Heat exchange system and heat exchange method
By introducing a heat exchange system into the refrigeration system, the heat exchange between refrigerant and lubricating oil is used to solve the problem of reducing the viscosity of lubricating oil, the overheating and lubricating performance of the compressor is improved, and the service life of the compressor is extended.
Patent Information
- Application Number
- CN202410114501.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-07-29
AI Technical Summary
In the prior art, when the discharge superheat of the refrigerant is less than 4-5K, the separation effect of the oil separator is poor, resulting in a decrease in the viscosity of the lubricant, affecting the lubricating performance and life of the compressor, and the high-temperature lubricant temperature will aggravate wear.
By introducing a heat exchange system into the refrigeration system, including heat exchangers, input pipelines, output pipelines and regulation equipment, the heat exchange between refrigerant and lubricating oil is used to increase the overheating of the refrigerant and reduce the lubricating oil temperature, and improve lubricating performance.
It improves the suction overheat of the compressor, enhances the viscosity of lubricating oil, reduces wear, and extends the service life of the compressor. At the same time, it is simple in structure and low in cost, and is suitable for various refrigeration systems.
Smart Images
Figure CN120385173A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of refrigeration, and particularly to a heat exchange system and a heat exchange method for the heat exchange system. Background Art
[0002] In a refrigeration system, after the refrigerant flows through the compressor and is compressed, it is in a high-temperature and high-pressure state. When it exits the compressor, it has a high flow rate and temperature. The lubricating oil in the compressor will be mixed with the refrigerant gas in the form of oil vapor or particles under the action of high temperature. In the prior art, an oil separator is arranged on the output side of the compressor to separate the lubricating oil in the refrigerant gas.
[0003] However, in the prior art, when the discharge superheat of the refrigerant is lower than 4 - 5K, the performance of the oil separator is very poor, affecting the separation effect. A large amount of refrigerant will dissolve in the lubricating oil, resulting in a decrease in the viscosity of the lubricating oil. Moreover, in some refrigeration systems, the temperature at the outlet of the oil separator can reach 90°C or higher. The high temperature will also reduce the viscosity of the lubricating oil returning to the compressor, which may lead to increased wear of the equipment components in the compressor, shortening its service life, and even causing damage to components such as bearings in the compressor. Summary of the Invention
[0004] In view of the above problems, the present application provides a heat exchange system and a heat exchange method. The heat exchange system can increase the suction superheat of the refrigerant and at the same time reduce the temperature of the lubricating oil, thereby improving the heat dissipation effect of the bearing, increasing the viscosity and lubrication performance of the lubricating oil, and improving the performance and service life of the compressor.
[0005] On the one hand, in the technical solution of the present application, a heat exchange system is provided, which includes a compressor, an evaporator, a heat exchanger, an input pipeline, a first regulating device, and an output pipeline. Refrigerant flows through the evaporator, and a heat exchange pipeline is arranged in the heat exchanger. The input pipeline is respectively connected to the evaporator and the heat exchange pipeline. The first regulating device is arranged on the input pipeline to pump the refrigerant from the evaporator to the heat exchange pipeline. The output pipeline is respectively connected to the suction port of the compressor and the heat exchange pipeline.
[0006] Optionally, in the technical solution of the present application, the heat exchange system further includes a second regulating device, and the second regulating device is arranged on the output pipeline.
[0007] Optionally, in the technical solution of the present application, the heat exchange pipeline includes a primary side pipeline and a secondary side pipeline. The heat exchange system further includes an oil separator. The mixture of oil and refrigerant from the oil separator flows through the primary side pipeline; the refrigerant from the input pipeline flows through the secondary side pipeline.
[0008] Optionally, in the technical solution of the present application, the temperature difference between the refrigerant in the input pipeline and the output pipeline is in the range of 20 - 40 °C, and the temperature difference between the oil and refrigerant mixture before and after flowing through the heat exchange pipeline is in the range of 20 - 50 °C.
[0009] Optionally, in the technical solution of the present application, the first regulating device and / or the second regulating device are configured as an air pump or a flow regulating valve.
