Oil separator and air conditioning system
By setting up a partition plate and heating device in the oil separator, combined with a temperature detection and control system, the problem that the traditional oil separator heating device cannot heat the lubricant oil quickly is solved, and the normal lubrication of the compressor and energy consumption are achieved.
Patent Information
- Application Number
- CN202421912620.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-07
AI Technical Summary
The heating devices of existing conventional oil separators cannot heat the lubricant in the oil separator to the target temperature in a short time, resulting in too low oil return temperature, resulting in poor lubrication of the compressor or liquid hit. If the specifications of the heating device are increased, the unit energy consumption will increase, which is not conducive to energy saving.
An oil separator is designed, and a partition plate is provided to separate the accommodating chamber into a separation zone and a heating zone, equipped with a heating device, a first temperature detection device and a second temperature detection device, and the opening and closing of the heating device are controlled according to the temperature threshold to ensure that the lubricating oil is heated to the target temperature in a short time.
By monitoring the temperature of the separation zone and heating zone, the heating device is accurately controlled to prevent poor lubrication or liquid impact caused by too low oil return temperature of the compressor. At the same time, there is no need to set up a heating device with excessive power, so as to achieve accurate oil temperature control with less power consumption and save energy consumption.
Smart Images
Figure CN222951272U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of refrigeration technology, and in particular to an oil separator and an air conditioning system. Background Art
[0002] At present, most air-conditioning systems need to be equipped with an oil separator, which can separate the lubricating oil in the refrigerant gas discharged by the compressor to prevent a large amount of lubricating oil from being discharged into the connecting pipes and indoor heat exchangers, so as to ensure the oil supply effect of the compressor.
[0003] As the capacity of air conditioners continues to increase, the air conditioning pipelines become longer and longer, and the operating ambient temperature range becomes wider and wider, traditional oil separators can no longer meet actual usage requirements. The more refrigerant and lubricating oil there are in the air conditioning system, the larger the capacity of the oil separator. Traditional oil separator heating devices can no longer heat the lubricating oil in the oil separator to the target temperature in a short period of time. The lower oil temperature will cause the return oil temperature to be too low, resulting in poor lubrication or liquid hammer in the compressor. At this time, if the specifications of the heating device are increased, the energy consumption of the unit will increase, which is not conducive to energy saving. Utility Model Content
[0004] The present application provides an oil separator and an air conditioning system to solve the technical problem that the heating device of the existing conventional oil separator cannot heat the lubricating oil in the oil separator to the target temperature in a short time, and the low oil temperature will cause the return oil temperature to be too low, resulting in poor lubrication or liquid hammer of the compressor. At this time, if the specifications of the heating device are increased, it will lead to an increase in the energy consumption of the unit, which is not conducive to energy saving.
[0005] In the first aspect, the present application provides an oil separator, which is arranged on an air-conditioning system, the air-conditioning system includes a compressor connected to the oil separator, and the oil separator includes: a main body, which is provided with a accommodating chamber; a partition plate, which is arranged in the accommodating chamber of the main body, and the partition plate divides the accommodating chamber into a separation zone and a heating zone; a heating device, which is arranged in the heating zone; a first temperature detection device, which is used to obtain a first temperature of the separation zone; and a second temperature detection device, which is used to obtain a second temperature of the heating zone; if the first temperature and / or the second temperature is less than a first temperature threshold, the heating device is controlled to turn on; if the first temperature and / or the second temperature is greater than the second temperature threshold, the heating device is controlled to turn off; wherein the first temperature threshold is less than the second temperature threshold.
[0006] In a possible implementation, a third temperature detection device is also included, and the third temperature detection device is used to obtain the ambient temperature; if the ambient temperature is less than or equal to the third temperature threshold and the second temperature is less than the fourth temperature threshold, the heating device is controlled to turn on, until the second temperature is greater than the fifth temperature threshold, the heating device is controlled to turn off, the third temperature threshold is less than the first temperature threshold, the fourth temperature threshold is greater than the second temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold.
[0007] In a possible implementation, a branch pipe is further included, a first end of the branch pipe is connected to the separation zone, a second end of the branch pipe is connected to the heating zone, and a first control valve is arranged on the branch pipe.
[0008] In a possible implementation, the heating device is an electric heating belt, and the electric heating belt is arranged around the heating area.
