Heat exchange system, control method and device thereof, readable storage medium and refrigeration equipment

Abstract

This invention provides a heat exchange system and its control method and apparatus, a readable storage medium, and a refrigeration device. The heat exchange system includes: a compressor, which includes an exhaust end and an intake end; a first heat exchanger connected to the exhaust end; a second heat exchanger connected to the intake end; a separator disposed between the exhaust end and the first heat exchanger for separating refrigerant and lubricating oil, the separator including an oil outlet and an air outlet, the air outlet connected to the first heat exchanger and the oil outlet connected to the intake end; and a valve body disposed between the oil outlet and the intake end for closing the oil outlet when the compressor is on and opening the oil outlet when the compressor is off.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and more specifically, to a heat exchange system and its control method and apparatus, a readable storage medium, and refrigeration equipment. Background Technology

[0002] In related technologies, such as Figure 1 As shown, during the cooling process of the heat exchange system, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 1' exchanges heat with the external environment through the condenser 2', becoming a low-temperature, high-pressure liquid refrigerant. After passing through the dryer filter 5' to remove moisture, and then through the throttling and pressure-reducing effect of the throttling section 4', it becomes a low-temperature, low-pressure liquid refrigerant. It then evaporates and exchanges heat in the evaporator 3', becoming a low-temperature, low-pressure gaseous refrigerant before returning to the compressor 1'. During this process, because the lubricating oil used in the compressor is miscible with the commonly used refrigerant, some of the lubricating oil will enter the evaporator 3' and condenser 2' along with the refrigerant, forming an oil film on the inner walls of the evaporator 3' and condenser 2'. This reduces the heat exchange efficiency of the evaporator 3' and condenser 2', leading to increased power consumption in the refrigerator. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, a first aspect of the present invention provides a heat exchange system.

[0005] A second aspect of the present invention also provides a refrigeration device.

[0006] A third aspect of the present invention also provides a control method for a heat exchange system.

[0007] A fourth aspect of the present invention also provides a control device for a heat exchange system.

[0008] A fifth aspect of the present invention also provides a control device for a heat exchange system.

[0009] A sixth aspect of the present invention also provides a readable storage medium.

[0010] A seventh aspect of the present invention also provides a refrigeration device.

[0011] In view of the above, a first aspect of the present invention provides a heat exchange system comprising: a compressor, the compressor including an exhaust end and an intake end; a first heat exchanger connected to the exhaust end; a second heat exchanger connected to the intake end; a separator disposed between the exhaust end and the first heat exchanger for separating refrigerant and lubricating oil, the separator including an oil outlet and an air outlet, the air outlet connected to the first heat exchanger and the oil outlet connected to the intake end; and a valve body disposed between the oil outlet and the intake end for closing the oil outlet when the compressor is on and opening the oil outlet when the compressor is off.

[0012] The heat exchange system provided by this invention includes a compressor, a first heat exchanger, a second heat exchanger, a separator, and a valve body. The compressor includes an exhaust end and an intake end. The first heat exchanger is connected to the exhaust end, and the second heat exchanger is connected to the intake end. The separator is located between the exhaust end and the first heat exchanger and is used to separate refrigerant and lubricating oil. The valve body is located between the oil outlet and the intake end and is used to open or close the oil outlet. When the compressor is running, the oil outlet is closed, allowing the lubricating oil to be separated by the separator and stored within it. This ensures sufficient pressure difference in the heat exchange system when the compressor is running, thereby guaranteeing the reliability of the heat exchange system during operation. When the compressor is off, the oil outlet is opened, utilizing the pressure difference between the compressor's intake and exhaust ends to deliver the lubricating oil to the compressor, reducing the energy consumption of the heat exchange system. The heat exchange system proposed in this application can utilize the pressure difference between the two ends of the compressor to deliver lubricating oil, preventing lubricating oil from entering the first and second heat exchangers with the refrigerant and forming an oil film on the inner wall surface of the first and second heat exchangers. The heat exchange system proposed in this application improves the heat exchange efficiency of the first and second heat exchangers.

[0013] The heat exchange system provided by the present invention may also have the following additional technical features:

[0014] In some possible designs, the heat exchange system also includes a control unit connected to the valve body, which is used to close the valve body when the compressor is on and to open the valve body when the compressor is off.