[0010] On the other hand, in the technical solution of the present application, a heat exchange method is further provided, which is applied to the above heat exchange system. The heat exchange method includes: a heat exchange step, where the refrigerant from the input pipeline is pumped to the secondary pipeline of the heat exchange pipeline and exchanges heat with the oil and refrigerant mixture flowing through the primary pipeline of the heat exchange pipeline; an exhaust step, where the heat-exchanged refrigerant is discharged to the suction side of the compressor via the output pipeline.
[0011] Optionally, in the technical solution of the present application, the heat exchange method further includes an adjustment step, where the refrigerant pressure or refrigerant flow rate in the input pipeline and / or the output pipeline is adjusted respectively through the first regulating device provided in the input pipeline and / or the second regulating device provided in the output pipeline.
[0012] Optionally, in the technical solution of the present application, in the heat exchange method, the temperature of the refrigerant in the output pipeline rises by 20 - 40 °C relative to the temperature of the refrigerant in the input pipeline.
[0013] Optionally, in the technical solution of the present application, in the heat exchange method, the temperature difference between the oil and refrigerant mixture before and after flowing through the heat exchange pipeline is in the range of 20 - 50 °C.
[0014] In the technical solution of the present application, a part of the refrigerant in the evaporator exchanges heat and is heated up through the secondary pipeline of the heat exchange pipeline in the heat exchanger. At the suction port of the compressor (the outlet of the evaporator), the heat-exchanged and heated refrigerant is mixed with the refrigerant discharged from the outlet of the evaporator, so that the temperature of the refrigerant when flowing into the suction port of the compressor increases. As a result, the difference between the temperature of the refrigerant when flowing into the suction port of the compressor and the evaporation temperature of the refrigerant increases, that is, the superheat degree of the refrigerant increases, so as to avoid the refrigerant entering the compressor in a partially liquid state due to insufficient superheat degree and causing liquid hammer. At the same time, the exhaust superheat degree of the compressor is also increased, improving the oil separation efficiency of the oil separator. On the other hand, the high-temperature and high-pressure oil and refrigerant mixture from the oil separator flows through the primary pipeline of the heat exchange pipeline in the heat exchanger and exchanges heat with the refrigerant in the secondary pipeline of the heat exchange pipeline in the heat exchanger, so that the temperature of the lubricating oil is reduced and the viscosity is increased. While improving the bearing temperature, the lubrication effect is effectively improved, the wear during the operation of the compressor is reduced, and the service life of the compressor is extended.
[0015] In the technical solution of this application, no special equipment is added. Instead, only a heat exchanger and corresponding pipelines are set up, and the above technical effects are achieved with a simple design. Description of the Drawings
[0016] Figure 1 It is a schematic diagram of the principle of a refrigeration system in the prior art.
[0017] Figure 2 It is a schematic diagram of a refrigeration system provided in the embodiment of the present invention.
[0018] Figure 3 It is a schematic diagram of a heat exchange system provided in the embodiment of the present invention.
[0019] Figure 4 It is a flowchart of a heat exchange method provided in the embodiment of this application.
[0020] Description of the reference numerals: 100 - refrigeration system, 101 - compressor, 102 - condenser, 103 - expansion valve, 104 - evaporator, 105 - oil separator, 200 - refrigeration system, 201 - compressor, 202 - condenser, 203 - expansion valve, 204 - evaporator, 205 - oil separator, 1 - heat exchange system, 2 - heat exchanger, 3 - input pipeline, 4 - first regulating device, 5 - output pipeline, 6 - second regulating device, compressor suction port A1, compressor outlet A2, compressor lubricating oil inlet A3, evaporator inlet B1, evaporator outlet B2, evaporator heat exchange outlet B3, oil separator inlet C1, oil separator refrigerant outlet C2, oil separator mixture outlet C3. Detailed Embodiments
[0021] First of all, it should be noted that the following will illustrate the composition, working principle, characteristics, and advantages of the refrigeration system according to this application by way of examples. However, it should be understood that all the descriptions are only given for the purpose of illustration and should not be construed as any limitation to this application.