[0009] In a possible implementation, an oil return pipe is further included, wherein a first end of the oil return pipe is connected to the heating area, and a second end of the oil return pipe is connected to the oil return port of the compressor.
[0010] In a possible implementation, it also includes an air intake pipe, a first end of the air intake pipe is connected to the separation zone, and a second end of the air intake pipe is connected to the exhaust port of the compressor.
[0011] In a possible implementation, an exhaust pipe is further included, one end of which is connected to the separation zone so that the separated high-pressure refrigerant gas can be discharged through the exhaust pipe.
[0012] In a possible implementation manner, the first end of the air inlet pipe is arranged toward the outer wall of the exhaust pipe.
[0013] In a second aspect, the present application also provides an air conditioning system, comprising: a compressor; and the oil separator as described above, the oil separator being connected to the compressor.
[0014] In the third aspect, the present application also provides a control method for an air-conditioning system, which is applied to the above air-conditioning system, and the control method includes: obtaining the operating condition of the air-conditioning system, the first temperature of the separation zone of the air-conditioning system, and the second temperature of the heating zone; when the operating condition is a cooling standby mode, if the first temperature and / or the second temperature is less than a first temperature threshold, the heating device is controlled to turn on; if the first temperature or the second temperature is greater than the second temperature threshold, the heating device is controlled to turn off; wherein the first temperature threshold is less than the second temperature threshold.
[0015] In a possible implementation, the method further includes: if the operating condition is a cooling operation mode, controlling the heating device to be turned off.
[0016] In a possible implementation, it also includes: obtaining the ambient temperature; when the operating condition is a heating standby mode, if the ambient temperature is less than or equal to a third temperature threshold, and the second temperature is less than a fourth temperature threshold, controlling the heating device to turn on; until the second temperature is greater than a fifth temperature threshold, controlling the heating device to turn off; wherein the third temperature threshold is less than the first temperature threshold, the fourth temperature threshold is greater than the second temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold.
[0017] In a possible implementation, it also includes: when the operating condition is a heating standby mode, if the ambient temperature is greater than the third temperature threshold, the first temperature is less than the sixth temperature threshold and the second temperature is less than the seventh temperature threshold, the heating device is controlled to turn on, otherwise, the heating device is controlled to turn off; wherein the sixth temperature threshold is greater than the second temperature threshold and less than the seventh temperature threshold, and the seventh temperature threshold is less than the fourth temperature threshold.
[0018] In a possible implementation, the air conditioning system further includes a branch pipe, a first end of the branch pipe is connected to the separation zone, a second end of the branch pipe is connected to the heating zone, and a first control valve is provided on the branch pipe. The control method further includes: if the operating condition is a heating operation mode, obtaining an operating frequency F of the compressor; if F≤F m1 , control the first control valve to open for a first time and then close, and then open the first control valve again after a second time interval; if F m1 <F≤F m2 , control the first control valve to be closed after opening for the first time, and then open the first control valve again after a third time interval; if F>F m2 , control the first control valve to be opened for a first time and then closed, and then the first control valve is opened again after a fourth time interval; wherein, F m1 is the first frequency threshold, F m2 is the first frequency threshold, F m1 <F m2 , the second duration is longer than the third duration, and the third duration is longer than the fourth duration.
[0019] In a possible implementation, the method further includes: if the operating condition is a cooling oil return mode, controlling the heating device to be turned off; if the operating condition is a heating oil return mode or a defrosting mode, controlling the heating device to be turned on.
[0020] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:
[0021] The embodiment of the present application provides an oil separator and an air conditioning system. In the oil separator, at the beginning, a small amount of refrigeration lubricating oil is stored in the heating zone. The small amount of lubricating oil in the heating zone can be quickly heated by a small-sized heating device, shortening the heating time of the lubricating oil, thereby quickly providing high-temperature lubricating oil to the compressor, avoiding the compressor return oil temperature being too low to cause poor lubrication or liquid hammer of the compressor, and ensuring the normal startup and operation of the compressor. By monitoring the first temperature of the separation zone and the second temperature of the heating zone, if the air conditioning system is in the refrigeration standby mode, since the external ambient temperature is generally high, the lubricating oil temperature in the heating zone will generally not be too low, and will not cause poor lubrication or liquid hammer of the compressor. If T 1 <T m1 or T 2 <T m1, indicating that the air conditioner may be in standby state for a long time, and the ambient temperature is not high. If the oil temperature is too low, it is easy to cause poor lubrication or liquid hammer of the compressor. At this time, it is necessary to turn on the heating device to heat the lubricating oil in the heating area, so as to avoid providing the compressor with lubricating oil at a lower temperature, ensure the normal start and operation of the compressor, and ensure the reliability of the compressor operation. If the heating device is already in the on state, then maintain the corresponding on state; if T 1 >T m1 or T 2 >T m1 , control the heating device to turn off to save energy. If the heating device is already in the off state, then maintain the corresponding off state. Compared with the prior art, there is no need to set a heating device with too high power, and the oil return at the precise oil temperature is achieved with less power consumption, avoiding the compressor return oil temperature being too low to cause poor lubrication or liquid hammer of the compressor, and saving energy at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0024] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.