[0015] In this design, the heat exchange system also includes a control unit connected to the valve body. When the compressor is on, the control unit can close the valve body to separate the lubricating oil through the separator and store it in the separator. This ensures that there is a sufficient pressure difference in the heat exchange system when the compressor is on, thereby ensuring the reliability of the heat exchange system during operation. When the compressor is off, the control unit opens the valve body and uses the pressure difference between the compressor's inlet and outlet ends to deliver the lubricating oil to the compressor, reducing the energy consumption of the heat exchange system.

[0016] In some possible designs, the separator includes an oil reservoir with a volume of V ml, the compressor's lubricating oil discharge rate is m ml / h, the compressor's continuous operating time is n hours, and the product of m and n is less than or equal to V.

[0017] In this design, the separator has an oil storage chamber. When the compressor is on, the separated lubricating oil is stored in the oil storage chamber. When the compressor is off, the lubricating oil in the oil storage chamber is transported to the compressor through the inlet. The volume of the oil storage chamber is V ml, the compressor's lubricating oil discharge rate is m ml / hour, and the compressor's continuous operating time is n hours. The product of m and n is the lubricating oil discharge rate when the compressor is on. Within n hours, the lubricating oil discharge rate is less than the volume of the oil storage chamber, thus preventing the lubricating oil from overflowing or flowing with the refrigerant to the first and second heat exchangers, which would reduce heat exchange efficiency.

[0018] In some possible designs, the heat exchange system may also include: a throttling element located between the first heat exchanger and the second heat exchanger; and a dryer located between the throttling element and the first heat exchanger.

[0019] In this design, the heat exchange system also includes a throttling device and a dryer. The throttling device is located between the first heat exchanger and the second heat exchanger, and the dryer is located between the throttling device and the first heat exchanger. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor exchanges heat with the external environment through the first heat exchanger and becomes a low-temperature and high-pressure liquid refrigerant. After the moisture in the refrigerant is removed by the dryer, the throttling and pressure reduction effect of the throttling device turns it into a low-temperature and low-pressure liquid refrigerant. It then evaporates and exchanges heat in the second heat exchanger and returns to the compressor after becoming a low-temperature and low-pressure gaseous refrigerant.

[0020] According to a second aspect of the present invention, a refrigeration device is also provided, comprising: a heat exchange system as described in any of the above-described technical solutions.

[0021] The refrigeration equipment provided in the second aspect of the present invention, because it includes the heat exchange system proposed in any of the above-mentioned technical solutions, has all the beneficial effects of the heat exchange system.

[0022] According to a third aspect of the present invention, a control method for a heat exchange system is also provided for a heat exchange system as proposed in any of the technical solutions of the first aspect above. The control method includes: acquiring the operating status of the compressor and opening or closing the valve body according to the operating status.

[0023] The control method for a heat exchange system provided in the third aspect of the present invention obtains the operating status of the compressor, and then opens or closes the valve body according to the operating status. When the valve body is closed, the lubricating oil is stored and collected through the separator. When the valve body is open, the lubricating oil is delivered to the compressor through the pressure difference between the compressor's inlet and outlet ends, thereby ensuring the reliability of the compressor's operation and reducing the energy consumption of the heat exchange system.

[0024] In some possible designs, the operating states include on and off. The steps for opening or closing the valve body according to the operating state specifically include: closing the valve body when the compressor is on; and opening the valve body when the compressor is off.

[0025] In this design, the operating states include on and off. The steps of opening or closing the valve body according to the compressor's operating state specifically include: when the compressor is on, closing the valve body to separate the lubricating oil through the separator and store the lubricating oil in the separator, ensuring sufficient pressure difference in the heat exchange system when the compressor is on, thereby ensuring the reliability of the heat exchange system operation; when the compressor is off, opening the valve body to use the pressure difference between the compressor's inlet and outlet ends to deliver the lubricating oil to the compressor, reducing the energy consumption of the heat exchange system.

[0026] In some possible designs, after the step of opening the valve body, the following steps are also included: obtaining the compressor's shutdown duration; and closing the valve body based on the shutdown duration being greater than or equal to a duration threshold, wherein the shutdown duration when the compressor is off is greater than the duration threshold.

