Oil separator and refrigerating unit

Abstract

The utility model discloses an oil separator and a refrigerating unit, the oil separator comprises: a housing, the inner cavity of which is divided into a silencing section with an air inlet and an oil subsection with an air outlet; the inner shell is installed on the silencing section, silencing holes are distributed in the side wall of the inner shell, the inlet end of the inner shell communicates with the air inlet, and the outlet end of the inner shell communicates with the oil section; and the separation assembly is installed above the oil channel of the oil section, the separation assembly comprises a first baffle right facing the outlet end of the inner shell and a second baffle arranged between the air outlet and the first baffle in a separated mode, the area between the first baffle and the second baffle is a first filtering flow channel, and the area between the second baffle and the air outlet is a second filtering flow channel. The oil separator provided by the utility model integrates oil separation and noise reduction functions, and realizes high-efficiency oil separation and low-noise emission by optimizing the internal structure of the oil separator.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigerating system technical field especially is related to integrated oil separator of sound attenuation function and refrigerating unit. BACKGROUND

[0002] As an important component of refrigerating unit, the main function of oil separator is to separate the lubricating oil in high-pressure steam discharged by compressor to ensure the safe and efficient operation of refrigerating system. The traditional oil separator usually adopts physical separation principle, reduces airflow velocity and changes airflow direction to make the oil particles in high-pressure steam separated under the action of gravity and returned to the compressor through the oil return device.

[0003] As the core component of refrigerating system, the noise generated during the exhaust process of compressor not only affects user experience, but also may cause environmental noise pollution problem, causing unnecessary disturbance to the surrounding environment and personnel, especially in places with high noise control requirements, such as hospitals, schools, etc. For large parallel units, multiple compressors work simultaneously, and the noise problem is more prominent. However, the oil separator that has appeared in the prior art is difficult to achieve ideal effect in separation efficiency and noise control, which not only affects the overall performance of refrigerating unit, but also increases the maintenance cost and fault risk of the system.

[0004] Therefore, how to design an oil separator with sound attenuation function and high separation efficiency and a refrigerating unit is a technical problem to be solved in the industry. INVENTION CONTENTS

[0005] In order to solve the above-mentioned defects existing in the prior art, the utility model provides an oil separator and a refrigerating unit, which is designed with a sound attenuation section and an oil separation section, and has sound attenuation function and separation efficiency, effectively reduces the exhaust noise of compressor, and improves the overall performance of unit.

[0006] The technical scheme adopted by the utility model is to design an oil separator, which comprises:

[0007] A shell, the inner cavity of which is divided into a sound attenuation section with an air inlet and an oil separation section with an air outlet;

[0008] An inner shell installed in the sound attenuation section, the side wall of which is distributed with sound attenuation holes, and the inlet end of which is communicated with the air inlet and the outlet end of which is communicated with the oil separation section;

[0009] A separation assembly installed above the oil channel of the oil separation section, which comprises a first baffle opposite to the outlet end of the inner shell.

[0010] Further, the separation assembly further comprises:

[0011] A second baffle is arranged between the air outlet and the first baffle, and a region between the first baffle and the second baffle is a first filtering flow channel, and a region between the second baffle and the air outlet is a second filtering flow channel.

[0012] A first filtering layer is arranged in the first filtering flow channel.

[0013] A second filtering layer is arranged in the second filtering flow channel.

[0014] Further, the first baffle and the second baffle are vertically arranged, the top of the first baffle is spaced apart from the inner top surface of the oil section, and the bottom of the second baffle is spaced apart from the oil channel of the oil section.

[0015] Further, the separation assembly further comprises:

[0016] An oil baffle is arranged to receive the oil falling from the separation assembly, and the oil baffle is arranged at the lower part of the oil section to form the oil channel of the oil section.

[0017] Further, the oil baffle is provided with oil grooves, and the oil falls from the oil grooves into the oil channel.

[0018] Further, the oil separator further comprises a secondary oil storage tank connected to the oil channel of the oil section through an oil outlet pipe, and the secondary oil storage tank is fixedly arranged outside the shell.

[0019] Further, the shell is in a cylindrical shape and horizontally arranged, the inner cavity of the shell is divided into the sound reduction section and the oil section along the axial direction, the outer end surface of the sound reduction section is provided with an air inlet, and the top of the oil section is provided with an air outlet.

