Air conditioning unit

Abstract

An air conditioning unit includes a pressure module, a deposition module, and an oil return module in fluid communication. The air conditioning unit further comprises an injection assembly, and the injection assembly comprises an inlet pipeline, a discharge pipeline and a lead-in pipeline. The inlet pipeline is connected to the pressure module. The discharge pipeline is connected to the oil return module or the deposition module. The lead-in pipeline is connected to the deposition module. The injection assembly is used for guiding the liquid refrigerant and lubricating oil mixture deposited in the deposition module to the oil return module. According to the air conditioning unit, through the arrangement of the injection assembly, the oil return efficiency and the operation efficiency of the air conditioning unit are effectively improved. Besides, the injection assembly adopts a refrigerant operated by a self-contained component in the air conditioning unit as a working fluid, other elements do not need to be additionally arranged, the injection assembly is simple in structure, compact in pipeline and easy to install, high reliability during operation is achieved, production cost and use cost are reduced, and the service life of the air conditioning unit is prolonged. And meanwhile, the application range of the air conditioning unit is effectively widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration and air conditioning, and in particular to an air conditioning unit. BACKGROUND

[0002] In an air conditioning unit system, a compressor is a necessary main component. During the operation of the unit, the compressor will be mechanically operated for a long time, so it is necessary to inject lubricating oil into the compressor to provide lubrication for the compressor bearings to maintain the operating efficiency of the compressor, avoid generating large mechanical friction, and thus increase the power consumption of the compressor and reduce the compression efficiency. However, during the operation of the unit, the refrigerant will mix a small amount of lubricating oil to form a mixture that enters the pipeline system of the unit. The liquid refrigerant evaporates into steam in the evaporator, and the lubricating oil will be enriched at the bottom of the evaporator. A higher oil concentration will cause the heat transfer performance of the heat transfer tubes in the evaporator to decrease, and may cause insufficient lubricating oil flow in the compressor. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an air conditioning unit to solve some or all of the deficiencies in the related art.

[0004] The present application provides an air conditioning unit, which comprises a pressure module, a deposition module and an oil return module in fluid communication. The air conditioning unit further comprises an ejector assembly. The ejector assembly comprises an inlet pipeline, an outlet pipeline and an introduction pipeline. The inlet pipeline is connected to the pressure module. The outlet pipeline is connected to the oil return module and the deposition module. The introduction pipeline is connected to the deposition module. The ejector assembly is used to guide the liquid refrigerant and lubricating oil mixture deposited in the deposition module to the oil return module.

[0005] Optionally, the pressure module comprises a condenser and an economizer. The ejector assembly comprises a first valve and a second valve. The first valve is arranged in the inlet pipeline connecting the ejector assembly and the condenser. The second valve is arranged in the inlet pipeline connecting the ejector assembly and the economizer.

[0006] Optionally, the deposition module comprises an evaporator. The air conditioning unit further comprises a control module and a sensor. The control module is electrically connected to the first valve, the second valve and the sensor, respectively. The sensor is used to detect the internal temperature or pressure of the condenser, the economizer and the evaporator, and feed back the detection information to the control module. The control module is used to control the opening and closing of the first valve and the second valve according to the detection information.

[0007] Optionally, when the sensor detects that the internal pressure ratio of the condenser and the evaporator increases and exceeds a standard threshold value, the control module controls the first valve to be closed and the second valve to be opened.

[0008] When the sensor detects that the internal pressure ratio of the condenser and the evaporator decreases and is lower than a standard threshold, the control module controls the first valve to open and the second valve to close.

[0009] Optionally, the deposition module comprises an evaporator. The pressure module comprises a condenser and an economizer. The ejector assembly comprises a three-way valve. The three-way valve is arranged in the inlet pipeline, and two inlets of the three-way valve are connected to the condenser and the economizer respectively.

[0010] Optionally, the air conditioning unit further comprises a control module and a sensor. The control module is electrically connected to the three-way valve and the sensor respectively. The sensor is used to detect the internal temperature or pressure of the condenser, the economizer and the evaporator, and feed back the detection information to the control module. The control module is used to control the communication state of the three-way valve according to the detection information.

