Refrigerating unit and refrigerating system

Abstract

The refrigerating unit comprises a main compressor, an auxiliary compressor and an oil separator, the main compressor and the auxiliary compressor are connected with a first output branch pipe and a second output branch pipe correspondingly, and the first output branch pipe and the second output branch pipe are connected with the oil separator and used for conveying an oil-gas mixture to the oil separator; the oil separator is provided with an oil collecting pipe and a gas collecting pipe, the gas collecting pipe is used for gas output, and the oil collecting pipe is used for oil backflow. Through combined work of the main compressor and the auxiliary compressor, the refrigerating capacity of the whole system can be improved. When the requirement for refrigerating capacity output is low, the main compressor can work independently; when the refrigerating capacity output requirement is increased, the main compressor and the auxiliary compressor work at the same time, the auxiliary compressor supplements the refrigerating capacity, and the refrigerating capacity output by the whole system is increased.

Description

Technical Field

[0001] The present invention relates to refrigeration equipment, and more particularly to a refrigeration unit and a refrigeration system having the refrigeration unit. Background Art

[0002] Existing refrigeration systems typically use a single compressor for cooling, and their cooling capacity is limited by the capacity of that single compressor. To meet large cooling capacity demands, increasing the cooling capacity of a refrigeration system typically requires increasing the cooling power of a single compressor. However, increasing the cooling capacity of a single compressor has certain limitations, and this also reduces the flexibility of the refrigeration system.

[0003] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a refrigeration unit and a refrigeration system.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a refrigeration unit, including a main compressor, an auxiliary compressor and an oil separator, the main compressor and the auxiliary compressor are respectively connected to output branch pipe 1 and output branch pipe 2, the output branch pipe 1 and output branch pipe 2 are connected to the oil separator, and are used to transport the oil-gas mixture to the oil separator, the oil separator is provided with an oil collecting pipe and a gas collecting pipe, the gas collecting pipe is used for gas output, and the oil collecting pipe is used for oil reflux.

[0006] The present invention is further configured such that the output branch pipe 1 and the output branch pipe 2 are connected to an output main pipe and converge to the oil separator through the output main pipe; the oil collecting pipe is connected to a heat exchanger for heat exchange and cooling of the oil.

[0007] The present invention is further configured such that the oil separator is provided with an upper chamber and a lower chamber, an intermediate cylinder and a tapered cylinder are provided inside the upper chamber, the upper end of the intermediate cylinder is fixedly connected to the top of the upper chamber, and the lower end is located in the middle of the upper chamber, the gas collecting pipe is fixedly connected to the middle of the top of the upper chamber, and the lower end of the gas collecting pipe extends into the middle of the intermediate cylinder;

[0008] The present invention is further configured such that the conical tube is sleeved on the outer periphery of the intermediate tube, the conical tube is in an inverted cone shape, the outer periphery of the upper end of the conical tube is fixedly connected to the inner wall of the upper chamber, and the lower end of the conical tube is lower than the lower end of the intermediate tube.

[0009] The present invention is further configured such that an inlet 1 and an inlet 3 are opened on the outer periphery of the upper chamber, the position of the inlet 1 is higher than the upper end position of the conical cylinder, the position of the inlet 3 is lower than the upper end position of the conical cylinder, and higher than the lower end position of the conical cylinder.

[0010] The present invention is further configured such that the output branch pipe 1 is connected to the inlet 1, an inlet 2 is provided outside the lower chamber, and the output branch pipe 2 is connected to the inlet 2; a one-way valve is installed at the inlet 2 to control one-way conduction into the lower chamber;

[0011] The present invention is further configured to include a flow guide pipe, the upper end of the flow guide pipe is connected to the inlet three, the lower end of the flow guide pipe is connected to the lower chamber, and the solenoid valve two is installed at the connection between the lower end of the flow guide pipe and the lower chamber.

