Vertical oil-gas separation device and screw water chiller

Abstract

The application provides a vertical oil-gas separation device and a screw water chiller. The vertical oil-gas separation device comprises a shell, a first inner cylinder, an air inlet pipe, an air outlet pipe and a spiral plate. The first inner cylinder is arranged in the interior of the shell. The air inlet pipe is arranged at the lower end of the shell. One end of the air inlet pipe penetrates through the shell and is communicated with the lower end of the first inner cylinder. The air outlet pipe is arranged in the interior of the shell. The air outlet pipe extends along the up-down direction and the lower end thereof extends out of the shell. The first inner cylinder is arranged around the outer periphery of the air outlet pipe. The spiral plate is arranged in the interior of the first inner cylinder. The spiral plate spirally winds around the central axis of the air outlet pipe. The application can reduce the mass gravity center of the vertical oil-gas separation device, reduce the vibration influence of the gas impact, and thus the vibration is small during operation.

Description

Technical Field

[0001] This application belongs to the technical field of screw chillers, and particularly relates to a vertical oil-gas separation device and a screw chiller. Background Technology

[0002] An oil-gas separator is an auxiliary device in a refrigeration system. It is usually installed between the compressor outlet and the condenser to separate oil from the high-pressure gas discharged from the compressor.

[0003] like Figure 12 As shown, traditional vertical oil-gas separators 10' typically have a top-in, top-out structure, meaning the medium (a mixture of gas and oil) enters from the top of the oil-gas separator, and the gas after oil separation exits from the top of the oil-gas separator. This structure results in a high center of gravity for the oil-gas separator, making it susceptible to vibration from gas impacts, leading to significant vibration during operation. Utility Model Content

[0004] This application provides a vertical oil-gas separator and a screw chiller to solve the problem that the existing vertical oil-gas separator has a high center of gravity and vibrates significantly during operation.

[0005] In a first aspect, embodiments of this application provide a vertical oil-gas separator, comprising a housing, a first inner cylinder, an inlet pipe, an outlet pipe, and a spiral plate. The first inner cylinder is disposed inside the housing, the inlet pipe is disposed at the lower end of the housing, one end of the inlet pipe passes through the housing and communicates with the lower end of the first inner cylinder; the outlet pipe is disposed inside the housing, the outlet pipe extends in a vertical direction and its lower end extends outside the housing, and the first inner cylinder surrounds the outer periphery of the outlet pipe; the spiral plate is disposed inside the first inner cylinder, and the spiral plate is spirally wound around the central axis of the outlet pipe.

[0006] Optionally, the vertical oil-gas separator further includes a second inner cylinder, which is disposed inside the shell and above the first inner cylinder, and the inner diameter of the second inner cylinder gradually increases from top to bottom.

[0007] Optionally, the vertical oil-gas separator further includes a baffle, which is located below the first inner cylinder and the gas outlet pipe passes through the baffle. A gap is provided between the edge of the baffle and the inner wall of the housing.

[0008] Optionally, the edge of the baffle is connected to the inner wall of the housing, and the edge of the baffle is provided with a notch; and / or, the baffle is provided with a second through hole.

[0009] Optionally, the pitch of the spiral plate gradually decreases from bottom to top; and / or, the inner diameter of the first inner cylinder gradually decreases from bottom to top, and the outer diameter of the spiral plate gradually decreases from bottom to top.

[0010] Optionally, a gap is provided between the shell and the first inner cylinder, and a first through hole is provided on the side wall of the first inner cylinder.

[0011] Optionally, the end face of the air inlet pipe that communicates with the first inner cylinder is lower than the upper end face of the air outlet pipe.

[0012] Optionally, the housing includes an outer cylinder, an upper end cover, and a lower end cover, the upper end cover and the lower end cover being detachably disposed on the top opening and bottom opening of the outer cylinder, respectively; the lower end of the outer cylinder is provided with a plurality of support legs, the plurality of support legs being distributed at intervals along the circumference of the outer cylinder.