[0011] Optionally, when the sensor detects that the internal pressure ratio of the condenser and the evaporator increases and exceeds a standard threshold, the control module controls the three-way valve to communicate the economizer with the inlet pipeline.

[0012] When the sensor detects that the internal pressure ratio of the condenser and the evaporator decreases and is lower than a standard threshold, the control module controls the three-way valve to communicate the condenser with the inlet pipeline.

[0013] Optionally, the deposition module comprises a compressor and an evaporator. The ejector assembly further comprises a first ejector. The introduction end of the first ejector communicates with the compressor, and the discharge end communicates with the evaporator. When the air conditioning unit is in a working state, the first ejector ejects the refrigerant and oil mixture deposited in the compressor into the evaporator. And / or, the deposition module comprises an evaporator. The ejector assembly further comprises a second ejector. The introduction end of the second ejector communicates with the evaporator, and the discharge end communicates with the oil return module. When the air conditioning unit is in a working state, the second ejector ejects the liquid refrigerant and lubricating oil mixture deposited in the evaporator into the oil return module.

[0014] Optionally, the introduction end of the first ejector is connected to the suction bottom of the compressor; and / or, the introduction end of the second ejector is connected to the bottom of the shell of the evaporator.

[0015] Optionally, the air conditioning unit further comprises a control module. The ejector assembly further comprises a third valve, which is arranged in the introduction pipeline between the first ejector and the compressor. The control module is electrically connected to the third valve and is configured to control opening and closing of the third valve. And / or, the air conditioning unit further comprises a control module. The ejector assembly further comprises a fourth valve, which is arranged in the introduction pipeline between the second ejector and the evaporator. The control module is electrically connected to the fourth valve and is configured to control opening and closing of the fourth valve.

[0016] The technical scheme provided by the embodiment of the present application can include the following beneficial effects:

[0017] As can be seen from the above embodiment, the air conditioning unit provided by the present application can suck the liquid refrigerant and lubricating oil mixture deposited in the deposition module through the arrangement of the ejector assembly, and discharge the mixture from the discharge pipeline to the oil return module through the working fluid from the pressure module, and then guide the lubricating oil back to the compressor to be lubricated. It can be seen that the arrangement of the ejector assembly effectively improves the oil return efficiency and operating efficiency of the air conditioning unit. In addition, the ejector assembly uses the refrigerant operated by the components in the air conditioning unit as the working fluid, without the need to separately add other elements, and the structure of the ejector assembly is simple, the pipeline is compact, and easy to install, not only realizing high reliability during operation, but also reducing production cost and use cost, and effectively improving the application range of the air conditioning unit.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a structural diagram of an air conditioning unit in an embodiment of the present application;

[0021] Figure 2 is a structural diagram of an air conditioning unit in another embodiment of the present application.

[0022] Explanation of reference signs:

[0023] 100. Air conditioning unit; 11. Pressure module; 111. Condenser; 112. Economizer; 12. Deposition module; 121. Compressor; 122. Evaporator; 13. Oil return module; 131. Oil tank; 132. Return valve; 14. Ejector assembly; 141. Inlet pipe; 142. Discharge pipe; 143. Inlet pipe; 144a. First valve; 144b. Second valve; 144c. Third valve; 144d. Fourth valve; 145. Three-way valve; 146. First ejector; 147. Second ejector; 15. First expansion device; 16. Second expansion device. Detailed Implementation

[0024] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0025] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0026] like Figure 1 and Figure 2 As shown, this application provides an air conditioning unit 100, including a pressure module 11, a deposition module 12, and an oil return module 13 in fluid communication. The air conditioning unit 100 also includes an ejector assembly 14. The ejector assembly 14 includes an inlet pipe 141, a discharge pipe 142, and an inlet pipe 143. In the figure, for ease of identification, the inlet pipe 141 is shown in red, the discharge pipe 142 in green, and the inlet pipe 143 in blue. The inlet pipe 141 is connected to the pressure module 11. The discharge pipe 142 is connected to the deposition module 12 and the oil return module 13. The inlet pipe 143 is connected to the deposition module 12. The ejector assembly 14 is used to guide the liquid refrigerant and lubricating oil mixture deposited in the deposition module 12 to the oil return module 13.

