Refrigerating system and control method thereof

Abstract

The invention provides a refrigerating system and a control method thereof, and the refrigerating system comprises an air cycle machine, an auxiliary cooling system and a backflow structure; the air cycle machine is provided with a turbine outlet, and the turbine outlet is connected with an exhaust channel. The auxiliary cooling system is provided with a condenser; the backflow structure is used for enabling a part of exhaust gas of the exhaust channel to absorb condensation heat released by the condenser and then leading the gas absorbing the condensation heat to the first backflow opening to flow into the exhaust channel. According to the technical scheme, part of exhaust gas of the exhaust channel can absorb condensation heat released by the condenser under the action of the backflow structure, then the temperature rises, the high-temperature gas is guided to the first backflow opening to flow into the exhaust channel, the exhaust channel can be heated, and the ice blockage phenomenon in the exhaust channel is relieved. In addition, the heat accumulator is additionally arranged, so that the heat requirements of the aircraft under different flight working conditions can be met, the ice blockage phenomenon is effectively prevented, meanwhile, waste heat recovery is achieved, and the energy utilization efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration, and in particular relates to a refrigeration system and a control method thereof. Background Art

[0002] At present, in the air circulation refrigeration system of three-wheel high-pressure water removal, engine bleed air is generally used as the high-pressure air source, which is cooled by multi-stage heat exchangers and expanded by turbines before being introduced into the cabin for cooling. However, for high temperature and high humidity conditions, the moisture content of the air is very high, and water will precipitate after the air expands and cools down. The outlet temperature of the turbine is usually below 0°C, and the precipitated water can easily freeze in the exhaust passage at the turbine outlet, causing ice blockage inside the exhaust passage at the turbine outlet, thereby seriously affecting system performance. Summary of the invention

[0003] Therefore, the present invention provides a refrigeration system and a control method thereof, the main technical problem to be solved is: how to alleviate the ice blockage phenomenon in the exhaust passage at the turbine outlet.

[0004] In order to solve the above problems, the present invention provides a refrigeration system, which includes an air cycle machine, an auxiliary cooling system and a reflux structure;

[0005] The air cycle machine has a turbine outlet, and the turbine outlet is connected to an exhaust passage; the exhaust passage has an exhaust port and a first return port; wherein along the exhaust direction of the exhaust passage, the first return port is located at the upstream side of the exhaust port;

[0006] The auxiliary cooling system has a condenser;

[0007] The reflux structure is used to allow a portion of the exhaust gas from the exhaust channel to absorb condensation heat released by the condenser, and then guide the gas after absorbing the condensation heat to the first reflux port to flow into the exhaust channel.

[0008] In some embodiments, the reflux structure includes a first reflux channel, the first reflux channel is connected in parallel with the exhaust channel; the condenser has a heat exchange channel, the heat exchange channel is connected in series to the first reflux channel;

[0009] Among them, the reflux structure guides a part of the exhaust gas from the exhaust channel into the heat exchange channel through the first reflux channel, so as to absorb the condensation heat released by the condenser through the heat exchange channel; the reflux structure also guides the gas after absorbing the condensation heat to the first reflux port through the first reflux channel and flows into the exhaust channel.

[0010] In some embodiments, the refrigeration system further includes a first pump body, which is disposed on the first reflux channel and is used to drive the gas in the first reflux channel to flow toward the first reflux port.

[0011] In some embodiments, the first backflow channel can be opened or closed.

[0012] In some embodiments, the refrigeration system further comprises a heat accumulator, and the heat accumulator is used to recover the condensation heat released by the condenser;

[0013] The heat recovery structure is also used to allow a portion of the exhaust gas from the exhaust channel to absorb the heat stored in the heat accumulator, and then guide the gas after absorbing the heat to the first reflow port to flow into the exhaust channel.

[0014] In some embodiments, the recirculation structure includes a second recirculation channel, and the second recirculation channel is connected in parallel with the exhaust channel;

[0015] The heat accumulator has a heat release channel, and the heat release channel is connected in series to the second reflux channel;

[0016] Among them, the reflux structure guides a part of the exhaust gas from the exhaust channel into the heat release channel through the second reflux channel, so as to absorb the heat stored in the heat accumulator through the heat release channel; the reflux structure also guides the gas after absorbing the heat to the first reflux port through the second reflux channel to flow into the exhaust channel.

[0017] In some embodiments, the refrigeration system further includes a second pump body; the second pump body is disposed on the second reflux channel, and the second pump body is used to drive the gas in the second reflux channel to flow toward the first reflux port.

[0018] In some embodiments, when the refrigeration system further includes a first pump body, the first pump body is disposed on the first reflux channel, and the condenser has a heat exchange channel, which is connected in series to the first reflux channel, the branch connecting the first pump body and the heat exchange channel is a first branch, the heat accumulator has a heat absorption channel, the heat absorption channel is connected in parallel to the first branch, and the two can form a circulation loop.

