Air conditioning system

Abstract

The utility model relates to the technical field of refrigerating systems, in particular to an air conditioning system. The air conditioning system comprises an oil separator, an oil cooler, a compressor, an evaporator, a chilled water supply pipeline, a chilled water return pipeline, a first pipeline and a first control valve. An oil separator oil outlet of the oil separator is connected to an oil cooler oil inlet of the oil cooler, and an oil cooler oil outlet of the oil cooler is connected to a compressor air suction port of the compressor; an evaporator secondary refrigerant inlet of the evaporator is connected to a chilled water return pipeline, and an evaporator secondary refrigerant outlet of the evaporator is connected to a chilled water supply pipeline; one end of the first pipeline is connected to a chilled water return pipeline or a chilled water supply pipeline, and the other end of the first pipeline is connected to an oil cooler secondary refrigerant inlet of the oil cooler; the first control valve is arranged on the first pipeline. The air-conditioning system can ensure that the temperature at the air suction port of the compressor is relatively stable.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, in particular to an air-conditioning system. Background Art

[0002] Air conditioning systems enable certain places to obtain air with a certain temperature, humidity and air quality to meet the requirements of users and production processes and improve labor hygiene and indoor climate conditions. Therefore, they are widely used. Oil separators are installed in air conditioning systems to ensure reliable operation. The oil separators ensure smooth oil supply and effective lubrication of the compressor. The lubricating oil returned from the oil separator to the compressor suction port has a certain temperature, which increases the harmful superheat of the compressor suction port and reduces the cooling capacity of the air conditioning system.

[0003] Currently, the return oil of the oil separator can be cooled by additionally providing a cooling mechanism, but this has the disadvantage of a complex structure. Utility Model Content

[0004] In view of this, the utility model proposes an air conditioning system, aiming to partially or completely solve the technical problem that the existing air conditioning system is additionally provided with a cooling mechanism to cool the return oil of the oil separator, which has a complex structure.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] In a first aspect, an embodiment of the utility model provides an air-conditioning system, which includes an oil separator, an oil cooler, a compressor, an evaporator, a chilled water supply pipeline, a chilled water return pipeline, a first pipeline and a first control valve; the oil separator oil outlet of the oil separator is connected to the oil cooler oil inlet of the oil cooler, and the oil cooler oil outlet of the oil cooler is connected to the compressor suction port of the compressor; the evaporator refrigerant inlet of the evaporator is connected to the chilled water return pipeline, and the evaporator refrigerant outlet of the evaporator is connected to the chilled water supply pipeline; one end of the first pipeline is connected to the chilled water return pipeline or the chilled water supply pipeline, and the other end of the first pipeline is connected to the oil cooler refrigerant inlet of the oil cooler; the first control valve is arranged on the first pipeline.

[0007] Optionally, the air-conditioning system also includes a first temperature detection unit and a controller, the first temperature detection unit being connected to the oil outlet of the oil cooler; the controller being connected to the first temperature detection unit and the first control valve respectively, and the controller being used to adjust the opening of the first control valve according to the oil outlet temperature of the oil cooler outlet detected by the first temperature detection unit.

[0008] Optionally, the air conditioning system also includes a second pipeline and a flow regulating unit; the oil outlet of the oil separator and the oil inlet of the oil cooler are connected through the second pipeline; the flow regulating unit is connected to the second pipeline, and the flow regulating unit is used to regulate the flow in the second pipeline.

[0009] Optionally, the flow regulating unit is at least one of a capillary tube and a second control valve.

[0010] Optionally, the air-conditioning system also includes a third pipeline, a heat dissipation unit, a third control valve and an intelligent power module; one end of the third pipeline is connected to the chilled water return pipeline or the chilled water supply pipeline, and the other end of the third pipeline is connected to the heat dissipation unit refrigerant inlet of the heat dissipation unit; the third control valve is arranged on the third pipeline; the heat dissipation unit is connected to the intelligent power module for dissipating the heat of the intelligent power module.

[0011] Optionally, the air-conditioning system also includes a second temperature detection unit, which is connected to the refrigerant outlet of the heat dissipation unit; the controller is respectively connected to the second temperature detection unit and the third control valve, and the controller is used to adjust the opening of the third control valve according to the refrigerant temperature of the heat dissipation unit refrigerant outlet detected by the second temperature detection unit.

[0012] Optionally, the oil cooler refrigerant outlet of the oil cooler is connected to the refrigerant inlet of the heat dissipation unit.

[0013] Optionally, the air-conditioning system also includes a variable frequency water pump, which is connected to the third pipeline, and the variable frequency water pump water inlet of the variable frequency water pump is respectively connected to the third control valve outlet of the third control valve and the oil cooler refrigerant outlet of the oil cooler; the controller is connected to the variable frequency water pump, and the controller is used to adjust the operating frequency of the variable frequency water pump according to the oil outlet temperature of the oil cooler detected by the first temperature detection unit, the refrigerant temperature of the refrigerant outlet of the heat dissipation unit detected by the second temperature detection unit, the opening of the first control valve and the opening of the third control valve.

[0014] Optionally, the oil cooler is one of a shell and tube heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger; or, the evaporator is one of a shell and tube heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger.

[0015] Optionally, the first control valve is a stepless regulating valve; and / or the third control valve is a stepless regulating valve.

[0016] The utility model discloses an air conditioning system, wherein the oil cooler obtains the refrigerant flowing to the evaporator through the first pipeline and the chilled water return pipeline, or the oil cooler obtains the refrigerant flowing out of the evaporator through the first pipeline and the chilled water supply pipeline, and the oil cooler uses the refrigerant entering the oil cooler to cool the lubricating oil, and the lubricating oil with reduced temperature enters the compressor suction port, thereby solving the problem of harmful overheating of the compressor suction port caused by excessive lubricating oil temperature. Moreover, the refrigerant is obtained from the chilled water return pipeline or the chilled water supply pipeline as a cold source for the oil cooler, and the relevant devices and pipelines can be integrated into the whole unit of the air conditioning system, which is convenient for installation and use in engineering. The air conditioning system can adjust the flow of the refrigerant by controlling the opening of the first control valve, so that the temperature of the lubricating oil flowing out of the oil cooler is relatively constant, and the cooling effect of the refrigerant on the lubricating oil is stable, thereby ensuring that the temperature at the compressor suction port is relatively stable.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0019] Figure 1 A schematic diagram of an air conditioning system according to an embodiment of the utility model;

[0020] Figure 2 This is a control flow chart of the first control valve, the third control valve, and the variable frequency water pump of the air-conditioning system described in the embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 10-oil separator; 11-oil separator oil outlet; 12-oil separator inlet; 13-oil separator refrigerant outlet;

[0023] 20 - oil cooler; 21 - oil inlet of oil cooler; 22 - oil outlet of oil cooler; 23 - coolant inlet of oil cooler; 24 - coolant outlet of oil cooler;

[0024] 30 - compressor; 31 - compressor suction port; 32 - compressor outlet;

[0025] 40 - evaporator; 41 - evaporator refrigerant inlet; 42 - evaporator refrigerant outlet; 43 - evaporator refrigerant outlet; 44 - evaporator refrigerant inlet;

[0026] 50 - cooling unit; 51 - cooling medium inlet of cooling unit; 52 - cooling medium outlet of cooling unit;

[0027] 60 - variable frequency water pump; 61 - variable frequency water pump water inlet; 62 - variable frequency water pump water outlet;

[0028] 70 - condenser; 71 - condenser refrigerant inlet; 72 - condenser refrigerant outlet; 73 - condenser fan;

[0029] 81 - first temperature detection unit; 82 - second temperature detection unit; 83 - first control valve; 84 - second control valve; 85 - third control valve; 86 - flow regulating unit; 87 - capillary tube; 88 - throttling element;

[0030] 91 - chilled water supply pipeline; 92 - chilled water return pipeline; 93 - first pipeline; 94 - second pipeline; 95 - third pipeline; 96 - fourth pipeline; 97 - fifth pipeline; 98 - sixth pipeline; 99 - seventh pipeline; 100 - eighth pipeline. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0032] Reference Figure 1 , which shows a schematic diagram of an air conditioning system provided by an embodiment of the utility model. The utility model embodiment discloses an air conditioning system, which can enable certain places to obtain air with a certain temperature, humidity and air quality to meet the requirements of users and production processes and improve labor hygiene and indoor climate conditions.