[0012] The present invention is further configured such that the lower end of the conical cylinder is coaxially connected with a straight cylinder portion, a separation device is installed in the straight cylinder portion, the separation device includes an upper cover plate, a scroll guide plate and a lower cover plate, the scroll guide plate has a winding structure, forming a scroll-shaped guide channel, the upper cover plate is fixed to the upper side of the scroll guide plate, and a center hole is opened in the middle; the lower cover plate is fixed to the upper and lower sides of the scroll guide plate, and is located entirely below the center hole, and the outline of the lower cover plate is larger than the center hole.

[0013] The present invention is further configured such that the lower side of the straight tube portion is immersed in the oil at the bottom of the upper chamber, and a plurality of notches are provided on the outer periphery of the lower side of the straight tube portion, and the notches are to be lower than the liquid level.

[0014] The present invention is further configured such that the separation device has an up and down movable stroke within the straight cylinder portion. At the uppermost side of the stroke, the position of the upper cover plate is higher than the upper end of the upper cover plate, the upper side of the upper cover plate abuts against the necking portion of the lower end of the intermediate cylinder, and an annular gap is formed on the outer periphery of the upper cover plate; at the lowermost side of the stroke, the upper cover plate is retracted into the inner periphery of the straight cylinder portion, and the annular gap on the outer periphery of the upper cover plate is closed.

[0015] The present invention is further configured to include a slide rod, a sliding sealing sleeve 1 is installed at the partition plate between the upper chamber and the lower chamber, the slide rod passes through the sliding sealing sleeve 1, the upper end of the slide rod is fixedly connected to the lower cover plate, the lower end of the slide rod extends into the lower chamber and is fixedly connected to a lower stopper, and the upper side of the lower stopper is elastically pressed by a spring;

[0016] The present invention is further configured such that a pressure relief hole is provided in the sliding rod, and opening one and opening two are provided on the outer periphery of the sliding rod. The sliding rod and the separation device move up and down synchronously. At the lowest side of the stroke, opening one and opening two are both located in the lower chamber; at the highest side of the stroke, opening one and opening two are respectively located on the upper and lower sides of the partition plate, and can connect the upper chamber and the lower chamber.

[0017] This embodiment also provides a refrigeration system, including the refrigeration unit as described above, where two compressors work together to increase the refrigeration capacity of the entire system.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The main compressor and the auxiliary compressor work together to increase the cooling capacity of the entire system. When the cooling output demand is low, the main compressor can work alone. When the cooling output demand increases, the main and auxiliary compressors work simultaneously, and the auxiliary compressor provides cooling capacity to increase the cooling output of the entire system.

[0020] By installing a separation device with a spiral deflector plate in a coiled structure, a spiral-shaped flow channel is formed. When the oil-gas mixture enters the deflector plate, it enters from the outer periphery of the deflector plate, flows along the spiral path of the deflector plate, and gradually flows toward the center of the deflector plate, forming a centrifugal vortex. As it gradually flows toward the inner periphery of the deflector plate, the radius of rotation becomes smaller and smaller, making it easier for oil droplets in the mixture to be shaken off. These droplets then adhere to the surface of the deflector plate and merge with other droplets to form larger droplets, thus achieving a supplementary separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of a refrigeration unit in Example 1;

[0022] Figure 2 This is a front view of a refrigeration unit in Example 1;

[0023] Figure 3 It is a three-dimensional diagram of the oil separator in Example 2;

[0024] Figure 4 This is a top view of the oil separator in Example 2;

[0025] Figure 5 is a cross-sectional view of the oil separator in Example 2;

[0026] Figure 6 This is an exploded view of the separation device in Example 2;

[0027] Figure 7 is a cross-sectional view of the oil separator in Example 3, showing the liquid level in the upper chamber;

[0028] Figure 8 is a cross-sectional view of the oil separator in the fourth embodiment, showing the separation device at the lower end position;

[0029] Figure 9 for Figure 8 Middle partial enlarged view;

[0030] Figure 10 is a cross-sectional view of the oil separator in the fourth embodiment, showing the separation device at the upper end position;

[0031] Figure 11 for Figure 10 A partial enlarged view.