[0025] Figure 1 A schematic diagram of the structure of an oil separator provided in an embodiment of the present application;
[0026] Figure 2 A schematic diagram of the structure of an air conditioning system provided in an embodiment of the present application.
[0027] Description of reference numerals:
[0028] 100. Air conditioning system;
[0029] 1. Oil separator; 11. Main body; 111. Accommodating chamber; 111a. Separation zone; 111b. Heating zone; 12. Partition plate; 13. Heating device; 14. Branch pipe; 141. First control valve; 15. Oil return pipe; 16. Air intake pipe; 17. Exhaust pipe; 101. First temperature detection device; 102. Second temperature detection device; 103. Third temperature detection device;
[0030] 2. Compressor; 3. Gas-liquid separator; 4. Subcooler; 5. Outdoor heat exchanger; 6. First pipeline; 7. Electronic expansion valve; 8. Second pipeline; 9. Second control valve. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0032] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.
[0033] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.
[0034] In the prior art, as the capacity of air conditioners continues to increase, the air conditioner pipelines become longer and longer, and the operating ambient temperature range becomes wider and wider, the traditional oil separator can no longer meet the actual use requirements. The more refrigerant and lubricating oil there are in the air conditioning system, the larger the capacity of the oil separator. The traditional oil separator heating device can no longer heat the lubricating oil in the oil separator to the target temperature in a short time. The lower oil temperature will increase the viscosity of the lubricating oil, resulting in too low return oil temperature, causing poor lubrication or liquid hammer of the compressor. At this time, if the specifications of the heating device are increased, it will lead to an increase in the energy consumption of the unit, which is not conducive to energy saving.
[0035] In order to solve the technical problem that in the prior art the lubricating oil in the oil separator cannot be heated to the target temperature in a short time, the lower oil temperature will lead to the return oil temperature being too low, causing poor lubrication or liquid hammer of the compressor. At this time, if the specifications of the heating device are increased, it will lead to increased energy consumption of the unit, which is not conducive to energy saving. The present application provides an oil separator and an air-conditioning system, which can realize oil return at a precise oil temperature with less power consumption, avoid poor lubrication or liquid hammer of the compressor caused by too low return oil temperature of the compressor, and save energy at the same time.
[0036] Figure 1 An oil separator 1 provided in an embodiment of the present application is arranged on an air conditioning system 100. The air conditioning system 100 includes a compressor 2 ( Figure 2 ), the oil separator 1 includes a body 11, a partition plate 12, a heating device 13, a first temperature detection device 101 and a second temperature detection device 102. The body 11 is provided with a housing chamber 111; the partition plate 12 is arranged in the housing chamber 111 of the body 11, and the partition plate 12 divides the housing chamber 111 into a separation zone 111a and a heating zone 111b; the heating device 13 is arranged in the heating zone 111b, and is used to heat the lubricating oil in the heating zone 111b; the first temperature detection device 101 is used to obtain a first temperature T of the separation zone 111a 1 The second temperature detection device 102 is used to obtain the second temperature T of the heating zone 111b 2 ; If the first temperature and / or the second temperature is less than the first temperature threshold T m1 , control the heating device 13 to turn on; if the first temperature and / or the second temperature is greater than the second temperature threshold T m2 When the first temperature threshold is less than the second temperature threshold, the heating device 13 is controlled to be turned off.