[0022] In addition, for any single technical feature described or implied in the embodiments mentioned in this article, or any single technical feature shown or implied in each drawing, this application still allows any combination or deletion to continue between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of this application that may not be directly mentioned in this article.
[0023] Figure 1 It is a schematic diagram of the principle of a refrigeration system provided in the prior art.
[0024] Such as Figure 1As shown, a refrigeration system 100 is provided, which includes a compressor 101, a condenser 102, an expansion valve 103, and an evaporator 104 connected in sequence.
[0025] In the refrigeration / heating cycle of the refrigeration system 100, first is the compression step. The compressor 101 sucks in the refrigerant gas in the evaporator 104 and compresses and boosts it to obtain a high-temperature and high-pressure refrigerant gas.
[0026] Then is the condensation step. The high-pressure and high-temperature refrigerant gas output by the compressor 101 exchanges heat in the condenser 102, raising the temperature of the cooling water in the condenser 102, and at the same time, the refrigerant gas is condensed into a refrigerant liquid.
[0027] Next is the expansion step. The relatively high-temperature and high-pressure refrigerant liquid in the condenser 102 flows through the expansion valve 103 for throttling expansion, reducing its pressure and temperature to form a low-temperature and low-pressure refrigerant liquid.
[0028] Finally is the evaporation step. The evaporator 104 absorbs heat from the heat exchange medium and evaporates the low-pressure and low-temperature refrigerant liquid into a gas, while reducing the temperature of the heat exchange medium in the evaporator 104. The refrigerant gas at the outlet of the evaporator 104 is sucked in by the compressor 101 again for compression, repeating the above cycle process of compression, condensation, throttling, and evaporation.
[0029] During the above evaporation process, the refrigerant liquid is evaporated into a gas and is sucked into the compressor 101 again. At this time, it is necessary to ensure that the suction temperature of the refrigerant is a little higher than the evaporation temperature, that is, the refrigerant should maintain a certain suction superheat to ensure that the refrigerant sucked into the compressor 101 can remain in a gaseous state and prevent liquid hammer phenomenon from affecting the normal operation of the compressor 101.
[0030] Furthermore, the compressor 101 in the above refrigeration system 100 is configured as a screw compressor. When the screw compressor works, lubricating oil needs to be sprayed between its screw and other components. The lubricating oil forms an oil film between the rotors, playing a role in sealing, lubricating, and cooling. Refer to Figure 1 , an oil separator 105 is arranged on the output side of the compressor 101 for separating the lubricating oil mixed in the refrigerant gas. The refrigerant gas separated in the oil separator 105 flows to the condenser 102, the expansion valve 103, and the evaporator 104 to continue the refrigeration cycle of the refrigeration system 100. The lubricating oil separated in the oil separator 105 returns to the compressor 101 for lubrication. Figure 1 In the figure, the solid line is the refrigerant flow path, and the dashed line is the oil and refrigerant mixture / lubricating oil flow path.
[0031] However, in the above-mentioned prior art solutions, the temperature of the lubricating oil separated in the oil separator 105 is relatively high. Since the viscosity of the lubricating oil decreases as the temperature rises, the lubricating oil with too low viscosity causes insufficient lubrication, and the friction between components such as the screw and bearings in the compressor 101 is aggravated, which is not conducive to the normal operation of the compressor 101.
[0032] According to the working principle of the above refrigeration system 100 and the problems faced in its refrigeration cycle, in the embodiments of the present application, a refrigeration system 200 is provided.
[0033] Figure 2 It is a schematic diagram of a refrigeration system provided in the embodiments of the present application.
[0034] Figure 3 It is a schematic diagram of a heat exchange system provided in the embodiments of the present application.
[0035] As Figure 2 shown, the refrigeration system 200 provided in this embodiment includes a heat exchange system 1. The compressor 201, the oil separator 205, and the evaporator 204 in the refrigeration system 200 belong to this heat exchange system 1.
[0036] The compressor 201 is provided with a suction port A1 and an outlet A2; the evaporator 204 is provided with an inlet B1 and an outlet B2; the oil separator 205 is provided with an inlet C1, a refrigerant outlet C2, and a mixture outlet C3.