[0027] The ejector assembly 14 in the air conditioning unit 100 can suck the refrigerant and lubricating oil mixture deposited in the deposition module 12 and discharge the mixture from the discharge pipeline 142 to the oil return module 13 through the working fluid from the pressure module 11, thereby guiding the lubricating oil back to the compressor to be lubricated. It can be seen that the arrangement of the ejector assembly 14 effectively improves the oil return efficiency and operating efficiency of the air conditioning unit 100. In addition, the ejector assembly 14 uses the fluid discharged by the components in the air conditioning unit 100 as working fluid, without the need for additional elements, and the structure of the ejector assembly 14 is simple, the pipeline is compact, and easy to install, not only realizing high reliability during operation, but also reducing production and use costs, while effectively improving the application range of the air conditioning unit 100.

[0028] In an optional embodiment, the pressure module 11 includes a condenser 111 and an economizer 112. The ejector assembly 14 includes a first valve 144a and a second valve 144b. The first valve 144a is arranged at the inlet pipeline 141 connecting the ejector assembly 14 and the condenser 111. The second valve 144b is arranged at the inlet pipeline 141 connecting the ejector assembly 14 and the economizer 112.

[0029] During actual operation of the unit, the working pressure of the condenser 111 is relatively high, so using the condenser 111 as the power fluid source of the ejector assembly 14 can maintain the ejecting efficiency of the ejector assembly 14. However, in some specific working conditions, for example, when the working pressure in the condenser 111 is too high, it may cause the ejector assembly 14 to suck insufficient amount of mixture from the inlet pipeline 143, or even cause the ejector assembly 14 to fail.

[0030] In the air conditioning unit 100 of the present application, the inlet pipeline 141 is connected to the condenser 111 and the economizer 112, and the opening and closing of the pipeline are controlled by the first valve 144a and the second valve 144b, so that the ejector assembly 14 of the air conditioning unit 100 can select one of the condenser 111 and the economizer 112 as the power fluid source. Specifically, when the working pressure in the condenser 111 is too high, the air conditioning unit 100 can use the economizer 112 as the power fluid source of the ejector assembly 14 by disconnecting the first valve 144a and connecting the second valve 144b, and use the pressure fluid in the economizer 112 to inject the mixture into the oil return module 13. It can be seen that the air conditioning unit 100 of the present application can still obtain sufficient oil return amount under the high pressure head operating condition of the condenser 111 through simple structure and pipeline arrangement, thereby ensuring the oil return efficiency and operating efficiency of the air conditioning unit 100, further improving the reliability and safety of the air conditioning unit 100, and effectively expanding the application range of the air conditioning unit 100.

[0031] In an optional embodiment, the air conditioning unit 100 further comprises a control module and a sensor (not shown in the figure). The control module is electrically connected to the first valve 144a, the second valve 144b and the sensor respectively. The sensor is used to detect the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and feed back the detection information to the control module. The control module is used to control the opening and closing of the first valve 144a and the second valve 144b according to the detection information.

[0032] By setting the control module and the sensor, the air conditioning unit 100 can automatically detect the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and calculate the internal pressure ratio of the condenser 111 and the evaporator 122 based on the temperature information, the pressure information or the pressure ratio information, and control the first valve 144a and the second valve 144b, thereby effectively improving the autonomy and practicality of the air conditioning unit 100, and ensuring the convenience of the air conditioning unit 100 during use and the user experience.

[0033] It is worth mentioning that in the optional embodiments described above, according to different working scenarios and actual needs of users, temperature sensors or pressure sensors can be arranged at corresponding positions inside the condenser 111, the economizer 112 and the evaporator 122. When temperature sensors are arranged, the pressure values can be converted by detecting the internal refrigerant saturation temperature of the condenser 111, the economizer 112 and the evaporator 122. When pressure sensors are arranged, the internal pressure information of the condenser 111, the economizer 112 and the evaporator 122 can be directly detected, and the pressure ratio can be calculated. Therefore, the present application does not limit this.