[0037] The oil-gas mixture discharged from the compressor 2 enters the separation zone 111a, and the oil-gas mixture is sprayed onto the inner wall of the body 11. The oil in the oil-gas mixture is condensed and liquefied when it encounters the inner wall of the body 11 due to its own weight and large particle size, and its own high temperature. Then it slides down along the inner wall of the body 11 to form lubricating oil and gathers on the partition plate 12, while the high-pressure refrigerant gas is discharged from the oil separator 1. At the beginning, the heating zone 111b stores a small amount of refrigeration lubricating oil. The small amount of lubricating oil in the heating zone 111b can be quickly heated by the small-sized heating device 13, shortening the heating time of the lubricating oil, thereby quickly providing high-temperature lubricating oil to the compressor 2, avoiding the compressor 2 return oil temperature being too low to cause poor lubrication or liquid hammer of the compressor 2, and ensuring the normal startup and operation of the compressor 2. By monitoring the first temperature of the separation zone 111a and the second temperature of the heating zone 111b, if the air-conditioning system 100 is in the cooling standby mode, due to the generally high external ambient temperature, the lubricating oil temperature in the heating zone 111b is generally not too low, and will not cause poor lubrication or liquid hammer of the compressor 2. If T 1 <T m1 or T 2 <T m1 , indicating that the air conditioner may be in a long-term standby state, and the ambient temperature is not high. If the oil temperature is too low, it is easy to cause poor lubrication or liquid hammer of the compressor 2. At this time, it is necessary to turn on the heating device 13 to heat the lubricating oil in the heating area 111b, so as to avoid providing the compressor 2 with a lower temperature lubricating oil, ensure the normal start and operation of the compressor 2, and ensure the reliability of the operation of the compressor 2. If the heating device 13 is already in the on state, then it is sufficient to maintain the corresponding on state; if T 1 >T m1 or T 2 >T m1 , control the heating device 13 to turn off to save energy. If the heating device 13 is already in the off state, then maintain the corresponding off state. Compared with the prior art, there is no need to set a heating device 13 with too high power, and the oil return at the precise oil temperature is achieved with less power consumption, so as to avoid the compressor 2 from having poor lubrication or liquid hammer caused by the compressor 2 returning oil temperature being too low, and save energy at the same time.
[0038] When the compressor 2 is started, the air conditioning system 100 is in a cooling operation mode, and the lubricating oil circulates continuously and can maintain a certain temperature by itself. At this time, no additional heating is required, and the heating device 13 can be controlled to be in an off state.
[0039] Optionally, the heating device 13 may adopt a heater in the prior art, and the heating of the lubricating oil in the heating area 111b is achieved by controlling the opening and closing of the heater. The specific structure and working principle of the heater can refer to the prior art and will not be described in detail here.
[0040] Specifically, the first temperature detection device 101 and the second temperature detection device 102 can adopt temperature sensors in the prior art. The first temperature detection device 101 can be arranged on the inner wall of the separation zone 111a of the main body 11, and the first temperature detection device 101 is arranged close to the partition plate 12 to improve the accuracy of detecting the oil temperature in the separation zone; the second temperature detection device 102 can be arranged on the inner wall of the heating zone 111b of the main body 11, and the second temperature detection device 102 is arranged away from the partition plate 12 to improve the accuracy of detecting the oil temperature in the heating zone.
[0041] Optionally, T m1 Can be set to 0℃, T m2 It can be set to 5℃, and the specific parameters can be adjusted and set according to the actual use environment.
[0042] Since the oil separator 1 also needs to work under some harsh working conditions, such as extreme low temperature weather, due to the high viscosity of the refrigerant and lubricating oil at low temperatures, it takes a long time for the refrigerant to circulate and establish sufficient exhaust superheat. The lower the temperature, the greater the risk of liquid hammer faced by the compressor, which is likely to cause wear of the compressor 2. Therefore, the present application sets a third temperature detection device 103 for obtaining the ambient temperature, so that the oil separator 1 can provide a higher temperature lubricating oil to the compressor 2 to ensure the normal operation of the compressor 2. The specific design is described as follows.