[0020] The utility model also provides a refrigerating unit, which comprises a compressor and the oil separator, and the air inlet of the oil separator is connected to the air outlet of the compressor.

[0021] Further, the refrigerating unit comprises a total oil storage tank and a plurality of parallel compressors, each of the compressors is provided with the oil separator, the secondary oil storage tank of the oil separator is connected to the total oil storage tank through a secondary oil return pipe, and the total oil storage tank is connected to each of the compressors through an oil return branch pipe.

[0022] Further, the secondary oil storage tank and the total oil storage tank are provided with liquid level sensors, the secondary oil return pipe is provided with a secondary oil return valve, and the oil return branch pipe is provided with an adjusting valve; wherein the controller of the refrigerating unit receives detection data of the liquid level sensors and controls the opening degrees of the secondary oil return valve and the adjusting valve.

[0023] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0024] 1. The oil separator integrates oil separation and noise reduction functions, by optimizing the internal structure of the oil separator, the inner cavity of the shell is divided into a noise reduction section and an oil separation section, the inner shell with distributed noise reduction holes is designed in the noise reduction section, and a separation assembly is designed between the outlet end of the inner shell and the gas outlet of the shell, thereby realizing efficient oil separation and low noise emission.

[0025] 2. The oil separator is provided with a secondary oil tank, which is fixedly installed on the shell of the oil separator, and the entire oil separator is designed in a modular manner, which can be flexibly combined according to actual needs (such as the number of compressors), and is suitable for different application scenarios.

[0026] 3. In a refrigeration unit with multiple parallel compressors, an oil separator is arranged for each compressor, the oil separated by the oil separators is collected into a total oil tank, and then returned to the compressors through an oil return branch pipe, and a controller monitors the liquid level data of the secondary oil tank and the total oil tank and adjusts the oil return state. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be described in detail below in combination with embodiments and drawings, in which:

[0028] Figure 1 is a structural schematic view of the oil separator of the utility model;

[0029] Figure 2 is a flow direction schematic view of the oil separator of the utility model;

[0030] Figure 3 is a connection schematic view of the refrigeration unit of the utility model;

[0031] Figure 4 is a refrigerant flow direction schematic view of the refrigeration unit of the utility model;

[0032] Figure 5 is a lubricating oil flow direction schematic view of the refrigeration unit of the utility model;

[0033] BRIEF DESCRIPTION OF DRAWINGS: 1. Oil separator; 2. Shell; 3. Noise reduction section; 4. Oil separation section; 5. Inlet; 6. Gas outlet; 7. Inner shell; 8. First baffle; 9. Oil way; 10. Second baffle; 11. First filter layer; 12. Second filter layer; 13. Oil baffle; 14. Oil outlet pipe; 15. Secondary oil tank; 16. Compressor; 17. Total oil tank; 18. Secondary oil return pipe; 19. Oil return branch pipe; 20. Secondary oil return valve; 21. Regulating valve; 22. Suction main pipe; 23. Exhaust main pipe. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical schemes and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0035] As shown in Figure 1 , 2 The oil separator integrates oil separation and noise elimination functions, realizes efficient oil separation and low noise emission by optimizing the internal structure of the oil separator.

[0036] Specifically, the oil separator 1 comprises: an outer shell 2, an inner shell 7 and a separation assembly, the inner cavity of the outer shell 2 is divided into a noise elimination section 3 and an oil separation section 4, the noise elimination section 3 has an air inlet 5, the oil separation section 4 has an air outlet 6, the oil separator 1 is connected to the air outlet of the compressor 16 through the air inlet 5 and connected to the condenser through the air outlet 6.

[0037] The inner shell 7 is installed in the noise elimination section 3, the inlet end of the inner shell 7 is communicated with the air inlet 5, the outlet end of the inner shell 7 is communicated with the oil separation section 4, the mixed gas entering the inner shell 7 from the air inlet 5 flows into the oil separation section 4 for oil-gas separation after passing through the inner shell 7, and the side wall of the inner shell 7 is distributed with noise elimination holes.