[0013] Optionally, the lower end of the housing is provided with an oil outlet pipe, which passes through the housing; and / or, the lower end of the housing is provided with a sight glass; and / or, the lower end of the housing is provided with a blind tube for inserting an electric heating element; and / or, the lower end of the housing is provided with a connector for connecting an oil level switch or a temperature sensor.

[0014] Secondly, embodiments of this application also provide a screw chiller, which includes the aforementioned vertical oil-gas separator.

[0015] The vertical oil-gas separator and screw chiller provided in this application embodiment, by setting the air inlet pipe at the lower end of the shell and communicating with the lower end of the first inner cylinder, and the air outlet pipe extending vertically inside the shell with its lower end extending outside the shell, allows the medium (i.e., a mixture of gas and oil) to enter from the lower end of the oil-gas separator, and the gas after oil separation to be discharged from the lower end of the oil-gas separator. This lowers the center of gravity of the vertical oil-gas separator, reduces the vibration impact of gas impact, and thus results in less vibration during operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without creative effort. In the following description, the same reference numerals denote the same parts.

[0017] Figure 1 This is a schematic diagram of the structure of the vertical oil-gas separator provided in the embodiments of this application.

[0018] Figure 2 for Figure 1The diagram shows a longitudinal cross-sectional view of the vertical oil-gas separator.

[0019] Figure 3 for Figure 2 A cross-sectional schematic diagram of the vertical oil-gas separator shown from another perspective.

[0020] Figure 4 for Figure 3 This is a cross-sectional schematic diagram of the vertical oil-gas separator from another perspective.

[0021] Figure 5 for Figure 4 One of the schematic diagrams of a partial structure of a vertical oil-gas separator shown.

[0022] Figure 6 for Figure 4 The second partial structural schematic diagram of the vertical oil-gas separator shown.

[0023] Figure 7 This is a schematic diagram of the structure of the first inner cylinder provided in an embodiment of this application.

[0024] Figure 8 This is a schematic diagram of the spiral plate provided in an embodiment of this application.

[0025] Figure 9 This is a schematic diagram of the structure of the second inner cylinder provided in an embodiment of this application.

[0026] Figure 10 This is a schematic diagram of the structure of the baffle provided in an embodiment of this application.

[0027] Figure 11 This is a schematic diagram of the screw chiller provided in an embodiment of this application.

[0028] Figure 12 This is a schematic diagram of the structure of a screw chiller in the prior art.

[0029] Explanation of icon numbers: 10. Vertical oil-gas separator; 20. Piping; 100. Shell; 110. Outer cylinder; 120. Upper end cover; 130. Lower end cover; 140. Support leg; 200. First inner cylinder; 201. First through hole; 202. Air inlet; 310. Air inlet pipe; 311. First flange; 320. Air outlet pipe; 321. Second flange; 400. Spiral plate; 401. Spiral flow channel; 500. Second inner cylinder; 600. Baffle; 601. Notch; 602. Second through hole; 710. Oil outlet pipe; 720. Sight glass; 730. Blind pipe; 740. Connector. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this application, the term "exemplary" is used to mean "used as an example, illustration, or illustration." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] This application provides a vertical oil-gas separator 10, such as... Figures 1-10 As shown, the vertical oil-gas separator 10 includes a housing 100, a first inner cylinder 200, an inlet pipe 310, an outlet pipe 320, and a spiral plate 400. The first inner cylinder 200 is disposed inside the housing 100. The inlet pipe 310 is disposed at the lower end of the housing 100, with one end passing through the housing 100 and communicating with the lower end of the first inner cylinder 200. The outlet pipe 320 is disposed inside the housing 100, extending vertically and with its lower end extending outside the housing 100. The first inner cylinder 200 surrounds the outer periphery of the outlet pipe 320. The spiral plate 400 is disposed between the first inner cylinder 200 and the outlet pipe 320, and the spiral plate 400 is spirally wound around the central axis A of the outlet pipe 320.