[0043] In some embodiments, a third temperature detection device 103 ( Figure 2 The third temperature detection device 103 is used to obtain the ambient temperature T s ; If the ambient temperature is less than or equal to the third temperature threshold T m3 And the second temperature is less than the fourth temperature threshold T m4 , the heating device 13 is controlled to be turned on; until the second temperature is greater than the fifth temperature threshold T m5 When the air conditioning system 100 is in the heating standby mode, the ambient temperature needs to be monitored. If T s ≤T m3 The low temperature environment outside can easily make the lubricating oil temperature in the heating area 111b of the oil separator 1 low. In order to ensure the normal start of the compressor 2, the temperature of the lubricating oil in the heating area 111b of the oil separator 1 is low. 2 <T m4 The heating device 13 is turned on at the same time, and the heating device 13 is used to quickly heat up the small amount of lubricating oil in the heating area 111b until it reaches T m5 The heating device 13 is turned off at this time. At this time, a small amount of high-temperature lubricating oil in the heating area 111b can be used to ensure the normal start of the compressor 2. When the oil temperature reaches a higher temperature, it is turned off, thereby saving energy consumption.
[0044] Optionally, T m3 Can be set to -10℃, T m4 Can be set to 45℃, T m5 It can be set to 50℃, and the specific parameters can be adjusted and set according to the actual use environment. When the ambient temperature is less than -10℃, it is ultra-low temperature heating. A part of the lubricating oil in the heating area 111b of the oil separator 1 must be heated to the target temperature, and the high-temperature lubricating oil can be supplied immediately after the compressor 2 is turned on, which can ensure the safe operation of the compressor 2 and speed up the refrigerant circulation speed.
[0045] Specifically, the third temperature detection device 103 may be disposed on the outdoor heat exchanger 5 of the air-conditioning system 100 .
[0046] Furthermore, if the refrigeration system is in the heating operation mode, after the compressor 2 has been started normally, T 2 When the temperature is less than 45℃, turn on the heating device 13, T 2 When the temperature is higher than 50°C, the heating device 13 is turned off to keep the lubricating oil temperature in the heating area 111b between 45°C and 50°C, thereby ensuring the normal operation of the compressor 2.
[0047] In some embodiments, Figure 1 As shown, the branch pipe 14 is also included, the first end of the branch pipe 14 is connected to the separation zone 111a, the second end of the branch pipe 14 is connected to the heating zone 111b, and the branch pipe 14 is provided with a first control valve 141. Optionally, the first control valve 141 is configured as a solenoid valve. When the first control valve 141 is opened, the lubricating oil in the separation zone 111a can flow into the heating zone 111b through the branch pipe 14, so that the oil and liquid between the separation zone 111a and the heating zone 111b are connected.
[0048] Under the working condition of the refrigeration standby mode, the ambient temperature is generally high in the refrigeration mode, the refrigerant temperature is high, and no additional heating is required. The heating device 13 is turned off. Since the lubricating oil in the heating area 111b needs to be added to the compressor 2, the first control valve 141 is kept open at this time to achieve compensation of the lubricating oil in the heating area 111b; in order to ensure reliability, once the oil temperature in the heating area 111b is too low, the heating device 13 is turned on to avoid the oil temperature being too low and causing liquid hammer in the compressor 2. At this time, the first control valve 141 is kept open. Under the working condition of the refrigeration operation mode, because the ambient temperature is relatively high (compared with the ambient temperature in the heating mode), the refrigerant and lubricating oil can be quickly circulated through the work of the compressor 2, without additional heating, the heating device 13 is turned off, and the first control valve 141 is kept open at this time.
[0049] In the heating standby mode, the first control valve 141 remains closed to prevent the lubricating oil from freezing due to extreme low temperature weather and causing blockage in the branch pipe 14, thereby affecting the subsequent normal operation of the refrigeration system.
[0050] In the heating operation mode, the heating device 13 is turned on and off according to the second temperature, and the first control valve 141 is turned on and off according to the operating frequency of the compressor 2. m1 , control the first control valve 141 to be opened for a first time t1 and then closed, and then the first control valve 141 is opened again after a second time t2; if F m1 <F≤F m2 , control the first control valve 141 to be closed after opening for a first time, and then to be opened again after a third time t3; if F>F m2 , control the first control valve 141 to be closed after opening for a first time, and then to be opened again after a fourth time t4; wherein, F m1 is the first frequency threshold, F m2 is the first frequency threshold, F m1 <Fm2, the second duration is greater than the third duration, and the third duration is greater than the fourth duration.
[0051] Optionally, F m1 Can be set to 30Hz, F m2 It can be set to 60Hz, t1 can be set to 30s, t2 can be set to 15min, t3 can be set to 10min, and t4 can be set to 5min. For specific control parameters, see Table 1 below.