[0038] The design principle of the noise elimination holes is that the frequency range that can be heard by human ears is usually called the hearing range or audible range, and for most people, this range is about 20Hz to 20000Hz. Based on this, the inner shell is provided with holes of different spacings arranged according to the principle of the Helmholtz resonator, the noise elimination holes can be regarded as the neck of the resonator, and the cavity between the outer wall of the inner shell 7 and the inner wall of the outer shell 2 is regarded as the air cavity of the resonator, the noise elimination holes produce resonance within the resonance frequency (20Hz-20000Hz) when the mixed gas passes through the inner shell 7, thereby consuming or weakening the sound wave energy of these frequencies to achieve the effect of noise elimination.

[0039] The separation assembly is installed in the oil separation section 4, the bottom of the oil separation section 4 is an oil channel 9, and the separation assembly is located above the oil channel 9. The separation assembly comprises a first baffle 8, and the first baffle 8 is opposite to the outlet end of the inner shell 7 to enhance the collision and adhesion of oil droplets. When the airflow flows out of the outlet end of the inner shell 7 and meets the first baffle 8, the direction of the airflow will change sharply, and the oil droplets will continue to move in the original direction due to the inertial effect, thereby colliding with the first baffle 8. The oil droplets after collision are more likely to adhere to the first baffle 8, and then fall to the bottom of the oil separator 1 under the action of gravity, thereby realizing effective separation of the oil droplets.

[0040] In addition, the baffle plate designed opposite to the outlet end of the inner shell 7 can disperse the originally concentrated airflow impact into multiple directions, and such dispersion helps to reduce the noise intensity and frequency generated by airflow impact, and avoids the airflow from directly impacting the inner cavity of the outer shell 2, reduces the noise transmitted to the outside of the oil separator, and effectively improves the noise reduction effect of the oil separator.

[0041] As shown in Figure 1 、 2 To improve the oil separation effect, in some feasible embodiments of the utility model, the separation assembly further comprises: a second baffle plate 10, a first filter layer 11 and a second filter layer 12, the second baffle plate 10 is separated between the air outlet 6 and the first baffle plate 8, forming two predetermined separation areas, the area between the first baffle plate 8 and the second baffle plate 10 is a first filter flow channel, and the area between the second baffle plate 10 and the air outlet 6 is a second filter flow channel, so that the airflow flows orderly in the oil section 4, so as to promote the effective capture and separation of oil droplets.

[0042] The first filter layer 11 is shielded in the first filter flow channel, and the airflow flows to the first filter flow channel after impacting the first baffle plate 8, the first filter layer 11 can adopt a filter screen, and the first filter layer 11 can effectively intercept and collect larger oil droplet particles in the airflow, and complete the first oil separation.

[0043] The second filter layer 12 is shielded in the second filter flow channel, and the airflow flows to the second filter flow channel after passing through the first filter flow channel, the second filter layer 12 can adopt two filter screens, and the second filter layer 12 can capture small oil mist particles, and ensure the purity of the finally discharged gas.

[0044] The separation assembly introduces the second baffle plate 10, the first filter layer 11 and the second filter layer 12, realizes multi-stage filtration of the oil-containing gas, and if the lubricating oil also moves upward to the position of the filter layer due to large speed, the lubricating oil will also be intercepted by the filter layer and re-dropped and collected in the oil channel, so that the high-efficiency and reliable oil separation is ensured.

[0045] On the basis of the embodiment, the preferred scheme is that the first baffle plate 8 and the second baffle plate 10 are vertically arranged, the top of the first baffle plate 8 is spaced apart from the inner top surface of the oil section 4, and the bottom of the second baffle plate 10 is spaced apart from the oil channel of the oil section 4. The vertically arranged baffle plate can change the direction and speed of the airflow, so that the oil droplets are more easily separated from the airflow due to the inertial effect and settled in the oil channel 9 or the bottom of the oil separator 1, and the upper and lower staggered arrangement of the first baffle plate 8 and the second baffle plate 10 actually prolongs the flow path of the airflow in the oil section 4, increases the opportunity of separation of the oil droplets from the airflow, and improves the separation efficiency.

[0046] Specifically, the air flow can gradually slow down when passing through the top region of the first baffle 8, which is conducive to the oil droplets being separated from the air flow due to inertia, and then falling into the oil channel 9, effectively reducing the phenomenon of oil droplet re-entrainment caused by excessive air flow speed. When the air flow passes around the bottom region of the second baffle 10, the change in speed and direction helps to throw more oil droplets out of the air flow, allowing them to fall smoothly into the oil channel 9, enhancing the oil separation effect.