[0037] The suction port A1 of the compressor 201 is communicated with the outlet B2 of the evaporator 204; the outlet A2 of the compressor 201 is connected to the inlet C1 of the oil separator 205. The inlet B1 of the evaporator 204 is indirectly communicated with the refrigerant outlet C2 of the oil separator 205, and the outlet B2 of the evaporator 204 is communicated with the suction port A1 of the compressor 101.
[0038] The inlet C1 of the oil separator 205 is communicated with the outlet A2 of the compressor 201, receives the high-temperature and high-pressure refrigerant gas mixed with lubricating oil discharged by the compressor 201 and separates it. The refrigerant outlet C2 of the oil separator 205 returns the separated refrigerant gas to the cycle of the refrigeration system 200, and it can flow through the condenser 202, the expansion valve 203, and the evaporator 204 in sequence. The mixture outlet C3 of the oil separator 205 is used to discharge the separated oil and refrigerant mixture.
[0039] As Figure 3 shown, in the embodiments of the present application, the heat exchange system 1 further includes a heat exchanger 2, an input pipeline 3, a first regulating device 4, and an output pipeline 5.
[0040] Refrigerant flows through the evaporator 204. The refrigerant flows into the evaporator 204 through the inlet B1 of the evaporator 204, and the refrigerant after absorbing heat flows out of the evaporator 204 through the outlet B2 of the evaporator 204 and flows into the inlet A1 of the compressor 101. The superheat of the refrigerant is the difference between the temperature when it flows into the suction port A1 of the compressor 101 and the evaporation temperature of the refrigerant.
[0041] The heat exchanger 2 is provided with a heat exchange pipeline (not shown) including a primary side pipeline (not shown) and a secondary side pipeline (not shown). The input pipeline 3 is respectively connected to the heat exchange outlet B3 of the evaporator 204 and the secondary side pipeline of the heat exchange pipeline, and part of the refrigerant in the evaporator 204 is introduced into the secondary side pipeline of the heat exchange pipeline of the heat exchanger 2. The first regulating device 4 is arranged on the input pipeline 3 and is used to lift the pressure of the refrigerant from the evaporator 204 and pump it into the secondary side pipeline of the heat exchange pipeline of the heat exchanger 2 for heat exchange. The output pipeline 5 is respectively connected to the suction port A1 of the compressor 201 (the outlet B2 of the evaporator 104) and the secondary side pipeline of the heat exchange pipeline of the heat exchanger 2, and returns the refrigerant heated and raised in temperature after heat exchange in the heat exchanger 2 to the compressor 201.
[0042] In this embodiment, the first regulating device 4 is configured as an air pump, preferably a low-pressure lift pump. In addition, in the actual application of this application, the first regulating device 4 can also be set as one or a combination of forms such as a gear pump, a centrifugal pump, a piston pump, a hydraulic plunger pump, a pneumatic diaphragm pump, a booster pump, a steam jet pump, etc., which is not limited here. As long as it can lift the pressure of part of the refrigerant gas at the outlet of the evaporator 204 to overcome the flow path resistance of the input pipeline 3, the heat exchanger 2 and the output pipeline 5, etc., and pump it into the heat exchanger 2 for heat exchange and can flow to the suction port A1 of the compressor 201.
[0043] At the suction port A1 of the compressor 201, part of the refrigerant heated and raised in temperature after heat exchange in the heat exchanger 2 is mixed with part of the refrigerant discharged from the outlet B2 of the evaporator 204, so that the temperature of the refrigerant when it flows into the suction port A1 of the compressor 201 increases, and thus the difference between the temperature of the refrigerant when it flows into the suction port A1 of the compressor 201 and the evaporation temperature of the refrigerant increases, that is, the superheat of the refrigerant increases, so as to prevent the refrigerant from entering the compressor 201 in a liquid state due to insufficient superheat and causing liquid hammer.