[0032] Figure numerals: main compressor 1; auxiliary compressor 2; oil separator 3; liquid level 300; upper chamber 31; lower chamber 32; partition plate 33; inlet 1 34; inlet 2 35; one-way valve 36; inlet 3 37; guide pipe 38; solenoid valve 2 39; gas collecting pipe 310; intermediate cylinder 311; necking portion 312; tapered cylinder 313; straight cylinder portion 314; notch 315; heat exchanger 4; oil collecting pipe 5; solenoid valve 1 6; output main pipe 7; output branch pipe 1 71; output branch pipe 2 72; separation device 8; upper cover plate 81; center hole 811; annular gap 812; scroll guide plate 82; lower cover plate 83; slide rod 9; sliding sealing sleeve 1 91; lower stopper 92; upper stopper 93; pressure relief hole 94; opening 1 941; opening 2 942; spring 95; lifting drive rod 10; sealing guide sleeve 2 101. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment discloses a refrigeration unit, referring to Figure 1-Figure 3 As shown, it includes a main compressor 1, an auxiliary compressor 2, an oil separator 3 and other refrigeration components. Through the operation of the main compressor 1 and the auxiliary compressor 2, the refrigeration unit can be operated, and then refrigeration can be achieved.

[0036] The main compressor 1 and the auxiliary compressor 2 are connected to an output branch pipe 1 71 and an output branch pipe 2 72 , respectively. These output branches 1 71 and 72 are connected to an oil separator 3 , capable of delivering an oil-gas mixture to the oil separator 3 . During the compression process, the output from the main compressor 1 and the auxiliary compressor 2 contains both refrigeration medium gas and lubricating oil. The oil separator 3 separates the oil and gas, and the separated oil is output through the oil collecting pipe 5 , where it can flow back to the compressor and continue to participate in the lubrication cycle. The refrigeration medium gas is then output through the gas collecting pipe 310 and enters the refrigerant medium cycle.

[0037] A heat exchanger 4 is connected to the middle section of the oil collecting pipe 5. This cools the returning oil to its original temperature upon returning to the compressor, preventing overheating. Furthermore, near the connection point between the main compressor 1 and the auxiliary compressor 2, the oil collecting pipe 5 splits into two branches, one connected to the main compressor 1 and the other to the auxiliary compressor 2. Solenoid valves 6 are installed on each branch of the oil collecting pipe 5 to control the return flow of the oil. When the oil level in the corresponding compressor falls below a preset value, the corresponding solenoid valve 6 activates oil replenishment.

[0038] This embodiment discloses two connection forms of the main compressor 1 and the auxiliary compressor 2:

[0039] The first one, refer to Figure 1 、 Figure 2 As shown, the two output branches of the main compressor 1 and the auxiliary compressor 2 converge with each other, that is, the output branch 1 71 and the output branch 2 72 are connected to the output main pipe 7, and converge to the oil separator 3 through the output main pipe 7; the first type, referring to Figure 3 As shown, the output branch pipe 1 71 and the output branch pipe 2 72 are respectively connected to the oil separator 3 , and the oil separator 3 has two input pipelines.

[0040] In this embodiment, the combined operation of main compressor 1 and auxiliary compressor 2 can increase the cooling capacity of the entire system. When the cooling output demand is low, main compressor 1 can operate alone. When the cooling output demand increases, main compressor 1 and auxiliary compressor 2 operate simultaneously, with auxiliary compressor 2 providing additional cooling capacity, thereby increasing the cooling capacity of the entire system.

[0041] Example 2

[0042] This embodiment discloses a refrigeration unit. Based on the first embodiment, Figure 3-Figure 6 , a detailed description is given, mainly focusing on further designing the second form of the main compressor 1 and the auxiliary compressor 2 in the first embodiment.

[0043] Reference Figure 5 As shown, the oil separator 3 comprises an upper chamber 31 and a lower chamber 32. Both the upper chamber 31 and the lower chamber 32 are pressure-resistant chambers separated by a partition plate 33. An intermediate cylinder 311 and a tapered cylinder 313 are disposed within the upper chamber 31. The upper end of the intermediate cylinder 311 is fixedly connected to the top of the upper chamber 31, and the lower end is located in the middle of the upper chamber 31.

