evaporators, and heat dissipation grease is applied on two opposite sides of the support plate.

[0014] Preferably, it further comprises a liquid storage tank connected to the liquid return pipe, and the working fluid pump is connected to the liquid storage tank via the liquid supply pipe.

[0015] Preferably, it further comprises an air delivery pipe having one end connected to the condenser and connected to the exhaust pipes of all evaporators, and the air delivery pipe is provided with a mixer for mixing gas-liquid two-phase working medium.

[0016] Preferably, the evaporator at the end is connected to the mixer via a mixing pipe.

[0017] Preferably, the condenser includes a plurality of heat dissipation channels arranged in parallel and an air collecting chamber connected to all the heat dissipation channels. The air collecting chamber is fixed with a plurality of flow equalizing plates for guiding the gaseous working medium into the heat dissipation channels from bottom to top. The air vents provided on all the flow equalizing plates are coaxially connected, and the apertures of all the air vents gradually decrease from bottom to top.

[0018] Preferably, the condenser further comprises a liquid collecting chamber connected to one end of all the heat dissipation channels away from the gas collecting chamber, and both ends of all the heat dissipation channels extend and are inserted into the gas collecting chamber and the liquid collecting chamber respectively.

[0019] Preferably, heat dissipation fins are fixedly provided in parallel between any two adjacent heat dissipation channels.

[0020] Preferably, the device further comprises a heat dissipation fan provided on at least one side of the condenser.

[0021] Compared with the background technology, the thermoelectric refrigeration device provided by the present invention includes a thermoelectric refrigerator, and also includes several evaporators, liquid inlet pipes, liquid return pipes and condensers. The several evaporators are fixed on the hot end plate of the thermoelectric refrigerator. The several evaporators are arranged in series, the evaporator at the head end is connected to the liquid inlet pipe, one end of the condenser is connected to the exhaust pipes of all evaporators and the other end is connected to the liquid return pipe.

[0022] When the working fluid pump is started, the liquid working fluid flows into each evaporator in sequence through the liquid inlet pipe under the drive of the working fluid pump. When the temperature of the hot end plate is too high, the liquid working fluid in each evaporator absorbs the heat released by the hot end plate and turns into a gas-liquid two-phase working fluid. The gaseous working fluid in each evaporator is gathered into the condenser through the exhaust pipe. The gaseous working fluid releases heat after heat exchange with the cold air in the condenser. The gaseous working fluid condenses into liquid working fluid and then flows back to the return pipe. The return pipe is connected to the liquid inlet pipe. The liquid working fluid circulates between the evaporator and the condenser, and takes away the heat released by the hot end plate of the thermoelectric cooler by gas-liquid phase change during the circulation process. Compared with the existing single-phase heat exchange method, the gas-liquid phase change heat efficiency of the liquid working fluid in the present invention is higher, which can effectively reduce the temperature of the hot end plate, thereby improving the cooling efficiency of the thermoelectric cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A structural diagram of a thermoelectric refrigeration device provided in a specific embodiment of the present invention;

[0025] Figure 2 for Figure 1 Structural diagram of the thermoelectric cooler;

[0026] Figure 3 for Figure 1 Assembly drawings of the evaporators, liquid inlet pipes, liquid storage tanks and liquid return pipes;

[0027] Figure 4 for Figure 1 The structural diagram of one of the evaporators;

[0028] Figure 5 for Figure 4 Internal structure diagram of the evaporator;

[0029] Figure 6 for Figure 5 AA section view;

[0030] Figure 7 for Figure 4 Another internal structure diagram of the evaporator;

[0031] Figure 8 for Figure 1 Structural diagram of the middle condenser;

[0032] Figure 9 for Figure 8 A top view of

[0033] Figure 10 for Figure 9 BB cross-sectional view;

[0034] Figure 11 for Figure 10 A partial enlarged view of C in the middle.