[0034] The vertical oil-gas separator 10 provided in this application embodiment has an inlet pipe 310 located at the lower end of the housing 100 and connected to the lower end of the first inner cylinder 200, and an outlet pipe 320 extending vertically inside the housing 100 with its lower end extending outside the housing 100. This allows the medium (i.e., a mixture of gas and oil) to enter from the lower end of the oil-gas separator, and the gas after oil separation to exit from the lower end of the oil-gas separator, forming a bottom-in, bottom-out structure. This lowers the center of gravity of the vertical oil-gas separator, reduces the vibration impact of gas impact, and thus results in less vibration during operation.

[0035] In some embodiments of this application, the housing 100 includes an outer cylinder 110, an upper end cover 120, and a lower end cover 130. The outer cylinder 110 has openings at both its top and bottom. The upper end cover 120 and the lower end cover 130 are detachably fitted onto the top and bottom openings of the outer cylinder 110, respectively. This arrangement facilitates the installation of components such as the first inner cylinder 200, the air inlet pipe 310, the air outlet pipe 320, and the spiral plate 400 inside the outer cylinder 110. The lower end of the outer cylinder 110 is provided with multiple support legs 140, which are spaced apart circumferentially along the outer cylinder 110. The vertical oil-gas separator 10 can be fixed to the outside environment via the support legs 140.

[0036] Specifically, the outer cylinder 110, the first inner cylinder 200, and the vent pipe 320 are coaxially arranged, with the lower end of the vent pipe 320 extending through the lower end cover 130 to the outside of the outer cylinder 110. The first inner cylinder 200 has openings at both its top and bottom. Specifically, the inner wall of the first inner cylinder 200, the spiral plate 400, and the outer wall of the vent pipe 320 form a spiral flow channel 401 for media flow. When the medium requiring oil-gas separation (i.e., gas mixed with oil) enters the first inner cylinder 200 through the inlet pipe 310, the medium can spiral upwards along the spiral flow channel 401. During this spiral motion, due to centrifugal force, the medium separates into oil and gas; that is, the oil mixed in the gas is separated out. The separated oil flows out from the bottom opening of the first inner cylinder 200, while the separated gas is discharged from the vent pipe 320 to the outside of the shell 100.

[0037] Optionally, the end face of the inlet pipe 310 that connects to the first inner cylinder 200 is lower than the upper end face of the outlet pipe 320. This arrangement ensures that the oil-mixed gas can be better separated after entering the first inner cylinder 200 and then discharged from the outlet pipe 320. Specifically, the lower side wall of the first inner cylinder 200 is provided with an inlet port 202, and one end of the inlet pipe 310 is connected to the inlet port 202 so that the inlet pipe 310 communicates with the interior of the first inner cylinder 200.

[0038] In some embodiments of this application, a gap is provided between the shell 100 and the first inner cylinder 200, and a first through hole 201 is provided on the side wall of the first inner cylinder 200, such as... Figure 7 As shown. This design facilitates the rapid removal of oil separated in the spiral flow channel 401, thereby reducing resistance. Specifically, under the action of centrifugal force, a portion of the separated oil is thrown out from the first through hole 201, and then flows downward along the inner wall of the shell 100 and the outer wall of the second inner cylinder 500 under the action of gravity, finally converging at the bottom of the shell 100.

[0039] Specifically, multiple first through holes 201 are evenly distributed on the side wall of the first inner cylinder 200, and the diameter of the first through holes 201 can be 5 mm. For example, as shown... Figure 7 As shown, multiple first through holes 201 can be set to be divided into at least two groups along the axial direction of the first inner cylinder 200, and multiple first through holes 201 in the same group are evenly distributed along the circumference of the first inner cylinder 200.