[0019] In some embodiments, the first reflux channel has a guide port and a second reflux port, the first reflux channel introduces a portion of the exhaust gas from the exhaust channel through the guide port, and guides the gas after heat exchange with the refrigerant to the first reflux port through the second reflux port and flows into the exhaust channel;

[0020] One end of the heat absorption channel and the first branch connected in parallel is a first end, and the other end of the heat absorption channel and the first branch connected in parallel is a second end;

[0021] The refrigeration system further includes a first switch valve and a second switch valve, wherein the first switch valve is arranged on a channel between the first end and the second return port, and the second switch valve is arranged on a channel between the second end and the inlet port.

[0022] In some embodiments, the heat absorption channel and the heat release channel are the same channel; wherein,

[0023] The channel between the first end and the second reflux port is a first channel section, and the first reflux channel and the second reflux channel share the first channel section;

[0024] And / or, the channel between the second end and the drainage port is a second channel section, and the first reflux channel and the second reflux channel share the second channel section.

[0025] In some embodiments, the second backflow channel can be opened or closed.

[0026] In some embodiments, when the refrigeration system further includes a first pump body, the first pump body is disposed on the first reflux channel, and the condenser has a heat exchange channel, the heat exchange channel is connected in series to the first reflux channel, and the branch connected between the first pump body and the heat exchange channel is a first branch, and the heat accumulator has a heat absorption channel, the heat absorption channel is connected in parallel to the first branch,

[0027] The heat absorption channel is located on the second branch section of the second return channel, and the heat absorption channel is connected in parallel with the first branch through the second branch section, wherein the refrigeration system also includes a third switch valve, and the third switch valve is arranged on the second branch section to control the opening or closing of the second return channel.

[0028] In some embodiments, when the heat absorption channel and the heat release channel are the same channel, and the refrigeration system further includes a second pump body, the second pump body is arranged on the second branch section, and the refrigeration system further includes a fourth switch valve, and the fourth switch valve is arranged on the first branch.

[0029] The present invention also provides a control method for the above-mentioned refrigeration system, when the refrigeration system further includes another condenser, the exhaust channel exhausts air through the condensation channel of the other condenser; and the first reflux channel has a drainage port and a second reflux port, one end of the heat absorption channel and the first branch connected in parallel is the first end, and the other end of the two connected in parallel is the second end; the refrigeration system further includes a first switch valve and a second switch valve, the first switch valve is arranged on the channel between the first end and the second reflux port, and the second switch valve is arranged on the channel between the second end and the drainage port, the control method includes:

[0030] When the refrigeration system is applied to an aircraft and the aircraft is in a climbing or cruising operation stage, if the pressure difference between the two ends of the condensing channel of the other condenser is less than a preset value, the first switch valve and the second switch valve are closed, the third switch valve and the fourth switch valve are opened, and the first pump body or the second pump body is turned on; otherwise, the first switch valve, the second switch valve and the fourth switch valve are opened, the third switch valve is closed, and the first pump body is turned on;

[0031] And / or, when the refrigeration system is applied to an aircraft and the aircraft is in the ground or landing operation stage, if the pressure difference between the two ends of the condensation channel of the other condenser is greater than or equal to a preset value, the first switch valve, the second switch valve and the third switch valve are opened, the fourth switch valve is closed, and the second pump body is opened; otherwise, at least one of the first switch valve and the second switch valve is closed.

[0032] A refrigeration system and a control method thereof provided by the present invention have the following beneficial effects:

[0033] 1. A part of the exhaust gas in the exhaust channel can absorb the condensation heat released by the condenser under the action of the reflux structure and then its temperature rises. The high-temperature gas is re-introduced to the first reflux port and flows into the exhaust channel, which can heat the exhaust channel and alleviate the ice blockage in the exhaust channel.

[0034] 2. When the refrigeration system of the present invention is applied to an aircraft, the heat demand of the aircraft under different flight conditions can be met by adding a heat accumulator. While effectively preventing ice blockage, waste heat recovery is also achieved, greatly improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0036] Figure 1 is a structural diagram of a refrigeration system provided by an embodiment of the present invention;

[0037] Figure 2 yes Figure 1 Schematic diagram of part of the refrigeration system.

