Compressed air cooling system with defrosting function

Abstract

The invention relates to a compressed air cooling system with a defrosting function, which is characterized in that a refrigerant subjected to high-temperature and high-pressure treatment is conveyed to a defrosting channel through a compression module, and the refrigerant enters the defrosting channel from a first cooling channel port of a second plate heat exchanger in a current defrosting mode for defrosting; then the refrigerant is conveyed to the backflow channel from a second cooling channel port of the second plate heat exchanger in the current defrosting mode, the backflow channel conveys the refrigerant to the refrigeration module, and the refrigeration module freeze-dries the refrigerant and conveys the refrigerant to a second cooling channel port of the first plate heat exchanger; the refrigerant is used for cooling air input into the cooled channel, and then the cooled air is output to a set position from the cooled channel. And synchronously, the refrigerant is output from the port of the first cooling channel of the first plate heat exchanger and is conveyed to the compression module through the recovery channel. The refrigeration efficiency of the refrigeration module can be improved, and energy consumption is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment, and in particular to a compressed air cooling system with a defrosting function. Background Art

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid. It is widely used in various fields, including chemical engineering, energy, power generation, and medicine. A heat exchanger, also known as a heat exchanger, operates primarily based on the principle of heat conduction. A solid partition separates the hot and cold fluids, allowing heat to transfer from the hot fluid to the cold fluid through the partition, thus achieving heat exchange. This device typically consists of a large, sealed container filled with water or another medium. Pipes run through the container, allowing hot water to flow through them. The temperature difference between the hot water in the pipes and the cold water in the container creates heat exchange, with heat from the hotter object always transferring to the cooler object. There are many types of heat exchangers, including shell and tube, coiled tube, double-tube, threaded plate, volumetric, heat pipe, and plate. A plate heat exchanger is a type of heat exchanger made of a series of stacked, corrugated metal sheets. Thin rectangular channels are formed between the plates, through which heat is exchanged. The basic components of a plate heat exchanger include the plates, sealing gaskets, fixed and movable pressure plates, clamping bolts, upper and lower guide rods, and rear columns. Due to their high heat exchange efficiency, minimal heat loss, and compact and lightweight structure, plate heat exchangers are widely used in the chemical, textile, nonferrous metal, machinery, central heating, shipbuilding, air conditioning and refrigeration, food, steel, electric power, oil and fat, papermaking, and pharmaceutical industries.

[0003] Existing plate heat exchangers will accumulate frost during the heat exchange process, affecting the cooling effect. It is often necessary to stop the heat exchange operation of the plate heat exchanger and then apply electricity to heat the inside to defrost, resulting in low cooling efficiency and high energy consumption of the cooling system.

[0004] Therefore, it is necessary to provide a compressed air cooling system with a defrosting function to solve the above problems. Summary of the Invention

[0005] The present invention relates to a compressed air cooling system with a defrost function, wherein the compressed air cooling system with a defrost function delivers a refrigerant that has been treated with high temperature and high pressure to a defrost channel through a compression module. The defrost channel allows the refrigerant to enter the interior through the first cooling channel port of a second plate heat exchanger in defrost mode, and utilizes the high temperature of the refrigerant itself to melt the frost inside. During the melting process, the frost absorbs the heat of the refrigerant to achieve preliminary cooling of the refrigerant. The preliminarily cooled refrigerant is delivered from the second cooling channel port of the second plate heat exchanger in the current defrost mode to a return channel. The return channel delivers the refrigerant to a refrigeration module, which freeze-dries the refrigerant. Since the refrigerant is preliminarily cooled during the defrost process, the refrigeration efficiency of the refrigeration module can be improved, energy consumption can be saved, and the problem of low refrigeration efficiency and high energy consumption in the prior art due to the need for separate heating and defrosting after refrigeration of the plate heat exchanger is solved.

[0006] To solve the above problems, the present invention provides a compressed air cooling system with a defrost function, comprising a cooling channel, a cooled channel, a compression module, a refrigeration module, a first plate heat exchanger, a second plate heat exchanger, a return channel, a defrost channel and a recovery channel; the first plate heat exchanger and the second plate heat exchanger each have a first cooling channel port, a second cooling channel port, a first cooled channel port and a second cooled channel port; one end of the defrost channel is connected to the first cooling channel port of the first plate heat exchanger through a first switch unit, one end of the recovery channel is connected to the first cooling channel port of the first plate heat exchanger through a second switch unit; one end of the cooling channel is connected to the second cooling channel port of the first plate heat exchanger through a third switch unit, and one end of the return channel is connected to the second cooling channel port of the first plate heat exchanger through a fourth switch unit; the first cooled channel port of the first plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the first plate heat exchanger is connected to the output channel of the cooled channel;