[0040] In some embodiments of this application, such as Figures 2-4 , Figure 6 and Figure 8 As shown, the pitch of the spiral plate 400 gradually decreases from bottom to top. The pitch of the spiral plate 400 is the axial distance between corresponding points on adjacent spiral lines of the spiral plate 400. By setting the pitch of the spiral plate 400 to gradually decrease from bottom to top, the cross-sectional area of ​​the spiral flow channel 401 gradually decreases from bottom to top. When the medium flows in the flow channel with a gradually decreasing cross-sectional area, the flow velocity can be increased, and the centrifugal force can be increased, thereby improving the oil-gas separation effect and enhancing the overall oil-gas separation efficiency.

[0041] Optionally, the inner diameter of the first inner cylinder 200 gradually decreases from bottom to top, and the outer diameter of the spiral plate 400 also gradually decreases from bottom to top. The outer diameter of the spiral plate 400 refers to its maximum diameter. This configuration further reduces the cross-sectional area of ​​the spiral flow channel 401 from bottom to top, thereby more effectively increasing the medium flow velocity at a given medium flow rate, increasing centrifugal force, further optimizing the oil-gas separation effect, and improving the overall oil-gas separation efficiency.

[0042] Specifically, the first inner cylinder 200 is a tapered cylinder that is smaller at the top and larger at the bottom. For example, the first inner cylinder 200 can be a frustum structure that is smaller at the top and larger at the bottom. The outer periphery of the spiral plate 400 is in contact with the inner wall of the first inner cylinder 200 and is tapered.

[0043] In some embodiments of this application, such as Figures 2-5 and Figure 9As shown, the vertical oil-gas separator 10 also includes a second inner cylinder 500, which is disposed inside the housing 100 and above the first inner cylinder 200. The inner diameter of the second inner cylinder 500 gradually increases from top to bottom. By providing the second inner cylinder 500 with the above-described structure above the first inner cylinder 200, the second inner cylinder 500 can gather the gas from the outer high-speed, high-pressure zone to the middle low-pressure zone so that the gas can be discharged from the outlet pipe 320; moreover, a portion of the separated oil will also flow down along the side wall of the second inner cylinder 500 to the bottom of the housing 100.

[0044] Understandably, after the oil-mixed gas is centrifugally separated from the oil in the spiral flow channel 401, the gas exits from the first inner cylinder 200 and is thrown towards the inner wall of the shell 100. At this time, the area near the inner wall of the shell 100 is a high-pressure area, and the middle of the shell 100 is a low-pressure area. Without the second inner cylinder 500, the gas would have to go through various collisions before finally flowing from the high-pressure area to the low-pressure area, which would cause a lot of internal pressure loss. This application solves this problem by setting up a second inner cylinder 500, whose inner wall surface forms a gas reflector, which can gather the gas from the high-pressure area to the low-pressure area, thereby improving the gas reflux efficiency and significantly reducing internal pressure loss.

[0045] Specifically, the second inner cylinder 500 is coaxially arranged with the outer cylinder 110, the first inner cylinder 200, and the gas outlet pipe 320. The second inner cylinder 500 has openings at both its top and bottom. The top opening of the second inner cylinder 500 is sealed by the upper end cover 120. At this time, the bottom surface of the upper end cover 120 also forms a gas reflective surface, which can gather gas from the high-pressure area to the low-pressure area. Optionally, the second inner cylinder 500 is a tapered cylinder, wider at the top and narrower at the bottom; for example, the second inner cylinder 500 can be a frustum structure, narrower at the top and wider at the bottom.

[0046] In some embodiments of this application, such as Figures 2-4 and Figure 6 As shown, the vertical oil-gas separator 10 also includes a baffle 600, which is located below the first inner cylinder 200 and through which the gas outlet pipe 320 passes. A gap is provided between the edge of the baffle 600 and the inner wall of the housing 100. By setting the baffle 600, its top surface forms a gas reflector, which can concentrate the medium in the outer high-speed, high-pressure zone towards the middle low-pressure zone, thereby further improving gas reflux efficiency and reducing internal pressure loss. The gap between the edge of the baffle 600 and the inner wall of the housing 100 facilitates the flow of separated oil downwards to the bottom of the housing 100 for subsequent processing.

