Injection oil return device, water chilling unit oil return system, control method and control device

Abstract

The invention relates to the technical field of water chilling units, and provides an injection oil return device, a water chilling unit oil return system, a control method and a control device.The injection oil return device is of an integrally-formed structure and comprises a pipe body, a first filter, an injection pipe, a second filter and an electromagnetic valve; the pipe body comprises a main pipe and a branch pipe, a receiving chamber and a mixing chamber which are communicated in the axial direction are arranged in the main pipe, the outlet end of the mixing chamber is connected with an air suction port of the compressor, and the branch pipe is communicated with the side portion of the receiving chamber in the radial direction and used for introducing low-pressure oil into the receiving chamber; the first filter is arranged in the branch pipe; a nozzle is arranged at the outlet end of the injection pipe, located in the receiving chamber and used for injecting high-pressure oil into the receiving chamber. The second filter is arranged in the injection pipe; the electromagnetic valve is connected to the inlet end of the injection pipe and used for controlling on-off of an oil way of the injection pipe. The number of system connection point locations can be effectively reduced, the system failure rate is reduced, and therefore the system safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of chillers, and particularly to an ejector oil return device, a chiller oil return system, a control method and a control device. Background Art

[0002] Currently, the oil return system of a chiller returns oil through an oil return pipeline. However, there are many oil return components on the oil return pipeline, and they are respectively connected through multiple sections of pipelines. There are many connection points, and the installation is cumbersome.

[0003] Generally, the exhaust volumes of the screw compressor and centrifugal compressor of a chiller are relatively large. The vibration of the compressor causes relatively large vibration damage to the oil return pipeline. After long-term use, there is a risk of connection point loosening failure. If the design is not good, it is very easy to cause damage to the pipeline components, resulting in system leakage and high safety risks. Summary of the Invention

[0004] The present invention provides an ejector oil return device, a chiller oil return system, a control method and a control device to solve the defects in the related art that the components of the chiller oil return system are numerous, the installation is cumbersome and the failure rate is high, and to realize the integrated modular design of the ejector oil return device, which can achieve rapid installation, effectively reduce the number of system connection points, reduce the system failure rate, and thus ensure the system safety.

[0005] The present invention provides an ejector oil return device. The ejector oil return device is an integrally formed structure, including:

[0006] A pipe body, including a main pipe and a branch pipe. An acceptance chamber and a mixing chamber are axially communicated in the main pipe, and the outlet end of the mixing chamber is connected to the suction port of the compressor. The branch pipe is radially communicated with the side of the acceptance chamber for introducing low-pressure oil into the acceptance chamber.

[0007] A first filter, disposed in the branch pipe;

[0008] An ejector pipe, the outlet end of the ejector pipe is provided with a nozzle, and the nozzle is located in the acceptance chamber for injecting high-pressure oil into the acceptance chamber.

[0009] A second filter, disposed in the ejector pipe;

[0010] An electromagnetic valve, connected to the inlet end of the ejector pipe for controlling the on-off of the oil path of the ejector pipe.

[0011] The ejector oil return device provided by the present invention, on the premise of meeting the use requirements, conducts an integrated modular design, integrates components such as filters, electromagnetic valves, pipe bodies and ejector pipes into an integrated structure, so as to facilitate rapid production, achieve rapid installation, effectively reduce the number of system connection points, reduce the system failure rate, and thus ensure the system safety.

[0012] An ejector oil return device provided by the present invention further includes:

[0013] A flow regulator is disposed at the nozzle for adjusting the flow cross-sectional area of the nozzle to regulate the injection flow rate of the nozzle.

[0014] For the ejector oil return device provided by the present invention, the flow cross-sectional area of the ejector tube nozzle can be adjusted by the flow regulator, and the injection flow rate can be regulated by adjusting the flow cross-sectional area, so as to meet the usage requirements of all models of compressors, effectively improve the applicable range, and can adjust the ejector flow rate in real time according to the system oil return demand during the actual use process, thereby improving the operation stability of the water chiller.

[0015] For an ejector oil return device provided by the present invention, the flow regulator includes:

[0016] A valve plate is located in the receiving chamber and is radially movably disposed at the outlet of the nozzle;

[0017] A driving part is disposed outside the main pipe and is drivingly connected to the valve plate for driving the valve plate to move radially to adjust the opening degree of the outlet of the nozzle.