[0038] The accompanying drawings are marked as follows:

[0039] 1. turbine outlet; 2. exhaust channel; 3. condenser; 4. first return channel; 5. second return channel; 6. heat accumulator; 7. first pump body; 8. first switch valve; 9. second switch valve; 10. second pump body; 11. third switch valve; 12. fourth switch valve; 13. another condenser; 14. differential pressure sensor; 15. primary heat exchanger; 16. secondary heat exchanger; 17. regenerator; 18. water separator; 19. turbine; 20. compressor structure; 21. fan; 22. first throttling device; 23. Intermediate heat exchanger; 24. Second throttling device; 25. Evaporator; 26. Low-pressure compressor; 27. Intermediate cavity; 28. High-pressure compressor; 29. ​​Cold unit; 31. Heat exchange channel; 61. Heat absorption channel; 62. Heat release channel; 63. Heat storage material; 41. First branch; 42. First channel section; 43. Second channel section; 51. Second branch section; 401. Second reflux port; 402. Drain port; 403. First end; 404. Second end; 131. Condensation channel of another condenser. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0043] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0044] See also Figure 1-2 As shown, according to an embodiment of the present invention, a refrigeration system is provided, which includes an air cycle machine, an auxiliary cooling system and a reflow structure. The air cycle machine has a turbine outlet 1, the turbine outlet 1 is connected to an exhaust channel 2, and the turbine outlet 1 is exhausted through the exhaust channel 2. The exhaust channel has an exhaust port and a first reflow port 21. Among them, along the exhaust direction of the exhaust channel 2, the first reflow port 21 is located on the upstream side of the exhaust port. The auxiliary cooling system has a condenser 3. The reflow structure is used to make a part of the exhaust gas of the exhaust channel 2 absorb the condensation heat released by the condenser 3, and then guide the gas after absorbing the condensation heat to the first reflow port 21 to flow into the exhaust channel 2.

[0045] In the above example, a portion of the exhaust gas from the exhaust channel 2 absorbs the condensation heat released by the condenser 3 under the action of the reflux structure and its temperature increases. The high-temperature gas is redirected to the first reflux port 21 and flows into the exhaust channel 2, which can heat the exhaust channel 2 and alleviate the ice blockage in the exhaust channel 2.

[0046] Among them, the technical solution of the present invention not only effectively alleviates the ice blockage phenomenon in the exhaust passage 2, but also realizes waste heat recovery, greatly improving the energy utilization efficiency.

[0047] In some embodiments, the first reflow port 21 and the turbine outlet 1 may be the same port, so that the gas after absorbing heat can flow into the exhaust passage 2 from the turbine outlet 1 to heat and de-ice the entire exhaust passage 2, thereby further improving the de-icing effect on the exhaust passage 2.

[0048] It should be noted here that: Figure 1 As shown, the refrigeration system of the present invention may also include a turbine 19, a primary heat exchanger 15, a secondary heat exchanger 16, a regenerator 17, a fan 21, a water separator 18 and another condenser 13. The exhaust passage 2 is exhausted through the condensation passage 131 of another condenser. The air cycle machine has a compressor structure 20. Among them, the hot air from the upstream first enters the primary heat exchanger 15 for cooling, then enters the compressor structure 20, and enters the secondary heat exchanger 16 for a second cooling after being pressurized. The primary heat exchanger 15 and the secondary heat exchanger 16 form a two-stage heat exchanger, and the cold side of the two-stage heat exchanger is cooled by ram air, which comes from the bleed air of the engine. The cold side outlet of the two-stage heat exchanger is collected by the ram air conversion valve and exhausted through the fan 21. The air coming out of the hot side of the secondary heat exchanger 16 passes through the regenerator 17, then enters the heat exchange channel of another condenser 13 for heat exchange, and then enters the water separator 18, which separates and discharges the free water in the air. The separated air enters the regenerator 17 to evaporate the unseparated free water, then enters the turbine 19 for expansion and cooling, enters the exhaust channel 2 from the turbine outlet 1, and then is discharged through the condensation channel 131 of another condenser and sent to the cabin.

[0049] like Figure 1 As shown, the auxiliary cooling system also includes a high-pressure compressor 28, a low-pressure compressor 26, an intermediate cavity 27, an intermediate heat exchanger 23, an evaporator 25, and a first throttling device 22 and a second throttling device 24. Both the first throttling device 22 and the second throttling device 24 can be throttling valves, etc. The working principle of the auxiliary cooling system is as follows: the outlet of the condenser 3 is divided into two routes, one route (main route) enters the inner side of the coil of the intermediate heat exchanger 23, and the other route (branch route) enters the outer side of the coil of the intermediate heat exchanger 23 after being depressurized by the first throttling device 22, cooling the main refrigerant flowing through the coil and improving the supercooling degree of the main refrigerant. The cooled main refrigerant is depressurized by the second throttling device 24 and enters the evaporator 25 for evaporation. The evaporated refrigerant gas enters the air intake of the low-pressure compressor 26 and is discharged to the intermediate cavity 27 after being compressed. After the branch refrigerant on the outside of the coil of the intermediate heat exchanger 23 is completely evaporated, it enters the intermediate cavity 27, mixes with the exhaust gas of the low-pressure compressor 26, and enters the suction port of the high-pressure compressor 28. After being compressed, it is discharged into the condenser 3 and condensed into liquid refrigerant, thus completing the entire cycle. In the entire cycle, the evaporator 25 and the cold unit 29 complete heat exchange in the evaporator 25 to achieve cooling of the terminal heat load.