[0047] Optionally, the edge of the baffle 600 is connected to the inner wall of the housing 100, and the edge of the baffle 600 is provided with a notch 601, such as... Figure 10As shown. This configuration allows the baffle 600 to be stably installed inside the housing 100, while the notch 601 creates a gap between the edge of the baffle 600 and the inner wall of the housing 100, allowing the separated oil to flow downwards to the bottom of the housing 100. Specifically, multiple notches 601 can be provided along the edge of the baffle 600 (e.g., Figure 10 There are four gaps 601 in the middle), and multiple gaps 601 are evenly distributed along the circumference of the baffle 600.

[0048] Optional, such as Figure 10 As shown, the baffle 600 is provided with a second through hole 602. By providing the second through hole 602 on the baffle 600, it is beneficial for the oil flowing out from the bottom opening of the first inner cylinder 200 to flow downward to the bottom of the housing 100, so as to facilitate subsequent processing. For example, as shown... Figure 10 As shown, multiple second through holes 602 can be provided in at least two groups along the radial direction of the baffle 600, and multiple second through holes 602 in the same group are evenly distributed along the circumference of the baffle 600.

[0049] Specifically, the separated oil collects in an oil sump at the bottom of the housing 100. A level sensor is typically installed at the lower end of the housing 100 to detect the oil level in the sump, allowing for timely discharge of oil when the level exceeds a preset value. It is understood that after the medium is separated into gas and oil by the spiral flow channel 401, the baffle 600 can isolate the gas from the oil collected at the bottom of the housing 100, reducing the influence of the swirling gas field on the oil, making the oil sump more stable, and thus improving the sensing accuracy of the level sensor.

[0050] In some embodiments of this application, such as Figure 4 As shown, an oil outlet pipe 710 is provided at the lower end of the housing 100, and the oil outlet pipe 710 passes through the housing 100. By providing the oil outlet pipe 710, the oil collected at the bottom of the housing 100 can flow out through the oil outlet pipe 710.

[0051] Optional, such as Figure 1 As shown, a sight glass 720 is provided at the lower end of the housing 100, which serves as a window for observing the oil level at the bottom of the housing 100.

[0052] Optional, such as Figures 2-4 As shown, the lower end of the housing 100 is provided with a blind tube 730 for inserting an electric heater (also known as a high-frequency heater). When the temperature is low, an electric heater can be inserted into the blind tube 730 to heat the oil at the bottom of the housing 100 so that the oil at the bottom of the housing 100 can flow out.

[0053] Optional, such as Figure 1 , Figure 3 and Figure 4As shown, the lower end of the housing 100 is provided with a connector 740 for connecting an oil level switch or a temperature sensor. Specifically, an oil level switch can be connected through the connector 740 to control the operating state of the vertical oil-gas separator 10; or, a temperature sensor can be connected through the connector 740 to detect the temperature of the oil collected at the bottom of the housing 100.

[0054] In some embodiments of this application, such as Figures 1-4 As shown, the intake pipe 310 is provided with a first flange 311 at one end outside the housing 100. The first flange 311 is used to connect and fix the intake pipe 310 to the external pipe. The exhaust pipe 320 is provided with a second flange 321 at one end outside the housing 100. The second flange 321 is used to connect and fix the exhaust pipe 320 to the external pipe.

[0055] This application also provides a screw chiller, such as... Figure 11 As shown, the screw chiller includes a vertical oil-gas separator 10, the specific structure of which is described in the above embodiments. Since this screw chiller employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0056] Furthermore, the screw chiller, by employing the vertical oil-gas separator 10 of this application, compared to the conventional vertical oil-gas separator 10' with its top-inlet and top-outlet structure (such as...), Figure 12 As shown), the vertical oil-gas separator 10 of this application has a bottom-in, bottom-out structure (as shown). Figure 11 (As shown) This can shorten the length of the pipes 20 required to connect the inlet pipe 310 and outlet pipe 320 to other components in the screw chiller, thereby reducing the material of the pipes 20 used in the assembly of the screw chiller, making the screw chiller more economical and improving product competitiveness.