[0018] For the flow regulator provided by the present invention, by controlling the driving part to drive the valve plate to move radially, the opening degree of the outlet of the nozzle can be adjusted, so as to regulate the injection flow rate of the nozzle and realize the regulation of the oil return amount.

[0019] An ejector oil return device provided by the present invention further includes:

[0020] A first liquid sight glass, which is integrally formed on the branch pipe.

[0021] By integrally forming the first liquid sight glass on the branch pipe, the present invention can further reduce the number of system connection points, reduce the system failure rate, and thus ensure the system safety.

[0022] An ejector oil return device provided by the present invention further includes:

[0023] A second liquid sight glass, which is integrally formed on the ejector pipe.

[0024] By integrally forming the second liquid sight glass on the ejector pipe, the present invention can further reduce the number of system connection points, reduce the system failure rate, and thus ensure the system safety.

[0025] An ejector oil return device provided according to the present invention, a reduced-diameter section is provided in the ejector pipe, and the cross-sectional area of the reduced-diameter section gradually decreases along the direction from the inlet end to the outlet end of the ejector pipe; and the internal flow path of the nozzle is a constant-diameter section, and the constant-diameter section is connected to the reduced-diameter section.

[0026] With such a design, when the ejector pipe injects high-pressure oil into the receiving chamber through the nozzle, due to the entrainment effect of the high-pressure oil, low-pressure oil is entrained into the receiving chamber through the branch pipe, then the two parts of oil are uniformly mixed in the mixing chamber, and then return to the inside of the compressor through the suction port of the compressor to complete the system oil return.

[0027] The present invention also provides a chilled water unit oil return system, including: the above-mentioned ejector oil return device and a compressor, an oil separator, a condenser, an electronic expansion valve and an evaporator that are connected in a cycle, and the ejector oil return device is respectively connected to the compressor, the oil separator and the evaporator.

[0028] The chilled water unit oil return system provided by the present invention, through the above-mentioned integrated ejector oil return device, can achieve rapid installation, effectively reduce the number of system connection points, reduce the system failure rate, and thus ensure the system safety.

[0029] According to a chilled water unit oil return system provided by the present invention, a first angle valve is provided between the ejector oil return device and the oil separator, a second angle valve is provided between the ejector oil return device and the evaporator, and a third angle valve is provided between the ejector oil return device and the compressor.

[0030] By respectively arranging angle valves at three connection ends of the ejector oil return device, the present invention can control the on-off of the oil circuit. When the ejector oil return device needs to be replaced and maintained, the three angle valves can be closed to prevent the leakage of refrigerant and oil, and then disassembly and maintenance can be carried out, without affecting the normal flow of the refrigerant circulation circuit of the system.

[0031] The present invention also provides a control method for the above-mentioned ejector oil return device, including:

[0032] Obtaining the model information of the compressor;

[0033] Determining the oil return demand of the compressor according to the model information of the compressor;

[0034] Controlling the flow regulator to adjust the flow cross-sectional area of the nozzle according to the oil return demand of the compressor.

[0035] The control method of the ejector oil return device provided by the present invention determines the oil return demand of the compressor by obtaining the model information of the compressor, and controls the flow regulator to adjust the flow cross-sectional area of the nozzle according to the oil return demand of the compressor, so that the oil return amount ejected by the ejector oil return device reaches the oil return demand of the compressor and meets the use requirements of the compressor. Therefore, the present invention can adjust the ejector flow rate in real time according to the system oil return demand during actual use to improve the operating stability of the chiller.

[0036] The present invention also provides a control device for the above-mentioned ejector oil return device, including:

[0037] An acquisition module for acquiring the model information of the compressor;

[0038] A determination module for determining the oil return demand of the compressor according to the model information of the compressor;

[0039] A control module for controlling the flow regulator to adjust the flow cross-sectional area of the nozzle according to the oil return demand of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is a schematic structural diagram of the ejector oil return device provided by the present invention;

[0042] Figure 2 is a schematic structural diagram of the oil return system of the chiller provided by the present invention;

[0043] Figure 3 is a schematic flow chart of the control method of the ejector oil return device provided by the present invention;

[0044] Figure 4 is a schematic structural diagram of the control device for the ejector oil return device provided by the present invention.