[0044] The gas collecting pipe 310 is fixedly connected to the center of the top of the upper chamber 31, with its lower end extending into the middle of the intermediate tube 311. The conical tube 313 is sleeved around the outer periphery of the intermediate tube 311, and the conical tube 313 and the intermediate tube 311 are installed coaxially. The conical tube 313 has an inverted cone shape, with its upper end fixedly connected to the inner wall of the upper chamber 31, and its lower end lower than the lower end of the intermediate tube 311.

[0045] A circumferential three-layer structure can be formed by the intermediate cylinder 311 and the conical cylinder 313, wherein the outermost layer is the annular chamber formed between the conical cylinder 313 and the upper chamber 31, the middle layer is the annular chamber formed between the intermediate cylinder 311 and the conical cylinder 313, and the innermost layer is the chamber on the inner circumference of the conical cylinder 313, which can realize the separate treatment of the two oil and gas mixtures.

[0046] An inlet 1 34 and an inlet 37 are provided on the outer periphery of the upper chamber 31. Figure 4 As shown, the directions of inlet 1 34 and inlet 37 are both set in the tangential direction of the upper chamber 31. When input, a vortex can be formed. Under the action of the vortex, the heavier oil droplets of the oil-gas mixture can be thrown to the periphery and attached to the corresponding inner wall to form larger oil droplets, which then flow down and converge at the bottom of the upper chamber 31. The gas is lighter and will converge at a position offsetting the center, and then be discharged upward from the gas collecting pipe 310 to achieve oil and gas separation.

[0047] Specifically, in this embodiment, inlet 1 (34) is positioned higher than the upper end of conical barrel 313, while inlet 3 (37) is positioned lower than the upper end of conical barrel 313 and higher than the lower end of conical barrel 313. Output branch 1 (71) connects to inlet 1 (34). The oil-air mixture output by main compressor 1 passes through output branch 1 (71) and enters upper chamber 31, where it forms a swirling flow within the annular chamber between intermediate barrel 311 and conical barrel 313.

[0048] The lower chamber 32 is provided with an inlet 2 35, and the output branch 2 72 is connected to the inlet 2 35. In addition, the upper chamber 31 and the lower chamber 32 can be connected to each other through a guide tube 38, the upper end of the guide tube 38 is connected to the inlet 3 37, and the lower end of the guide tube 38 is connected to the lower chamber 32.

[0049] To prevent pressure backflow from the lower chamber 32, a one-way valve 36 is installed at the second inlet 35 to control one-way flow into the lower chamber 32. This prevents the pressure medium from flowing back into the auxiliary compressor 2. Furthermore, a second solenoid valve 39 is installed at the connection between the lower end of the flow guide tube 38 and the lower chamber 32. When the oil-gas mixture in the lower chamber 32 needs to be discharged, the second solenoid valve 39 is opened. Under the action of pressure (the pressure in the lower chamber 32 must be greater than that in the upper chamber 31), the oil-gas mixture in the lower chamber 32 can flow into the upper chamber 31 and enter the annular chamber outside the tapered cylinder 313 through the third inlet 37, forming a centrifugal vortex.

[0050] To discharge the oil medium from the lower chamber 32, the flow guide tube 38 is connected to the lower side of the lower chamber 32. When the oil-gas mixture in the lower chamber 32 is discharged, the oil at the bottom of the lower chamber is also discharged into the upper chamber 31, thereby converging the oil in the upper chamber 31. Furthermore, the oil collecting pipe 5 is connected to the lower periphery of the upper chamber 31 to provide a return flow for the oil at the bottom of the upper chamber 31.

[0051] When the refrigeration capacity demand of the refrigeration system is small, the main compressor 1 is in operation, and the oil-gas mixture output from the output branch pipe 1 71 enters the chamber between the conical cylinder 313 and the intermediate cylinder 311, forming a pressure vortex, centrifugally separating the oil droplets to form a relatively clean medium gas, which is output from the gas collecting pipe 310 and enters the subsequent cooling cycle.