[0027] In this design, after opening the valve body, a timer is started after the compressor stops running to obtain the compressor's shutdown duration. If the compressor's shutdown duration is greater than or equal to a time threshold, it indicates that the lubricating oil has been completely delivered, at which point the valve body is closed, completing the lubricating oil delivery. The fact that the compressor's shutdown duration is greater than the time threshold ensures that the lubricating oil can be completely delivered back to the compressor during the shutdown period.

[0028] According to a fourth aspect of the invention, a control device for a heat exchange system is also provided for a heat exchange system as described in any of the first aspects, the control device comprising: an acquisition unit for acquiring the operating status of a compressor; and a control unit for opening or closing a valve body according to the operating status.

[0029] The control device for the heat exchange system provided in the fourth aspect of the present invention includes an acquisition unit and a control unit. The acquisition unit is used to acquire the operating status of the compressor, and the control unit is used to open or close the valve body according to the operating status. When the valve body is closed, the lubricating oil is stored and collected by the separator. When the valve body is open, the lubricating oil is delivered to the compressor by the pressure difference between the inlet and outlet ends of the compressor, thereby ensuring the operating reliability of the compressor and reducing the energy consumption of the heat exchange system.

[0030] According to a fifth aspect of the present invention, a control device for a heat exchange system is provided, comprising: a memory having a program or instructions stored thereon; and a processor, which, when executing the program or instructions stored in the memory, implements the steps of the control method for the heat exchange system as described in any of the third aspects.

[0031] The control device for the heat exchange system provided by the present invention can realize the control method of the heat exchange system of any of the above-mentioned technical solutions, and therefore has all the beneficial technical effects of the control method of the heat exchange system of any of the above-mentioned technical solutions.

[0032] According to a sixth aspect of the present invention, a readable storage medium is provided, which stores a program or instructions, which, when processed, implement the control method of the heat exchange system defined in any of the above-described technical solutions.

[0033] The readable storage medium provided by the present invention can realize the control method of the heat exchange system of any of the technical solutions in the third aspect, and therefore has all the beneficial technical effects of the control method of the heat exchange system of any of the above technical solutions.

[0034] According to a seventh aspect of the present invention, a refrigeration apparatus is provided, comprising: a control device for a heat exchange system as proposed in the fourth or fifth aspect; and / or a readable storage medium as proposed in the sixth aspect.

[0035] The refrigeration equipment provided by the present invention can realize the control device of the heat exchange system of any of the technical solutions in the fourth or fifth aspects, and / or the readable storage medium proposed in the sixth aspect, and therefore has all the beneficial technical effects of the control device and / or readable storage medium of the heat exchange system of any of the above technical solutions.

[0036] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Figure 1 A schematic diagram of the heat exchange system of the related technology is shown.

[0039] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0040] 1' Compressor, 2' Condenser, 3' Evaporator, 4' Throttling section, 5' Dryer filter.

[0041] Figure 2 A schematic diagram of the structure of a heat exchange system according to an embodiment of the present invention is shown;

[0042] Figure 3 Another structural schematic diagram of a heat exchange system according to an embodiment of the present invention is shown;

[0043] Figure 4A schematic flowchart of a control method for a heat exchange system according to an embodiment of the present invention is shown.

[0044] Figure 5 Another schematic flowchart of a control method for a heat exchange system according to an embodiment of the present invention is shown;

[0045] Figure 6 A schematic block diagram of the control device of a heat exchange system according to an embodiment of the present invention is shown.

[0046] in, Figures 2 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0047] 1 Compressor, 10 Discharge end, 12 Inlet end, 2 First heat exchanger, 3 Second heat exchanger, 4 Separator, 40 Air outlet, 42 Oil outlet, 5 Valve body, 6 Throttling element, 7 Dryer, 8 Control unit, 500 Control device for heat exchange system, 502 Acquisition unit, 504 Control unit. Detailed Implementation

[0048] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0049] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0050] The following reference Figures 2 to 6 This invention describes a heat exchange system and its control method and apparatus, a readable storage medium, and a refrigeration device according to some embodiments of the present invention.

[0051] like Figure 2 As shown, according to a first embodiment of the present invention, the present invention proposes a heat exchange system, comprising: a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a separator 4, and a valve body 5.

[0052] Specifically, compressor 1 includes an exhaust end 10 and an intake end 12. A first heat exchanger 2 is connected to the exhaust end 10. A second heat exchanger 3 is connected to the intake end 12. A separator 4 is located between the exhaust end 10 and the first heat exchanger 2, used to separate refrigerant and lubricating oil. The separator 4 includes an oil outlet 42 and an exhaust outlet 40, with the exhaust outlet 40 connected to the first heat exchanger 2 and the oil outlet 42 connected to the intake end 12.