[0007] One end of the defrost channel is connected to the first cooling channel port of the second plate heat exchanger through a fifth switch unit, and one end of the recovery channel is connected to the first cooling channel port of the second plate heat exchanger through a sixth switch unit; one end of the cooling channel is connected to the second cooling channel port of the second plate heat exchanger through a seventh switch unit, and one end of the return channel is connected to the second cooling channel port of the second plate heat exchanger through an eighth switch unit; the first cooled channel port of the second plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the second plate heat exchanger is connected to the output channel of the cooled channel;

[0008] The other end of the defrost channel is connected to the output end of the compression module through the regulating switch, the other end of the reflux channel is connected to the other end of the cooling channel through the refrigeration module, the other end of the cooling channel is connected to the output end of the compression module through the refrigeration module and the regulating switch, and the other end of the recovery channel is connected to the input end of the compression module.

[0009] Due to the adoption of the above-mentioned compressed air cooling system with a defrost function, the present invention has the following beneficial effects compared to the prior art: The present invention relates to a compressed air cooling system with a defrost function, the compressed air cooling system with a defrost function comprising a cooling channel, a cooled channel, a compression module, a refrigeration module, a first plate heat exchanger, a second plate heat exchanger, a return channel, a defrost channel, and a recovery channel. The first plate heat exchanger and the second plate heat exchanger each have a first cooling channel port, a second cooling channel port, a first cooled channel port, and a second cooled channel port. One end of the defrost channel is connected to the first cooling channel port of the first plate heat exchanger via a first switch unit, and one end of the recovery channel is connected to the first cooling channel port of the first plate heat exchanger via a second switch unit. One end of the cooling channel is connected to the second cooling channel port of the first plate heat exchanger via a third switch unit, and one end of the return channel is connected to the second cooling channel port of the first plate heat exchanger via a fourth switch unit. The first cooled channel port of the first plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the first plate heat exchanger is connected to the output channel of the cooled channel. One end of the defrost channel is connected to the first cooling channel port of the second plate heat exchanger via the fifth switch unit, and one end of the recovery channel is connected to the first cooling channel port of the second plate heat exchanger via the sixth switch unit. One end of the cooling channel is connected to the second cooling channel port of the second plate heat exchanger via the seventh switch unit, and one end of the return channel is connected to the second cooling channel port of the second plate heat exchanger via the eighth switch unit. The first cooled channel port of the second plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the second plate heat exchanger is connected to the output channel of the cooled channel. The other end of the defrost channel is connected to the output of the compression module via the regulating switch, the other end of the return channel is connected to the other end of the cooling channel via the refrigeration module, the other end of the cooling channel is connected to the output of the compression module via the refrigeration module and the regulating switch, and the other end of the recovery channel is connected to the input of the compression module. The compression module delivers high-temperature, high-pressure refrigerant to the defrost channel. The defrost channel then draws the refrigerant from the first cooling channel port of the second plate heat exchanger, which is in defrost mode. The refrigerant's high temperature melts the frost inside, absorbing heat from the refrigerant during the melting process to achieve initial cooling. The preliminarily cooled refrigerant is then delivered from the second cooling channel port of the second plate heat exchanger, which is currently in defrost mode, to the return channel. The return channel then delivers the refrigerant to the refrigeration module, which freeze-dries it. Because the refrigerant undergoes a preliminary cooling process during the defrost process, the module's refrigeration efficiency is improved, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] 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. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0011] Figure 1 The figure is a schematic diagram of the circuit layout of an embodiment of a compressed air cooling system with a defrosting function of the present invention.

[0012] Figure 2 The figure is a structural schematic diagram of an embodiment of a compressed air cooling system with a defrosting function according to the present invention.

[0013] Figure 3 The internal structure of an embodiment of the compressed air cooling system with defrosting function of the present invention is shown in FIG. Figure 1 .

[0014] Figure 4 The internal structure of an embodiment of the compressed air cooling system with defrosting function of the present invention is shown in FIG. Figure 2 .

[0015] Figure 5 Schematic diagram of the internal structure of an embodiment of the compressed air cooling system with defrosting function of the present invention Figure 3 .