[0033] The air conditioning system includes a compressor 30, an oil separator 10, a condenser 70, a throttling element 88, and an evaporator 40. Figure 1 As shown, the compressor outlet 32 ​​of the compressor 30 is connected to the oil separator inlet 12 of the oil separator 10, the oil separator refrigerant outlet 13 of the oil separator 10 is connected to the condenser refrigerant inlet 71 of the condenser 70, the condenser refrigerant outlet 72 of the condenser 70 is connected to the throttling element refrigerant inlet of the throttling element 88, the throttling element refrigerant outlet of the throttling element 88 is connected to the evaporator refrigerant inlet 44 of the evaporator 40, and the evaporator refrigerant outlet 43 of the evaporator 40 is connected to the compressor suction port 31.

[0034] Among them, the compressor 30 is a driven fluid machine that boosts low-pressure gas to high-pressure gas. The compressor 30 inhales low-temperature and low-pressure refrigerant gas through the compressor suction port 31, and after the motor drives the piston to compress the refrigerant gas, it discharges high-temperature and high-pressure refrigerant gas through the compressor outlet 32 ​​to provide power for the refrigeration cycle. The refrigeration cycle includes the process of compression of the refrigerant → condensation (heat release) → expansion → evaporation (heat absorption). The compressor 30 is divided into piston compressors, screw compressors, centrifugal compressors, linear compressors and the like. The compressor 30 is not specifically limited in the embodiment of the present application, and it is sufficient to meet the use requirements of the air-conditioning system.

[0035] The function of the oil separator 10 is to separate the refrigerant gas and lubricating oil in the high-temperature and high-pressure gas discharged from the compressor 30, so as to avoid the excessive amount of lubricating oil in the refrigerant gas affecting the heat transfer effect in the condenser 70 and the evaporator 40, and ensure the safe and efficient operation of the air-conditioning system. The simple working principle of the oil separator 10 is as follows: after the high-temperature and high-pressure gas (including refrigerant gas and lubricating oil) discharged from the compressor outlet 32 ​​of the compressor 30 enters the oil separator 10, it enters the guide vane of the oil separator 10, flows along the guide vane in a spiral shape, and relies on centrifugal force and gravity to separate the lubricating oil from the refrigerant gas, and flows down along the inner wall of the cylinder. The refrigerant gas is led out of the oil separator 10 through the central pipe through the porous baffle. The separated lubricating oil is concentrated in the lower part of the oil separator 10 and discharged through the oil separator oil outlet 11.

[0036] The condenser 70 is a type of heat exchanger that can convert gas or steam into liquid and transfer the heat in the tube in a very fast way. The working process of the condenser 70 is a heat release process. In the air conditioning system, high-temperature and high-pressure refrigerant gas enters the condenser 70 through the condenser refrigerant inlet 71, releases heat to the cooling medium (water or air) in the condenser 70, and condenses into low-temperature and high-pressure refrigerant liquid.

[0037] Further, see Figure 1 As shown, the air conditioning system is also provided with a condensing fan 73, which blows toward the condenser 70, so that the high-temperature and high-pressure refrigerant gas in the condenser 70 is condensed into a low-temperature and high-pressure refrigerant liquid. Of course, other methods can also be used in the air conditioning system, such as cooling water to condense the high-temperature and high-pressure refrigerant gas into a low-temperature and high-pressure refrigerant liquid, which is not specifically limited in the embodiment of the present application.

[0038] The throttling element 88 is one of the basic components in the air conditioning system. The function of the throttling element 88 is to reduce the pressure of the low-temperature and high-pressure refrigerant liquid from the condenser 70 into a low-pressure and low-temperature refrigerant liquid. In the embodiment of the present application, the specific structure of the throttling element 88 can be selected according to the use requirements. For example, the throttling element 88 is a capillary tube, a throttling short tube, a thermal expansion valve, an electronic expansion valve, etc.

[0039] The evaporator 40 is used to convert liquid substances into gaseous objects. The evaporator 40 in the air-conditioning system is used to exchange heat between the low-pressure and low-temperature refrigerant liquid and the coolant. The low-pressure and low-temperature refrigerant liquid vaporizes and absorbs heat, and the low-pressure and low-temperature refrigerant liquid is converted into a low-pressure and low-temperature refrigerant gas; the coolant releases heat and cools down to achieve a refrigeration effect.

[0040] In the embodiment of the present application, the specific structure of the evaporator 40 can be selected according to the use requirements. For example, the evaporator 40 is one of a shell and tube heat exchanger, a plate heat exchanger, and a shell and tube heat exchanger.

[0041] The shell-and-tube heat exchanger is a concentric shell-and-tube heat exchanger that uses two standard tubes of different sizes to connect. The outer tube is called the shell side, and the inner tube side is called the tube side. Two different media can flow in the shell side and the tube side in reverse (or in the same direction) to achieve the effect of heat exchange.

[0042] Plate heat exchanger is a kind of high-efficiency heat exchanger made of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Plate heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, wide application and long service life.

[0043] Shell and tube heat exchanger is a traditional heat exchanger with the advantages of easy manufacturing, low production cost, large processing capacity and easy maintenance.

[0044] The refrigerant is selected according to specific usage requirements. For example, the refrigerant is chilled water, or a glycol mixture, etc.

[0045] In the embodiment of the present application, the above-mentioned compressor 30, oil separator 10, condenser 70, throttling element 88 and evaporator 40 of the air-conditioning system are connected as the refrigerant side of the air-conditioning system, and the refrigerant flows back to the compressor 30 through the compressor 30, oil separator 10, condenser 70, throttling element 88 and evaporator 40 in sequence for circulation.

[0046] The compressor 30, the oil separator 10, the condenser 70, the throttling element 88 and the evaporator 40 in the air conditioning system are all connected by pipelines. Figure 1As shown, the compressor outlet 32 ​​of the compressor 30 is connected to the oil separator inlet 12 of the oil separator 10 through the seventh pipeline 99, the oil separator refrigerant outlet 13 of the oil separator 10 is connected to the condenser refrigerant inlet 71 of the condenser 70 through the fourth pipeline 96, the condenser refrigerant outlet 72 of the condenser 70 is connected to the throttling element refrigerant inlet of the throttling element 88 through the fifth pipeline 97, the throttling element refrigerant outlet of the throttling element 88 is connected to the evaporator refrigerant inlet 44 of the evaporator 40 through the sixth pipeline 98, and the evaporator refrigerant outlet 43 of the evaporator 40 is connected to the compressor suction port 31 through the eighth pipeline 100.