[0047] As shown in Figure 1 In some feasible embodiments of the present application, the separation assembly further comprises an oil baffle 13, which is laid at the lower part of the oil section 4 to form an oil channel 9 capable of temporarily storing oil. The main function of the oil baffle 13 is to receive the oil falling from the separation assembly (such as the first baffle, the second baffle, the first filter layer and the second filter layer). These oil droplets are gradually separated from the air flow during the separation process and slide down the surface of the baffle or filter layer under the action of gravity to the oil baffle 13, and then flow into the oil channel 9 at the bottom of the oil section 4 from the oil baffle 13.

[0048] During the oil separation process, if the oil directly falls into the bottom of the oil separator 1 without any buffering or guiding, it is likely to cause splashing, causing the oil to re-mix into the air flow and causing secondary pollution. The presence of the oil baffle 13 can effectively prevent this splashing phenomenon from occurring, ensuring that the oil flows smoothly and orderly into the oil channel, thereby improving the purity and efficiency of oil separation.

[0049] Based on this embodiment, a preferred solution is that the oil baffle 13 is provided with oil grooves, and the oil falls into the oil channel from the oil grooves. The design of the oil grooves can guide the oil to flow along a specific path, ensuring that the oil smoothly slides off the separation assembly and flows into the oil channel 9. This design avoids the disorderly diffusion and retention of oil on the oil baffle 13, improving the efficiency and orderliness of oil flow.

[0050] As shown in Figure 1 , 2 In the preferred embodiment of the present application, the oil separator 1 further comprises a secondary oil tank 15, which is connected to the oil channel 9 of the oil section 4 through an oil outlet pipe 14. The secondary oil tank 15 serves as an additional storage unit of the oil separator 1, which can increase the oil storage capacity of the oil separator 1, making the oil separator 1 more flexible and adaptable in different working conditions and flow requirements. The secondary oil tank 15 is fixedly welded to the shell 2 by a fixed support, so that the secondary oil tank 15 and the oil separator 1 are connected as a whole. The oil separator 1 can be used as a modular component for combination, for example, in a large refrigeration unit, each compressor 16 is equipped with the oil separator 1.

[0051] As shown in Figure 1As shown, the sound attenuation section 3 and the oil separation section 4 are particularly suitable for the horizontally placed oil separator 1, and specifically, the shell is cylindrical and horizontally placed, the inner cavity of the shell 2 is divided into the sound attenuation section 3 and the oil separation section 4 along the axial direction, the outer end surface of the sound attenuation section 3 is provided with the air inlet 5, and the top of the oil separation section 4 is provided with the air outlet 6. The horizontally placed oil separator 1 makes the flow path of the sound attenuation section 3 relatively long, and the sound waves can be absorbed, reflected or dissipated in the sound attenuation section 3, so that the noise level is reduced.

[0052] In actual application, the high-temperature and high-pressure gas discharged by the compressor 16 impacts the first baffle 8 after passing through the sound attenuation section 3, at this time, the refrigerant gas flows to the first filter flow channel due to small density, continues to advance after passing through the first filter layer 11, flows to the second filter flow channel, continues to rise after passing through the second filter layer 12, and finally flows out of the oil separator 1 through the air outlet 6. The lubricating oil in the airflow is intercepted by the filter layer, falls on the oil baffle 13 under the action of gravity, and then falls into the oil channel 9 from the oil groove of the oil baffle 13 and enters the auxiliary oil storage tank 15 through the oil outlet pipe 14.

[0053] This design fully utilizes the inner cavity of the oil separator 1, can not only obviously improve the sound attenuation effect, but also optimize the oil separation efficiency, and has compact structure and small size.

[0054] As shown in the drawings, Figures 3 to 5 The utility model discloses further proposed refrigerating unit, include: compressor 16 and above-mentioned oil separator 1, the air inlet 5 of oil separator 1 is connected the exhaust port of compressor 16, and compressor 16 includes but is not limited to screw compressor, piston compressor etc.