[0044] On the other hand, in the embodiment of the present application, the high-temperature and high-pressure oil and refrigerant mixture from the oil separator 205 flows through the mixture outlet C3 of the oil separator 205 to the heat exchanger 2. The oil and refrigerant mixture is lubricating oil containing a small amount of refrigerant gas. This lubricating oil flows through the primary side pipeline of the heat exchange pipeline in the heat exchanger 2, and the temperature of the lubricating oil in the oil separator 205 is higher than the temperature of the refrigerant at the outlet of the evaporator 204. Therefore, in the heat exchanger 2, the lubricating oil flowing through the primary side pipeline of the heat exchange pipeline in the heat exchanger 2 exchanges heat with the refrigerant flowing through the secondary side pipeline of the heat exchange pipeline in the heat exchanger 2, causing the temperature of the refrigerant to rise, while the originally high-temperature lubricating oil temperature drops, thereby increasing the viscosity of the lubricating oil. The high-viscosity lubricating oil then returns to the compressor 201 through the lubricating oil inlet A3 of the compressor 201 for lubrication during the compression stroke, thereby effectively improving the lubrication effect, reducing wear during the operation of the compressor 101, and extending the service life of the compressor 201.
[0045] In this embodiment, the heat exchanger 2 is preferably a plate heat exchanger. Between multiple plates in the plate heat exchanger, thin rectangular channels are formed, which respectively form the primary side pipeline and the secondary side pipeline. The high-temperature fluid flowing through the primary side pipeline and the low-temperature fluid flowing through the secondary side pipeline do not come into contact with each other, and heat exchange is carried out through the plates. The plate heat exchanger has the advantages of high heat exchange efficiency, compact structure, and small floor area.
[0046] Optionally, in the embodiment of the present application, the temperature difference between the refrigerant in the input pipeline 3 and the output pipeline 5 is in the range of 20 - 40 °C. If the temperature of the refrigerant at the outlet of the evaporator 204 is about 60 °C, after heat exchange through the heat exchanger 2, the temperature of the refrigerant in the output pipeline 5 can be increased to, for example, about 90 °C (80 °C - 100 °C). Further, the refrigerant in the output pipeline 5 (for example, 90 °C) is mixed with the refrigerant discharged from the outlet B2 of the evaporator 204 (for example, 60 °C) at the suction port A1 of the compressor 201, so that the temperature of the refrigerant entering the compressor 201 remains at least higher than 60 °C, for example, 61 °C - 62 °C. Thus, the temperature of the refrigerant entering the compressor 201 can be increased by 1 - 2 °C, that is, the suction superheat of the compressor 201 is increased by 1 - 2 °C, thereby ensuring that the refrigerant enters the compressor 201 in a gaseous state.
[0047] Of course, the 1 - 2 °C here is only an example and is not limited thereto. According to the adjustment of parameters such as the flow rate and temperature of the refrigerant in the input pipeline 3 and the temperature and flow rate of the oil and refrigerant mixture flowing through the heat exchanger 2, the suction superheat of the refrigerant can be appropriately adjusted.
[0048] In an embodiment of the present application, the temperature difference of the oil and refrigerant mixture before and after flowing through the heat exchange pipeline of the heat exchanger 2 is in the range of 20-50 °C. If the temperature of the lubricating oil when flowing out of the mixture outlet C3 of the oil separator 205 is 110 °C, after heat exchange through the heat exchanger 2, the temperature of the lubricating oil flowing into the compressor 101 can be reduced to about 85 °C (90 °C - 60 °C).
[0049] Optionally, in an embodiment of the present application, the heat exchange system 1 further includes a second regulating device 6. The second regulating device 6 is arranged on the output pipeline 5, and the second regulating device 6 can be used to regulate the flow rate of the refrigerant gas in the output pipeline 5. In other words, through the second regulating device 6, the flow rate ratio of the high-temperature refrigerant (such as 90 °C) after heat exchange through the heat exchanger 2 at the suction port A1 of the compressor 201 can be regulated. After mixing with the low-temperature refrigerant (such as 60 °C) discharged from the outlet B2 of the evaporator 204, by regulating the mixing ratio of the high-temperature refrigerant (such as 90 °C) after heat exchange through the heat exchanger 2 and the low-temperature refrigerant (such as 60 °C) directly from the outlet B2 of the evaporator 204, the temperature of the refrigerant entering the compressor 101 (at the suction port A1 of the compressor 101) can be regulated, that is, the superheat degree of the refrigerant entering the compressor 101 can be regulated.