[0047] The refrigerant of the air conditioning system circulates on the refrigerant side as follows: the high-temperature and high-pressure refrigerant carries the lubricating oil and is discharged from the compressor outlet 32, and then enters the oil separator 10 through the oil separator inlet 12. The oil separator 10 separates the high-temperature and high-pressure refrigerant gas and the lubricating oil, and the separated high-temperature and high-pressure refrigerant gas is discharged through the oil separator refrigerant outlet 13 of the oil separator 10, and the separated lubricating oil is discharged through the oil separator oil outlet 11 of the oil separator 10. The high-temperature and high-pressure refrigerant gas discharged from the oil separator refrigerant outlet 13 enters the condenser 70 through the condenser refrigerant inlet 71, and the condenser 70 condenses the high-temperature and high-pressure refrigerant gas into a low-temperature and high-pressure refrigerant liquid. Then, the low-temperature and high-pressure refrigerant liquid is discharged through the condenser refrigerant outlet 72 of the condenser 70. The low-temperature and high-pressure refrigerant liquid discharged from the condenser refrigerant outlet 72 becomes a low-pressure and low-temperature refrigerant liquid after passing through the throttling element 88. The low-pressure and low-temperature refrigerant liquid then enters the evaporator 40 through the evaporator refrigerant inlet 44 of the evaporator 40. The evaporator 40 vaporizes the low-pressure and low-temperature refrigerant liquid into a low-pressure and low-temperature refrigerant gas. The low-pressure and low-temperature refrigerant gas is discharged from the evaporator refrigerant outlet 43 of the evaporator 40 and then mixed with the lubricating oil discharged from the oil separator oil outlet 11 of the oil separator 10. The mixed refrigerant gas and lubricating oil enter the compressor 30 again through the compressor suction port 31. This completes a refrigerant cycle.

[0048] Reference Figure 1As shown, the air conditioning system of the embodiment of the present application further includes an oil cooler 20, a chilled water supply pipeline 91, a chilled water return pipeline 92, a first pipeline 93 and a first control valve 83. The oil separator oil outlet 11 of the oil separator 10 is connected to the oil cooler oil inlet 21 of the oil cooler 20, and the oil cooler oil outlet 22 of the oil cooler 20 is connected to the compressor suction port 31 of the compressor 30; the evaporator refrigerant inlet 41 of the evaporator 40 is connected to the chilled water return pipeline 92, and the evaporator refrigerant outlet 42 of the evaporator 40 is connected to the chilled water supply pipeline 91; one end of the first pipeline 93 is connected to the chilled water return pipeline 92 or the chilled water supply pipeline 91, and the other end of the first pipeline 93 is connected to the oil cooler refrigerant inlet 23 of the oil cooler 20; the first control valve 83 is arranged on the first pipeline 93.

[0049] The oil separator 10, the oil cooler 20, and the compressor 30 are all connected by pipelines. Figure 1 As shown, the oil separator oil outlet 11 of the oil separator 10 is connected to the oil cooler oil inlet 21 of the oil cooler 20 through the second pipeline 94, the oil cooler oil outlet 22 of the oil cooler 20 is connected to the eighth pipeline 100, and is connected to the compressor intake port 31 of the compressor 30 through the eighth pipeline 100.

[0050] In the embodiment of the present application, the low-pressure and low-temperature refrigerant liquid discharged from the throttling element 88 enters the evaporator 40 through the evaporator refrigerant inlet 44 of the evaporator 40, and exchanges heat with the refrigerant entering the evaporator 40 through the evaporator refrigerant inlet 41, and the low-pressure and low-temperature refrigerant liquid vaporizes into a low-pressure and low-temperature refrigerant gas. The refrigerant releases heat and its temperature decreases. The low-pressure and low-temperature refrigerant gas is discharged from the evaporator 40 through the evaporator refrigerant outlet 43, and the refrigerant with reduced temperature is discharged from the evaporator 40 through the evaporator refrigerant outlet 42.

[0051] The evaporator refrigerant inlet 41 of the evaporator 40 is connected to the chilled water return pipeline 92, and the evaporator refrigerant outlet 42 of the evaporator 40 is connected to the chilled water supply pipeline 91. The chilled water supply pipeline 91 and the chilled water return pipeline 92 are both used for the flow of refrigerant. The chilled water supply pipeline 91 and the chilled water return pipeline 92 are used to connect with external components. The refrigerant absorbs heat in the external components and the temperature increases to achieve the cooling effect.

[0052] In the embodiment of the present application, one end of the first pipeline 93 is connected to the chilled water return pipeline 92 or the chilled water supply pipeline 91, and the other end of the first pipeline 93 is connected to the oil cooler coolant inlet 23 of the oil cooler 20. The coolant in the chilled water return pipeline 92 or the chilled water supply pipeline 91 can enter the oil cooler 20 through the first pipeline 93 and the oil cooler coolant inlet 23. The coolant entering the oil cooler 20 exchanges heat with the lubricating oil entering the oil cooler 20 through the oil cooler oil inlet 21. After the temperature of the lubricating oil decreases, it is discharged from the oil cooler 20 through the oil cooler oil outlet 22. After the temperature of the coolant increases, it is discharged from the oil cooler 20 through the oil cooler coolant outlet 24.

[0053] In the air conditioning system of the embodiment of the present application, the oil cooler 20 obtains the refrigerant flowing to the evaporator 40 through the first pipeline 93 and the chilled water return pipeline 92, or the oil cooler 20 obtains the refrigerant flowing out of the evaporator 40 through the first pipeline 93 and the chilled water supply pipeline 91. The oil cooler 20 uses the refrigerant entering the oil cooler 20 to cool the lubricating oil. The lubricating oil with reduced temperature enters the compressor suction port 31, which solves the problem of harmful overheating of the compressor suction port 31 caused by excessive lubricating oil temperature. Moreover, the refrigerant is obtained from the chilled water return pipeline 92 or the chilled water supply pipeline 91 as the cold source of the oil cooler 20, and the relevant devices and pipelines can be integrated into the whole unit of the air conditioning system, which is convenient for installation and use in engineering.

[0054] In this embodiment, the flow rate of the refrigerant can be adjusted by controlling the opening of the first control valve 83, so that the temperature of the lubricating oil flowing out of the oil cooler 20 is relatively constant, and the cooling effect of the refrigerant on the lubricating oil is stable, thereby ensuring that the temperature at the compressor intake port 31 is relatively stable.

[0055] Furthermore, if the lubricating oil temperature is too high, the viscosity of the oil is too low, and a suitable oil film cannot be formed, which affects the operating stability of the air conditioning system unit; if the lubricating oil temperature is too low, the viscosity of the oil is too high, which will cause excessive power consumption of the compressor 30; and when the return oil temperature is low, the efficiency of the oil separator 10 decreases, which has an adverse effect on the separation of the lubricating oil. This embodiment can control the flow of the coolant flowing into the oil cooler 20 by adjusting the opening of the first control valve 83, so that the temperature of the lubricating oil flowing out of the oil cooler 20 meets the use requirements.