[0055] In some feasible embodiments, the refrigerating unit contains total oil storage tank 17 and multiple parallel compressors 16, each compressor 16 is provided with an oil separator 1, the auxiliary oil storage tank 15 of oil separator 1 is connected total oil storage tank 17 through auxiliary oil return pipe 18, and total oil storage tank 17 is connected each compressor 16 through oil return branch pipe 19. Since large total oil separation device needs larger installation space, application scene is very limited, and this design cancels traditional large total oil separation device, is provided with small volume and installation flexible oil separator 1 for each compressor 16, can save installation space, and reduce the manufacturing and installation cost of unit.

[0056] As shown in the drawings, Figure 4 The refrigerant flows as follows: the refrigerant flowing out of the evaporator passes through the suction manifold 22, flows through each compressor 16 for compression, becomes high-temperature and high-pressure refrigerant gas after completing compression, enters the corresponding exhaust pipe, and enters the oil separator through the exhaust pipe. Since the noise at the exhaust port of the compressor 16 is the largest, the oil separator 1 is arranged near the exhaust port of the compressor 16 to improve the sound attenuation effect. After the refrigerant gas passes through the oil separator 1, it enters the exhaust manifold 23 and then enters the subsequent condensing components for heat exchange.

[0057] As shown in Figure 5 The oil circulation process is as follows: the mixture of working medium and refrigeration oil enters the corresponding exhaust pipe through the compressor 16, is separated in the oil separator 1, the refrigeration oil is separated into the auxiliary oil tank 15, and then flows back to the total oil tank 17 through the auxiliary oil return pipe 18, and then the oil is taken from the total oil tank 17 and then returned to the compressor 16 again through the oil return branch pipe 19 for lubrication.

[0058] In order to optimize the oil circulation state, the liquid level sensor is installed on the auxiliary oil tank 15 and the total oil tank 17, the auxiliary oil return valve 20 is installed on the auxiliary oil return pipe 18, the auxiliary oil return valve 20 controls the opening and closing of the auxiliary oil return pipe 18, and the compressor 16 needs to be supplied with refrigeration oil during operation, so the auxiliary oil return valve 20 is opened and closed with the corresponding compressor 16. When the compressor 16 is started, the auxiliary oil return valve 20 of the oil separator 1 is opened, and when the compressor 16 is closed, the corresponding auxiliary oil return valve 20 of the oil separator 1 is disconnected, so as to ensure the basic oil supply of the unit operation. In the parallel unit, since the conditions of each branch are not the same, the total oil tank 17 needs to be set to distribute and dispatch the refrigeration oil in the whole system, so the adjusting valve 21 is installed on the oil return branch pipe 19, the adjusting valve 21 can adopt a proportional integral valve with high control precision, and the controller of the refrigeration unit receives the detection data of the liquid level sensor and controls the opening degree of the auxiliary oil return valve 20 and the adjusting valve 21.

[0059] Through a large number of experiments, it is verified that the oil level of the compressor 16 has an optimal interval, since the oil separator 1 is directly connected with the exhaust port of the compressor 16, by detecting the actual oil level of the auxiliary oil tank 15, it is judged whether the current refrigeration oil amount of the compressor meets the use requirement, that is, when the actual oil level of the auxiliary oil tank 15 is in the interval [P1, P2], the compressor 16 is in the optimal oil level state, if the actual oil level of the auxiliary oil tank 15 is higher than the interval, too much lubricating oil affects heat exchange, and if the actual oil level of the auxiliary oil tank 15 is lower than the interval, the lubricating oil is insufficient, and the compressor 16 has a risk of operation. In addition, the oil level of the total oil tank 17 is set to have a minimum oil level value X1, and if it is lower than X1, it indicates that the current oil level is too low, and the unit alarms.

[0060] In order to facilitate understanding, an application example of the utility model is taken as an example for illustration, the liquid level sensor detection value of the auxiliary oil tank 15 is P, and the liquid level sensor detection value of the total oil tank 17 is X.

[0061] When the unit is normally operated, the P value of each path corresponding to the started compressor 16 is detected, whether the P value is in the interval [P1, P2] is detected, if yes, no adjustment is performed, and whether the liquid level X value of the total oil tank 17 is lower than X1 is detected, if not, no adjustment is performed.