[0034] In an optional embodiment, when the sensor detects the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and the control module calculates that the internal pressure ratio of the condenser 111 and the evaporator 122 increases and exceeds the standard threshold, the control module controls the first valve 144a to close and controls the second valve 144b to open.

[0035] When the sensor detects the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and the control module calculates that the internal pressure ratio of the condenser 111 and the evaporator 122 decreases and is lower than the standard threshold, the control module controls the first valve 144a to open and controls the second valve 144b to close.

[0036] Specifically, the air conditioning unit 100 is preset with a standard threshold X in the control module, and the specific value of the standard threshold X can be set according to the actual unit structure, working condition, etc., and the present application does not limit this. In the running process of the air conditioning unit 100, the sensor detects the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and sends the temperature or pressure information to the control module. The control module calculates the internal pressure ratio Y of the condenser 111 and the evaporator 122 according to the detection information, and compares the size of the standard threshold X and the actual pressure ratio Y. If the actual pressure ratio Y is lower than the standard threshold X, it proves that the working pressure head of the condenser 111 does not appear too high, so the condenser 111 can be selected as the power fluid source, that is, the first valve 1#144a is opened and the second valve 144b is closed. On the contrary, if the actual pressure ratio Y is higher than the standard threshold X, it proves that the working pressure head of the condenser 111 is too high, and if the condenser 111 continues to be selected as the power fluid source, the oil return flow may be insufficient or even fail, therefore, the power fluid source needs to be switched to the economizer 112, and the steam of the economizer 112 is used as the working fluid of the injection assembly 14, that is, the first valve 144a is closed and the second valve 144b is opened.

[0037] Of course, in some other optional embodiments, the scheme of comparing the standard threshold X and the pressure ratio Y as described herein can not be used, but the detected temperature and the standard threshold can be directly compared, or the pressure and the standard threshold can be directly compared. The present application does not limit this.

[0038] As can be seen, the air conditioning unit 100 of the present application has the characteristics of high autonomy and high intelligence, can autonomously detect, judge and execute, ensures the reliability and practicality of the air conditioning unit 100, improves the oil return efficiency and working efficiency, and improves the convenience and use experience of the user in the use process.

[0039] In optional embodiments, as shown in Figure 2 The injection assembly 14 includes a three-way valve 145. The three-way valve 145 is arranged in the inlet pipe 141, and two inlets of the three-way valve 145 are connected to the condenser 111 and the economizer 112, respectively.

[0040] Similar to the embodiments described above, Figure 1 As shown in Figure 2In the shown embodiment, the air conditioning unit 100 is provided with a three-way valve 145 on the inlet pipeline 141, and two inlets of the three-way valve 145 are connected to the condenser 111 and the economizer 112 respectively, so that the selection of the power fluid source can be realized by controlling the pipeline connection of the three-way valve 145. Specifically, when the above-mentioned situation of the working pressure in the condenser 111 being too high occurs, it is necessary to suspend the use of the condenser 111 as the working fluid source and instead select the economizer 112, at which time the air conditioning unit 100 can change the connection pipeline of the three-way valve 145 so that the economizer 112 is connected to the injection assembly 14. It can be seen that the pipeline arrangement of the air conditioning unit 100 in the embodiment further simplifies the overall structure and improves the convenience in inspection, maintenance and other processes, thereby effectively improving the practicality of the air conditioning unit 100, reducing the production, installation and use costs, and further expanding the application range of the air conditioning unit 100.

[0041] In an optional embodiment, the control module can control the connection state of the three-way valve 145 according to the pressure information.

[0042] The air conditioning unit 100 is provided with a control module and a sensor, so that the unit can automatically detect the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, calculate the internal pressure ratio of the condenser 111 and the evaporator 122, and control the three-way valve 145 through these information, effectively improving the autonomy and practicality of the air conditioning unit 100, and also ensuring the convenience of the air conditioning unit 100 in use and guaranteeing the user experience.

[0043] When the pressure sensor detects the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and the control module calculates that the internal pressure ratio of the condenser 111 and the evaporator 122 increases and exceeds the standard threshold, the control module controls the three-way valve 145 to connect the economizer 112 to the inlet pipeline 141.

