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 and the air outlet pipe are arranged in the interior of the shell. The air inlet pipe is arranged in the shell and is communicated with the upper end of the first inner cylinder. The air outlet pipe extends along the up-down direction and the upper end 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 is spirally wound around the central axis of the air outlet pipe. The pitch of the spiral plate gradually decreases from top to bottom. The vertical oil-gas separation device can improve the medium flow rate, increase the centrifugal force, so that the oil-gas separation effect is better and the overall oil-gas separation efficiency is improved.

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] Vertical cyclone oil-gas separators commonly used in the refrigeration industry consist of an outer cylinder and an inner cylinder. The medium discharged from the compressor (a mixture of high-pressure gas and oil) enters the oil-gas separator. In the flow channel between the outer and inner cylinders, the centrifugal force generated by high-speed rotation throws small oil molecules onto the inner wall of the outer cylinder, forming liquid oil droplets. These liquid oil droplets then slide down the inner wall of the outer cylinder to the bottom of the oil-gas separator, forming an oil pool. In this technical solution, the cross-sectional area of ​​the flow channel remains constant, leading to a decrease in the medium flow velocity at low flow rates, resulting in a poorer oil-gas separation effect and thus reducing the oil-gas separation efficiency. Utility Model Content

[0004] This application provides a vertical oil-gas separator and a screw chiller to solve the problem that existing vertical oil-gas separators suffer from reduced medium flow rate and poorer oil-gas separation effect at low flow rates.

[0005] In a first aspect, embodiments of this application provide a vertical oil-gas separator, the vertical oil-gas separator comprising a shell, a first inner cylinder, an inlet pipe, an outlet pipe, and a spiral plate, wherein the first inner cylinder and the outlet pipe are both disposed inside the shell; the inlet pipe passes through the shell and communicates with the upper end of the first inner cylinder, the outlet pipe extends in a vertical direction and its upper end extends outside the shell, the first inner cylinder surrounds the outer periphery of the outlet pipe; the spiral plate is disposed inside the first inner cylinder, the spiral plate is spirally wound around the central axis of the outlet pipe, and the pitch of the spiral plate gradually decreases from top to bottom.

[0006] Optionally, the inner diameter of the first inner cylinder gradually decreases from top to bottom, and the outer diameter of the spiral plate gradually decreases from top to bottom.

[0007] Optionally, the vertical oil-gas separator further includes a second inner cylinder, which is disposed inside the shell and located below the first inner cylinder, and the inner diameter of the second inner cylinder gradually decreases from top to bottom.

[0008] Optionally, a gap is provided between the outer wall of the second inner cylinder and the inner wall of the shell.

[0009] Optionally, the vertical oil-gas separator further includes a baffle plate, which is installed at the lower opening of the second inner cylinder, and a gap is provided between the two sides of the baffle plate and the inner wall of the lower opening of the second inner cylinder.

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

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

[0012] 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.

[0013] Optionally, the housing includes an outer cylinder, an upper end cover, and a lower end cover, wherein the upper end cover and the lower end cover are detachably disposed on the top opening and bottom opening of the outer cylinder, respectively.

[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 connect the air inlet pipe to the upper end of the first inner cylinder, and the spiral plate is set inside the first inner cylinder. The spiral plate spirally winds around the central axis of the air outlet pipe, and the pitch of the spiral plate gradually decreases from top to bottom. This makes the inner wall of the first inner cylinder, the spiral plate and the outer wall of the air outlet pipe form a spiral flow channel for the medium to flow. The cross-sectional area of ​​the spiral flow channel gradually decreases from top to bottom. When a medium with a certain flow rate 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 making the oil-gas separation effect better, improving the overall oil-gas separation efficiency, and ensuring the reliability of oil return of the screw chiller unit. 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 1 The diagram shows a longitudinal cross-sectional view of the vertical oil-gas separator.

[0019] Figure 3 for Figure 2 The diagram shows a partial structural schematic of the vertical oil-gas separator.

[0020] Figure 4 for Figure 2 The diagram shows a structural schematic of the vertical oil-gas separator from another perspective.

[0021] Figure 5 for Figure 4 The diagram shows a partial structural schematic of the vertical oil-gas separator.

[0022] Figure 6 This is a schematic diagram of the structure of the first inner cylinder provided in an embodiment of this application.