[0016] In the figure: 1. Compressed air cooling system with defrost function; 21. Input channel; 211. First flow meter; 212. Ball valve; 22. Output channel; 221. Second normally closed solenoid valve; 222. Second flow meter; 3. Compression module; 31. Gas separator; 32. Compressor; 33. Oil separator; 4. Cooling channel; 41. Condenser unit; 42. First filter drier; 43. Liquid collecting tank; 44. Second filter drier; 45. Third switch unit; 46. Seventh switch unit; 5. First plate heat exchanger; 51. First cooling channel port; 52. Second cooling channel port; 53. First cooled channel port; 54. Second cooled channel port; 6 , second plate heat exchanger; 61, first cooling channel port; 62, second cooling channel port; 63, first cooled channel port; 64, second cooled channel port; 7, recovery channel; 71, second switch unit; 72, sixth switch unit; 8, defrost channel; 81, first switch unit; 811, first connecting pipe; 812, first one-way valve; 813, first normally closed solenoid valve; 82, fifth switch unit; 9, reflux channel; 91, fourth switch unit; 911, second one-way valve; 912, second solenoid valve; 92, eighth switch unit; 10, regulating switch; 11, chassis; 12, water collecting box; 13, drainage pipe; 131, fourth solenoid valve. DETAILED DESCRIPTION

[0017] 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 those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left",

[0019] The words “right,” “inside,” “outside,” “side,” “top,” and “bottom” are merely references to the directions in the drawings. The directional terms used are intended to illustrate and understand the present invention, not to limit the present invention.

[0020] In the figures, structurally similar elements are denoted by the same reference numerals.

[0021] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 In this embodiment, the compressed air cooling system 1 with a defrost function includes a cooling channel 4, a cooled channel, a compression module 3, a refrigeration module, a first plate heat exchanger 5, a second plate heat exchanger 6, a return channel 9, a defrost channel 8, and a recovery channel 7. Both the first plate heat exchanger 5 and the second plate heat exchanger 6 have a first cooling channel port, a second cooling channel port, a first cooled channel port, and a second cooled channel port. One end of the defrost channel 8 is connected to the first cooling channel port 51 of the first plate heat exchanger 5 via a first switch unit 81, and one end of the recovery channel 7 is connected to the first cooling channel port 51 of the first plate heat exchanger 5 via a second switch unit 71. One end of the cooling channel 4 is connected to the second cooling channel port 52 of the first plate heat exchanger 5 via a third switch unit 45, and one end of the return channel 9 is connected to the second cooling channel port 52 of the first plate heat exchanger 5 via a fourth switch unit 91. The first cooled channel port 53 of the first plate heat exchanger 5 is connected to the input channel 21 of the cooled channel, and the second cooled channel port 54 of the first plate heat exchanger 5 is connected to the output channel 22 of the cooled channel.

[0022] One end of the defrost channel 8 is connected to the first cooling channel port 61 of the second plate heat exchanger 6 via the fifth switch unit 82. One end of the recovery channel 7 is connected to the first cooling channel port 61 of the second plate heat exchanger 6 via the sixth switch unit 72. One end of the cooling channel 4 is connected to the second cooling channel port 62 of the second plate heat exchanger 6 via the seventh switch unit 46. One end of the return channel 9 is connected to the second cooling channel port 622 of the second plate heat exchanger 6 via the eighth switch unit 92. The first cooled channel port 63 of the second plate heat exchanger 6 is connected to the cooled channel input channel 21, and the second cooled channel port 64 of the second plate heat exchanger 6 is connected to the cooled channel output channel 22.

[0023] The other end of the defrost channel 8 is connected to the output end of the compression module 3 through the regulating switch 10, the other end of the reflux channel 9 is connected to the other end of the cooling channel 4 through the refrigeration module, the other end of the cooling channel 4 is connected to the output end of the compression module 3 through the refrigeration module and the regulating switch 10, and the other end of the recovery channel 7 is connected to the input end of the compression module 3.

[0024] The compression module 3 delivers the refrigerant, which has been treated with high temperature and high pressure, to the defrost channel 8. The defrost channel 8 allows the refrigerant to enter the interior through the first cooling channel port 61 of the second plate heat exchanger 6 in the defrost mode, and uses the high temperature of the refrigerant to melt the frost inside. During the melting process, the frost absorbs the heat of the refrigerant to achieve preliminary cooling of the refrigerant. The preliminarily cooled refrigerant is delivered from the second cooling channel port 62 of the second plate heat exchanger 6 in the current defrost mode to the return channel 9. The return channel 9 delivers the refrigerant to the refrigeration module, which freeze-dries the refrigerant. Since the refrigerant is preliminarily cooled during the defrost process, the freezing efficiency of the refrigeration module can be improved, saving energy.

[0025] During use, the first plate heat exchanger 5 and the second plate heat exchanger 6 have three working states, namely, standby mode, cooling mode and defrost mode. Switching between the three modes can be controlled by controlling the corresponding switches.