[0035] The reference numerals are as follows:

[0036] Hot end plate 01, cold end plate 02 and refrigeration element 03;

[0037] Working fluid pump 11, liquid inlet pipe 12, evaporator 13, liquid delivery pipe 14, gas delivery pipe 15, mixer 16, liquid mixing pipe 17, condenser 18, liquid return pipe 19, liquid storage tank 20, liquid supply pipe 21, cooling fan 22 and support plate 23;

[0038] Exhaust pipe 130, liquid inlet 131, liquid outlet 132, exhaust port 133, evaporation chamber 134 and heat exchange fins 135;

[0039] Gas collecting chamber 181 , flow balancing plate 182 , vents 183 , heat dissipation channels 184 , heat dissipation fins 185 and liquid collecting chamber 186 . DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Please refer to Figures 1 to 11 , Figure 1 A structural diagram of a thermoelectric refrigeration device provided in a specific embodiment of the present invention; Figure 2 for Figure 1 Structural diagram of the thermoelectric cooler; Figure 3 for Figure 1 Assembly drawings of the evaporators, liquid inlet pipes, liquid storage tanks and liquid return pipes; Figure 4 for Figure 1 The structural diagram of one of the evaporators; Figure 5 for Figure 4 Internal structure diagram of the evaporator; Figure 6 for Figure 5 AA sectional view; Figure 7 for Figure 4 Another internal structure diagram of the evaporator; Figure 8 for Figure 1 Structural diagram of the middle condenser; Figure 9 for Figure 8 A top view of Figure 10 for Figure 9 BB cross-sectional view; Figure 11 for Figure 10 A partial enlarged view of C in the middle.

[0043] First, the thermoelectric cooler of the present invention comprises a hot end plate 01, a cold end plate 02, and a cooling element 03 disposed between the hot and cold end plates 01 and 02. Cooling element 03 is composed of P-type and N-type semiconductors arranged in a periodic pattern, with all P-type and N-type semiconductors facing the same side of the hot end plate 01 and the cold end plate 02 also facing the same side. When DC current is applied to cooling element 03, it produces a Peltier effect, causing the hot end plate 01 to absorb heat and the cold end plate 02 to release heat to a lower temperature.

[0044] The embodiment of the present invention discloses a thermoelectric refrigeration device, which includes a plurality of evaporators 13 , a liquid inlet pipe 12 , a liquid return pipe 19 and a condenser 18 .

[0045] Several evaporators 13 are arranged in series to facilitate the sequential flow of liquid working fluid into each evaporator 13. Each evaporator 13 includes a liquid inlet 131, a liquid outlet 132, and an exhaust port 133. The liquid inlet 131 of one evaporator 13 is connected to the liquid outlet 132 of the adjacent evaporator 13 via a liquid infusion pipe 14, so that all evaporators 13 are connected in series.

[0046] Each evaporator 13 is a rectangular plate-shaped structure with a hollow center. Each evaporator 13 is provided with a closed evaporation chamber 134, which stores a working fluid. The state of the working fluid can change according to the amount of heat absorbed. When the temperature of the hot end plate 01 is low, the working fluid absorbs less heat, and the working fluid in the evaporation chamber 134 is in liquid state. When the temperature of the hot end plate 01 is relatively high, the working fluid absorbs more heat, and the working fluid in the evaporation chamber 134 is converted from liquid to gas-liquid two-phase. When the temperature of the hot end plate 01 is high, the gas-liquid two-phase working fluid continues to absorb more heat, the dryness of the working fluid increases, and a large amount of gaseous working fluid is separated from the gas-liquid two-phase working fluid.

[0047] It should also be noted that the selection of the working fluid should be based on the saturated vapor pressure, latent heat of vaporization, safety and stability of the system operation, and combined with the working environment temperature of the system. The working fluids in this article include but are not limited to carbon dioxide, tetrafluoroethane or liquid ammonia.