[0056] Optionally, in a specific embodiment, refer to Figure 1As shown, the oil cooler 20 obtains the coolant flowing to the evaporator 40 through the first pipeline 93 and the chilled water return pipeline 92. The low-temperature coolant discharged from the evaporator coolant outlet 42 flows in the chilled water supply pipeline 91. The low-temperature coolant absorbs heat after passing through the external components, and the temperature of the low-temperature coolant increases to become the coolant with increased temperature. The coolant with increased temperature flows back to the evaporator 40 through the chilled water return pipeline 92.

[0057] When the oil cooler 20 obtains the coolant flowing to the evaporator 40 through the first pipeline 93 and the chilled water return pipeline 92, it will not affect the cooling and heat absorption of the coolant on the external components, that is, it will not affect the cooling capacity of the air conditioning system, and avoid the reduction of the energy efficiency of the air conditioning system due to the cooling of the lubricating oil. That is, the air conditioning system of the embodiment of the present application can cool the lubricating oil without reducing its energy efficiency, solving the problem of harmful superheat of the compressor suction port 31 caused by the excessively high temperature of the lubricating oil.

[0058] The oil cooler 20 is used to cool the lubricating oil through the coolant. The oil cooler 20 is a type of heat exchanger, and is one of a shell-and-tube heat exchanger, a plate heat exchanger, and a shell-and-tube heat exchanger. The description of the shell-and-tube heat exchanger, the plate heat exchanger, and the shell-and-tube heat exchanger can refer to the above content, and the embodiments of the present application do not specifically limit it.

[0059] Optionally, the first control valve 83 can be selected according to the use requirements, and the embodiment of the present application does not specifically limit this. For example, the first control valve 83 is a stepless regulating valve.

[0060] Among them, the stepless control valve is a valve that can achieve stepless regulation of flow and pressure. The opening of the stepless control valve can be adjusted continuously to control the size of the liquid flow and the pressure in the system to adapt to different working occasions and needs. In addition to achieving flow control, the stepless control valve can also effectively reduce the pressure fluctuation of the hydraulic system and ensure the smooth operation of the air conditioning system.

[0061] Optionally, the air-conditioning system also includes a first temperature detection unit 81 and a controller, the first temperature detection unit 81 is connected to the oil cooler outlet 22; the controller is respectively connected to the first temperature detection unit 81 and the first control valve 83, and the controller is used to adjust the opening of the first control valve 83 according to the oil outlet temperature of the oil cooler outlet 22 detected by the first temperature detection unit 81.

[0062] In the air conditioning system of the embodiment of the present application, the first temperature detection unit 81 is connected to the oil cooler oil outlet 22, and is used to detect the outlet oil temperature of the lubricating oil at the oil cooler oil outlet 22. The controller is connected to the first temperature detection unit 81 and the first control valve 83 respectively, and the controller adjusts the opening of the first control valve 83 according to the outlet oil temperature of the oil cooler oil outlet 22 detected by the first temperature detection unit 81, so that the outlet oil temperature of the lubricating oil flowing out of the oil cooler 20 remains relatively constant, thereby making the temperature at the compressor suction port 31 relatively stable, thereby ensuring the effective operation of the air conditioning system.

[0063] The embodiment of the present application does not specifically limit the structure of the first temperature detection unit 81 , and it only needs to meet the requirement of detecting the outlet temperature of the lubricating oil at the oil outlet 22 of the oil cooler. For example, the first temperature detection unit is a temperature sensor.

[0064] The controller can also be set according to usage requirements, for example, the controller is an air conditioning system controller.

[0065] Optional, see Figure 1 As shown, the air conditioning system also includes a second pipeline 94 and a flow regulating unit 86 ; the oil separator oil outlet 11 and the oil cooler oil inlet 21 are connected via the second pipeline 94 ; the flow regulating unit 86 is connected to the second pipeline 94 , and the flow regulating unit 86 is used to regulate the flow in the second pipeline 94 .

[0066] In the embodiment of the present application, the lubricating oil discharged from the oil separator oil outlet 11 flows through the second pipeline 94 and then enters the oil cooler 20 through the oil cooler oil inlet 21. When the lubricating oil flows through the second pipeline 94, it passes through the flow regulating unit 86, and the flow regulating unit 86 is used to regulate the flow of the lubricating oil in the second pipeline 94 to prevent the lubricating oil from mixing with the refrigerant gas and diluting the refrigerant gas, thereby affecting the working efficiency of the compressor 30.

[0067] Optionally, the flow regulating unit 86 is at least one of a capillary tube 87 and a second control valve 84 . The embodiment of the present application does not limit the specific structure of the flow regulating unit 86 , and it only needs to meet the flow regulation demand for the lubricating oil.

[0068] The capillary tube 87 refers to a tube with a very thin inner diameter. The capillary tube 87 can meet the requirements of air conditioning systems under different working conditions through various combinations of length and diameter. The inner diameter of the capillary tube is not specifically limited in this application, as long as it meets the use requirements.

[0069] The second control valve 84 can be selected according to the use requirements, and the embodiment of the present application does not specifically limit this. For example, the second control valve 84 is also a stepless regulating valve.

[0070] Further references Figure 1As shown, a capillary tube 87 and a second control valve 84 are provided in the air-conditioning system. The capillary tube 87 and the second control valve 84 are respectively connected to the second pipeline 94. When the lubricating oil flows on the second pipeline 94, it needs to flow through the capillary tube 87 and the second control valve 84 and then enter the oil cooler 20 through the oil cooler oil inlet 21.

[0071] Optional, see Figure 1 As shown, the air-conditioning system also includes a third pipeline 95, a heat dissipation unit 50, a third control valve 85 and an intelligent power module; one end of the third pipeline 95 is connected to the chilled water return pipeline 92 or the chilled water supply pipeline 91, and the other end of the third pipeline 95 is connected to the heat dissipation unit refrigerant inlet 51 of the heat dissipation unit 50; the third control valve 85 is arranged on the third pipeline 95; the heat dissipation unit 50 is connected to the intelligent power module, and the heat dissipation unit 50 is used to dissipate heat from the intelligent power module.

[0072] In the embodiment of the present application, one end of the third pipeline 95 is connected to the chilled water return pipeline 92 or the chilled water supply pipeline 91, and the other end of the third pipeline 95 is connected to the cooling unit refrigerant inlet 51 of the cooling unit 50. The refrigerant in the chilled water return pipeline 92 or the chilled water supply pipeline 91 can enter the cooling unit 50 through the third pipeline 95 and the cooling unit refrigerant inlet 51. The refrigerant entering the cooling unit 50 exchanges heat with the intelligent power module through the cooling unit 50, and the refrigerant absorbs the heat of the intelligent power module to achieve cooling of the intelligent power module. The refrigerant with increased temperature is discharged from the cooling unit 50 through the cooling unit refrigerant outlet 52.

[0073] In the air conditioning system of the embodiment of the present application, the heat dissipation unit 50 obtains the refrigerant flowing to the evaporator 40 through the third pipeline 95 and the chilled water return pipeline 92, or the heat dissipation unit 50 obtains the refrigerant flowing out of the evaporator 40 through the third pipeline 95 and the chilled water supply pipeline 91, and the heat dissipation unit 50 uses the refrigerant to enter the heat dissipation unit 50 to cool the intelligent power module, thereby solving the problem of electronic equipment failure caused by the high temperature of the intelligent power module. Moreover, the refrigerant is obtained from the chilled water return pipeline 92 or the chilled water supply pipeline 91 as the cold source of the heat dissipation unit 50, and the relevant devices and pipelines can be integrated into the whole unit of the air conditioning system, which is convenient for installation and use in engineering. In this embodiment, the temperature of the refrigerant flowing out of the heat dissipation unit refrigerant outlet 52 of the heat dissipation unit 50 can be relatively constant by controlling the opening of the third control valve 85 to ensure the stable cooling effect on the intelligent power module; the temperature of the intelligent power module is relatively stable, which can make the electronic equipment equipped with the intelligent power module work stably.