[0026] First, when the first plate heat exchanger 5 is in cooling mode and the second plate heat exchanger 6 is in standby mode, the regulating switch 10, the second switch unit 71, and the third switch unit 45 are all in the open state, and the first switch unit 81, the fourth switch unit 91, the fifth switch unit 82, the sixth switch unit 72, the seventh switch unit 46, and the eighth switch unit 92 are all in the closed state.

[0027] Specifically, compression module 3 delivers high-temperature, high-pressure refrigerant to cooling channel 4 via regulating switch 10. The refrigeration module in cooling channel 4 freeze-dries the refrigerant before delivering it to the second cooling channel port of first plate heat exchanger 5. The refrigerant's freezing effect cools air entering input channel 21 of the cooling channel within first plate heat exchanger 5. The cooled air is then delivered to a set position via output channel 22 of the cooling channel. Simultaneously, refrigerant is delivered from the first cooling channel port of first plate heat exchanger 5 to recovery channel 7, which delivers it to the input of compression module 3. This completes one refrigeration cycle of first plate heat exchanger 5.

[0028] Secondly, when the first plate heat exchanger 5 and the second plate heat exchanger 6 are both in the cooling mode, the regulating switch 10, the second switch unit 71, the third switch unit 45, the sixth switch unit 72, and the seventh switch unit 46 are all in the open state, and the first switch unit 81, the fourth switch unit 91, the fifth switch unit 82, and the eighth switch unit 92 are all in the closed state.

[0029] Specifically, compression module 3 delivers high-temperature, high-pressure refrigerant to cooling channel 4 via regulating switch 10. The refrigeration module in cooling channel 4 freeze-dries the refrigerant and then delivers it to second cooling channel port 52 of first plate heat exchanger 5 and second cooling channel port 62 of second plate heat exchanger 6. The refrigerant's freezing effect cools the air entering the corresponding input channel 21 of the cooled channel within first plate heat exchanger 5 and second plate heat exchanger 6. The cooled air is then delivered to a set position via output channel 22 of the cooled channel. Simultaneously, refrigerant is delivered from first cooling channel port 51 of first plate heat exchanger 5 and second cooling channel port 61 of second plate heat exchanger 6 to recovery channel 7, which then delivers the refrigerant to the input of compression module 3. This completes a refrigeration cycle.

[0030] Then, when the first plate heat exchanger 5 is in cooling mode and the second plate heat exchanger 6 is in defrosting mode, the second switch unit 71, the third switch unit 45, the fifth switch unit 82, and the eighth switch unit 92 are all in the open state, and the regulating switch 10, the first switch unit 81, the fourth switch unit 91, the sixth switch unit 72, and the seventh switch unit 46 are all in the closed state.

[0031] Specifically, when the regulating switch 10 is closed, the compression module 3 delivers the refrigerant that has been treated with high temperature and high pressure to the defrost channel 8. The defrost channel 8 delivers the refrigerant from the first cooling channel port 61 of the second plate heat exchanger 6 to its interior through the fifth switch unit 82. The high temperature of the refrigerant itself is used to melt the frost inside. During the melting process, the frost absorbs the heat of the refrigerant to achieve preliminary cooling of the refrigerant. The preliminarily cooled refrigerant is delivered from the second cooling channel port 62 of the second plate heat exchanger 6 to the return channel 9. The return channel 9 delivers the preliminarily cooled refrigerant to the refrigeration module position of the cooling channel 4, and the refrigeration module freeze-dries the refrigerant. Since the refrigerant is preliminarily cooled during the defrost process, the refrigeration efficiency of the refrigeration module can be improved, saving energy. The refrigeration module allows the frozen refrigerant to enter its interior from the second cooling channel port of the first plate heat exchanger 5, uses the freezing effect of the refrigerant to cool the air input into the cooled channel, and then outputs the cooled air from the output channel 22 of the cooled channel to the set position. Simultaneously, the refrigerant is output from the first cooling channel port 51 of the first plate heat exchanger 5 and delivered to the compression module 3 through the recovery channel 7. Thus, a working cycle is formed.

[0032] Similarly, if the first plate heat exchanger 5 is in the defrost mode and the second plate heat exchanger 6 is in the cooling mode, the first switch unit 81, the fourth switch unit 91, the sixth switch unit 72, and the seventh switch unit 46 are all in the open state, and the regulating switch 10, the second switch unit 71, the third switch unit 45, the fifth switch unit 82, and the eighth switch unit 92 are all in the closed state, which can also form a defrost to cooling working cycle loop.