[0053] The valve body 5 is located between the oil outlet 42 and the air inlet 12. The valve body can close the oil outlet 42 when the compressor 1 is turned on and open the oil outlet 42 when the compressor 1 is turned off.

[0054] The heat exchange system provided by the present invention includes a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a separator 4, and a valve body 5. The compressor 1 includes an exhaust end 10 and an inlet end 12. The first heat exchanger 2 is connected to the exhaust end 10, the second heat exchanger 3 is connected to the inlet end 12, and the separator 4 is disposed between the exhaust end 10 and the first heat exchanger 2 for separating refrigerant and lubricating oil.

[0055] The valve body 5 is located between the oil outlet 42 and the inlet 12, and is used to open or close the oil outlet 42. When the compressor 1 is on, the oil outlet 42 can be closed, allowing the lubricating oil to be separated by the separator 4 and stored within the separator 4. This ensures sufficient pressure difference in the heat exchange system when the compressor 1 is on, thereby guaranteeing the reliability of the heat exchange system operation. When the compressor 1 is off, the valve body 5 can open the oil outlet 42, utilizing the pressure difference between the inlet 12 and the outlet 10 of the compressor 1 to deliver lubricating oil into the compressor 1, reducing the energy consumption of the heat exchange system.

[0056] The heat exchange system proposed in this application can utilize the pressure difference across the compressor 1 to deliver lubricating oil, preventing lubricating oil from entering the first heat exchanger 2 and the second heat exchanger 3 along with the refrigerant, and forming an oil film on the inner wall surface of the first heat exchanger 2 and the second heat exchanger 3. The heat exchange system proposed in this application improves the heat exchange efficiency of the first heat exchanger 2 and the second heat exchanger 3.

[0057] It should be noted that during the refrigeration process of the heat exchange system, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 exchanges heat with the external environment through the first heat exchanger 2 and becomes a low-temperature and high-pressure liquid refrigerant. After the moisture in the refrigerant is removed by the dryer filter, it becomes a low-temperature and low-pressure liquid refrigerant after passing through the throttling and pressure reduction effect of the capillary tube. It then evaporates and exchanges heat in the second heat exchanger 3 and returns to the compressor 1 after becoming a low-temperature and low-pressure gaseous refrigerant.

[0058] Specifically, the first heat exchanger 2 is a condenser, and the second heat exchanger 3 is an evaporator. The refrigerant includes R600a (isobutane) and R134a (tetrafluoroethane).

[0059] like Figure 3 As shown, according to a second embodiment of the present invention, based on the above embodiments, the heat exchange system further includes a control unit 8.

[0060] The control unit 8 is connected to the valve body 5. The control unit 8 is used to close the valve body 5 when the compressor 1 is turned on and to open the valve body 5 when the compressor 1 is turned off.

[0061] In this design, the heat exchange system also includes a control unit 8, which is connected to the valve body 5. When the compressor 1 is on, the control unit 8 can close the valve body 5 to separate the lubricating oil through the separator 4 and store it within the separator 4. This ensures sufficient pressure difference in the heat exchange system when the compressor 1 is on, thereby guaranteeing the reliability of the heat exchange system operation. When the compressor 1 is off, the valve body 5 is opened, and the pressure difference between the inlet end 12 and the outlet end 10 of the compressor 1 is used to deliver the lubricating oil to the compressor 1, reducing the energy consumption of the heat exchange system.

[0062] According to a third embodiment of the present invention, based on any of the above embodiments, the separator 4 further includes an oil storage chamber with a volume of V ml, the lubricating oil discharge rate of the compressor 1 is m ml / hour, the continuous operating time of the compressor 1 is n hours, and the product of m and n is less than or equal to V.

[0063] In this design, the separator 4 has an oil storage chamber. When the compressor 1 is on, the separated lubricating oil is stored in the oil storage chamber. When the compressor 1 is off, the lubricating oil in the oil storage chamber is transported to the compressor 1 through the air inlet 12. The volume of the oil storage chamber is V ml, the discharge rate of the lubricating oil from the compressor 1 is m ml / hour, and the continuous operating time of the compressor 1 is n hours. The product of m and n is the lubricating oil discharge rate when the compressor 1 is on. During the n hours, the discharge rate of the lubricating oil is less than the volume of the oil storage chamber, thus preventing the lubricating oil from overflowing or flowing with the refrigerant to the first heat exchanger 2 and the second heat exchanger 3, which would reduce the heat exchange efficiency.