[0050] Specifically, if the second regulating device 6 is adjusted to increase the gas flow rate in the output pipeline 5, the proportion of the high-temperature refrigerant (such as 90 °C) at the suction port A1 of the compressor 201 will increase, and the temperature of the refrigerant entering the compressor 201 will increase accordingly; conversely, if the second regulating device 6 is adjusted to decrease the gas flow rate in the output pipeline 5, the proportion of the high-temperature refrigerant (such as 90 °C) at the suction port A1 of the compressor 201 will decrease, and the temperature of the refrigerant entering the compressor 201 will decrease accordingly. Of course, when the second regulating device 6 is adjusted to decrease the gas flow rate in the output pipeline 5, if the temperature and flow rate parameters of the oil and refrigerant flowing through the heat exchanger 2 remain unchanged, the temperature of the refrigerant flowing out of the output pipeline 5 will be higher, such as higher than 90 °C. Such a small amount but higher-temperature refrigerant, after mixing with a part of the refrigerant flowing out of the outlet B2 of the evaporator 204, can still keep the temperature of the refrigerant entering the compressor 201 at an appropriate superheat degree.
[0051] In an embodiment of the present application, in the heat exchange system 1, the effects of increasing the temperature of the refrigerant entering the compressor 201 and decreasing the temperature of the lubricating oil entering the compressor 201 are simultaneously achieved. Thus, the goals of increasing the suction superheat of the compressor 201 and increasing the viscosity of the lubricating oil in the compressor 201 can be simultaneously achieved. Moreover, the above heat exchange system 1 utilizes the heat generated during the self-circulation process of the refrigeration system 200 for heat exchange, without the need to add additional heating / cooling equipment. The heat exchange system 1 has a low cost, a simple structure, and is convenient for miniaturization design, and can be applied to various different types of refrigeration systems 200.
[0052] In the practical application of the present application, the second regulating device 6 is set as a flow regulating valve, and specifically, it can be set as a capillary tube, a thermostatic expansion valve, an electronic expansion valve, etc., which is not limited herein.
[0053] Figure 4 It is a flowchart of a heat exchange method provided in an embodiment of the present application.
[0054] Reference Figure 4 In an embodiment of the present application, a heat exchange method is further provided, which is applied to the above heat exchange system 1. The heat exchange method includes: a heat exchange step S1, in which the refrigerant from the input pipeline 3 is pumped to the secondary pipeline of the heat exchange pipeline of the heat exchanger 2, and exchanges heat with the oil and refrigerant mixture flowing through the primary pipeline of the heat exchange pipeline of the heat exchanger 2; an exhaust step S2, in which the heat-exchanged refrigerant is discharged to the suction port A1 side of the compressor 201 via the output pipeline 5.
[0055] In an embodiment of the present application, through the above heat exchange method, the effects of increasing the temperature of the refrigerant entering the compressor 201 and decreasing the temperature of the lubricating oil entering the compressor 201 can be simultaneously achieved. Thus, the goals of increasing the suction superheat of the compressor 201 and increasing the viscosity of the lubricating oil in the compressor 201 can be simultaneously achieved. Moreover, the heat exchange method utilizes the heat generated during the self-circulation process of the refrigeration system 200 for heat exchange, and the implementation effect of the above heat exchange method is good and the implementation steps are simple and efficient.
[0056] Optionally, in an embodiment of the present application, the heat exchange method further includes an adjustment step, in which the refrigerant pressure and refrigerant flow rate in the input pipeline 3 and / or the output pipeline 5 are respectively adjusted through the first regulating device 4 provided in the input pipeline 3 and / or the second regulating device 6 provided in the output pipeline 5. In other words, through the first regulating device 4 and the second regulating device 6, the intake pressure and the outlet volume of the refrigerant in the heat exchanger 2 can be respectively adjusted, so as to adjust the heat exchange amount of the refrigerant in the heat exchanger 2 according to this, and further, the temperature of the refrigerant flowing out of the heat exchanger 2, that is, the temperature of the refrigerant in the output pipeline 5, can be adjusted to reach the expected temperature.