[0033] In this embodiment, please refer to Figure 1 、 Figure 4 、 Figure 5The first switch unit 81 and the fifth switch unit 82 have the same structure. The first switch unit 81 includes a first connecting pipe 811, a first one-way valve 812, and a first normally closed solenoid valve 813. One end of the first connecting pipe 811 is connected to the other end of the defrost channel 8, and the other end of the first connecting pipe 811 is connected to the first cooling channel port of the first plate heat exchanger 5. The first one-way valve 812 and the first normally closed solenoid valve 813 are sequentially arranged on the first connecting pipe 811. The first one-way valve 812 is used to prevent reverse conduction. This realizes automatic control of the opening and closing of the defrost channel 8. When the first plate heat exchanger 5 needs to be defrosted, the first normally closed solenoid valve 813 corresponding to the first plate heat exchanger 5 is opened, and the refrigerant flows from the defrost channel 8 through the first normally closed solenoid valve 813, the first one-way valve 812, and the first cooling channel port 61 of the second plate heat exchanger 6 into the first plate heat exchanger 5. Defrosting is performed by relying on the temperature of the refrigerant, which can not only reduce the temperature of the refrigerant, but also play a role in defrosting, significantly saving energy, without affecting the continuous and uninterrupted refrigeration operation of the second plate heat exchanger 6 in the current refrigeration mode, and is more convenient to use.

[0034] In this embodiment, please refer to Figure 1 、 Figure 4 、 Figure 5 The fourth switch unit 91 and the eighth switch unit 92 have the same structure. The fourth switch unit 91 includes a second one-way valve 911 and a second solenoid valve 912. The second solenoid valve 912 and the second one-way valve 911 are connected in series to the second cooling channel port 52 of the first plate heat exchanger 5. The second one-way valve 911 is used to prevent reverse conduction, improving control accuracy and enhancing control efficiency.

[0035] In this embodiment, the third switch unit 45 and the seventh switch unit 46 have the same structure and are both configured as solenoid valve structures, which are simple in structure, more convenient to control, and low in cost. The second switch unit 71 and the sixth switch unit 72 have the same structure and are both configured as solenoid valve structures.

[0036] In this embodiment, please refer to Figure 1 、 Figure 2 To improve the ability to determine the degree of defrost in first plate heat exchanger 5 during cooling mode and automatically initiate the defrost process, a first flowmeter 211 is installed at the input of cooling channel 4, and a second flowmeter 222 is installed at the output of the cooled channel. When the difference between the readings of first flowmeter 211 and second flowmeter 222 exceeds a set threshold, first plate heat exchanger 5 switches to defrost mode and second plate heat exchanger 6 switches to cooling mode. This improves the control accuracy and efficiency of the transition between defrost and cooling modes.

[0037] Among them, a ball valve 212 can be set at the air inlet end of the input channel 21 of the cooled channel to facilitate the control of the opening and closing of the input channel 21, and has higher compatibility and adjustability.

[0038] Each branch of the output channel 22 of the cooled channel is connected to one end of the drain pipe 13. Each connecting section of the drain pipe 13 and the output channel 22 is equipped with a fourth solenoid valve 131 to control the discharge of the liquefied cooling water. The other end of the drain pipe 13 is connected to the water collection box 12 to collect waste water.

[0039] In this embodiment, the second plate heat exchanger 6, in standby mode, is pre-cooled to a set temperature. The second plate heat exchanger 6 is set to the current cooling mode and is electrically connected to the cooled channel and the cooling channel 4. When the difference between the first flowmeter 211 and the second flowmeter 222 exceeds a set threshold, the second plate heat exchanger 6 switches to cooling mode, and the regulating switch 10 opens. When the second plate heat exchanger 6 cools to the set temperature, the first plate heat exchanger 5 switches to defrost mode, and the regulating switch 10 closes. Pre-cooling the second plate heat exchanger 6 at room temperature before switching to the current cooling mode ensures that the cooling effect of the incoming air remains unchanged, thereby achieving continuous and uninterrupted cooling and achieving a better cooling effect.

[0040] In this embodiment, please refer to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 The compression module 3 includes a gas separator 31, a compressor 32 and an oil separator 33 connected in sequence. The gas separator 31 is connected to the recovery channel 7, and the oil separator 33 is connected to the regulating switch 10 and the defrost channel 8. The gas separator 31 can prevent a large amount of liquid refrigerant from impacting the compressor 32, play a buffering role, and separate the liquid. After passing through the gas-liquid separator, the refrigerant still maintains a high-temperature and high-pressure liquid state. The oil separator 33 can separate the oil brought out by the refrigerant and return it to the compressor 32 to prevent the oil from entering the subsequent plate heat exchanger and affecting the heat transfer efficiency. After passing through the oil separator 33, the refrigerant is still in a high-temperature and high-pressure liquid state, which can improve the refrigeration effect and extend the service life.