[0064] In practical applications, m should be less than or equal to 10 ml / hour. V and n can be set according to the actual situation.

[0065] It is understandable that compressor 1 operates intermittently, turning on and off intermittently. For example, the second heat exchanger 3 is used to cool the refrigeration chamber. When the temperature inside the refrigeration chamber is greater than or equal to the first temperature threshold, compressor 1 turns on and cools the refrigeration chamber through the circulation of refrigerant. When the temperature inside the refrigeration chamber is less than or equal to the second temperature threshold, compressor 1 turns off to reduce the energy consumption of the heat exchange system. The first temperature threshold is greater than the second temperature threshold, and its specific value is set according to the actual situation.

[0066] In some possible designs, the heat exchange system also includes: a throttling element 6 and a dryer 7.

[0067] The throttling element 6 is located between the first heat exchanger 2 and the second heat exchanger 3; the dryer 7 is located between the throttling element 6 and the first heat exchanger 2.

[0068] In this design, the heat exchange system also includes a throttling element 6 and a dryer 7. The throttling element 6 is located between the first heat exchanger 2 and the second heat exchanger 3, and the dryer 7 is located between the throttling element 6 and the first heat exchanger 2. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 exchanges heat with the external environment through the first heat exchanger 2 and becomes a low-temperature and high-pressure liquid refrigerant. After the moisture in the refrigerant is removed by the dryer 7, it becomes a low-temperature and low-pressure liquid refrigerant after the throttling and pressure reduction effect of the throttling element 6. It then evaporates and exchanges heat in the second heat exchanger 3 and returns to the compressor 1 after becoming a low-temperature and low-pressure gaseous refrigerant.

[0069] Specifically, the throttling element 6 includes a capillary tube.

[0070] In specific applications, such as Figure 2 As shown, a separator 4 is connected between the compressor 1 and the first heat exchanger 2. The separator 4 is an oil separator used to separate the lubricating oil in the refrigerant. The outlet 40 of the separator 4 is connected to the first heat exchanger 2, and the oil outlet 42 of the separator 4 is connected to the return pipe or process pipe or the compressor housing of the compressor 1 through the valve body 5, so that the valve body 5 is connected to the inlet end 12. The separated lubricating oil is introduced into the compressor 1 by utilizing the pressure difference between the inlet end 12 and the outlet end 10 of the compressor 1.

[0071] According to a fourth embodiment of the present invention, a refrigeration device is also provided, comprising: a heat exchange system as described in any of the above embodiments.

[0072] The refrigeration device provided in the fourth embodiment of the present invention, since it includes the heat exchange system proposed in any of the above embodiments, has all the beneficial effects of the heat exchange system.

[0073] Specifically, the refrigeration equipment is a refrigerator. The first heat exchanger 2 is a condenser, the second heat exchanger 3 is an evaporator, and the refrigeration equipment includes a refrigeration chamber, with the evaporator used to cool the refrigeration chamber.

[0074] According to a fifth embodiment of the present invention, a control method for a heat exchange system is also proposed for a heat exchange system as described in any of the above embodiments.

[0075] like Figure 4 The diagram shows a flowchart of a control method for a heat exchange system according to an embodiment of this application. The control method includes:

[0076] Step 302: Obtain the operating status of the compressor;

[0077] Step 304: Open or close the valve body according to the operating status.

[0078] The control method for the heat exchange system provided by the present invention opens or closes the valve body according to the operating status of the compressor. When the valve body is closed, the lubricating oil is stored and collected by the separator. When the valve body is open, the lubricating oil is delivered to the compressor through the pressure difference between the inlet and outlet ends of the compressor, thereby ensuring the operational reliability of the compressor and reducing the energy consumption of the heat exchange system.

[0079] In some possible designs, the compressor's operating states include on and off, and step 304 specifically includes: closing the valve body when the compressor is on.

[0080] Open the valve body with the compressor off.