[0050] In order to realize the function of the aforementioned reflux structure, in some embodiments, as Figure 2As shown, the aforementioned reflux structure may include a first reflux channel 4, which is connected in parallel with the exhaust channel 2. The aforementioned condenser 3 has a heat exchange channel 31, which is connected in series to the first reflux channel 4. The aforementioned reflux structure guides a portion of the exhaust gas from the exhaust channel 2 into the heat exchange channel 31 through the first reflux channel 4, so as to absorb the condensation heat released by the condenser 3 through the heat exchange channel 31. The reflux structure also guides the gas after absorbing the condensation heat to the first reflux port 21 through the first reflux channel 4 and flows into the exhaust channel 2.

[0051] Among them, the above-mentioned condenser 3 has a condensation channel 32, and the refrigerant in the auxiliary cooling system flows through the condensation channel 32 to release condensation heat. When a part of the exhaust gas from the exhaust channel 2 flows through the heat exchange channel 31, it can exchange heat with the refrigerant in the condensation channel 32 through the heat exchange channel 31 to absorb the condensation heat released by the refrigerant.

[0052] In the above example, the first reflux channel 4 may be a pipe structure. The first reflux channel 4 introduces a portion of the exhaust gas from the exhaust channel 2 into the condenser 3 to absorb condensation heat, and then introduces the gas after absorbing the condensation heat to the first reflux port 21 to flow into the exhaust channel 2, thereby realizing the function of the aforementioned reflux structure.

[0053] In some embodiments, Figure 2 As shown, the aforementioned refrigeration system further includes a first pump body 7, which is disposed on the first reflow channel 4, and is used to drive the gas in the first reflow channel 4 to flow toward the first reflow port 21. Specifically, the first pump body 7 is used to drive a portion of the exhaust gas in the exhaust channel 2 to flow into the heat exchange channel 31, and to drive the gas in the first reflow channel 4 that has absorbed the condensation heat to flow to the first reflow port 21 and flow into the exhaust channel 2.

[0054] In the above example, the first pump body 7 can provide power for the flow of gas in the first reflux channel 4, which is beneficial for a part of the exhaust gas from the exhaust channel 2 to flow smoothly into the heat exchange channel 31, and the gas after absorbing the condensation heat in the first reflux channel 4 can flow smoothly to the first reflux port 21 and flow into the exhaust channel 2.

[0055] In some embodiments, the first reflux channel 4 can be opened or closed, so that it is possible to use the condensation heat released by the condenser 3 to perform de-icing depending on the situation. Specifically, when ice blockage occurs in the exhaust channel 2, the first reflux channel 4 can be opened; otherwise, the first reflux channel 4 can be closed.

[0056] In some embodiments, Figure 2As shown, the aforementioned refrigeration system may further include a heat accumulator 6, which is used to recover the condensation heat released by the condenser 3. The heat recovery structure is also used to make a part of the exhaust gas of the exhaust channel 2 absorb the heat stored in the heat accumulator 6, and then guide the gas after absorbing the heat to the first reflow port 21 to flow into the exhaust channel 2.

[0057] In the above example, a portion of the exhaust gas from the exhaust channel 2 absorbs the heat stored in the heat accumulator 6 under the action of the reflux structure and its temperature increases. The high-temperature gas is redirected to the first reflux port 21 and flows into the exhaust channel 2, which can heat the exhaust channel 2 and alleviate the ice blockage in the exhaust channel 2.

[0058] Among them, when the aforementioned refrigeration system is applied to an aircraft, the heat demand of the aircraft under different flight conditions can be met by adding a heat accumulator 6, which can effectively prevent ice blockage and realize waste heat recovery, thereby greatly improving energy utilization efficiency.

[0059] In order to realize the function of the aforementioned reflux structure, in some embodiments, as Figure 2 As shown, the aforementioned reflow structure may include a second reflow channel 5, which is connected in parallel with the aforementioned exhaust channel 2. The aforementioned heat accumulator 6 has a heat release channel 62, which is connected in series to the second reflow channel 5. The reflow structure guides a portion of the exhaust gas from the exhaust channel 2 into the heat release channel 62 through the second reflow channel 5, so as to absorb the heat stored in the heat accumulator 6 through the heat release channel 62. The reflow structure also guides the gas after absorbing the heat to the first reflow port 21 through the second reflow channel 5 and flows into the exhaust channel 2.

[0060] In the above example, the second recirculation channel 5 may be a pipe structure. The second recirculation channel 5 introduces a portion of the exhaust gas from the exhaust channel 2 into the heat release channel 62 of the heat accumulator 6 to absorb the heat stored in the heat accumulator 6, and then introduces the heat-absorbed gas to the first recirculation port 21 to flow into the exhaust channel 2, thereby realizing the function of the aforementioned recirculation structure.