[0057] In summary, the vertical oil-gas separator 10 provided in this application can improve oil-gas separation efficiency, optimize internal pressure loss, improve oil level detection accuracy, reduce overall machine vibration and manufacturing costs, and significantly improve the overall performance of the vertical oil-gas separator 10. At the same time, it improves the reliability and economy of the screw chiller using the vertical oil-gas separator 10.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0059] The vertical oil-gas separator and screw chiller provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A vertical oil-gas separator, characterized in that, The vertical oil-gas separator (10) includes: Casing (100); The first inner cylinder (200) is disposed inside the shell (100); An air inlet pipe (310) is disposed at the lower end of the housing (100), and one end of the air inlet pipe (310) passes through the housing (100) and communicates with the lower end of the first inner cylinder (200); An exhaust pipe (320) is disposed inside the housing (100). The exhaust pipe (320) extends in the vertical direction and its lower end extends out of the housing (100). The first inner cylinder (200) surrounds the outer periphery of the exhaust pipe (320). A spiral plate (400) is disposed inside the first inner cylinder (200), and the spiral plate (400) is spirally wound around the central axis of the air outlet pipe (320).

2. The vertical oil-gas separator according to claim 1, characterized in that, The vertical oil-gas separator (10) further includes a second inner cylinder (500), which is disposed inside the housing (100) and above the first inner cylinder (200). The inner diameter of the second inner cylinder (500) gradually increases from top to bottom.

3. The vertical oil-gas separator according to claim 2, characterized in that, The vertical oil-gas separator (10) further includes a baffle (600), which is located below the first inner cylinder (200) and the gas outlet pipe (320) passes through the baffle (600). A gap is provided between the edge of the baffle (600) and the inner wall of the housing (100).

4. The vertical oil-gas separator according to claim 3, characterized in that, The edge of the baffle (600) is connected to the inner wall of the housing (100), and the edge of the baffle (600) is provided with a notch (601); And / or, the baffle (600) is provided with a second through hole (602).

5. The vertical oil-gas separator according to claim 1, characterized in that, The pitch of the spiral plate (400) gradually decreases from bottom to top; And / or, the inner diameter of the first inner cylinder (200) gradually decreases from bottom to top, and the outer diameter of the spiral plate (400) gradually decreases from bottom to top.

6. The vertical oil-gas separator according to claim 1, characterized in that, A gap is provided between the shell (100) and the first inner cylinder (200), and a first through hole (201) is provided on the side wall of the first inner cylinder (200).

7. The vertical oil-gas separator according to claim 1, characterized in that, The end face of the air inlet pipe (310) that is connected to the first inner cylinder (200) is lower than the upper end face of the air outlet pipe (320).

8. The vertical oil-gas separator according to claim 1, characterized in that, The housing (100) includes an outer cylinder (110), an upper end cover (120), and a lower end cover (130). The upper end cover (120) and the lower end cover (130) are detachably installed on the top opening and bottom opening of the outer cylinder (110), respectively. The lower end of the outer cylinder (110) is provided with a plurality of legs (140), which are distributed at intervals along the circumference of the outer cylinder (110).

9. The vertical oil-gas separator according to claim 1, characterized in that, The lower end of the housing (100) is provided with an oil outlet pipe (710), which passes through the housing (100); And / or, the lower end of the housing (100) is provided with a sight glass (720); And / or, the lower end of the housing (100) is provided with a blind tube (730) for inserting an electric heating element; And / or, the lower end of the housing (100) is provided with a connector (740) for connecting an oil level switch or a temperature sensor.

10. A screw chiller, characterized in that, The screw chiller includes the vertical oil-gas separator (10) as described in any one of claims 1 to 9.

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