[0081] In this design, the compressor's operating states include on and off. The steps for opening or closing the valve body according to the compressor's operating state specifically include: When the compressor is on, the valve body is closed to separate the lubricating oil through the separator and store it within the separator. This ensures sufficient pressure difference in the heat exchange system when the compressor is on, thereby guaranteeing the reliability of the heat exchange system's operation. When the compressor is off, the valve body is opened to connect the oil storage chamber with the compressor's oil return chamber. This allows the pressure difference between the compressor's inlet and outlet ends to deliver the lubricating oil to the compressor, reducing the energy consumption of the heat exchange system.

[0082] According to the sixth embodiment of the present invention, based on the fifth embodiment described above, after the step of opening the valve body, the method further includes: obtaining the compressor's shutdown duration.

[0083] The valve body is closed if the closing time is greater than or equal to the time threshold.

[0084] Among them, the downtime when the compressor is off exceeds the duration threshold.

[0085] In this design, after opening the valve body, a timer is started after the compressor stops running to obtain the compressor's shutdown duration. If the compressor's shutdown duration is greater than or equal to a time threshold, it indicates that the lubricating oil has been completely delivered, at which point the valve body is closed, completing the lubricating oil delivery. The fact that the compressor's shutdown duration is greater than the time threshold ensures that the lubricating oil can be completely delivered back to the compressor during the shutdown period.

[0086] It should be noted that the shutdown duration and duration threshold are set according to the actual situation. It can be understood that the compressor operates intermittently. The compressor shuts down after running continuously for n hours and restarts after the compressor shuts down for a certain duration. Specifically, the shutdown duration of the compressor is determined by starting the timer after the compressor stops running. The duration threshold is the time required for V milliliters of lubricating oil to be discharged from the separator to the compressor.

[0087] Further, the volume of the oil storage cavity is V milliliters, the discharge amount of the lubricating oil of the compressor is m milliliters per hour, the continuous operation duration of the compressor is n hours, and the product of m and n is the discharge amount of the lubricating oil when the compressor is turned on. The discharge amount of the lubricating oil within n hours is less than the volume of the oil storage cavity, thereby avoiding the lubricating oil from overflowing or flowing to the first heat exchanger and the second heat exchanger along with the refrigerant, which would reduce the heat exchange efficiency.

[0088] Among them, m is less than or equal to 10 milliliters per hour. V and n can be set according to the actual situation.

[0089] In a specific application, assume that the discharge amount of the lubricating oil in the heat exchange system is: m milliliters per hour (currently, for most compressors of refrigeration equipment, the value of m is: m ≤ 10 milliliters per hour), the longest continuous operation time of the compressor is: n hours, then the maximum discharge amount of the lubricating oil in one cycle of the compressor operation is: m × n milliliters. Let the volume of the oil storage cavity of the separator be V milliliters, then V > m × n.

[0090] According to the seventh embodiment of the present invention, as Figure 5 shown, a flowchart of a control method for a heat exchange system according to an embodiment of the present application is shown. The control method includes:

[0091] Step 402: Determine whether the compressor is turned on. If so, enter step 410; if not, enter step 404:

[0092] Step 404: Open the valve body;

[0093] Step 406: Time the shutdown duration of the compressor;

[0094] Step 408: Determine whether the shutdown duration is greater than the duration threshold. If so, enter step 410; if not, return to step 408;

[0095] Step 410: Control the valve body to close.

[0096] When the refrigeration equipment requests refrigeration and the compressor is running, the valve body is closed, and the lubricating oil is mixed with the refrigerant and discharged from the compressor. After passing through the separator, the lubricating oil is separated and stored in the oil storage cavity of the separator, and the refrigerant continues to be discharged to the first heat exchanger; when the refrigeration equipment reaches the shutdown point and the compressor stops running, the valve body is opened, and using the pressure difference between the intake end and the exhaust end of the compressor, the separated lubricating oil is introduced into the compressor.

[0097] Start timing tmin from when the compressor stops running. Assume that the time required for V ml of lubricating oil to be discharged from the separator to the compressor is T1, and the shortest shutdown duration of the compressor is T2, then T1 < T2. Then when t > T1, the valve body is closed.