[0074] Optionally, in a specific embodiment, refer to Figure 1As shown, the heat dissipation unit 50 obtains the coolant flowing to the evaporator 40 through the third pipeline 95 and the chilled water return pipeline 92, which will not affect the cooling and heat absorption of the coolant on the external components, that is, it will not affect the cooling capacity of the air-conditioning system, and avoid the reduction of the energy efficiency of the air-conditioning system due to the cooling of the lubricating oil. That is, the air-conditioning system of the embodiment of the present application can realize the cooling of the intelligent power module without reducing its energy efficiency, and solves the problem that the temperature of the intelligent power module is too high and causes the electronic equipment equipped with the intelligent power module to malfunction.

[0075] Furthermore, the use of frequency conversion technology can automatically adjust the speed and voltage of the motor according to the actual demand of the load, thereby achieving the optimal utilization of energy. Compared with the traditional constant frequency technology, the motor controlled by frequency conversion can reduce the speed and power at low load to achieve the purpose of energy saving. Therefore, the application of frequency conversion technology can significantly reduce the power consumption of the air-conditioning system, reduce energy waste, and achieve the dual effects of environmental protection and economy. In the air-conditioning system, the rotating mechanical parts including the compressor 30, the fan, the water pump, etc. need to be driven by the drive board or the inverter to work. Under some special working conditions, these rotating machines need to operate at high frequency to meet the refrigeration demand, but the power of electronic components is also increasing during high-frequency operation. The poor heat dissipation of the drive board or the inverter will cause electronic equipment failure. The above structure in the air-conditioning system can realize the cooling of the intelligent power module. When the intelligent power module is set in the compressor 30, the fan, the water pump, etc., the compressor 30, the fan, the water pump, etc. can ensure the temperature operation under high-frequency operation, thereby reducing the failure rate of the air-conditioning system.

[0076] Optionally, the air-conditioning system also includes a second temperature detection unit 82, which is connected to the heat dissipation unit refrigerant outlet 52 of the heat dissipation unit 50; the controller is respectively connected to the second temperature detection unit 82 and the third control valve 85, and is used to adjust the opening of the third control valve 85 according to the refrigerant temperature of the heat dissipation unit refrigerant outlet 52 detected by the second temperature detection unit 82.

[0077] In the air conditioning system of the embodiment of the present application, the second temperature detection unit 82 is connected to the cooling unit coolant outlet 52 of the cooling unit 50, and the second temperature detection unit 82 is used to detect the coolant temperature of the coolant at the cooling unit coolant outlet 52. The controller is connected to the second temperature detection unit 82 and the third control valve 85 respectively, and the controller is used to adjust the opening of the third control valve 85 according to the coolant temperature of the cooling unit coolant outlet 52 detected by the second temperature detection unit 82, so that the coolant temperature of the coolant flowing out of the cooling unit coolant outlet 52 remains relatively constant, thereby making the temperature at the intelligent power module relatively stable, and ensuring the effective operation of the air conditioning system.

[0078] Among them, the embodiment of the present application does not specifically limit the structure of the second temperature detection unit 82, and it only needs to meet the detection requirements of the coolant temperature of the coolant flowing out of the coolant outlet 52 of the heat dissipation unit. For example, the second temperature detection unit 82 is a temperature sensor.

[0079] Optionally, in a specific embodiment, the oil cooler coolant outlet 24 of the oil cooler 20 is connected to the heat dissipation unit coolant inlet 51 .

[0080] That is, after the oil cooler 20 performs heat exchange, the coolant with increased temperature is discharged from the oil cooler coolant outlet 24 and enters the heat dissipation unit 50 through the heat dissipation unit coolant inlet 51 to continue to be used for heat dissipation of the intelligent power module.

[0081] Optionally, in another specific embodiment, the oil cooler refrigerant outlet 24 of the oil cooler 20 is connected to the evaporator refrigerant inlet 41 of the evaporator 40. That is, the refrigerant whose temperature rises after the heat exchange in the oil cooler 20 is discharged from the oil cooler refrigerant outlet 24 and then enters the evaporator 40 through the evaporator refrigerant inlet 41. This part of the refrigerant and the refrigerant entering the evaporator 40 through the chilled water return pipe 92 are cooled by heat release and then flow out from the evaporator refrigerant outlet 42. The above structure in the embodiment of the present application can realize the circulation of the refrigerant and avoid the loss of the refrigerant.

[0082] Optionally, in a specific embodiment, the heat dissipation unit refrigerant outlet 52 of the heat dissipation unit 50 is connected to the evaporator refrigerant inlet 41 of the evaporator 40. That is, the refrigerant whose temperature rises after heat exchange in the heat dissipation unit 50 is discharged from the heat dissipation unit refrigerant outlet 52 and then enters the evaporator 40 through the evaporator refrigerant inlet 41. This part of the refrigerant and the refrigerant entering the evaporator 40 through the chilled water return pipe 92 are cooled and discharged from the evaporator refrigerant outlet 42. The above structure in the embodiment of the present application can also realize the circulation of the refrigerant and avoid the loss of the refrigerant.

[0083] Optionally, in another specific embodiment, the cooling unit coolant outlet 52 of the cooling unit 50 is connected to an external device. Since the intelligent power module generates a large amount of heat during operation, after the coolant exchanges heat with the intelligent power module in the cooling unit 50, the temperature of the coolant flowing out of the cooling unit coolant outlet 52 is relatively high, for example, it can reach 40 degrees or above. Therefore, the coolant flowing out of the cooling unit coolant outlet 52 can be used for heating external devices, washing of users, etc.

[0084] Optional, see Figure 1As shown, the air-conditioning system also includes a variable frequency water pump 60, which is connected to the third pipeline 95, and the variable frequency water pump water inlet 61 of the variable frequency water pump 60 is respectively connected to the third control valve outlet of the third control valve 85 and the oil cooler refrigerant outlet 24 of the oil cooler 20, and the variable frequency water pump outlet 62 is connected to the heat dissipation unit refrigerant inlet 51 of the heat dissipation unit 50; a controller is connected to the variable frequency water pump 60, and the controller is used to adjust the operating frequency of the variable frequency water pump 60 according to the oil outlet temperature of the oil cooler oil outlet 22 detected by the first temperature detection unit 81, the refrigerant temperature of the heat dissipation unit refrigerant outlet 52 detected by the second temperature detection unit 82, the opening of the first control valve 83 and the opening of the third control valve 85.

[0085] In an embodiment of the present application, the controller is used to adjust the operating frequency of the variable frequency water pump 60 according to the oil outlet temperature of the oil cooler oil outlet 22 detected by the first temperature detection unit 81, the refrigerant temperature of the heat dissipation unit refrigerant outlet 52 detected by the second temperature detection unit 82, the opening of the first control valve 83 and the opening of the third control valve 85, so as to achieve the purpose of adjusting the oil outlet temperature of the oil cooler oil outlet 22 and the refrigerant temperature of the heat dissipation unit refrigerant outlet 52, avoid the harmful overheating of the compressor suction port 31 caused by the return of lubricating oil, and improve the cooling capacity of the air-conditioning system; and avoid the problem of poor heat dissipation when the intelligent power module operates at high frequency, reduce air-conditioning system failures, and improve the operating stability of the air-conditioning system.