[0052] At this time, the auxiliary compressor 2 is intermittently working, pressurizing the oil-gas mixture, and the output oil-gas mixture enters the lower chamber 32, where the pressure is temporarily stored and a certain pressure is maintained in the lower chamber 32. The pressure maintained in the lower chamber 32 is greater than the pressure in the upper chamber 31.

[0053] When the cooling capacity demand of the refrigeration system increases, the solenoid valve 2 39 opens, and the guide pipe 38 connects the upper chamber 31 and the lower chamber 32. Under the action of the high pressure in the lower chamber 32, the oil and gas mixed medium in the lower chamber 32 can enter the inner wall of the upper chamber 31 and the outer annular space of the tapered cylinder 313 from the guide pipe 38, and first swirl in the outer annular space of the tapered cylinder 313 to achieve oil and gas separation, and then flow upward from the straight cylinder part 314 and enter the middle cylinder 311 to form gas discharge.

[0054] Furthermore, since there is more oil mixed in the oil-gas mixture in the lower chamber 32, especially during the initial pressure relief and discharge process of the lower chamber 32, the oil at the bottom of the lower chamber 32 will be discharged in a concentrated manner, which may generate a short-term and high separation pressure.

[0055] In order to improve the efficiency of oil-gas separation, a separation device 8 can be added for additional separation. Figure 5 、 Figure 6 As shown, the lower end of the conical cylinder 313 is coaxially connected to a straight cylinder portion 314 , and a separation device 8 is installed in the straight cylinder portion 314 .

[0056] The separation device 8 includes an upper cover plate 81, a scroll guide plate 82 and a lower cover plate 83. The scroll guide plate 82 has a winding structure to form a scroll-shaped guide channel. The upper cover plate 81 is fixed to the upper side of the scroll guide plate 82 and has a center hole 811 in the middle.

[0057] When the oil-gas mixture enters the scroll guide plate 82, it enters from the outer periphery of the scroll guide plate 82, flows along the scroll direction of the scroll guide plate 82, and gradually flows toward the center of the scroll guide plate 82, forming a centrifugal vortex. As it gradually flows toward the inner periphery of the scroll guide plate 82, the radius of rotation becomes smaller and smaller, making it easier for the oil droplets in the mixture to be shaken off. These droplets then adhere to the surface of the scroll guide plate 82 and merge with other droplets to form larger droplets, thus achieving a supplementary separation effect.

[0058] Furthermore, because the lower cover plate 83 is fixed to the upper and lower sides of the scroll guide plate 82 and is located entirely below the center hole 811, and because its profile is larger than the center hole 811, the lower cover plate 83 can block the lower center of the scroll guide plate 82, allowing the oil-gas mixture to enter only from the lower outer periphery of the scroll guide plate 82, forming a flow pattern from the outer periphery to the inner periphery of the scroll guide plate 82, thereby achieving cyclonic separation within the scroll guide plate 82. Ultimately, the remaining separated medium can flow upward from the center hole 811 in the center of the upper cover plate 81.

[0059] Example 3

[0060] This embodiment discloses a refrigeration unit. Based on the second embodiment, Figure 7 , for detailed explanation.

[0061] In this embodiment, the lower side of the straight tube portion 314 is immersed in the oil at the bottom of the upper chamber 31 . A plurality of notches 315 are formed on the outer periphery of the lower side of the straight tube portion 314 . The notches 315 are to be lower than the liquid level 300 .

[0062] Because the oil level 300 in the upper chamber 31 is slightly higher than the notch 315, the oil can relatively isolate the inner and outer peripheries of the conical cylinder 313. When the oil-gas mixture is introduced into inlet 37, the pressure around the outer periphery of the conical cylinder 313 increases, causing the liquid level around the outer periphery of the conical cylinder 313 (the straight portion 314) to slightly drop until it falls below the notch 315. The remaining oil-gas mixture can then enter the inner periphery of the straight portion 314 through the notch 315. The oil-gas mixture introduced through inlet 37 passes through the oil at the bottom of the upper chamber 31 and, in the form of bubbles, flows upward from the center of the straight portion 314. It then enters the separation device 8 for separation, resulting in a relatively clean gaseous medium.