[0098] This invention adds a separator to the exhaust end of the compressor. When the compressor is running, the mixture of refrigerant and lubricating oil discharged from the compressor passes through the separator, and the lubricating oil is separated and stored in the oil storage chamber of the separator. When the compressor stops, the pressure difference between the compressor's inlet and outlet ends is used to guide the lubricating oil stored in the oil storage chamber of the separator into the compressor, thereby preventing the lubricating oil from entering the first heat exchanger and the second heat exchanger, improving the heat exchange efficiency of the first heat exchanger and the second heat exchanger, and achieving the purpose of energy saving.

[0099] like Figure 6 As shown, according to an eighth embodiment of the present invention, a control device 500 for a heat exchange system is also provided for the heat exchange system proposed in any of the above claims, the control device including an acquisition unit 502 and a control unit 504.

[0100] Specifically, the acquisition unit 502 is used to acquire the operating status of the compressor, and the control unit 504 is used to open or close the valve body according to the operating status.

[0101] The control device 500 for the heat exchange system provided by the present invention includes an acquisition unit 502 and a control unit 504. The acquisition unit 502 is used to acquire the operating status of the compressor, and the control unit 504 is used to open or close the valve body according to the operating status. When the valve body is closed, the lubricating oil is stored and collected by the separator. When the valve body is open, the lubricating oil is delivered to the compressor through the pressure difference between the inlet and outlet ends of the compressor, thereby ensuring the reliability of the compressor operation and reducing the energy consumption of the heat exchange system.

[0102] In some possible designs, the operating states include on and off. The control unit 504 opens or closes the valve body according to the operating state, specifically including: closing the valve body when the compressor is on; and opening the valve body when the compressor is off.

[0103] In this design, the operating states include on and off. The steps for opening or closing the valve body according to the compressor's operating state specifically include: when the compressor is on, the valve body is closed to separate the lubricating oil through the separator and store it within the separator. This ensures sufficient pressure difference in the heat exchange system when the compressor is on, thereby guaranteeing the reliability of the heat exchange system. When the compressor is off, the valve body is opened, utilizing the pressure difference between the compressor's inlet and outlet ends to deliver the lubricating oil to the compressor, reducing the energy consumption of the heat exchange system.

[0104] In some possible designs, after the valve body opening step, the acquisition unit 502 is also used to: acquire the compressor's shutdown duration.

[0105] Control unit 504 is also used to: close the valve body when the closing duration is greater than or equal to the duration threshold.

[0106] Among them, the downtime when the compressor is off exceeds the duration threshold.

[0107] In this design, after opening the valve body, a timer is started after the compressor stops running to obtain the compressor's shutdown duration. If the compressor's shutdown duration is greater than or equal to a time threshold, it indicates that the lubricating oil has been completely delivered, at which point the valve body is closed, completing the lubricating oil delivery. The fact that the compressor's shutdown duration is greater than the time threshold ensures that the lubricating oil can be completely delivered back to the compressor during the shutdown period.

[0108] It should be noted that the shutdown duration and duration threshold are set according to the actual situation. It can be understood that the compressor operates intermittently. The compressor shuts down after running continuously for n hours and restarts after the compressor shuts down for a certain duration. Specifically, the shutdown duration of the compressor is determined by starting the timer after the compressor stops running. The duration threshold is the time required for V milliliters of lubricating oil to be discharged from the separator to the compressor.

[0109] Furthermore, the volume of the oil storage chamber is V ml, the discharge rate of the compressor's lubricating oil is m ml / hour, and the continuous operating time of the compressor is n hours. The product of m and n is the lubricating oil discharge rate when the compressor is running. Within n hours, the discharge rate of the lubricating oil is less than the volume of the oil storage chamber, thereby preventing the lubricating oil from overflowing or flowing with the refrigerant to the first and second heat exchangers and reducing the heat exchange efficiency.

[0110] In practical applications, m should be less than or equal to 10 ml / hour. V and n can be set according to the actual situation.

[0111] According to a ninth embodiment of the present invention, a control device for a heat exchange system is provided, comprising: a memory storing a program or instructions thereon; and a processor, which, when executing the program or instructions stored in the memory, implements the steps of the control method for the heat exchange system as described in any of the above embodiments.

[0112] The control device for the heat exchange system provided by the present invention can realize the control method of the heat exchange system in any of the above embodiments, and therefore has all the beneficial technical effects of the control method of the heat exchange system in any of the above embodiments.

[0113] According to a tenth embodiment of the present invention, a readable storage medium is provided, which stores a program or instructions, which, when processed, implement the control method of the heat exchange system defined in any of the above embodiments.