[0048] The liquid inlet 131 and the liquid outlet 132 are respectively arranged on the side of the evaporator 13, and can be on the same side or different sides, which is specifically adjusted according to the distribution method of the evaporator 13. The liquid inlet 131 and the liquid outlet 132 are connected through the evaporation chamber 134 to ensure that the liquid working medium flows through the evaporation chamber 134. A number of evenly distributed heat exchange fins 135 are fixed in the evaporation chamber 134 to enhance the heat exchange efficiency between the liquid working medium and the hot end plate 01, which is beneficial to improving the cooling efficiency of the thermoelectric refrigerator. The heat exchange fins 135 are preferably arranged on the side of the evaporation chamber 134 close to the hot end plate 01, and all the heat exchange fins 135 are distributed in rows, and the heat exchange fins 135 in two adjacent rows are staggered to ensure that the temperature of the liquid working medium in the evaporation chamber 134 is uniform, which is also beneficial to improving the heat exchange efficiency. The heat exchange fins 135 can be specifically diamond-shaped protrusions, rectangular protrusions or other types of structures, which are not specifically limited here.

[0049] All evaporators 13 are fixed to the hot end plate 01 of the thermoelectric cooler to absorb the heat released by the hot end plate 01 of the thermoelectric cooler. Specifically, the hot end plate 01 of the thermoelectric cooler is fixed with eight evaporators 13, namely the first evaporator 13, the second evaporator 13, the third evaporator 13, the fourth evaporator 13, the fifth evaporator 13, the sixth evaporator 13, the seventh evaporator 13 and the eighth evaporator 13. All evaporators 13 are preferably U-shaped, so that the layout of the evaporators 13 is more compact and easy to meet the lightweight requirements. Of course, all evaporators 13 can also be linearly distributed, U-shaped, S-shaped, M-shaped, or other similar distribution methods. The number and distribution method of the evaporators 13 can be adaptively adjusted according to the specifications of the thermoelectric cooler, and are not specifically limited here.

[0050] Located at the head end are evaporators 13 and liquid inlet pipes 12, which supply working fluid to each evaporator 13. Liquid inlet pipes 12 are equipped with working fluid pumps 11, which drive the working fluid into each evaporator 13 in sequence. The structure and operating principle of working fluid pumps 11 can be found in the prior art.

[0051] It should be noted that the flow rate of the working fluid pump 11 can be adjusted according to the actual temperature of the hot end plate 01, and then the flow rate of the working fluid in each evaporator 13 can be adjusted, which is conducive to accurately adjusting the heat exchange efficiency of each evaporator 13, which is beneficial to energy saving and effectively improves the cooling efficiency of the thermoelectric refrigerator.

[0052] To achieve automation, a temperature sensor can be added to detect the actual temperature of the hot end plate 01. The controller is connected to the temperature sensor. The controller pre-stores the corresponding relationship between the actual temperature of the hot end plate 01 and the flow rate of the working fluid pump 11. In this way, the controller can automatically adjust the flow rate of the working fluid pump 11 according to the signal feedback from the temperature sensor, so that the flow rate of the working pump matches the actual temperature of the hot end plate 01, ensuring that the cooling efficiency is maximized.

[0053] The return liquid pipe 19 is connected to the liquid inlet pipe 12. The connection method of the two can refer to the following content. In this way, the working medium can circulate and flow, thereby taking away more heat.

[0054] One end of the condenser 18 is connected to the exhaust pipes 130 of all the evaporators 13 , and the other end is connected to the liquid return pipe 19 , so that the gaseous working medium flowing into the condenser 18 is condensed into liquid working medium and then flows into the liquid return pipe 19 .