[0045] Reference Signs:

[0046] 100: Ejector oil return device;

[0047] 101: Pipe body; 1011: Main pipe; 10111: Receiving chamber; 10112: Mixing chamber;

[0048] 1012: Branch pipe; 102: First filter; 103: Ejector pipe; 1031: Nozzle;

[0049] 1032: Reduced diameter section; 1033: Constant diameter section; 104: Second filter; 105: Solenoid valve;

[0050] 106: Flow regulator; 1061: Valve plate; 1062: Driving part;

[0051] 107: First liquid sight glass; 108: Second liquid sight glass;

[0052] 200: Compressor; 201: Oil separator; 202: Condenser; 203: Electronic expansion valve;

[0053] 204: Evaporator; 205: First angle valve; 206: Second angle valve; 207: Third angle valve;

[0054] 208: Drier filter;

[0055] 401: Acquisition module; 402: Determination module; 403: Control module. Detailed implementation mode

[0056] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0057] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0059] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0061] The following is combined with Figures 1-4 Describe the ejector oil return device, the oil return system of the water chiller, the control method, and the control device of the present invention, etc.

[0062] According to the embodiments of the first aspect of the present invention, as shown in Figure 1 The ejector oil return device 100 provided by the present invention is an integrally formed structure, mainly including components such as a pipe body 101, a first filter 102, an ejector pipe 103, a second filter 104, and a solenoid valve 105.

[0063] Among them, the pipe body 101 includes a main pipe 1011 and a branch pipe 1012. The main pipe 1011 is arranged horizontally. An acceptance chamber 10111 and a mixing chamber 10112 are provided in the main pipe 1011 and are axially connected. The outlet end of the mixing chamber 10112 is connected to the suction port of the compressor 200. The branch pipe 1012 is arranged vertically and is radially connected to the side of the acceptance chamber 10111 for introducing low-pressure oil into the acceptance chamber 10111.

[0064] The first filter 102 is arranged in the branch pipe 1012 and is used to filter impurities in the oil path of the branch pipe 1012 to prevent impurities from entering the compressor 200, thereby achieving the purpose of protecting the compressor 200.

[0065] The outlet end of the ejector pipe 103 is provided with a nozzle 1031. The nozzle 1031 is located in the acceptance chamber 10111 and is used to inject high-pressure oil into the acceptance chamber 10111. Moreover, under the entrainment action of the high-pressure oil, the low-pressure oil in the branch pipe 1012 is entrained into the acceptance chamber 10111. Then, the two parts of oil are evenly mixed in the mixing chamber 10112 and then return to the inside of the compressor 200 through the suction port of the compressor 200 to complete the oil return.

[0066] The second filter 104 is arranged in the ejector pipe 103 and is used to filter impurities in the oil path of the ejector pipe 103 to prevent impurities from entering the compressor 200, thereby achieving the purpose of protecting the compressor 200.

[0067] The solenoid valve 105 is connected to the inlet end of the ejector pipe 103 and is used to control the on-off of the oil path of the ejector pipe 103. Specifically, when the compressor 200 starts, the solenoid valve 105 opens for oil return. Correspondingly, when the compressor 200 shuts down, the solenoid valve 105 closes.

[0068] Therefore, the ejector oil return device 100 provided by the embodiment of the present invention is integrally modular designed on the premise of meeting the use requirements. Components such as the filter, the solenoid valve 105, the pipe body 101, and the ejector pipe 103 are integrated into an integral structure, which is convenient for rapid production, realizes rapid installation, effectively reduces the number of system connection points, reduces the system failure rate, and thus ensures the system safety.

[0069] Currently, generally, an ejector with an ejector nozzle aperture matching different models of compressors is used. If the ejector is not properly selected, it is very easy to cause poor oil return in the system, affecting the normal and stable operation of the chiller. If there is a problem, it can only be disassembled and re-selected for installation.

[0070] To solve the above technical problems, refer to Figure 1As shown in the figure, the ejector oil return device 100 provided by the embodiment of the present invention further includes: a flow regulator 106. The flow regulator 106 is arranged at the nozzle 1031 and is used to adjust the flow cross-sectional area of the nozzle 1031 so as to adjust the injection flow rate of the nozzle 1031, thereby adjusting the oil return amount.