[0114] The readable storage medium provided by the present invention can implement the control method of the heat exchange system of any of the above embodiments, and therefore has all the beneficial technical effects of the control method of the heat exchange system of any of the above embodiments.

[0115] According to an eleventh embodiment of the present invention, a refrigeration device is provided, comprising: a control device for a heat exchange system as described in the above embodiments; and / or a readable storage medium as described in the above embodiments.

[0116] The refrigeration equipment provided by the present invention can realize the control device of the heat exchange system of any of the above embodiments, and / or the readable storage medium proposed in the above embodiments, and therefore has all the beneficial technical effects of the control device and / or readable storage medium of the heat exchange system of any of the above embodiments.

[0117] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installed," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "linked" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0118] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0119] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat exchange system, characterized in that, include: The compressor includes an exhaust end and an intake end; The first heat exchanger is connected to the exhaust end; The second heat exchanger is connected to the air inlet end; A separator is provided between the exhaust end and the first heat exchanger for separating refrigerant and lubricating oil. The separator includes an oil outlet and an air outlet. The air outlet is connected to the first heat exchanger, and the oil outlet is connected to the air inlet. A valve body is located between the oil outlet and the air inlet, and is used to close the oil outlet when the compressor is turned on and to open the oil outlet when the compressor is turned off. The lubricating oil is delivered into the compressor by the pressure difference between the inlet and outlet ends of the compressor; The separator includes an oil storage chamber. When the compressor is turned on, the separated lubricating oil is stored in the oil storage chamber. When the compressor is turned off, the lubricating oil in the oil storage chamber is transported to the compressor through the air inlet.

2. The heat exchange system according to claim 1, characterized in that, Also includes: A control unit, connected to the valve body, is used to close the valve body when the compressor is turned on and to open the valve body when the compressor is turned off.

3. The heat exchange system according to claim 1, characterized in that, The volume of the oil storage chamber is V ml, the lubricating oil discharge rate of the compressor is m ml / hour, the continuous operating time of the compressor is n hours, and the product of m and n is less than or equal to V.

4. The heat exchange system according to any one of claims 1 to 3, characterized in that, Also includes: A throttling element is disposed between the first heat exchanger and the second heat exchanger; A dryer is disposed between the throttling element and the first heat exchanger.

5. A refrigeration device, characterized in that, include: The heat exchange system as described in any one of claims 1 to 4.

6. A control method for a heat exchange system, used in any one of claims 1 to 4, characterized in that, The control method includes: The operating status of the compressor is obtained, and the valve body is opened or closed according to the operating status; The operating state includes open and closed, and the step of opening or closing the valve body according to the operating state specifically includes: Based on the compressor being shut down, the valve body is opened; After the step of opening the valve body, the method further includes: Obtain the compressor's shutdown duration; The valve body is closed based on the closure duration being greater than or equal to a duration threshold. Wherein, the downtime when the compressor is turned off is greater than the duration threshold.

7. The control method for the heat exchange system according to claim 6, characterized in that, The step of opening or closing the valve body according to the operating state further includes: The valve body is closed when the compressor is turned on.

8. A control device for a heat exchange system, used in any one of claims 1 to 4, characterized in that, The control device includes: An acquisition unit is used to acquire the operating status of the compressor; The control unit is used to open or close the valve body according to the operating status; The operating state includes open and closed. The steps of the control unit to open or close the valve body according to the operating state specifically include: Based on the compressor being shut down, the valve body is opened; After the step of opening the valve body, the acquisition unit is further configured to: acquire the shutdown duration of the compressor; The control unit is further configured to: close the valve body based on the closing duration being greater than or equal to a duration threshold. Wherein, the downtime when the compressor is turned off is greater than the duration threshold.

9. A control device for a heat exchange system, characterized in that, include: A memory that stores programs or instructions; When the processor executes the program or instructions stored in the memory, it implements the steps of the control method for the heat exchange system as described in claim 6 or 7.

10. A readable storage medium having a program or instructions stored thereon, characterized in that, When the program or instructions are executed by the processor, the control method of the heat exchange system as described in claim 6 or 7 is performed.

11. A refrigeration device, characterized in that, include: Control device for the heat exchange system as described in claim 8 or 9; and / or The readable storage medium as described in claim 10.

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