[0055] When the working medium pump 11 is started, the liquid working medium flows into each evaporator 13 in sequence through the liquid inlet pipe 12 under the drive of the working medium pump 11. When the temperature of the hot end plate 01 is too high, the liquid working medium absorbs the heat released by the hot end plate 01 in each evaporator 13 and turns into a gas-liquid two-phase working medium. The gaseous working medium continues to absorb heat from the hot end plate 01. The gaseous working medium separated from the gas-liquid two-phase working medium is collected in the condenser 18 through the exhaust pipe 130. The gaseous working medium is mixed with the cold air in the condenser 18. After the gas heat exchange, heat is released, and the gaseous working medium is condensed into liquid working medium and then flows back to the return pipe 19. The return pipe 19 is connected to the liquid inlet pipe 12. The liquid working medium circulates between the evaporator and the condenser 18, and during the circulation process, the heat released by the hot end plate 01 of the thermoelectric refrigerator is taken away by the gas-liquid phase change. Compared with the existing single-phase heat exchange method, the gas-liquid phase change heat transfer efficiency of the liquid working medium of the present invention is higher, which can effectively reduce the temperature of the hot end plate 01, thereby improving the cooling efficiency of the thermoelectric refrigerator.

[0056] The thermoelectric cooling device further includes a support plate 23 that is detachably connected to the hot end plate 01. The support plate 23 is positioned close to the hot end plate 01 and is fixed to the hot end plate 01 by bolts, thereby supporting all evaporators 13. The outer shell of each evaporator 13 can also be detachably fixed to the support plate 23 by bolts. Thermal paste is applied to both opposing sides of the support plate 23, that is, thermal paste is applied between the support plate 23 and the hot end plate 01, and between the support plate 23 and each evaporator 13. This eliminates gaps between the two contacting elements and ensures heat conduction between the two contacting elements. The thermal paste can specifically be thermal conductive silicone grease.

[0057] The thermoelectric refrigeration device also includes a liquid storage tank 20 for storing liquid working fluid. A return pipe 19 is connected to the liquid storage tank 20. Liquid working fluid condensed by the condenser 18 flows back along the return pipe 19 to the liquid storage tank 20, thus recycling the working fluid. The working fluid pump 11 is connected to the liquid storage tank 20 via a liquid supply pipe 21. This ensures that the working fluid pump 11 draws liquid working fluid, preventing cavitation caused by gaseous working fluid entering the return pipe 19. This ensures continuous and stable operation of the working fluid pump 11, thereby extending its service life.

[0058] The thermoelectric refrigeration device also includes an air pipe 15 connected to a condenser 18 at one end. The exhaust pipes 130 of all evaporators 13 are connected to the air pipe 15, allowing the gaseous working fluid evaporated from all evaporators 13 to converge in the air pipe 15 and be transported to the condenser 18. A mixer 16 is located at one end of the air pipe 15, near a gas collecting chamber 181 of the condenser 18. This mixer 16 evenly mixes the liquid and gaseous working fluids flowing out of the exhaust pipe 130 before transporting them to the condenser 18, thereby improving the condensation efficiency of the condenser 18. The structure and operating principle of the mixer 16 can be referenced in the prior art.

[0059] To avoid excessive pressure in each evaporator 13, the evaporator 13 at the end is connected to the mixer 16 through a mixing pipe 17, so that the gaseous working medium and the liquid working medium discharged from the end evaporator 13 are evenly mixed in the mixer 16 and then flow into the condenser 18 along the gas pipe 15.

[0060] Condenser 18 includes several heat dissipation channels 184 and a plenum chamber 181. All heat dissipation channels 184 are arranged in parallel. Plenum chamber 181 is located at one end of all heat dissipation channels 184. Plenum chamber 181 is used to store gaseous working fluid and is connected to all heat dissipation channels 184. After the gaseous working fluid flows into plenum chamber 181 and flows into heat dissipation channels 184, it exchanges heat with the external cold air within the heat dissipation channels 184. After releasing heat, the gaseous working fluid condenses into liquid working fluid. The length and number of heat dissipation channels 184 can be adjusted according to the specifications of the thermoelectric cooler and are not specifically limited here.