[0071] For the ejector oil return device 100 provided by the embodiment of the present invention, the flow cross-sectional area of the nozzle 1031 of the ejector pipe 103 can be adjusted through the flow regulator 106. By adjusting the flow cross-sectional area, the injection flow rate can be adjusted, so as to meet the usage requirements of all models of compressors, effectively improve the applicable range, and can adjust the ejector flow rate in real time according to the system oil return demand during the actual use process, thereby improving the operation stability of the water chiller.

[0072] According to an embodiment of the present invention, the flow regulator 106 includes: a valve plate 1061 and a driving part 1062. The valve plate 1061 is located in the receiving chamber 10111, and the valve plate 1061 is radially movably arranged at the outlet of the nozzle 1031; the driving part 1062 is arranged outside the main pipe 1011, and the driving part 1062 is drivingly connected to the valve plate 1061 and is used to drive the valve plate 1061 to move radially to adjust the opening degree of the outlet of the nozzle 1031.

[0073] For the flow regulator 106 provided by the embodiment of the present invention, by controlling the driving part 1062 to drive the valve plate 1061 to move radially, the opening degree of the outlet of the nozzle 1031 can be adjusted, thereby adjusting the injection flow rate of the nozzle 1031 and realizing the adjustment of the oil return amount.

[0074] For example, when the driving part 1062 controls the valve plate 1061 to move upward, the opening degree of the outlet of the nozzle 1031 is gradually increased, thereby increasing the injection flow rate to meet the oil return amount requirement of the large-size compressor 200. When the valve plate 1061 moves downward, the opening degree of the outlet of the nozzle 1031 is gradually decreased, thereby decreasing the injection flow rate to meet the oil return amount requirement of the small-size compressor 200.

[0075] According to an embodiment of the present invention, referring to Figure 1 As shown in the figure, the ejector oil return device 100 of the present invention further includes: a first sight glass 107. The first sight glass 107 is integrally formed on the branch pipe 1012 and is mainly used to observe the flow state of the low-pressure oil in the branch pipe 1012, thereby judging whether the branch pipe 1012 is blocked, so as to improve the system safety.

[0076] In the embodiment of the present invention, by integrally forming the first sight glass 107 on the branch pipe 1012, the number of system connection points can be further reduced, the system failure rate can be reduced, and the system safety can be guaranteed.

[0077] According to an embodiment of the present invention, referring toFigure 1 As shown, the ejector oil return device 100 of the present invention further includes: a second sight glass 108, which is integrally formed on the ejector pipe 103, and is mainly used to observe the flow state of the high-pressure oil in the ejector pipe 103, so as to judge whether the ejector pipe 103 is blocked, thereby improving the system safety.

[0078] In the embodiment of the present invention, by integrally forming the second sight glass 108 on the ejector pipe 103, the number of system connection points can be further reduced, the system failure rate can be reduced, and the system safety can be guaranteed.

[0079] According to an embodiment of the present invention, referring to Figure 1 As shown, a reduced-diameter section 1032 is provided in the ejector pipe 103, and the cross-sectional area of the reduced-diameter section 1032 gradually becomes smaller along the direction from the inlet end to the outlet end of the ejector pipe 103, that is, gradually decreases from left to right; and the internal flow path of the nozzle 1031 is a constant-diameter section 1033, and the left end of the constant-diameter section 1033 is connected to the right end of the reduced-diameter section 1032.

[0080] With such a design, when the ejector pipe 103 injects high-pressure oil into the receiving chamber 10111 through the nozzle 1031, through the entrainment effect of the high-pressure oil, the low-pressure oil is entrained into the receiving chamber 10111 through the branch pipe 1012, and then the two parts of oil are mixed evenly in the mixing chamber 10112, and then return to the inside of the compressor 200 through the suction port of the compressor 200 to complete the oil return.

[0081] According to an embodiment of the second aspect of the present invention, referring to Figure 2 As shown, the present invention also provides a chilled water unit oil return system, which mainly includes: the ejector oil return device 100 of any of the above embodiments and a compressor 200, an oil separator 201, a condenser 202, an electronic expansion valve 203 and an evaporator 204 that are connected in a cycle, and the ejector oil return device 100 is respectively connected to the compressor 200, the oil separator 201 and the evaporator 204. Specifically, the ejector pipe 103 of the ejector oil return device 100 is connected to the oil separator 201, the branch pipe 1012 of the ejector oil return device 100 is connected to the evaporator 204, and the main pipe 1011 of the ejector oil return device 100 is connected to the suction port of the compressor 200.