[0044] When the sensor detects the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and the control module calculates that the internal pressure ratio of the condenser 111 and the evaporator 122 decreases and is lower than the standard threshold, the control module controls the three-way valve 145 to connect the condenser 111 to the inlet pipeline 141.

[0045] With Figure 1The illustrated embodiment is similar, the air conditioning unit 100 is preset with a standard threshold X in the control module, during the operation of the air conditioning unit 100, the sensor detects the internal temperature or pressure of the condenser 111, the economizer 112 and the evaporator 122, and sends the temperature or pressure information to the control module, the control module calculates the internal pressure ratio Y of the condenser 111 and the evaporator 122, and compares the size of the standard threshold X and the actual pressure ratio Y, if the actual pressure ratio Y is lower than the standard threshold X, it indicates that the working pressure head of the condenser 111 does not appear too high, therefore, the condenser 111 can be selected as the power fluid source, at this time, the control module will control the valve rod inside the three-way valve 145 to move, thereby connecting the condenser 111 and the injection assembly 14, and disconnecting the economizer 112 and the injection assembly 14. On the contrary, if the actual pressure ratio Y is higher than the standard threshold X, it indicates that the working pressure head of the condenser 111 is too high, if the condenser 111 is continued to be selected as the power fluid source, the oil return flow may be insufficient or even fail, therefore, the power fluid source needs to be switched to the economizer 112, and the steam of the economizer 112 is used as the working fluid of the injection assembly 14, at this time, the control module will control the valve rod inside the three-way valve 145 to move in the opposite direction, thereby disconnecting the condenser 111 and the injection assembly 14, and connecting the economizer 112 and the injection assembly 14.

[0046] In actual application scenarios, according to different functions, structures and other characteristics of the air conditioning unit 100, the specific components corresponding to the deposition module 12 may be different. For example: in some four-pipe heat pump units, the deposition module 12 that produces the deposition of the liquid refrigerant and lubricating oil mixture may be one or more of the evaporator 122, the compressor 121, the plate heat exchanger, the fin heat exchanger and the like; and in some other structure units, the deposition module 12 that produces the deposition of the liquid refrigerant and lubricating oil mixture may only include the compressor 121 or only include the evaporator 122. Therefore, according to different structures of the unit, the connection mode of the injection assembly 14 may be different, and the present application does not limit this, but it should be pointed out that the scheme for improving the oil return flow in different structures of the unit using the mode described in the present application should be included in the scope protected by the present application.

[0047] In the case of Figure 1 and Figure 2In the shown embodiment, the deposition module 12 comprises a compressor 121 and an evaporator 122. The injection assembly 14 further comprises a first ejector 146 and a second ejector 147. The first ejector 146 has a suction end in communication with the compressor 121 and a discharge end in communication with the evaporator 122. When the air conditioning unit 100 is in operation, the first ejector 146 injects the refrigerant and lubricant mixture deposited in the compressor 121 into the evaporator 122. The second ejector 147 has a suction end in communication with the evaporator 122 and a discharge end in communication with the oil return module 13. When the air conditioning unit 100 is in operation, the second ejector 147 injects the refrigerant and lubricant mixture deposited in the evaporator 122 into the oil return module 13.

[0048] In actual operation, the injection assembly 14 sucks the refrigerant and lubricant mixture deposited in the compressor 121 through the first ejector 146 and discharges the refrigerant and lubricant mixture through the discharge end into the evaporator 122. The second ejector 147 sucks the refrigerant and lubricant mixture in the evaporator 122 and discharges it into the oil return module 13, which is finally pumped into the compressor 121 for bearing lubrication. Specifically, in the air conditioning unit 100 of the present application, the oil tank 131 is used as the refrigerant and lubricant mixture collecting device of the oil return module 13. A refrigerant pipeline is arranged on the top of the oil tank 131 and connected to the evaporator 122. A return valve 132 electrically connected to the control module is arranged in the refrigerant pipeline. The mixture injected from the evaporator 122 by the second ejector 147 is actually a mixture of refrigerant and lubricant. After the mixture is discharged into the oil tank 131, the refrigerant liquid absorbs heat and evaporates into refrigerant vapor. At this time, the control module opens the return valve 132, so that the refrigerant vapor flows back into the evaporator 122 through the return valve 132, thereby entering the pipeline system of the unit and continuing to work. The remaining lubricant is pumped into the compressor 121 by the oil pump of the oil tank 131, thereby returning to the compressor 121 for bearing lubrication.