[0052] Table 1. Control parameters of the first control valve
[0053] F Opening time Action interval F≤30Hz, low frequency 30s 15min 30<F≤60Hz, medium frequency 30s 10min 60Hz<F, high frequency 30s 5min
[0054] It is understandable that the higher the operating frequency of the compressor 2, the more lubricating oil it consumes, so the first control valve 141 needs to be opened more frequently to compensate for the lubricating oil. By intermittently opening the first control valve 141, the normal operation of the compressor 2 is guaranteed, while saving energy consumption.
[0055] In some embodiments, the heating device 13 includes an electric heating belt, which is arranged around the heating area 111b. By surrounding the heating area 111b with the electric heating belt, the uniformity of the oil temperature rise in the heating area 111b can be improved, thereby shortening the heating time and saving energy consumption.
[0056] In some embodiments, an oil return pipe 15 is further included, a first end of the oil return pipe 15 is communicated with the heating area 111b, and a second end of the oil return pipe 15 is communicated with the oil return port of the compressor 2. A small amount of lubricating oil is stored in the heating area 111b, and the heating device 13 can shorten the heating time of the lubricating oil. The high-temperature lubricating oil can be transported to the compressor 2 through the oil return pipe 15, thereby ensuring the normal startup and operation of the compressor 2.
[0057] In some embodiments, an air intake pipe 16 is further included, a first end of the air intake pipe 16 is communicated with the separation zone 111a, and a second end of the air intake pipe 16 is communicated with the exhaust port of the compressor 2. The oil-gas mixture discharged from the exhaust port of the compressor 2 enters the separation zone 111a through the air intake pipe 16, and the work of the compressor 2 can realize continuous circulation of the lubricating oil, so that the lubricating oil in the separation zone 111a maintains a certain temperature, and no additional heating is required at this time.
[0058] In some embodiments, an exhaust pipe 17 is further included, one end of which is connected to the separation area 111a, so that the separated high-pressure refrigerant gas is discharged through the exhaust pipe 17 and continues to circulate in the air-conditioning system 100 pipeline.
[0059] Optionally, the first end of the intake pipe 16 faces the outer wall of the exhaust pipe 17, so that the oil-gas mixture of the compressor 2 can exchange heat with the separated high-pressure refrigerant gas. At the same time, the oil-gas mixture of the compressor 2 contacts the exhaust pipe 17 to be condensed and liquefied, and then slides down along the exhaust pipe 17 to form lubricating oil and gathers on the partition plate 12.
[0060] Figure 2 An air conditioning system 100 provided in the present application includes a compressor 2 and the oil separator 1 as described above, wherein the oil separator 1 is connected to the compressor 2 .
[0061] At the beginning, a small amount of refrigerated lubricating oil is stored in the heating area 111b. The small-sized heating device 13 can quickly heat the small amount of lubricating oil in the heating area 111b, shortening the heating time of the lubricating oil, thereby quickly providing high-temperature lubricating oil to the compressor 2, avoiding the compressor 2 return oil temperature being too low to cause poor lubrication or liquid hammer of the compressor 2, ensuring the normal startup and operation of the compressor 2, and saving energy consumption at the same time.
[0062] The air-conditioning system 100 also includes a gas-liquid separator 3, a subcooler 4, and an outdoor heat exchanger 5. The refrigerant outlet of the gas-liquid separator 3 is connected to the refrigerant inlet of the compressor 2, the refrigerant inlet of the gas-liquid separator 3 is connected to the refrigerant outlet of the subcooler 4, the refrigerant inlet of the subcooler 4 is connected to the refrigerant outlet of the outdoor heat exchanger 5 through a first pipeline 6, an electronic expansion valve 7 is provided on the first pipeline 6, the exhaust pipe 17 of the oil separator 1 is connected to the refrigerant inlet of the outdoor heat exchanger 5 through a second pipeline 8 at one end away from the accommodating chamber 111, and a second control valve 9 is provided on the second pipeline 8. The second control valve 9 is a four-way valve. The refrigerant new exchange path is switched by the four-way valve to realize the switching of various working conditions. The specific working principle and control process can refer to the existing technology and will not be repeated here.