[0082] During operation, the high-pressure refrigerant and oil mixture discharged by the compressor 200 flows into the oil separator 201 for separation. The separated high-pressure refrigerant and part of the high-pressure oil mixture flow into the condenser 202 through the outlet at the top of the oil separator 201 for condensation, and then are throttled, cooled and depressurized by the electronic expansion valve 203. The throttled low-pressure refrigerant and low-pressure oil flow through the evaporator 204, and the evaporated refrigerant then flows back into the compressor 200.

[0083] Moreover, another part of the high-pressure oil separated by the oil separator 201 enters the ejector pipe 103 from the bottom oil outlet of the oil separator 201 and is sprayed into the receiving chamber 10111 of the main pipe 1011. Under the entrainment effect of the high-pressure oil, the low-pressure oil in the evaporator 204 is entrained into the receiving chamber 10111 of the main pipe 1011 through the branch pipe 1012. Then, the two parts of oil are evenly mixed in the mixing chamber 10112 and then return to the inside of the compressor 200 through the suction port of the compressor 200, completing the oil return of the system.

[0084] It can be understood that if too much low-pressure oil is mixed into the refrigerant in the evaporator 204, the refrigeration effect of the evaporator 204 will be reduced. Therefore, by using the ejector oil return device 100 for ejector oil return, the oil content in the refrigerant can be reduced, thereby improving the refrigeration effect.

[0085] The oil return system of the water chiller provided by the embodiment of the present invention can achieve rapid installation through the above-mentioned integrated ejector oil return device, effectively reduce the number of system connection points, reduce the system failure rate, and thus ensure the system safety.

[0086] In the related art, the compressor directly returns oil through the oil return pipeline. When the oil return pipeline fails, the compressor needs to be shut down, resulting in the refrigerant being unable to operate normally and affecting the heat exchange effect.

[0087] To solve the above technical problems, referring to Figure 2 As shown, a first angle valve 205 is provided between the ejector oil return device 100 and the oil separator 201, a second angle valve 206 is provided between the ejector oil return device 100 and the evaporator 204, and a third angle valve 207 is provided between the ejector oil return device 100 and the compressor 200.

[0088] Specifically, the first angle valve 205 is respectively connected to the bottom oil outlet of the oil separator 201 and the solenoid valve 105, the second angle valve 206 is respectively connected to the evaporator 204 and the low-pressure oil inlet of the branch pipe 1012, and the third angle valve 207 is respectively connected to the mixing chamber 10112 of the main pipe 1011 and the suction port of the compressor 200.

[0089] In the embodiment of the present invention, by respectively providing angle valves at the three connection ends of the ejector oil return device 100, the on-off of the oil circuit can be controlled. When the ejector oil return device 100 is damaged and needs to be replaced and maintained, the three angle valves can be closed to prevent the leakage of the refrigerant and oil, and then disassembly and maintenance can be carried out, which will not affect the normal flow of the refrigerant circulation circuit of the system and ensure the heat exchange effect.

[0090] According to an embodiment of the present invention, referring to Figure 2 As shown, a drying filter 208 is provided between the condenser 202 and the electronic expansion valve 203.

[0091] Next, the control method of the ejector oil return device provided by the present invention will be described. The control method of the ejector oil return device described below can be mutually referred to the ejector oil return device described above.

[0092] According to an embodiment of the third aspect of the present invention, referring to Figure 3 as shown, the present invention also provides a control method for the ejector oil return device of the above embodiment, which mainly includes the following steps:

[0093] S100. Obtain the model information of the compressor 200.

[0094] S200. Determine the oil return demand of the compressor 200 according to the model information of the compressor 200.

[0095] S300. Control the flow regulator 106 to adjust the flow cross-sectional area of the nozzle 1031 according to the oil return demand of the compressor 200.

[0096] Specifically, the model information of the compressor 200 may include information such as the displacement specification, cylinder diameter, and rotational speed of the compressor 200. Different models of the compressor 200 have corresponding oil return usage requirements. Therefore, when the model information of the compressor 200 is obtained, the oil return demand corresponding to the model of the compressor 200 can be determined, and then the flow regulator 106 is controlled in real time to adjust the flow cross-sectional area of the nozzle 1031 so that the oil return amount ejected by the ejector oil return device 100 can meet the oil return usage demand of the compressor 200 in real time.