[0049] As described above, in different unit structures, the deposition module 12 is not the same, and therefore the number and connection position of the ejectors are also different. For example, in a unit that only needs to inject the evaporator 122, only the second ejector 147 described above can be included. Or in a unit that needs to inject the heat exchanger, more ejectors are arranged, and the like. Therefore, the present application does not limit this.

[0050] In the embodiment disclosed in the present application, the suction end of the first ejector 146 is connected to the suction bottom of the compressor 121, and the suction end of the second ejector 147 is connected to the bottom of the shell of the evaporator 122.

[0051] During the operation of the air conditioning unit, the bearing lubricating oil of the compressor 121 can mix into the refrigerant vapor flowing through the circulation pipeline. The mixture containing the lubricating oil enters the condenser 111 and exchanges heat in the heat transfer pipes of the condenser 111 to condense into a mixed liquid. The mixed liquid enters the economizer 112 through the first expansion device 15, part of the mixed liquid is flashed into vapor and enters the middle suction port of the compressor 121 for the next stage of compression, and the remaining mixed liquid is discharged from the economizer 112, depressurized by the second expansion device 16, and enters the evaporator 122. In the evaporator 122, the liquid refrigerant is evaporated into vapor and absorbs heat through the heat transfer pipes to form a cooling liquid with a lower temperature for cooling applications of the air conditioning system. In this process, the first ejector 146 can inject the refrigerant and lubricating oil mixture deposited at the bottom of the suction port of the compressor 121 into the evaporator 122, and the second ejector 147 can inject the refrigerant and lubricating oil mixture originally deposited in the evaporator 122 and the refrigerant and lubricating oil mixture injected from the compressor 121 into the oil tank 131 together, and finally pump the lubricating oil into the compressor 121 to complete the oil return cycle of the air conditioning unit 100.

[0052] Of course, in the embodiment in which the ejector assembly described above is connected only to the evaporator 122, the introduction end of the second ejector 147 can be connected to the bottom of the shell of the evaporator 122, or in other embodiments including heat exchangers and other components, more ejectors can be provided to connect these components. Therefore, the present application does not limit this.

[0053] In optional embodiments, since the ejector assembly 14 described in the present application includes the first ejector 146 and the second ejector 147, the ejector assembly 14 is further provided with a third valve 144c and a fourth valve 144d which are both electrically connected to the control module. The third valve 144c is provided in the introduction pipeline 143 between the first ejector 146 and the compressor 121. The fourth valve 144d is provided in the introduction pipeline 143 between the second ejector 147 and the evaporator 122.

[0054] As described above, the first valve 144a and the second valve 144b are provided to select one of the condenser 111 and the economizer 112 as the working fluid source. Similarly, the third valve 144c and the fourth valve 144d are provided to better control the working selection of the first ejector 146 and the second ejector 147. Specifically, according to the actual working condition, the air conditioning unit 100 can control the opening degree of the third valve 144c by the control module, and the opening degree of the fourth valve 144d by the control module.

[0055] It should be noted that the first valve 144a, the second valve 144b, the third valve 144c and the fourth valve 144d described in the present application are all solenoid valves, so that the control module can directly control the valves, thereby improving the overall response speed, intelligent effect and the like of the air conditioning unit 100. In other optional embodiments, according to actual working conditions and use requirements, manual valves can also be used as the first valve 144a, the second valve 144b, the third valve 144c and the fourth valve 144d, or some manual valves and some solenoid valves can be used. Therefore, the present application does not limit this.

[0056] In addition, as described above, the overall structure of the air conditioning unit 100 is different in different embodiments, so the structure of the ejector assembly 14 will also change, that is, the number and installation position of the valves can also change, for example, a fifth valve is arranged between the plate heat exchanger and the ejector, or a sixth valve is arranged between the fin heat exchanger and the ejector, etc. Therefore, the present application does not limit this.