[0062] The adjustment process is as follows:

[0063] If the P value of a branch is less than P1, it is determined whether the P value of another branch is in the interval [P1, P2], and if not, the liquid level X of the total oil tank 17 is detected, and if the X value is less than X1, the unit has oil running phenomenon, or the refrigeration system has leakage and oil leakage, and the unit alarms and stops to protect the compressor 16.

[0064] If the P value of a branch is less than P1, it is determined whether the P value of another branch is in the interval [P1, P2], and if not, the liquid level X of the total oil tank 17 is detected, and if the X value is less than X1, the unit has oil running phenomenon, or the refrigeration system has leakage and oil leakage, and the unit alarms and stops to protect the compressor 16.

[0065] If the P value of a branch is greater than P1, it means that the branch has too much lubricating oil, and the regulating valve 21 of the branch is closed to balance the oil circuit.

[0066] It should be understood that the compressor and the corresponding oil separator as a branch, the P value of the branch is controlled by changing the regulating valve on the oil return branch of the compressor. After each detection, continue to detect after a certain time (for example, 5 seconds), and repeat the judgment.

[0067] It should be noted that the terms used above are only intended to describe particular embodiments and are not intended to limit exemplary embodiments according to the present application. When the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or combinations thereof are present. The order of the actions, steps, etc. in the devices and methods shown in the specification and drawings can be implemented in any order, as long as the output of the previous processing is not used in the subsequent processing, unless the order is specifically limited. The use of similar ordinal terms does not mean that the order must be implemented.

[0068] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods, and devices should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0069] The above description is only the preferred embodiment of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. Oil separator, characterized in that The oil separator comprises: a housing, an inner cavity of which is divided into a silencing section with an air inlet and an oil separation section with an air outlet; an inner shell mounted in the silencing section, a side wall of the inner shell being provided with silencing holes, an inlet end of the inner shell being communicated with the air inlet and an outlet end of the inner shell being communicated with the oil separation section; a separation assembly mounted above an oil channel of the oil separation section, the separation assembly comprising a first baffle plate opposite to the outlet end of the inner shell.

2. The oil separator of claim 1, wherein The separation assembly further comprises: a second baffle plate divided between the air outlet and the first baffle plate, a region between the first baffle plate and the second baffle plate being a first filtering flow channel and a region between the second baffle plate and the air outlet being a second filtering flow channel; a first filtering layer shielded in the first filtering flow channel; a second filtering layer shielded in the second filtering flow channel.

3. The oil separator of claim 2, wherein The first baffle plate and the second baffle plate are both vertically arranged, a top of the first baffle plate being spaced apart from an inner top surface of the oil separation section and a bottom of the second baffle plate being spaced apart from the oil channel of the oil separation section.

4. The oil separator of claim 1, wherein The separation assembly further comprises: an oil baffle plate for receiving oil falling from the separation assembly, the oil baffle plate being laid at a lower portion of the oil separation section to form the oil channel of the oil separation section.

5. The oil separator of claim 4, wherein The oil baffle plate is provided with oil grooves, oil falling from the oil grooves into the oil channel.

6. The oil separator of claim 1, wherein The oil separator further comprises a secondary oil storage tank communicated with the oil channel of the oil separation section through an oil outlet pipe, the secondary oil storage tank being fixedly mounted outside the housing.

7. The oil separator according to any one of claims 1 to 6, characterized in that The housing is in a cylindrical shape and horizontally placed, an inner cavity of the housing being divided into the silencing section and the oil separation section along an axial direction, an outer end surface of the silencing section being provided with the air inlet and a top of the oil separation section being provided with the air outlet.

8. A refrigeration unit characterized by, The oil separator is connected to an exhaust outlet of a compressor. The refrigeration unit comprises a total oil storage tank and a plurality of parallel compressors, each of the compressors being provided with the oil separator, the secondary oil storage tank of the oil separator being connected to the total oil storage tank through a secondary oil return pipe, the total oil storage tank being connected to each of the compressors through an oil return branch pipe.

9. The refrigeration unit of claim 8, wherein, The secondary oil storage tank and the total oil storage tank are both provided with liquid level sensors, the secondary oil return pipe is provided with a secondary oil return valve and the oil return branch pipe is provided with an adjusting valve.

10. The refrigeration unit of claim 9, wherein, The controller of the refrigeration unit receives detection data of the liquid level sensors and controls opening degrees of the secondary oil return valve and the adjusting valve. ​

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