[0097] Therefore, the control method of the ejector oil return device provided by the embodiment of the present invention can adjust the ejector flow rate in real time according to the system oil return demand during actual use, thereby improving the operating stability of the chiller.

[0098] According to an embodiment of the fourth aspect of the present invention, referring to Figure 4 as shown, the present invention also provides a control device for the ejector oil return device of the above embodiment, which mainly includes: an acquisition module 401, a determination module 402, and a control module 403. Among them, the acquisition module 401 is used to obtain the model information of the compressor 200; the determination module 402 is used to determine the oil return demand of the compressor 200 according to the model information of the compressor 200; the control module 403 is used to control the flow regulator 106 to adjust the flow cross-sectional area of the nozzle 1031 according to the oil return demand of the compressor 200, so that the oil return amount ejected by the ejector oil return device 100 reaches the oil return demand of the compressor 200 and meets the usage demand of the compressor 200.

[0099] Therefore, the control device of the ejector oil return device provided by the embodiments of the present invention can, during actual use, adjust the ejector flow rate in real time according to the system oil return requirements, thereby improving the operating stability of the chiller.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ejector oil return device, characterized in that, the ejector oil return device is an integrally formed structure, including: a pipe body, including a main pipe and a branch pipe. An acceptance chamber and a mixing chamber are arranged in the main pipe and are axially communicated. The outlet end of the mixing chamber is connected to the suction port of the compressor. The branch pipe is radially communicated with the side part of the acceptance chamber and is used for introducing low-pressure oil into the acceptance chamber; a first filter, arranged in the branch pipe; an ejector pipe, the outlet end of the ejector pipe is provided with a nozzle, and the nozzle is located in the acceptance chamber and is used for injecting high-pressure oil into the acceptance chamber; a second filter, arranged in the ejector pipe; a solenoid valve, connected to the inlet end of the ejector pipe and used for controlling the on-off of the oil path of the ejector pipe.

2. The ejector oil return device according to claim 1, characterized in that, further comprising: a flow regulator, arranged at the nozzle and used for adjusting the flow cross-sectional area of the nozzle so as to adjust the injection flow rate of the nozzle.

3. The ejector oil return device according to claim 2, characterized in that, the flow regulator includes: a valve plate, located in the acceptance chamber and movably arranged radially at the outlet of the nozzle; a driving part, arranged outside the main pipe and drivingly connected to the valve plate, and used for driving the valve plate to move radially so as to adjust the opening degree of the outlet of the nozzle.

4. The ejector oil return device according to claim 1, characterized in that, further comprising: a first liquid sight glass, integrally formed on the branch pipe.

5. The ejector oil return device according to claim 1, characterized in that, further comprising: a second liquid sight glass, integrally formed on the ejector pipe.

6. The ejector oil return device according to any one of claims 1-5, characterized in that, a reduced diameter section is arranged in the ejector pipe, and the cross-sectional area of the reduced diameter section gradually becomes smaller along the direction from the inlet end to the outlet end of the ejector pipe; and the internal flow path of the nozzle is a constant diameter section, and the constant diameter section is connected to the reduced diameter section.

7. A refrigerant chiller oil return system, characterized in that, including: the ejector oil return device according to any one of claims 1-6 and a compressor, an oil separator, a condenser, an electronic expansion valve and an evaporator which are connected in a cycle, and the ejector oil return device is respectively connected to the compressor, the oil separator and the evaporator.

8. The refrigerant chiller oil return system according to claim 7, characterized in that, a first angle valve is arranged between the ejector oil return device and the oil separator, a second angle valve is arranged between the ejector oil return device and the evaporator, and a third angle valve is arranged between the ejector oil return device and the compressor.

9. A control method for the ejector oil return device according to claim 2 or 3, characterized in that, including: acquiring the model information of the compressor; determining the oil return demand of the compressor according to the model information of the compressor; controlling the flow regulator to adjust the flow cross-sectional area of the nozzle according to the oil return demand of the compressor.

10. A control device for the ejector oil return device according to claim 2 or 3, characterized in that, including: an acquisition module, used for acquiring the model information of the compressor; A determination module, configured to determine the oil return requirement of the compressor according to the model information of the compressor; A control module, configured to control the flow regulator to adjust the flow cross-sectional area of the nozzle according to the oil return requirement of the compressor.

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