[0061] In some embodiments, the aforementioned refrigeration system further includes a second pump body 10. The second pump body 10 is disposed on the second reflux channel 5, and the second pump body 10 is used to drive the gas in the second reflux channel 5 to flow toward the first reflux port 21. Specifically, the second pump body 10 is used to drive a portion of the exhaust gas of the exhaust channel 2 to flow into the heat release channel 62, and drive the gas in the second reflux channel 5 that has absorbed heat to flow to the first reflux port 21 and flow into the exhaust channel 2.

[0062] In the above example, the second pump body 10 can provide power for the flow of gas in the second recirculation channel 5, which is beneficial for a part of the exhaust gas from the exhaust channel 2 to flow smoothly into the heat release channel 62, and the gas after absorbing heat in the second recirculation channel 5 can flow smoothly to the first recirculation port 21 and flow into the exhaust channel 2.

[0063] In some embodiments, Figure 2 As shown, when the refrigeration system also includes a first pump body 7, the first pump body 7 is arranged on the first reflux channel 4, and the condenser 3 has a heat exchange channel 31, and the heat exchange channel 31 is connected in series to the first reflux channel 4, the branch connected by the first pump body 7 and the heat exchange channel 31 is the first branch 41, and the aforementioned heat accumulator 6 has a heat absorption channel 61, which is connected in parallel with the first branch 41, and the two can form a circulation loop.

[0064] In the above example, since the heat absorption channel 61 of the heat accumulator 6 can form a circulation loop with the heat exchange channel 31 of the condenser 3 and the first pump body 7, when the first pump body 7 is started, the gas after heat exchange through the heat exchange channel 31 can be driven to flow through the heat absorption channel 61 of the heat accumulator 6, so that the heat accumulator 6 absorbs heat through the heat absorption channel 61 for storage.

[0065] In some embodiments, the aforementioned heat storage device 6 has a heat storage material 63 therein, and the heat storage material 63 can absorb heat through the heat absorption channel 61 for storage. The heat storage material 63 can also release the stored heat through the heat release channel 62.

[0066] In order to achieve the effect of forming a circulation loop between the heat absorption channel 61 and the first branch 41, in some embodiments, as Figure 2 As shown, the aforementioned first return channel 4 may have a guide port 402 and a second return port 401, wherein the guide port 402 may be directly connected to the aforementioned exhaust port 22, and the second return port 401 may be directly connected to the aforementioned first return port 21. The first return channel 4 introduces a portion of the exhaust gas of the exhaust channel 2 through the guide port 402, and guides the gas after heat exchange with the refrigerant to the first return port 21 through the second return port 401 to flow into the exhaust channel 2. One end of the aforementioned heat absorption channel 61 and the first branch 41 connected in parallel is the first end 403, and the other end of the two connected in parallel is the second end 404. The refrigeration system of the present invention also includes a first switch valve 8 and a second switch valve 9, the first switch valve 8 is arranged on the channel between the first end 403 and the second return port 401, and the second switch valve 9 is arranged on the channel between the second end 404 and the guide port 402.

[0067] In the above example, when the first switch valve 8 and the second switch valve 9 are both closed, the first pump body 7 is opened at this time, so that the heat absorption channel 61 and the first branch 41 can form a circulation loop, thereby achieving the effect of the aforementioned heat absorption channel 61 and the first branch 41 forming a circulation loop.

[0068] In some embodiments, the aforementioned heat absorption channel 61 and heat release channel 62 are the same channel, which can simplify the structure and reduce the cost of the heat accumulator 6.

[0069] Among them, Figure 2 As shown, the channel between the aforementioned first end 403 and the second return port 401 is the first channel section 42, and the aforementioned first return channel 4 and second return channel 5 can share the first channel section 42, which can simplify the structure of the first return channel 4 and the second return channel 5 and reduce costs.

[0070] like Figure 2 As shown, the channel between the aforementioned second end 404 and the guide port 402 is the second channel section 43, and the aforementioned first return channel 4 and second return channel 5 can share the second channel section 43, which can simplify the structure of the first return channel 4 and the second return channel 5 and reduce costs.

[0071] In some embodiments, the second recirculation channel 5 can be opened or closed, so that it is possible to use the heat stored in the heat accumulator 6 for deicing depending on the situation. Specifically, when ice blockage occurs in the exhaust passage 2, the second recirculation channel 5 can be opened; otherwise, the second recirculation channel 5 can be closed.

[0072] In order to achieve the effect that the second reflux channel 5 can be opened or closed, in some embodiments, as Figure 2 As shown, when the refrigeration system further includes a first pump body 7, the first pump body 7 is arranged on the first return channel 4, and the condenser 3 has a heat exchange channel 31, the heat exchange channel 31 is connected in series on the first return channel 4, and the branch connected by the first pump body 7 and the heat exchange channel 31 is the first branch 41, and the heat accumulator 6 has a heat absorption channel 61, and the heat absorption channel 61 is connected in parallel with the first branch 41, the heat absorption channel 61 is located on the second branch section 51 of the second return channel 5, and the heat absorption channel 61 is connected in parallel with the aforementioned first branch 41 through the second branch section 51. Among them, the refrigeration system also includes a third switch valve 11, which is arranged on the second branch section 51 to control the opening or closing of the second return channel 5.