[0041] In this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The compressed air cooling system 1 with defrost function also includes a chassis 11. From top to bottom, chassis 11 is provided with a first cavity and a second cavity. The first plate heat exchanger 5, the second plate heat exchanger 6, the defrost channel 8, the cooling channel 4, and the cooled channel are located within the first cavity. The recovery channel 7, the compression module 3, the return channel 9, and the refrigeration module are located within the second cavity. This compact structure and rational layout result in an even more compact structure.

[0042] The following describes the operating principle of a compressed air cooling system with defrost function 1 using two plate heat exchangers as an example. The operating principle of a compressed air cooling system with defrost function 1 with more than two plate heat exchangers is the same as that of a system with two plate heat exchangers, and can be referenced in the corresponding content.

[0043] First, in the initial state, the regulating switch 10 is turned on, wherein the first plate heat exchanger 5 is adjusted to the current cooling mode, the second switch unit 71 corresponding to the first plate heat exchanger 5 is turned on, the third switch unit 45 is turned on, the first switch unit 81 is turned off, and the fourth switch unit 91 is turned off; the second plate heat exchanger 6 is in standby mode, and the fifth switch unit 82, the sixth switch unit 72, the seventh switch unit 46, and the eighth switch unit 92 corresponding to the second plate heat exchanger 6 are all turned off.

[0044] Second, compressor 32 processes the refrigerant at high temperature and high pressure and delivers it to oil separator 33, where the oil is separated from the high-temperature, high-pressure refrigerant. Oil separator 33 then delivers the separated refrigerant through cooling channel 4, sequentially to condenser unit 41, first filter drier 42, accumulator tank 43, and second filter drier 44 for freeze-drying. The treated refrigerant is then delivered from second cooling channel port 52 of first plate heat exchanger 5 into the interior of first plate heat exchanger 5. Simultaneously, the input channel 21 of the cooled channel delivers external air into the first plate heat exchanger 5. The air undergoes heat exchange and is cooled by the refrigerant. The cooled air is then delivered from output channel 22 of the cooled channel to a predetermined location. The refrigerant is then output from first cooling channel port 51 of first plate heat exchanger 5 into recovery channel 7, where it flows back into gas separator 31.

[0045] Third, the first flowmeter 211 monitors the inflow of air in real time, and the second flowmeter 222 monitors the outflow of air in real time, and these two measurements are compared in real time. When the difference between the readings of the first flowmeter 211 and the second flowmeter 222 exceeds a set threshold, it indicates that the defrost blockage in the first plate heat exchanger 5 is affecting the output of cooling air, thereby reducing the cooling effect. The first plate heat exchanger 5 needs to be defrosted.

[0046] Fourth, the fifth switch unit 82 corresponding to the second plate heat exchanger 6 in standby mode is turned on, the eighth switch unit 92 is turned on, the sixth switch unit 72 is turned off, and the seventh switch unit 46 is turned off. The refrigerant in the cooling channel 4 is divided into two branches and transported to the first plate heat exchanger 5 and the second plate heat exchanger 6 respectively.

[0047] Fifth, after the second plate heat exchanger 6 in standby mode has been cooled to the set temperature, the second plate heat exchanger 6 is switched to cooling mode, and the first plate heat exchanger 5 is switched to defrosting mode. Simultaneously, the regulating switch 10 is closed; the fifth and eighth switch units 82 and 92 corresponding to the second plate heat exchanger 6 are closed, the sixth and seventh switch units 72 and 46 are opened; and the second and third switch units 71 and 45 corresponding to the first plate heat exchanger 5 are closed, the first and fourth switch units 81 and 91 are opened.

[0048] Sixth, compressor 32 processes the refrigerant at high temperature and pressure and delivers it to oil separator 33, where the oil in the high-temperature, high-pressure refrigerant is separated. Oil separator 33 delivers the separated refrigerant from defrost channel 8 to first cooling channel port 51 of first plate heat exchanger 5, where it enters the interior. The high-temperature, high-pressure refrigerant is cooled in first plate heat exchanger 5. Its high temperature melts the frost inside first plate heat exchanger 5. The melted frost absorbs the refrigerant's heat, cooling the refrigerant. The refrigerant is then delivered from second cooling channel port 52 of first plate heat exchanger 5 to return channel 9. Return channel 9 delivers the preliminarily cooled refrigerant to cooling channel 4. Through cooling channel 4, the refrigerant is sequentially delivered to condenser unit 41, first filter drier 42, header tank 43, and second filter drier 44 for freeze-drying. The treated refrigerant is then delivered from second cooling channel port 62 of second plate heat exchanger 6 to the interior of second plate heat exchanger 6. Simultaneously, the input channel 21 of the cooled channel delivers external air to the second plate heat exchanger 6. The air is cooled by the refrigerant through heat exchange. The cooled air is then delivered to a predetermined location through the output channel 22 of the cooled channel. The refrigerant is then output from the upper outlet of the second plate heat exchanger 6 to the recovery channel 7, where it flows back to the gas separator 31.