[0086] A specific embodiment of the air conditioning system of the present application and the working process of the specific embodiment are as follows, referring to Figure 1 As shown: the air conditioning system mainly includes an oil separator 10, an oil cooler 20, a compressor 30, an evaporator 40, a heat dissipation unit 50, a variable frequency water pump 60, a condenser 70, and a throttling element 88, and the above structures are all connected through pipelines.

[0087] Further references Figure 1 As shown, on the refrigerant side of the air-conditioning system: the compressor outlet 32 ​​of the compressor 30 is connected to the oil separator inlet 12 of the oil separator 10 through the seventh pipeline 99, the oil separator refrigerant outlet 13 of the oil separator 10 is connected to the condenser refrigerant inlet 71 of the condenser 70 through the fourth pipeline 96, the condenser refrigerant outlet 72 of the condenser 70 is connected to the throttling element refrigerant inlet of the throttling element 88 through the fifth pipeline 97, the throttling element refrigerant outlet of the throttling element 88 is connected to the evaporator refrigerant inlet 44 of the evaporator 40 through the sixth pipeline 98, and the evaporator refrigerant outlet 43 of the evaporator 40 is connected to the compressor suction port 31 through the eighth pipeline 100.

[0088] Bypass oil return side of the air conditioning system: the oil separator oil outlet 11 of the oil separator 10 is connected to the second control valve oil inlet of the second control valve 84 through the second pipeline 94, the second control valve oil outlet of the second control valve 84 is connected to the capillary oil inlet of the capillary 87 through the second pipeline 94, the capillary oil outlet of the capillary 87 is connected to the oil cooler oil inlet 21 of the oil cooler 20 through the second pipeline 94 (in this part, the oil separator oil outlet 11 is connected to the oil cooler oil inlet 21 through the second pipeline 94, and the second control valve 84 and the capillary 87 are respectively arranged on the second pipeline 94), the oil cooler oil outlet 22 of the oil cooler 20 is connected to the eighth pipeline 100, and is connected to the compressor suction port 31 of the compressor 30 through the eighth pipeline 100. A first temperature detection unit 81 is arranged between the oil cooler oil outlet 22 and the eighth pipeline 100.

[0089] Bypass oil return side cooling of the air conditioning system: The chilled water return pipe 92 is connected to the evaporator coolant inlet 41 of the evaporator 40, and the evaporator coolant outlet 42 of the evaporator 40 is connected to the chilled water supply pipe 91. One end of the first pipe 93 is connected to the chilled water return pipe 92, and the other end of the first pipe 93 is connected to the oil cooler coolant inlet 23 of the oil cooler 20. The first control valve 83 is provided on the first pipe 93.

[0090] Intelligent power module cooling of air conditioning system: One end of the third pipeline 95 is connected to the chilled water return pipeline 92, and the other end of the third pipeline 95 is connected to the cooling unit coolant inlet 51 of the cooling unit 50. The third pipeline 95 is provided with a variable frequency water pump 60 and a first control valve 83. The oil cooler coolant outlet 24 of the oil cooler 20 is connected to the third pipeline 95 through a pipeline, and the connection position is located between the variable frequency water pump 60 and the first control valve 83. The second temperature detection unit 82 is provided at the cooling unit coolant outlet 52.

[0091] The refrigerant of the air conditioning system circulates on the refrigerant side as follows: the high-temperature and high-pressure refrigerant carries the lubricating oil and is discharged from the compressor outlet 32, and then enters the oil separator 10 through the oil separator inlet 12. The oil separator 10 separates the high-temperature and high-pressure refrigerant gas and the lubricating oil, and the separated high-temperature and high-pressure refrigerant gas is discharged through the oil separator refrigerant outlet 13 of the oil separator 10, and the separated lubricating oil is discharged through the oil separator oil outlet 11 of the oil separator 10. The high-temperature and high-pressure refrigerant gas discharged from the oil separator refrigerant outlet 13 enters the condenser 70 through the condenser refrigerant inlet 71, and the condenser 70 condenses the high-temperature and high-pressure refrigerant gas into a low-temperature and high-pressure refrigerant liquid, and then the low-temperature and high-pressure refrigerant liquid is discharged through the condenser refrigerant outlet 72 of the condenser 70. The low-temperature and high-pressure refrigerant liquid discharged from the condenser refrigerant outlet 72 becomes a low-pressure and low-temperature refrigerant liquid after passing through the throttling element 88. The low-pressure and low-temperature refrigerant liquid then enters the evaporator 40 through the evaporator refrigerant inlet 44 of the evaporator 40. The evaporator 40 vaporizes the low-pressure and low-temperature refrigerant liquid into a low-pressure and low-temperature refrigerant gas. The low-pressure and low-temperature refrigerant gas is discharged from the evaporator refrigerant outlet 43 of the evaporator 40 and then mixed with the lubricating oil discharged from the oil cooler oil outlet 22 of the oil cooler 20. The refrigerant gas and the lubricating oil are mixed and then enter the compressor 30 again through the compressor suction port 31 of the compressor 30. This completes a refrigerant cycle.

[0092] In the air conditioning system, the circulation process of the lubricating oil on the bypass oil return side is that the oil separator 10 separates the high-temperature and high-pressure refrigerant gas and the lubricating oil, and the separated lubricating oil is discharged through the oil separator oil outlet 11 of the oil separator 10, and then the lubricating oil passes through the second control valve 84 and the capillary tube 87 in sequence, and then enters the oil cooler 20 through the oil cooler oil inlet 21. After the lubricating oil is cooled in the oil cooler 20, it is discharged through the oil cooler oil outlet 22 into the eighth pipeline 100, and after mixing with the refrigerant gas in the eighth pipeline 100, it enters the compressor 30 through the compressor suction port 31.

[0093] The cooling process of the bypass oil return side in the air conditioning system is as follows: the brine in the chilled water return pipe 92 enters the oil cooler 20 through the first pipe 93 and the oil cooler brine inlet 23 of the oil cooler 20, the brine performs heat exchange with the lubricating oil in the oil cooler 20 in the oil cooler 20, the temperature of the brine rises and is discharged through the oil cooler brine outlet 24 of the oil cooler 20, and the brine discharged from the oil cooler brine outlet 24 flows into the variable frequency water pump 60; the temperature of the lubricating oil decreases and is discharged through the oil cooler oil outlet 22 of the oil cooler 20. In this process, the controller adjusts the opening of the first control valve 83 and the operating frequency of the variable frequency water pump 60 according to the oil outlet temperature of the oil cooler oil outlet 22 detected by the first temperature detection unit 81, so that the oil outlet temperature of the lubricating oil flowing out of the oil cooler 20 remains relatively constant, thereby making the temperature at the compressor suction port 31 relatively stable, thereby ensuring the effective operation of the air conditioning system.