[0073] In some embodiments, when the aforementioned heat absorption channel 61 and heat release channel 62 are the same channel, and the refrigeration system also includes a second pump body 10, the second pump body 10 is arranged on the second branch section 51, and the refrigeration system also includes a fourth switch valve 12, and the fourth switch valve 12 is arranged on the first branch 41.

[0074] In the above example, the second pump body 10, the first switch valve 8, the second switch valve 9, the third switch valve 11 and the fourth switch valve 12 cooperate to open the second return channel 5 alone, so that the second return channel 5 uses the heat stored in the heat accumulator 6 to heat and de-ice the exhaust channel 2. Specifically, when it is necessary to use the heat of the heat accumulator 6 alone to heat and de-ice the exhaust channel 2, the first switch valve 8, the second switch valve 9 and the third switch valve 11 can be opened, and the fourth switch valve 12 can be closed. At this time, the first return channel 4 is closed, so that the second return channel 5 is opened alone, so that the heat of the heat accumulator 6 can be used alone to heat and de-ice the exhaust channel 2.

[0075] In some embodiments, the first switch valve 8, the second switch valve 9, the third switch valve 11 and the fourth switch valve 12 may all be solenoid valves or the like.

[0076] The present invention also provides a control method for the above-mentioned refrigeration system, when the refrigeration system further includes another condenser 13, the exhaust channel 2 is exhausted through the condensation channel 131 of the other condenser; and the first return channel 4 has a guide port 402 and a second return port 401, one end of the heat absorption channel 61 and the first branch 41 connected in parallel is the first end 403, and the other end of the two connected in parallel is the second end 404; the refrigeration system further includes a first switch valve 8 and a second switch valve 9, the first switch valve 8 is arranged on the channel between the first end 403 and the second return port 401, and the second switch valve 9 is arranged on the channel between the second end 404 and the guide port 402, the above-mentioned control method includes:

[0077] When the refrigeration system is applied to an aircraft and the aircraft is in a climbing or cruising operation stage, if the pressure difference between the two ends of the condensing channel 131 of the other condenser is less than a preset value, the first switch valve 8 and the second switch valve 9 are closed, the third switch valve 11 and the fourth switch valve 12 are opened, and the first pump body 7 or the second pump body 10 is opened; otherwise, the first switch valve 8, the second switch valve 9 and the fourth switch valve 12 are opened, the third switch valve 11 is closed, and the first pump body 7 is opened.

[0078] In the above example, when the aircraft is in the climbing or cruising operation stage, the load of the auxiliary cooling system is relatively large and the condensation waste heat is more. At this time, if there is no ice blockage in the exhaust channel 2, that is, the pressure difference between the two ends of the condensation channel 131 of the other condenser is less than the preset value, the excess condensation heat can be stored in the heat accumulator 6, that is, the first switch valve 8 and the second switch valve 9 are closed, the third switch valve 11 and the fourth switch valve 12 are opened, and the first pump body 7 or the second pump body 10 is turned on. At this time, the heat absorption channel 61 of the heat accumulator and the heat exchange channel 31 of the condenser form a circulation loop. After the gas absorbs the condensation heat of the condenser 3, it releases heat when flowing through the heat absorption channel 61 of the heat accumulator, and the heat accumulator 6 absorbs heat for storage. If the exhaust channel 2 is blocked by ice, that is, the pressure difference between the two ends of the condensation channel 131 of another condenser is greater than or equal to the preset value, it is necessary to use the waste heat of condensation to heat and de-ice the exhaust channel 2, that is, open the first switch valve 8, the second switch valve 9 and the fourth switch valve 12, close the third switch valve 11, and turn on the first pump body 7. The first pump body 7 drives part of the exhaust gas of the exhaust channel 2 to flow into the heat exchange channel 31 of the condenser to absorb the condensation heat, and then the gas after absorbing the condensation heat flows along the first reflux channel 4 to the first reflux port 21 and flows into the exhaust channel 2, so as to heat and de-ice the exhaust channel 2.

[0079] When the refrigeration system is applied to an aircraft and the aircraft is in the ground or landing operation stage, if the pressure difference between the two ends of the condensation channel 131 of the other condenser is greater than or equal to a preset value, the first switch valve 8, the second switch valve 9 and the third switch valve 11 are opened, the fourth switch valve 12 is closed, and the second pump body 10 is opened; otherwise, at least one of the first switch valve 8 and the second switch valve 9 is closed.