[0049] Seventh, first flowmeter 211 monitors the inflowing air volume in real time, and second flowmeter 222 monitors the outflowing air volume in real time, and a comparison is performed in real time. When the difference between the readings of first flowmeter 211 and second flowmeter 222 exceeds a set threshold, it indicates that the defrost blockage in second plate heat exchanger 6 is affecting the output of cooling air, thereby reducing the cooling effect. Defrost treatment is required for second plate heat exchanger 6. Repeat steps 4 through 6, with first plate heat exchanger 5 and second plate heat exchanger 6 alternately performing heat exchange operations.

[0050] In this embodiment, the present invention relates to a compressed air cooling system with a defrost function, comprising a cooling channel, a cooled channel, a compression module, a refrigeration module, a first plate heat exchanger, a second plate heat exchanger, a return channel, a defrost channel, and a recovery channel. The first plate heat exchanger and the second plate heat exchanger each have a first cooling channel port, a second cooling channel port, a first cooled channel port, and a second cooled channel port. One end of the defrost channel is connected to the first cooling channel port of the first plate heat exchanger via a first switch unit, and one end of the recovery channel is connected to the first cooling channel port of the first plate heat exchanger via a second switch unit. One end of the cooling channel is connected to the second cooling channel port of the first plate heat exchanger via a third switch unit, and one end of the return channel is connected to the second cooling channel port of the first plate heat exchanger via a fourth switch unit. The first cooled channel port of the first plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the first plate heat exchanger is connected to the output channel of the cooled channel. One end of the defrost channel is connected to the first cooling channel port of the second plate heat exchanger via the fifth switch unit, and one end of the recovery channel is connected to the first cooling channel port of the second plate heat exchanger via the sixth switch unit. One end of the cooling channel is connected to the second cooling channel port of the second plate heat exchanger via the seventh switch unit, and one end of the return channel is connected to the second cooling channel port of the second plate heat exchanger via the eighth switch unit. The first cooled channel port of the second plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the second plate heat exchanger is connected to the output channel of the cooled channel. The other end of the defrost channel is connected to the output of the compression module via the regulating switch, the other end of the return channel is connected to the other end of the cooling channel via the refrigeration module, the other end of the cooling channel is connected to the output of the compression module via the refrigeration module and the regulating switch, and the other end of the recovery channel 7 is connected to the input of the compression module. The compression module delivers high-temperature, high-pressure refrigerant to the defrost channel. The defrost channel then draws the refrigerant from the first cooling channel port of the second plate heat exchanger, which is in defrost mode. The refrigerant's high temperature melts the frost inside, absorbing heat from the refrigerant during the melting process to achieve initial cooling. The preliminarily cooled refrigerant is then delivered from the second cooling channel port of the second plate heat exchanger, which is currently in defrost mode, to the return channel. The return channel then delivers the refrigerant to the refrigeration module, which freeze-dries it. Because the refrigerant undergoes a preliminary cooling process during the defrost process, the module's refrigeration efficiency is improved, saving energy.