[0094] The cooling process of the intelligent power module in the air conditioning system is as follows: the brine in the chilled water return pipe 92 enters the heat dissipation unit 50 through the third pipe 95 and the heat dissipation unit brine inlet 51 of the heat dissipation unit 50. In this process, the brine also passes through the third control valve 85 and the variable frequency water pump 60 in sequence. The brine exchanges heat with the intelligent power module in the heat dissipation unit 50, and the brine absorbs the heat of the intelligent power module and the temperature rises. The brine with the increased temperature is discharged through the heat dissipation unit brine outlet 52 of the heat dissipation unit 50. The controller adjusts the opening of the third control valve 85 and the operating frequency of the variable frequency water pump 60 according to the brine temperature of the heat dissipation unit brine outlet 52 detected by the second temperature detection unit 82, so that the temperature of the brine flowing out of the heat dissipation unit brine outlet 52 is relatively constant, so as to ensure the stable cooling effect on the intelligent power module, thereby making the electronic equipment equipped with the intelligent power module work stably.

[0095] The air conditioning system of the embodiment of the present application utilizes the refrigerant (such as chilled water) return water generated by the air conditioning system itself to supply the bypass return oil side in the air conditioning system, thereby reducing the return oil temperature of the lubricating oil, avoiding the harmful overheating of the compressor suction port 31 caused by the lubricating oil return, reducing the suction specific volume of the compressor 30, and thus improving the cooling capacity of the air conditioning system. The refrigerant return water generated by the air conditioning system itself is also supplied to the heat dissipation unit 50, which cools the intelligent power module on the driver or drive board of the variable frequency motor, reducing the problem of poor heat dissipation of electronic components when the variable frequency motor is running at high frequency, reducing failures, and improving the stability of system operation.

[0096] The present application also provides a control method for an air conditioning system. The control method is applied to the above-mentioned air conditioning system. Figure 2 As shown, the method comprises the following steps:

[0097] S11 , detecting the oil outlet temperature of the oil cooler oil outlet 22 of the oil cooler 20 .

[0098] S12, controlling the opening of the first control valve 83 according to the oil outlet temperature so that the oil outlet temperature is within a preset oil temperature range.

[0099] In this step, the first temperature detection unit 81 detects the oil outlet temperature of the oil cooler oil outlet 22, and the controller controls the opening of the first control valve 83 according to the oil outlet temperature so that the oil outlet temperature is within a preset oil temperature range.

[0100] Furthermore, the oil outlet temperature detected by the first temperature detection unit 81 is T1, and the controller compares T1 with a preset oil temperature range. The two end points in the preset oil temperature range are: lubricating oil target temperature + oil temperature deviation value, lubricating oil target temperature - oil temperature deviation value.

[0101] When T1>lubricating oil target temperature+oil temperature deviation value, the controller increases the opening of the first control valve 83 .

[0102] When the lubricating oil target temperature+the oil temperature deviation value ≥ T1 ≥ the lubricating oil target temperature−the oil temperature deviation value, the opening degree of the first control valve 83 is maintained unchanged.

[0103] When the lubricating oil target temperature minus the oil temperature deviation value> T1, the controller reduces the opening of the first control valve 83.

[0104] The control method of the air-conditioning system in the embodiment of the present application can reduce the return oil temperature of the lubricating oil by detecting the oil outlet temperature of the oil cooler oil outlet 22 and adjusting the opening of the first control valve 83, thereby avoiding the harmful overheating of the compressor suction port 31 caused by the return of the lubricating oil, reducing the suction specific volume of the compressor 30, and thus improving the cooling capacity of the air-conditioning system.

[0105] Optionally, the control method further includes the following steps:

[0106] S21 , detecting the brine temperature at the heat dissipation unit brine outlet 52 of the heat dissipation unit 50 .

[0107] S22, controlling the opening of the third control valve 85 according to the brine temperature, so that the brine temperature is within a preset brine temperature range.

[0108] In this step, the second temperature detection unit 82 detects the coolant temperature of the coolant outlet 52 of the heat dissipation unit, and the controller controls the opening of the third control valve 85 according to the coolant temperature so that the coolant temperature is within the preset coolant temperature range.

[0109] Furthermore, the brine temperature detected by the second temperature detection unit 82 is T2, and the controller compares T2 with a preset brine temperature range. The two end points in the preset brine temperature range are: brine target temperature + brine deviation value, brine target temperature - brine deviation value.

[0110] When T2>the brine target temperature+the brine deviation value, the controller increases the opening of the third control valve 85 .

[0111] When the brine target temperature+the brine deviation value≥T2≥the brine target temperature−the brine deviation value, the opening degree of the third control valve 85 is maintained unchanged.

[0112] When the brine target temperature minus the brine deviation value>T2, the controller reduces the opening of the third control valve 85.

[0113] The control method of the air-conditioning system of the embodiment of the present application can realize cooling of the driver of the variable frequency motor or the intelligent power module on the drive board by the heat dissipation unit 50 by detecting the refrigerant temperature of the refrigerant outlet 52 of the heat dissipation unit and adjusting the opening of the third control valve 85, thereby reducing the problem of poor heat dissipation of electronic components when the variable frequency motor runs at high frequency, reducing failures and improving the stability of system operation.

[0114] Optionally, the control method further includes the following steps:

[0115] S31 , detecting the oil outlet temperature of the oil cooler oil outlet 22 , the coolant temperature of the coolant outlet 52 of the heat dissipation unit, the opening of the first control valve 83 , the opening of the third control valve 85 and the operating frequency of the variable frequency water pump 60 .

[0116] In this step, the first temperature detection unit 81 detects the oil outlet temperature of the oil cooler outlet 22, the second temperature detection unit 82 detects the coolant temperature of the coolant outlet 52 of the heat dissipation unit, and the controller respectively obtains the opening degree of the first control valve 83, the opening degree of the third control valve 85 and the operating frequency of the variable frequency water pump 60.

[0117] S32, according to the oil outlet temperature, the coolant temperature, the opening of the first control valve 83, the opening of the third control valve 85, and the operating frequency of the variable frequency water pump 60, adjust the opening of the third control valve 85, or adjust the operating frequency of the variable frequency water pump 60.

[0118] In this step, the controller comprehensively adjusts the opening of the third control valve 85 or the operating frequency of the variable frequency water pump 60 according to the oil outlet temperature, the coolant temperature, the opening of the first control valve 83, the opening of the third control valve 85, and the operating frequency of the variable frequency water pump 60, so that the oil temperature is within the preset oil temperature range and the coolant temperature is within the preset coolant temperature range.

[0119] Optionally, in order to facilitate the control of the first control valve 83, the third control valve 85 and the variable frequency water pump 60, there is a control priority. The priority of the opening adjustment of the first control valve 83, the operating frequency adjustment of the variable frequency water pump 60, and the opening adjustment of the third control valve 85 decreases in sequence.

[0120] Optionally, in the step of adjusting the opening of the third control valve 85 or adjusting the operating frequency of the variable frequency water pump 60 according to the oil outlet temperature, the coolant temperature, the opening of the first control valve 83, the opening of the third control valve 85, and the operating frequency of the variable frequency water pump 60, the following steps are also included:

[0121] S321, when the opening degree of the first control valve 83 is 100%, the frequency of the variable frequency water pump 60 is controlled according to the outlet oil temperature.

[0122] In this step, when the opening degree of the first control valve 83 is 100%, the variable frequency water pump 60 increases or decreases the frequency according to a preset control program, and at the same time detects the oil temperature T1 in real time.

[0123] When T1>lubricating oil target temperature+oil temperature deviation value, the controller increases the frequency of the variable frequency water pump 60 .