[0063] The present application provides a control method of an air conditioning system 100, which is applied to the air conditioning system 100 as described above. The control method comprises the following steps:
[0064] S1, obtaining the working condition of the air conditioning system 100, the first temperature of the separation zone 111a of the air conditioning system 100, and the second temperature of the heating zone 111b;
[0065] S2. When the operating condition is the cooling standby mode, if the first temperature and / or the second temperature is lower than the first temperature threshold, the heating device 13 is controlled to be turned on; if the first temperature and / or the second temperature is higher than the second temperature threshold, the heating device 13 is controlled to be turned off; wherein the first temperature threshold is lower than the second temperature threshold.
[0066] In the refrigeration standby mode, the ambient temperature is generally high in the refrigeration mode, the refrigerant temperature is high, and no additional heating is required. The heating device 13 is turned off. Since the lubricating oil in the heating area 111b needs to be supplemented to the compressor 2, the first control valve 141 is kept open at this time to achieve the compensation of the lubricating oil in the heating area 111b. In order to ensure reliability, once the oil temperature in the heating area 111b is too low, for example, T 1 <T m2 (e.g. 5°C) 0°C or T 2 <0℃, the heating device 13 is turned on to raise the temperature of the lubricating oil in the heating area 111b to T m2 (e.g. 5°C) to avoid liquid hammer in the compressor 2 caused by too low oil temperature. At this time, the first control valve 141 is normally open.
[0067] In some embodiments, if the operating condition is the cooling operation mode, the heating device 13 is controlled to be turned off. Because the ambient temperature is relatively high (compared to the ambient temperature in the heating mode), after the compressor is normally started, the refrigerant and lubricating oil can be quickly circulated through the work of the compressor 2, and no additional heating is required, and the heating device 13 can be kept in the off state.
[0068] In some embodiments, the control method further comprises the following steps:
[0069] Get the ambient temperature;
[0070] When the working condition is the heating standby mode, if the ambient temperature is less than or equal to the third temperature threshold, and the second temperature is less than the fourth temperature threshold, the heating device 13 is controlled to turn on;
[0071] When the second temperature is greater than the fifth temperature threshold, the heating device 13 is controlled to be turned off; wherein the third temperature threshold is less than the first temperature threshold, the fourth temperature threshold is greater than the second temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold.
[0072] Optionally, T m3 Can be set to -10℃, T m4 Can be set to 45℃, T m5 It can be set to 50℃, and the specific parameters can be adjusted and set according to the actual use environment. It can be understood that when the ambient temperature is less than -10℃, it is ultra-low temperature heating, and a part of the lubricating oil in the heating area 111b of the oil separator 1 must be heated to the target temperature, so that the high-temperature lubricating oil can be supplied immediately after the compressor 2 is turned on, which can ensure the safe operation of the compressor 2 and speed up the refrigerant circulation speed.
[0073] In some embodiments, if the refrigeration system is in the heating operation mode, after the compressor 2 has been started normally, T 2 When the temperature is less than 45℃, turn on the heating device 13, T 2 When the temperature is higher than 50°C, the heating device 13 is turned off to keep the lubricating oil temperature in the heating area 111b between 45°C and 50°C, thereby ensuring the normal operation of the compressor 2.
[0074] In some embodiments, the control method further comprises the following steps:
[0075] In the case where the working condition is the heating standby mode, if the ambient temperature is greater than the third temperature threshold and the first temperature is less than the sixth temperature threshold T m6 The second temperature is less than the seventh temperature threshold T m7 , control the heating device 13 to turn on, otherwise, control the heating device 13 to turn off, the sixth temperature threshold is greater than the second temperature threshold and less than the seventh temperature threshold, and the seventh temperature threshold is less than the fourth temperature threshold.
[0076] Optionally, T m6 Can be set to 10℃, T m7 Can be set to 20℃, when T s >-10℃, and T 1 <10℃、T 2When the temperature is less than 20°C, it is determined that the standby time is too long, so the heating device 13 is controlled to be turned on, until the lubricating oil in the heating area 111b is heated to 20°C, and then the heating device 13 is controlled to be turned off, thereby saving energy consumption.