[0051] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A compressed air cooling system with defrosting function, characterized in that: The heat exchanger comprises a cooling channel, a cooled channel, a compression module, a refrigeration module, a first plate heat exchanger, a second plate heat exchanger, a reflux channel, a defrost channel and a recovery channel; the first plate heat exchanger and the second plate heat exchanger each have a first cooling channel port, a second cooling channel port, a first cooled channel port and a second cooled channel port; one end of the defrost channel is connected to the first cooling channel port of the first plate heat exchanger through a first switch unit, and one end of the recovery channel is connected to the first cooling channel port of the first plate heat exchanger through a second switch unit; one end of the cooling channel is connected to the second cooling channel port of the first plate heat exchanger through a third switch unit, and one end of the reflux channel is connected to the second cooling channel port of the first plate heat exchanger through a fourth switch unit; the first cooled channel port of the first plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the first plate heat exchanger is connected to the output channel of the cooled channel; One end of the defrost channel is connected to the first cooling channel port of the second plate heat exchanger through a fifth switch unit, and one end of the recovery channel is connected to the first cooling channel port of the second plate heat exchanger through a sixth switch unit; one end of the cooling channel is connected to the second cooling channel port of the second plate heat exchanger through a seventh switch unit, and one end of the return channel is connected to the second cooling channel port of the second plate heat exchanger through an eighth switch unit; the first cooled channel port of the second plate heat exchanger is connected to the input channel of the cooled channel, and the second cooled channel port of the second plate heat exchanger is connected to the output channel of the cooled channel; The other end of the defrost channel is connected to the output end of the compression module through the regulating switch, the other end of the reflux channel is connected to the other end of the cooling channel through the refrigeration module, the other end of the cooling channel is connected to the output end of the compression module through the refrigeration module and the regulating switch, and the other end of the recovery channel is connected to the input end of the compression module.

2. The compressed air cooling system with defrosting function according to claim 1, characterized in that: When the first plate heat exchanger is in cooling mode and the second plate heat exchanger is in standby mode, the regulating switch, the second switch unit, and the third switch unit are all in the open state, and the first switch unit, the fourth switch unit, the fifth switch unit, the sixth switch unit, the seventh switch unit, and the eighth switch unit are all in the closed state.

3. The compressed air cooling system with defrosting function according to claim 1, characterized in that: When the first plate heat exchanger and the second plate heat exchanger are both in cooling mode, the regulating switch, the second switch unit, the third switch unit, the sixth switch unit, and the seventh switch unit are all in the open state, and the first switch unit, the fourth switch unit, the fifth switch unit, and the eighth switch unit are all in the closed state.

4. The compressed air cooling system with defrosting function according to claim 1, characterized in that: When the first plate heat exchanger is in cooling mode and the second plate heat exchanger is in defrosting mode, the second switch unit, the third switch unit, the fifth switch unit, and the eighth switch unit are all in the open state, and the regulating switch, the first switch unit, the fourth switch unit, the sixth switch unit, and the seventh switch unit are all in the closed state.

5. The compressed air cooling system with defrosting function according to claim 1, characterized in that: When the first plate heat exchanger is in defrost mode and the second plate heat exchanger is in cooling mode, the first switch unit 81, the fourth switch unit 91, the sixth switch unit 72, and the seventh switch unit 46 are all in the open state, and the regulating switch, the second switch unit 71, the third switch unit 45, the fifth switch unit 82, and the eighth switch unit 92 are all in the closed state.

6. The compressed air cooling system with defrosting function according to claim 1, characterized in that: The first switch unit and the fifth switch unit have the same structure; the first switch unit includes a first connecting pipe, a first one-way valve and a first normally closed solenoid valve; one end of the first connecting pipe is connected to the other end of the defrost channel, and the other end of the first connecting pipe is connected to the first cooling channel port of the first plate heat exchanger; the first one-way valve and the first normally closed solenoid valve are sequentially arranged on the first connecting pipe, and the first one-way valve is used to prevent reverse conduction.

7. The compressed air cooling system with defrosting function according to claim 1, characterized in that: The fourth switch unit and the eighth switch unit have the same structure; the fourth switch unit includes a second one-way valve and a second solenoid valve; the second solenoid valve and the second one-way valve are connected in series to the second cooling channel port of the first plate heat exchanger; the second one-way valve is used to prevent reverse conduction.

8. The compressed air cooling system with defrosting function according to claim 1, characterized in that: A first flow meter is provided at the input end of the cooling channel, and a second flow meter is provided at the output end of the cooled channel. When the difference between the first flow meter and the second flow meter is greater than a set threshold, the first plate heat exchanger switches to the defrost mode and the second plate heat exchanger switches to the refrigeration mode.

9. The compressed air cooling system with defrosting function according to claim 8, characterized in that: When the difference between the first flow meter and the second flow meter is greater than a set threshold, the second plate heat exchanger switches to cooling mode and the regulating switch is turned on; when the second plate heat exchanger cools to the set temperature, the first plate heat exchanger switches to defrosting mode and the regulating switch is turned off.

10. The compressed air cooling system with defrosting function according to claim 1, characterized in that: The compressed air cooling system with defrost function also includes a chassis, which is provided with a first cavity and a second cavity in sequence from top to bottom. The first plate heat exchanger, the second plate heat exchanger, the defrost channel, the cooling channel, and the cooled channel are arranged in the first cavity; the recovery channel, the compression module, the reflux channel, and the refrigeration module are arranged in the second cavity.

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