[0057] Specifically, adjust the first adjusting device 4 and the second adjusting device 6 to make the refrigerant flow rate in the input pipeline 3 smaller. Then, when the temperature and flow rate parameters of the oil and refrigerant flowing through the heat exchanger 2 remain unchanged, the temperature difference between the refrigerant in the output pipeline 5 and the refrigerant in the input pipeline 3 will increase, and thus the superheat will also increase accordingly. Conversely, adjust the first adjusting device 4 and the second adjusting device 6 to make the refrigerant flow rate in the input pipeline 3 larger. Then, when the temperature and flow rate parameters of the oil and refrigerant flowing through the heat exchanger 2 remain unchanged, the temperature difference between the refrigerant in the output pipeline 5 and the refrigerant in the input pipeline 3 will decrease, and thus the superheat will also decrease accordingly.
[0058] Optionally, in the embodiment of the present application, in the heat exchange method, the temperature of the refrigerant in the output pipeline 5 rises by 20 - 40 °C relative to the temperature of the refrigerant in the input pipeline 3.
[0059] Optionally, in the embodiment of the present application, in the heat exchange method, the temperature difference between the oil and refrigerant mixture before and after flowing through the heat exchange pipeline of the heat exchanger 2 is in the range of 20 - 50 °C.
[0060] So far, the technical solution of the present invention has been described with reference to the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to the above specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.
Claims
1. A heat exchange system, characterized in that, Comprising: a compressor, an evaporator through which a refrigerant flows, a heat exchanger in which a heat exchange pipeline is provided; an input pipeline respectively communicating with the evaporator and the heat exchange pipeline, a first regulating device provided on the input pipeline for pumping the refrigerant from the evaporator to the heat exchange pipeline, an output pipeline respectively communicating with the suction port of the compressor and the heat exchange pipeline.
2. The heat exchange system according to claim 1, wherein Further comprising a second regulating device provided on the output pipeline.
3. The heat exchange system according to claim 2, wherein The heat exchange pipeline comprises a primary side pipeline and a secondary side pipeline;. The heat exchange system further comprises an oil separator, and an oil and refrigerant mixture from the oil separator flows through the primary side pipeline; The refrigerant from the input pipeline flows through the secondary side pipeline.
4. The heat exchange system according to claim 3, wherein, The temperature difference of the refrigerant in the input pipeline and the output pipeline is in the range of 20 - 40 °C, and the temperature difference of the oil and refrigerant mixture before and after flowing through the heat exchange pipeline is in the range of 20 - 50 °C.
5. The heat exchange system according to claim 4, characterized in that, The first regulating device and / or the second regulating device is configured as an air pump or a flow regulating valve.
6. A heat exchange method, applied to the heat exchange system as described in claim 5, characterized in that, Comprising: a heat exchange step, in which the refrigerant from the input pipeline is pumped to the heat exchange pipeline to exchange heat with the oil and refrigerant mixture flowing through the heat exchange pipeline; an exhaust step, in which the heat-exchanged refrigerant is discharged to the suction port side of the compressor via the output pipeline.
7. The heat exchange method according to claim 6, wherein Further comprising a regulating step of respectively regulating the refrigerant pressure or the refrigerant flow rate in the input pipeline and / or the output pipeline by the first regulating device provided on the input pipeline and / or the second regulating device provided on the output pipeline.
8. The heat exchange method according to claim 7, wherein Relative to the temperature of the refrigerant in the input pipeline, the temperature of the refrigerant in the output pipeline rises by 20 - 40 °C.
9. The heat exchange method according to claim 7, wherein The temperature difference of the oil and refrigerant mixture before and after flowing through the heat exchange pipeline is in the range of 20 - 50 °C.