[0063] Because the oil-gas mixture in lower chamber 32 contains a significant amount of oil, particularly during the initial pressure relief process, the oil at the bottom of lower chamber 32 is concentrated and discharged, potentially generating a short-term, high separation pressure. Oil injected from inlet 37 into upper chamber 31 impacts the outer wall of conical barrel 313, forming a large number of atomized oil droplets. This makes it difficult to completely separate these droplets, especially the small oil droplets, during the subsequent cyclone treatment.

[0064] In this embodiment, by controlling the height of the straight cylinder portion 314 and the liquid level, the oil-gas mixture input by the inlet three 37 will first pass through the oil at the bottom of the upper chamber 31 to wash the atomized oil droplets. The originally atomized small particle oil droplets will be directly mixed into the oil at the bottom, and then the gas medium will overflow from the oil in the form of bubbles and be separated in the separation device 8. To a certain extent, it can reduce the pressure of the oil droplets and control the oil separation pressure at the separation device 8 within an appropriate range, which is almost unaffected by the mist oil droplets in the oil-gas medium on the periphery of the conical cylinder 313.

[0065] Example 4

[0066] This embodiment discloses a refrigeration unit, based on the second or third embodiment, and referring to Figures 8-11 , for detailed explanation.

[0067] In the straight tube portion 314 , the separating device 8 adopts a structure capable of moving up and down, and the separating device 8 has an up and down movable stroke in the straight tube portion 314 .

[0068] Reference Figure 10 、 Figure 11 As shown, when the separation device 8 is at the uppermost side of the stroke, the upper cover plate 81 is positioned higher than the upper end of the upper cover plate 81 , and the upper side of the upper cover plate 81 abuts against the constricted portion 312 at the lower end of the intermediate cylinder 311 , forming an annular gap 812 around the outer periphery of the upper cover plate 81 ;

[0069] Reference Figure 8 、 Figure 9 As shown, when the separation device 8 is at the lowest side of the stroke, the upper cover plate 81 is retracted into the inner periphery of the straight cylindrical portion 314, and the annular gap 812 on the outer periphery of the upper cover plate 81 is closed.

[0070] A sliding sealing sleeve 91 is installed on the partition plate 33 between the upper chamber 31 and the lower chamber 32. A through hole is formed in the middle of the sliding sealing sleeve 91. The sliding rod 9 passes through the sliding sealing sleeve 91 to achieve sealed sliding, so that the upper and lower ends of the sliding rod 9 can respectively extend into the upper chamber 31 and the lower chamber 32.

[0071] The upper end of the slide rod 9 is fixedly connected to the lower cover plate 83. In order to improve the sliding stability of the slide rod 9 and the separation device 8, a sliding guide bracket can be installed on the inner periphery of the conical cylinder 313 to assist in guiding the slide rod 9 and ensure that the lifting and lowering formation can be stable.

[0072] The lower end of the slide rod 9 extends into the lower chamber 32 and is fixedly connected to a lower stopper 92. The upper side of the lower stopper 92 is elastically pressed by a spring 95. The elastic action of the spring 95 can maintain the slide rod 9 and the separation device 8 in the formed lowermost position.

[0073] In addition, in order to limit the stroke, an upper stop block 93 can be fixedly connected to the outside of the slide rod 9. The upper stop block 93 is located in the upper chamber 31. Through the mutual pressure between the upper stop block 93 and the sliding sealing sleeve 91, the stroke of the slide rod 9 and the separation device 8 can be limited.

[0074] Reference Figure 9 、 Figure 10 As shown, a pressure relief hole 94 is provided within the slide bar 9, and opening 1 941 and opening 2 942 are provided on the outer periphery of the slide bar 9. The slide bar 9 moves up and down synchronously with the separation device 8. At the lowest point of its travel, opening 1 941 and opening 2 942 are both located within the lower chamber 32. At the highest point of its travel, opening 1 941 and opening 2 942 are located on the upper and lower sides of the partition plate 33, respectively, connecting the upper chamber 31 with the lower chamber 32.