[0080] In the above example, when the aircraft is in the ground or landing operation stage, the load of the auxiliary cooling system is relatively small. At this time, if the exhaust channel 2 is blocked by ice, that is, the pressure difference between the two ends of the condensation channel 131 of another condenser is greater than or equal to the preset value, it is necessary to use the heat stored in the heat accumulator 6 to de-ice the exhaust channel 2, that is, open the first switch valve 8, the second switch valve 9 and the third switch valve 11, close the fourth switch valve 12, and open the second pump body 10. At this time, the second pump body 10 drives part of the exhaust gas of the exhaust channel 2 to flow into the heat release channel 62 of the heat accumulator to absorb the heat stored in the heat accumulator 6, and then the gas after absorbing the heat flows along the second return channel 5 to the first return port 21 and flows into the exhaust channel 2, heating and de-icing the exhaust channel 2. If the exhaust channel 2 is not blocked by ice, that is, the pressure difference between the two ends of the condensation channel 131 of another condenser is less than the preset value, the exhaust channel 2 is exhausted normally, that is, at least one of the first switch valve 8 and the second switch valve 9 is closed, so that the first return channel 4 and the second return channel 5 are both closed.

[0081] Among them, through the above-mentioned control method, the heat storage of the heat accumulator 6 can meet the heat demand under different flight conditions.

[0082] It should be noted that the aforementioned refrigeration system may include a pressure difference sensor 14 to detect the pressure difference between the two ends of the condensation channel 131 of another condenser through the pressure difference sensor 14. In a specific application example, the aforementioned preset value may be 5-9 kPa.

[0083] Among them, the refrigeration system of the present invention makes full use of the condensation waste heat in the auxiliary cooling system to provide heat for the air at the turbine outlet 1, thereby heating the cold air at the turbine outlet 1, and adding a heat accumulator 6 to meet the heat requirements of the aircraft under different flight conditions. While effectively preventing ice blockage, it also realizes waste heat recovery, greatly improving energy utilization efficiency.

[0084] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A refrigeration system, characterized in that: Includes air cycle machine, auxiliary cooling system and return structure; The air cycle machine has a turbine outlet (1), and the turbine outlet (1) is connected to an exhaust passage (2); the exhaust passage has an exhaust port (22) and a first return port (21); wherein, along the exhaust direction of the exhaust passage (2), the first return port (21) is located on the upstream side of the exhaust port (22); The auxiliary cooling system comprises a condenser (3); The reflux structure is used to allow a portion of the exhaust gas from the exhaust channel (2) to absorb the condensation heat released by the condenser (3), and then guide the gas after absorbing the condensation heat to the first reflux port (21) to flow into the exhaust channel (2).

2. The refrigeration system according to claim 1, characterized in that: The reflux structure comprises a first reflux channel (4), the first reflux channel (4) being connected in parallel with the exhaust channel (2); the condenser (3) having a heat exchange channel (31), the heat exchange channel (31) being connected in series to the first reflux channel (4); The reflux structure guides a portion of the exhaust gas from the exhaust channel (2) into the heat exchange channel (31) through the first reflux channel (4), so as to absorb the condensation heat released by the condenser (3) through the heat exchange channel (31); the reflux structure also guides the gas after absorbing the condensation heat to the first reflux port (21) through the first reflux channel (4) to flow into the exhaust channel (2).

3. The refrigeration system according to claim 2, characterized in that: It also comprises a first pump body (7), wherein the first pump body (7) is arranged on the first reflux channel (4), and the first pump body (7) is used to drive the gas in the first reflux channel (4) to flow towards the first reflux port (21).

4. The refrigeration system according to claim 2 or 3, characterized in that: The first reflux channel (4) can be opened or closed.

5. The refrigeration system according to any one of claims 1 to 3, characterized in that: It also includes a heat accumulator (6), wherein the heat accumulator (6) is used to recover the condensation heat released by the condenser (3); The heat recovery structure is also used to allow a portion of the exhaust gas from the exhaust channel (2) to absorb the heat stored in the heat accumulator (6), and then guide the gas after absorbing the heat to the first reflow port (21) to flow into the exhaust channel (2).

6. The refrigeration system according to claim 5, characterized in that: The reflux structure comprises a second reflux channel (5), wherein the second reflux channel (5) is connected in parallel with the exhaust channel (2); The heat accumulator (6) has a heat release channel (62), and the heat release channel (62) is connected in series to the second reflux channel (5); The reflux structure guides a portion of the exhaust gas from the exhaust channel (2) into the heat release channel (62) through the second reflux channel (5), so as to absorb the heat stored in the heat accumulator (6) through the heat release channel (62); the reflux structure also guides the gas after absorbing the heat to the first reflux port (21) through the second reflux channel (5) to flow into the exhaust channel (2).

7. The refrigeration system according to claim 6, characterized in that: It also includes a second pump body (10); the second pump body (10) is arranged on the second reflux channel (5), and the second pump body (10) is used to drive the gas in the second reflux channel (5) to flow toward the first reflux port (21).