[0124] When the lubricating oil target temperature+the oil temperature deviation value≥T1≥the lubricating oil target temperature−the oil temperature deviation value, the frequency of the variable frequency water pump 60 remains unchanged.

[0125] When the lubricating oil target temperature minus the oil temperature deviation value> T1, the controller reduces the frequency of the variable frequency water pump 60.

[0126] S322, when the opening of the first control valve 83 is 100%, the operating frequency of the variable frequency water pump 60 is greater than or equal to the preset frequency, and the brine temperature exceeds the preset brine temperature range, increase the opening of the third control valve 85.

[0127] In this step, when the opening of the first control valve 83 is 100% and the operating frequency of the variable frequency water pump 60 is greater than or equal to the preset frequency (the preset frequency is set according to the use requirements, and the embodiment of the present application does not specifically limit this, for example, the preset frequency is 75% of the full frequency), when it is detected that T2>the target temperature of the coolant+the deviation value of the coolant, the controller adjusts the opening of the third control valve 85 to adjust the coolant temperature T2. The adjustment method can refer to the opening adjustment method of the third control valve 85 mentioned above, and the embodiment itself will not be repeated.

[0128] S323, when the opening degree of the first control valve 83 is 100% and the opening degree of the third control valve 85 is 100%, the frequency of the variable frequency water pump 60 is controlled according to the brine temperature.

[0129] In this step, when the opening of the first control valve 83 is 100% and the opening of the third control valve 85 is 100%, if T2>refrigerant target temperature+refrigerant deviation value is still detected, the variable frequency water pump 60 increases or decreases the frequency according to the pre-set control program, and detects the oil temperature T2 in real time.

[0130] When T2>the brine target temperature+the brine deviation value, the controller increases the frequency of the variable frequency water pump 60 .

[0131] When the brine target temperature+the brine deviation value≥T2≥the brine target temperature−the brine deviation value, the frequency of the variable frequency water pump 60 remains unchanged.

[0132] When the brine target temperature minus the brine deviation value>T2, the controller reduces the frequency of the variable frequency water pump 60.

[0133] The control method of the air conditioning system of the embodiment of the present application can reduce the return oil temperature of the lubricating oil by detecting the oil outlet temperature of the oil cooler oil outlet 22, the refrigerant temperature of the refrigerant outlet 52 of the heat dissipation unit, the opening of the first control valve 83, the opening of the third control valve 85 and the operating frequency of the variable frequency water pump 60, and by adjusting the opening of the first control valve 83, the opening of the third control valve 85 and the operating frequency of the variable frequency water pump 60, so as to avoid the harmful overheating of the compressor suction port 31 caused by the return of the lubricating oil, reduce the suction volume of the compressor 30, and thus improve the cooling capacity of the air conditioning system. It can also enable the heat dissipation unit 50 to cool the intelligent power module on the driver or drive board of the variable frequency motor, reduce the problem of poor heat dissipation of electronic components when the variable frequency motor is running at high frequency, reduce failures, and improve the stability of system operation.

[0134] It should be noted that, for the method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present application.

[0135] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0136] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the utility model in essence or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for a terminal (which can be a mobile phone, computer, server, air conditioner, or network equipment, etc.) to execute the methods described in each embodiment of the utility model.

[0137] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises an oil separator (10), an oil cooler (20), a compressor (30), an evaporator (40), a chilled water supply pipeline (91), a chilled water return pipeline (92), a first pipeline (93) and a first control valve (83); The oil separator oil outlet (11) of the oil separator (10) is connected to the oil cooler oil inlet (21) of the oil cooler (20), and the oil cooler oil outlet (22) of the oil cooler (20) is connected to the compressor air intake (31) of the compressor (30); The evaporator coolant inlet (41) of the evaporator (40) is connected to the chilled water return pipeline (92), and the evaporator coolant outlet (42) of the evaporator (40) is connected to the chilled water supply pipeline (91); One end of the first pipeline (93) is connected to the chilled water return pipeline (92) or the chilled water supply pipeline (91), and the other end of the first pipeline (93) is connected to the oil cooler coolant inlet (23) of the oil cooler (20); The first control valve (83) is arranged on the first pipeline (93).

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a first temperature detection unit (81) and a controller, wherein the first temperature detection unit (81) is connected to the oil outlet (22) of the oil cooler; The controller is connected to the first temperature detection unit (81) and the first control valve (83) respectively, and is used to adjust the opening of the first control valve (83) according to the oil outlet temperature of the oil cooler oil outlet (22) detected by the first temperature detection unit (81).

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a second pipeline (94) and a flow regulating unit (86); the oil separator oil outlet (11) and the oil cooler oil inlet (21) are connected via the second pipeline (94); The flow regulating unit (86) is connected to the second pipeline (94), and the flow regulating unit (86) is used to regulate the flow in the second pipeline (94).

4. The air conditioning system according to claim 3, characterized in that: The flow regulating unit (86) is at least one of a capillary tube (87) and a second control valve (84).

5. The air conditioning system according to claim 2, characterized in that: The air conditioning system further comprises a third pipeline (95), a heat dissipation unit (50), a third control valve (85) and an intelligent power module; One end of the third pipeline (95) is connected to the chilled water return pipeline (92) or the chilled water supply pipeline (91), and the other end of the third pipeline (95) is connected to the heat dissipation unit refrigerant inlet (51) of the heat dissipation unit (50); The third control valve (85) is arranged on the third pipeline (95); The heat dissipation unit (50) is connected to the intelligent power module and is used to dissipate heat from the intelligent power module.

6. The air conditioning system according to claim 5, characterized in that: The air conditioning system further comprises a second temperature detection unit (82), wherein the second temperature detection unit (82) is connected to a heat dissipation unit refrigerant outlet (52) of the heat dissipation unit (50); The controller is connected to the second temperature detection unit (82) and the third control valve (85) respectively, and is used to adjust the opening of the third control valve (85) according to the refrigerant temperature of the refrigerant outlet (52) of the heat dissipation unit detected by the second temperature detection unit (82).

7. The air conditioning system according to claim 6, characterized in that: The oil cooler coolant outlet (24) of the oil cooler (20) is connected to the heat dissipation unit coolant inlet (51).

8. The air conditioning system according to claim 6, characterized in that: The air conditioning system further comprises a variable frequency water pump (60), the variable frequency water pump (60) being connected to the third pipeline (95), and the variable frequency water pump water inlet (61) of the variable frequency water pump (60) being respectively connected to the third control valve water outlet of the third control valve (85) and the oil cooler coolant outlet (24) of the oil cooler (20); The controller is connected to the variable frequency water pump (60), and is used to adjust the operating frequency of the variable frequency water pump (60) according to the oil outlet temperature of the oil cooler oil outlet (22) detected by the first temperature detection unit (81), the coolant temperature of the coolant outlet (52) of the heat dissipation unit detected by the second temperature detection unit (82), the opening degree of the first control valve (83), and the opening degree of the third control valve (85).

9. The air conditioning system according to claim 1, characterized in that: The oil cooler (20) is one of a shell-and-tube heat exchanger, a plate heat exchanger, and a shell-and-tube heat exchanger; or the evaporator (40) is one of a shell-and-tube heat exchanger, a plate heat exchanger, and a shell-and-tube heat exchanger.

10. The air conditioning system according to claim 5, characterized in that: The first control valve (83) is a stepless regulating valve; and / or the third control valve (85) is a stepless regulating valve.

Images