[0057] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structure described in the above embodiments and shown in the accompanying drawings; any modification, equivalent replacement, improvement and the like made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An air conditioning unit, characterized in that, The air conditioning unit includes a connected pressure module, a deposition module, and an oil return module; the air conditioning unit also includes: An ejector assembly includes an inlet pipe, a outlet pipe, and an inlet pipe; the inlet pipe is connected to the pressure module; the outlet pipe is connected to the oil return module and the deposition module; the inlet pipe is connected to the deposition module; the ejector assembly is used to guide the liquid refrigerant and lubricating oil mixture deposited in the deposition module to the oil return module.

2. The air conditioning unit as described in claim 1, characterized in that, The pressure module includes a condenser and an economizer; the ejector assembly includes a first valve and a second valve; wherein the first valve is disposed in the inlet pipe connecting the ejector assembly and the condenser; and the second valve is disposed in the inlet pipe connecting the ejector assembly and the economizer.

3. The air conditioning unit as described in claim 2, characterized in that, The deposition module includes an evaporator; the air conditioning unit also includes a control module and a sensor; the control module is electrically connected to the first valve, the second valve and the sensor respectively; the sensor is used to detect the internal temperature or pressure of the condenser, the economizer and the evaporator, and to feed back the detection information to the control module; the control module is used to control the opening and closing of the first valve and the second valve according to the detection information.

4. The air conditioning unit as described in claim 3, characterized in that, When the sensor detects that the internal pressure ratio between the condenser and the evaporator has increased and exceeded a standard threshold, the control module controls the first valve to close and the second valve to open. When the sensor detects that the internal pressure ratio of the condenser to the evaporator has decreased and is below a standard threshold, the control module controls the first valve to open and the second valve to close.

5. The air conditioning unit as described in claim 1, characterized in that, The deposition module includes an evaporator; the pressure module includes a condenser and an economizer; the ejector assembly includes a three-way valve; the three-way valve is located in the inlet pipeline, and the two inlets of the three-way valve are respectively connected to the condenser and the economizer.

6. The air conditioning unit as described in claim 5, characterized in that, The air conditioning unit also includes a control module and a sensor; the control module is electrically connected to the three-way valve and the sensor respectively; the sensor is used to detect the internal temperature or pressure of the condenser, economizer and evaporator, and feed the detection information back to the control module; the control module is used to control the connection state of the three-way valve according to the detection information.

7. The air conditioning unit as described in claim 6, characterized in that, When the sensor detects that the internal pressure ratio between the condenser and the evaporator has increased and exceeded the standard threshold, the control module controls the three-way valve to connect the economizer to the inlet pipe; When the sensor detects that the internal pressure ratio of the condenser to the evaporator has decreased and is below a standard threshold, the control module controls the three-way valve to connect the condenser to the inlet pipe.

8. The air conditioning unit as described in claim 1, characterized in that, The deposition module includes a compressor and an evaporator; the ejector assembly further includes a first ejector; the inlet end of the first ejector is connected to the compressor, and the outlet end is connected to the evaporator; when the air conditioning unit is in operation, the first ejector ejects the refrigerant and oil mixture deposited in the compressor into the evaporator; and / or, The deposition module includes an evaporator; the ejector assembly further includes a second ejector; the inlet end of the second ejector is connected to the evaporator, and the outlet end is connected to the oil return module; when the air conditioning unit is in operation, the second ejector ejects the liquid refrigerant and lubricating oil mixture deposited in the evaporator into the oil return module.

9. The air conditioning unit as described in claim 8, characterized in that, The inlet end of the first ejector is connected to the bottom of the compressor's suction; and / or, the inlet end of the second ejector is connected to the bottom of the evaporator's housing.

10. The air conditioning unit as described in claim 8, characterized in that, The air conditioning unit also includes a control module; the ejector assembly also includes a third valve, which is disposed in the inlet pipe between the first ejector and the compressor; the control module is electrically connected to the third valve and is used to control the opening and closing of the third valve; And / or, the air conditioning unit further includes a control module; the ejector assembly further includes a fourth valve, the fourth valve being disposed in the inlet pipe between the second ejector and the evaporator; the control module is electrically connected to the fourth valve and is used to control the opening and closing of the fourth valve.

Images