[0077] In some embodiments, the air conditioning system 100 further includes a branch pipe 14, a first end of the branch pipe 14 is connected to the separation area 111a, a second end of the branch pipe 14 is connected to the heating area 111b, and a first control valve 141 is provided on the branch pipe 14. The control method further includes:
[0078] If the operating condition is the heating operation mode, the operating frequency F of the compressor 2 is obtained;
[0079] If F≤F m1 , control the first control valve 141 to be closed after opening for a first time period, and then to open the first control valve 141 again after a second time period;
[0080] If F m1 <F≤F m2 , control the first control valve 141 to be closed after being opened for a first time period, and then to be opened again after a third time period;
[0081] If F>F m2 , controlling the first control valve 141 to be closed after being opened for a first time period, and opening the first control valve 141 again after a fourth time period;
[0082] Among them, F m1 is the first frequency threshold, F m2 is the first frequency threshold, F m1 <F m2 , the second duration is longer than the third duration, and the third duration is longer than the fourth duration.
[0083] The higher the operating frequency of the compressor 2, the more lubricating oil it consumes, so the first control valve 141 needs to be opened more frequently to compensate for the lubricating oil. By intermittently opening the first control valve 141, the normal operation of the compressor 2 is guaranteed, while saving energy consumption.
[0084] In some embodiments, the following steps are also included:
[0085] When the working condition is the refrigeration oil return mode, the heating device 13 is controlled to be closed, and the refrigerant and lubricating oil are quickly circulated through the work of the compressor 2 without additional heating, and the first control valve 141 is kept normally open;
[0086] When the working condition is the heating oil return mode or the defrosting mode, the heating device 13 is controlled to open so that the small amount of oil in the heating area 111b can be quickly heated up to ensure the reliability of the operation of the compressor 2, and the first control valve 141 is kept normally open.
[0087] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.
[0088] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.
[0089] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. An oil separator, arranged on an air conditioning system (100), the air conditioning system (100) comprising a compressor (2) connected to the oil separator (1), characterized in that: The oil separator (1) comprises: The body (11) is provided with a receiving cavity (111); a partition plate (12) disposed in the accommodating cavity (111) of the body (11), the partition plate (12) dividing the accommodating cavity (111) into a separation zone (111a) and a heating zone (111b); A heating device (13) is arranged in the heating area (111b); A first temperature detection device (101) for acquiring a first temperature of the separation zone (111a); and A second temperature detection device (102) for acquiring a second temperature of the heating area (111b); If the first temperature and / or the second temperature is less than a first temperature threshold, the heating device (13) is controlled to be turned on; if the first temperature and / or the second temperature is greater than a second temperature threshold, the heating device (13) is controlled to be turned off; wherein the first temperature threshold is less than the second temperature threshold.
2. The oil separator according to claim 1, characterized in that: It also includes a third temperature detection device (103), wherein the third temperature detection device (103) is used to obtain the ambient temperature; If the ambient temperature is less than or equal to a third temperature threshold and the second temperature is less than a fourth temperature threshold, the heating device (13) is controlled to be turned on; until the second temperature is greater than a fifth temperature threshold, the heating device (13) is controlled to be turned off; wherein the third temperature threshold is less than the first temperature threshold, the fourth temperature threshold is greater than the second temperature threshold, and the fifth temperature threshold is greater than the fourth temperature threshold.
3. The oil separator according to claim 1 or 2, characterized in that: It also includes a branch pipe (14), the first end of the branch pipe (14) is connected to the separation zone (111a), the second end of the branch pipe (14) is connected to the heating zone (111b), and the branch pipe (14) is provided with a first control valve (141).
4. The oil separator according to claim 1, characterized in that: The heating device (13) comprises an electric heating belt, and the electric heating belt is arranged around the heating area (111b).
5. The oil separator according to claim 1, characterized in that: It also includes an oil return pipe (15), a first end of the oil return pipe (15) being in communication with the heating area (111b), and a second end of the oil return pipe (15) being in communication with an oil return port of the compressor (2).
6. The oil separator according to claim 1, characterized in that: It also includes an air intake pipe (16), a first end of the air intake pipe (16) being in communication with the separation zone (111a), and a second end of the air intake pipe (16) being in communication with an exhaust port of the compressor (2).
7. The oil separator according to claim 6, characterized in that: It also includes an exhaust pipe (17), one end of which is connected to the separation zone (111a) so that the separated high-pressure refrigerant gas can be discharged through the exhaust pipe (17).
8. The oil separator according to claim 7, characterized in that: The first end of the air inlet pipe (16) is arranged toward the outer wall of the exhaust pipe (17).
9. An air conditioning system, characterized in that: include: Compressor (2); as well as The oil separator (1) according to any one of claims 1 to 8, wherein the oil separator (1) is connected to the compressor (2).