[0075] When the pressure difference between the upper chamber 31 and the lower chamber 32 is too large, the internal pressure of the lower chamber 32 can push the slide rod 9 to slide upward until it reaches the upper end of the movable stroke. At this time, opening 1 941 and opening 2 are respectively located on the upper and lower sides of the partition plate 33, and the pressure relief hole 94 can connect the upper chamber 31 and the lower chamber 32, discharge the pressure in the lower chamber 32, and input the oil and gas mixed medium in the lower chamber into the upper chamber 31, thereby reducing the refrigeration pressure of the main compressor 1; at the same time, it avoids the pressure maintained in the lower chamber 32 from being too large, and can also avoid the excessive pressure difference between the upper chamber 31 and the lower chamber 32, which causes uneven force on the partition plate 33, thereby maintaining the stability of the oil separator 3.

[0076] Reference Figure 11 As shown, when the separation device 8 is at the uppermost end of its travel, the upper cover plate 81 substantially blocks the lower end (recessed portion 312) of the intermediate barrel 311, forming an annular gap 812 around the outer periphery of the upper cover plate 81. At this point, the oil-gas mixture input from inlet 1 34 descends along the tapered barrel 313, passes through the annular gap 812 between the tapered barrel 313 and the upper cover plate 81, and enters the scroll guide plate 82 on the underside of the upper cover plate 81. The mixture then flows from the outer periphery to the inner periphery along the flow path of the scroll guide plate 82, achieving further cyclonic separation. This further cyclonic separation treatment of the oil-gas mixture input from inlet 1 34 improves the separation efficiency of the oil-gas mixture input to the main compressor 1.

[0077] Furthermore, the bottom of the lower chamber 32 can be installed with a lifting drive rod 10 and a second sealing guide sleeve 101. The second sealing guide sleeve 101 is installed on the lower side wall of the lower chamber 32. The lifting drive rod 10 passes through the second sealing guide sleeve 101 and extends into the lower chamber 32, achieving a sliding seal effect through the second sealing guide sleeve 101. To improve the sliding seal effect, multiple sets can be installed to maintain the sealing effect.

[0078] The lifting drive rod 10 can be raised and lowered by the driver. The upper end of the lifting drive rod 10 is opposite to the lower stop block 92. By adjusting the lifting drive rod 10 upward, the lower stop block 92 and the slide rod 9 and other components can be pushed upward, and then the separation device 8 can be actively adjusted upward, so that the separation device 8 can actively intervene in the separation path of the medium input by the main compressor 1 to improve the separation efficiency.

[0079] This embodiment further provides a refrigeration system, including a refrigeration unit as in the above embodiment, where two compressors work together to increase the refrigeration capacity of the entire system.

[0080] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A refrigeration unit, characterized in that: The invention comprises a main compressor (1), an auxiliary compressor (2) and an oil separator (3), wherein the main compressor (1) and the auxiliary compressor (2) are respectively connected to an output branch pipe 1 (71) and an output branch pipe 2 (72), wherein the output branch pipe 1 (71) and the output branch pipe 2 (72) are connected to the oil separator (3) and are used to transport an oil-gas mixture to the oil separator (3), and the oil separator (3) is provided with an oil collecting pipe (5) and an air collecting pipe (310), wherein the air collecting pipe (310) is used for gas output, and the oil collecting pipe (5) is used for oil return.

2. The refrigeration unit according to claim 1, characterized in that: The output branch pipe 1 (71) and the output branch pipe 2 (72) are connected to the output main pipe (7) and converge to the oil separator (3) through the output main pipe (7); the oil collecting pipe (5) is connected to the heat exchanger (4) for heat exchange and cooling of the oil.

3. The refrigeration unit according to claim 1, characterized in that: The oil separator (3) is provided with an upper chamber (31) and a lower chamber (32); an intermediate cylinder (311) and a conical cylinder (313) are provided inside the upper chamber (31); the upper end of the intermediate cylinder (311) is fixedly connected to the top of the upper chamber (31), and the lower end is located in the middle of the upper chamber (31); the gas collecting pipe (310) is fixedly connected to the middle of the top of the upper chamber (31), and the lower end of the gas collecting pipe (310) extends into the middle of the intermediate cylinder (311); The conical cylinder (313) is sleeved on the outer periphery of the intermediate cylinder (311). The conical cylinder (313) is in an inverted cone shape. The outer periphery of the upper end of the conical cylinder (313) is fixedly connected to the inner wall of the upper chamber (31), and the lower end of the conical cylinder (313) is lower than the lower end of the intermediate cylinder (311).