[0061] Several equalizing plates 182 are fixed in the gas collecting chamber 181 to Figure 10 Based on the current view, all equalizer plates 182 are arranged in parallel and evenly distributed from bottom to top within the plenum chamber 181, guiding the gaseous working medium from bottom to top into the heat dissipation channel 184. Each equalizer plate 182 can be welded to the two side walls of the plenum chamber 181. The number and spacing of the equalizer plates 182 can be determined based on the specifications of the thermoelectric cooler and are not limited here.

[0062] Each equalizing plate 182 is provided with an air vent 183 for the circulation of the gaseous working medium. The air vent 183 can be a circular hole, but is not limited thereto. The air vents 183 of all equalizing plates 182 are coaxially connected to ensure that the gaseous working medium can fill the gas collecting chamber 181. The apertures of all the air vents 183 gradually decrease from bottom to top, so that the gaseous working medium enters the heat dissipation channel 184 evenly from bottom to top. In addition, when the saturated gas-liquid two-phase working medium enters the gas collecting chamber 181 under special working conditions, the setting of the equalizing plate 182 is more conducive to the saturated gas-liquid two-phase working medium flowing into the heat dissipation channel 184, avoiding the liquid working medium from gathering in part of the heat dissipation channel 184 and affecting the heat dissipation efficiency.

[0063] Condenser 18 also includes a liquid collection chamber 186. Gas collection chamber 181 and liquid collection chamber 186 are located at both ends of each heat dissipation channel 184, respectively, for storing the liquid working medium condensed through heat dissipation channel 184. Liquid collection chamber 186 is connected to liquid return pipe 19, allowing the condensed liquid working medium in liquid collection chamber 186 to flow back into liquid storage tank 20 along liquid return pipe 19.

[0064] The two ends of all the heat dissipation channels 184 extend into the gas collecting chamber 181 and the liquid collecting chamber 186 respectively, so that the two ends of each heat dissipation channel 184 are reliably connected to the gas collecting chamber 181 and the liquid collecting chamber 186 respectively, avoiding mixed flow due to leakage between the heat dissipation channels 184, and also avoiding the accumulation of a large amount of condensed liquid working medium in some heat dissipation channels 184 and affecting the condensation effect of the condenser 18.

[0065] Heat dissipation fins 185 are installed parallel to each other between any two adjacent heat dissipation channels 184, enhancing the heat exchange efficiency of each channel 184 and improving the condensation performance of the condenser. All heat dissipation fins 185 are perpendicular to the outer walls of the adjacent heat dissipation channels 184, ensuring maximum contact area between the fins 185 and the cold air, which also helps improve heat exchange efficiency. The spacing between adjacent heat dissipation channels 184 and the number of heat dissipation fins 185 can also be adjusted according to the specifications of the thermoelectric cooler and are not specifically limited here.

[0066] The thermoelectric refrigeration device further includes a heat dissipation fan 22 disposed on at least one side of the condenser 18 to accelerate the heat exchange efficiency between the gaseous working medium in the heat dissipation channel 184 and the external cold air, thereby improving the condensation effect of the condenser 18. The structure and operating principle of the heat dissipation fan 22 can be referenced in the prior art. The heat dissipation fan 22 can be directly fixed to the side of the condenser 18. Specifically, two heat dissipation fans 22 can be provided on each side of the condenser 18. The number of heat dissipation fans 22 provided can be adjusted as needed and is not limited here.

[0067] The working principle of the thermoelectric refrigeration device provided by the present invention is as follows:

[0068] Under normal conditions, the cold end plate 02 of the thermoelectric cooler cools the device;

[0069] When the temperature of the hot end plate 01 is high, the working medium pump 11 is started, and the liquid working medium flows into each evaporator 13 in sequence through the liquid inlet pipe 12 under the drive of the working medium pump 11. The liquid working medium absorbs the heat released by the hot end plate 01 in each evaporator 13 and turns into a gas-liquid two-phase working medium. The gas-liquid two-phase working medium continues to absorb heat from the hot end plate 01, and the dryness of the working medium increases. The gaseous working medium separated from the gas-liquid two-phase working medium is discharged from the exhaust pipe 1 30 converges to the air delivery pipe 15, flows into the air collecting chamber 181 of the condenser 18 through the air delivery pipe 15, and after being divided by the flow equalizing plate 182, the gaseous working medium flows evenly into each heat dissipation channel 184, exchanges heat with the external cold air in the heat dissipation channel 184, and the gaseous working medium condenses into liquid working medium and flows into the liquid collecting chamber 186, and then flows back from the liquid collecting chamber 186 along the return liquid pipe 19 to the liquid storage tank 20. This cycle can take away the heat of the hot end plate 01 of the thermoelectric cooler.