8. The refrigeration system according to claim 6 or 7, characterized in that: When the refrigeration system further comprises a first pump body (7), the first pump body (7) is arranged on the first reflux channel (4), and the condenser (3) has a heat exchange channel (31), and the heat exchange channel (31) is connected in series to the first reflux channel (4), the branch connecting the first pump body (7) and the heat exchange channel (31) is a first branch (41), and the heat accumulator (6) has a heat absorption channel (61), and the heat absorption channel (61) is connected in parallel with the first branch (41), and the two can form a circulation loop.

9. The refrigeration system according to claim 8, characterized in that: The first return channel (4) has a guide port (402) and a second return port (401); the first return channel (4) introduces a portion of the exhaust gas from the exhaust channel (2) through the guide port (402), and introduces the gas after heat exchange with the refrigerant to the first return port (21) through the second return port (401) to flow into the exhaust channel (2); One end of the heat absorption channel (61) and the first branch (41) connected in parallel is a first end (403), and the other end of the heat absorption channel (61) and the first branch (41) connected in parallel is a second end (404); The refrigeration system further comprises a first switch valve (8) and a second switch valve (9), wherein the first switch valve (8) is arranged on the channel between the first end (403) and the second return port (401), and the second switch valve (9) is arranged on the channel between the second end (404) and the inlet port (402).

10. The refrigeration system according to claim 9, characterized in that: The heat absorption channel (61) and the heat release channel (62) are the same channel; wherein, The channel between the first end (403) and the second reflux port (401) is a first channel section (42), and the first reflux channel (4) and the second reflux channel (5) both share the first channel section (42); And / or, the channel between the second end (404) and the drainage port (402) is a second channel section (43), and the first reflux channel (4) and the second reflux channel (5) both share the second channel section (43).

11. The refrigeration system according to any one of claims 6-7, 9-10, characterized in that: The second reflux channel (5) can be opened or closed.

12. The refrigeration system according to claim 11, characterized in that: When the refrigeration system further comprises a first pump body (7), the first pump body (7) is arranged on the first reflux channel (4), the condenser (3) comprises a heat exchange channel (31), the heat exchange channel (31) is connected in series to the first reflux channel (4), and the branch connecting the first pump body (7) and the heat exchange channel (31) is a first branch (41), and the heat accumulator (6) comprises a heat absorption channel (61), the heat absorption channel (61) is connected in parallel to the first branch (41), The heat absorption channel (61) is located on the second branch section (51) of the second return channel (5), and the heat absorption channel (61) is connected in parallel with the first branch (41) through the second branch section (51), wherein the refrigeration system further comprises a third switch valve (11), and the third switch valve (11) is arranged on the second branch section (51) to control the opening or closing of the second return channel (5).

13. The refrigeration system according to claim 12, characterized in that: When the heat absorption channel (61) and the heat release channel (62) are the same channel, and the refrigeration system further includes a second pump body (10), the second pump body (10) is arranged on the second branch section (51), and the refrigeration system further includes a fourth switch valve (12), and the fourth switch valve (12) is arranged on the first branch (41).

14. A method for controlling a refrigeration system according to claim 13, characterized in that: When the refrigeration system further comprises another condenser (13), the exhaust channel (2) exhausts air through the condensation channel (131) of the other condenser; and the first return channel (4) has a flow inlet (402) and a second return channel (401), one end of the heat absorption channel (61) and the first branch (41) connected in parallel is the first end (403), and the other end of the heat absorption channel (61) and the first branch (41) connected in parallel is the second end (404); and the refrigeration system further comprises a first switch valve (8) and a second switch valve (9), the first switch valve (8) being arranged on the channel between the first end (403) and the second return channel (401), and the second switch valve (9) being arranged on the channel between the second end (404) and the flow inlet (402), the control method comprises: When the refrigeration system is applied to an aircraft and the aircraft is in a climbing or cruising operation stage, if the pressure difference between the two ends of the condensing channel (131) of the other condenser is less than a preset value, the first switch valve (8) and the second switch valve (9) are closed, the third switch valve (11) and the fourth switch valve (12) are opened, and the first pump body (7) or the second pump body (10) is turned on; otherwise, the first switch valve (8), the second switch valve (9) and the fourth switch valve (12) are opened, the third switch valve (11) is closed, and the first pump body (7) is turned on; And / or, when the refrigeration system is applied to an aircraft and the aircraft is in a ground or landing operation stage, if the pressure difference between the two ends of the condensation channel (131) of the other condenser is greater than or equal to a preset value, the first switch valve (8), the second switch valve (9) and the third switch valve (11) are opened, the fourth switch valve (12) is closed, and the second pump body (10) is opened; otherwise, at least one of the first switch valve (8) and the second switch valve (9) is closed.

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