4. The refrigeration unit according to claim 3, characterized in that: The outer periphery of the upper chamber (31) is provided with an inlet 1 (34) and an inlet 3 (37). The position of the inlet 1 (34) is higher than the upper end of the conical cylinder (313), and the position of the inlet 3 (37) is lower than the upper end of the conical cylinder (313) and higher than the lower end of the conical cylinder (313).

5. The refrigeration unit according to claim 4, characterized in that: The output branch pipe 1 (71) is connected to the inlet 1 (34), and the lower chamber (32) is provided with an inlet 2 (35). The output branch pipe 2 (72) is connected to the inlet 2 (35); a one-way valve (36) for controlling one-way conduction into the lower chamber (32) is installed at the inlet 2 (35); The invention also includes a flow guide tube (38), the upper end of which is connected to the third inlet (37), the lower end of which is connected to the lower chamber (32), and a second solenoid valve (39) is installed at the connection between the lower end of the flow guide tube (38) and the lower chamber (32).

6. The refrigeration unit according to claim 4, characterized in that: The lower end of the conical cylinder (313) is coaxially connected to a straight cylinder portion (314), and a separation device (8) is installed in the straight cylinder portion (314). The separation device (8) includes an upper cover plate (81), a scroll guide plate (82) and a lower cover plate (83). The scroll guide plate (82) has a winding structure to form a scroll-shaped guide channel. The upper cover plate (81) is fixed to the upper side of the scroll guide plate (82) and has a center hole (811) in the middle; the lower cover plate (83) is fixed to the upper and lower sides of the scroll guide plate (82) and is located entirely below the center hole (811), and the outline of the lower cover plate (83) is larger than the center hole (811).

7. The refrigeration unit according to claim 6, characterized in that: The lower side of the straight tube portion (314) is immersed in the oil at the bottom of the upper chamber (31), and a plurality of notches (315) are provided on the outer periphery of the lower side of the straight tube portion (314), and the notches (315) are to be lower than the liquid level (300).

8. The refrigeration unit according to claim 6, characterized in that: The separation device (8) has an up and down movable stroke in the straight cylinder portion (314). At the uppermost side of the stroke, the upper cover plate (81) is positioned higher than the upper end of the upper cover plate (81), the upper side of the upper cover plate (81) abuts against the constricted portion (312) at the lower end of the intermediate cylinder (311), and an annular gap (812) is formed on the outer periphery of the upper cover plate (81); at the lowermost side of the stroke, the upper cover plate (81) is retracted into the inner periphery of the straight cylinder portion (314), and the annular gap (812) on the outer periphery of the upper cover plate (81) is closed.

9. The refrigeration unit according to claim 8, characterized in that: It also includes a slide rod (9), a sliding sealing sleeve (91) is installed at the partition plate (33) between the upper chamber (31) and the lower chamber (32), the slide rod (9) passes through the sliding sealing sleeve (91), the upper end of the slide rod (9) is fixedly connected to the lower cover plate (83), the lower end of the slide rod (9) extends into the lower chamber (32) and is fixedly connected to a lower stopper (92), and the upper side of the lower stopper (92) is elastically pressed by a spring (95); A pressure relief hole (94) is provided in the slide bar (9), and an opening 1 (941) and an opening 2 (942) are provided on the outer periphery of the slide bar (9). The slide bar (9) and the separation device (8) move up and down synchronously. At the bottom of the stroke, the opening 1 (941) and the opening 2 (942) are both located in the lower chamber (32); at the top of the stroke, the opening 1 (941) and the opening 2 (942) are respectively located on the upper and lower sides of the partition plate (33), and can connect the upper chamber (31) and the lower chamber (32).

10. A refrigeration system, characterized in that: The refrigeration unit comprises the refrigeration unit according to any one of claims 1 to 9.

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