[0070] The thermoelectric cooling device provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core concept of the present invention. At the same time, for those skilled in the art, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A thermoelectric cooling device, comprising a thermoelectric cooler, characterized in that: Also includes: A plurality of evaporators (13) arranged in series and fixed to the hot end plate (01) of the thermoelectric cooler; A liquid inlet pipe (12) is provided with a working fluid pump (11) and is connected to the evaporator (13) located at the head end; a liquid return pipe (19) connected to the liquid inlet pipe (12); a condenser (18) having one end connected to the exhaust pipes (130) of all the evaporators (13) and the other end connected to the liquid return pipe (19); an air delivery pipe (15) connected at one end to the condenser (18) and connected to exhaust pipes (130) of all the evaporators (13), wherein the air delivery pipe (15) is provided with a mixer (16) for mixing gas-liquid two-phase working medium; Driven by the working medium pump (11), the liquid working medium flows into each of the evaporators (13) in sequence through the liquid inlet pipe (12), absorbs the heat released by the hot end plate (01) in the evaporator (13), and turns into a gas-liquid two-phase working medium. The gaseous working medium separated from the gas-liquid two-phase working medium is collected in the condenser (18) through the exhaust pipe (130), condensed into a liquid working medium, and then flows back to the liquid return pipe (19); The evaporator (13) at the end is connected to the mixer (16) via a liquid mixing pipe (17).

2. The thermoelectric refrigeration device according to claim 1, characterized in that: Each of the evaporators (13) is provided with a closed evaporation chamber (134), and a plurality of evenly distributed heat exchange fins (135) are fixed in the evaporation chamber (134).

3. The thermoelectric refrigeration device according to claim 1, characterized in that: It also includes a support plate (23) detachably connected to the hot end plate (01) and used to support all of the evaporators (13), and two opposite sides of the support plate (23) are coated with heat dissipation grease.

4. The thermoelectric refrigeration device according to any one of claims 1 to 3, characterized in that: It also includes a liquid storage tank (20) connected to the liquid return pipe (19), and the working fluid pump (11) is connected to the liquid storage tank (20) via a liquid supply pipe (21).

5. The thermoelectric refrigeration device according to any one of claims 1 to 3, characterized in that: The condenser (18) comprises a plurality of heat dissipation channels (184) arranged in parallel and a gas collecting chamber (181) connected to all the heat dissipation channels (184). The gas collecting chamber (181) is fixed with a plurality of flow equalizing plates (182) for guiding the gaseous working medium to enter the heat dissipation channels (184) from bottom to top. The vent holes (183) provided on all the flow equalizing plates (182) are coaxially connected, and the apertures of all the vent holes (183) gradually decrease from bottom to top.

6. The thermoelectric refrigeration device according to claim 5, characterized in that: The condenser (18) further comprises a liquid collecting chamber (186) connected to one end of all the heat dissipation channels (184) away from the gas collecting chamber (181), and both ends of all the heat dissipation channels (184) extend and are inserted into the gas collecting chamber (181) and the liquid collecting chamber (186), respectively.

7. The thermoelectric refrigeration device according to claim 5, characterized in that: A heat dissipation fin (185) is fixedly provided in parallel between any two adjacent heat dissipation channels (184).

8. The thermoelectric refrigeration device according to any one of claims 1 to 3, characterized in that: It also includes a heat dissipation fan (22) provided on at least one side of the condenser (18).

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