[0023] Figure 7 This is a schematic diagram of the spiral plate provided in an embodiment of this application.

[0024] Figure 8 This is a schematic diagram of the structure of the second inner cylinder provided in an embodiment of this application.

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

[0026] Explanation of icon numbers: 100. Shell; 110. Outer cylinder; 120. Upper end cover; 130. Lower end cover; 140. Support leg; 200. First inner cylinder; 201. 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; 510. Second inner cylinder; 520. Baffle; 610. Oil outlet pipe; 620. Sight glass; 630. Blind pipe; 640. Connector. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] This application provides a vertical oil-gas separation device, such as... Figures 1-9 As shown, the vertical oil-gas separator 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 and the outlet pipe 320 are both located inside the housing 100. The inlet pipe 310 passes through the housing 100 and communicates with the upper end of the first inner cylinder 200. The outlet pipe 320 extends vertically and its upper end extends outside the housing 100. The first inner cylinder 200 surrounds the outer periphery of the outlet pipe 320. The spiral plate 400 is located inside the first inner cylinder and spirally coils around the central axis A of the outlet pipe 320, with the pitch of the spiral plate 400 gradually decreasing from top to bottom. The pitch of the spiral plate 400 is the axial distance between corresponding points on adjacent spiral lines of the spiral plate 400.

[0031] The vertical oil-gas separator provided in this application embodiment connects the inlet pipe 310 to the upper end of the first inner cylinder 200, and the spiral plate 400 is disposed inside the first inner cylinder. The spiral plate 400 is spirally wound around the central axis A of the outlet pipe 320, and the pitch of the spiral plate 400 gradually decreases from top to bottom. This makes the inner wall of the first inner cylinder 200, the spiral plate 400 and the outer wall of the outlet pipe 320 form a spiral flow channel 401 for the medium to flow. The cross-sectional area of ​​the spiral flow channel 401 gradually decreases from top to bottom. When a medium with a certain flow rate 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 making the oil-gas separation effect better and improving the overall oil-gas separation efficiency.

[0032] In some embodiments of this application, such as Figures 1-4 As shown, 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 cover 130 also has a support leg 140 at its bottom, allowing the vertical oil-gas separator to be fixed to the outside environment.

[0033] Specifically, the outer cylinder 110, the first inner cylinder 200, and the exhaust pipe 320 are coaxially arranged, with the upper end of the exhaust pipe 320 extending through the upper end cover 120 to the outside of the outer cylinder 110. The first inner cylinder 200 has openings at both its top and bottom, with the top opening sealed by the upper end cover 120. When the medium requiring oil-gas separation (i.e., gas mixed with oil) enters the first inner cylinder 200 through the intake pipe 310, it spirals downwards along the spiral 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. The separated oil flows out from the bottom opening of the first inner cylinder 200, while the separated gas is discharged from the exhaust pipe 320 to the outside of the casing 100.

[0034] Optionally, the first inner cylinder 200, the inlet pipe 310, and the outlet pipe 320 are all located at the upper end of the housing 100, with the end face of the inlet pipe 310 that connects to the first inner cylinder 200 higher than the lower end face of the outlet pipe 320. By positioning the end face of the inlet pipe 310 that connects to the first inner cylinder 200 higher than the lower end face of the outlet pipe 320, it is possible to ensure 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 upper side wall of the first inner cylinder 200 is provided with an inlet 202, and one end of the inlet pipe 310 is connected to the inlet 202 to allow the inlet pipe 310 to communicate with the interior of the first inner cylinder 200.

[0035] In some embodiments of this application, a gap is provided between the shell 100 and the first inner cylinder 200, and a through hole 201 is provided on the side wall of the first inner cylinder 200, such as... Figure 6 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 through the through hole 201, and then flows downward along the inner wall of the shell 100 and the outer wall of the second inner cylinder 510 under the action of gravity, finally converging at the bottom of the shell 100.

[0036] Specifically, multiple through holes 201 are evenly distributed on the side wall of the first inner cylinder 200, and the diameter of the through holes 201 can be 5 mm. For example, as shown... Figure 6 As shown, multiple through holes 201 can be provided and divided into at least two groups along the axial direction of the first inner cylinder 200, and the through holes 201 in the same group are evenly distributed along the circumference of the first inner cylinder 200.

[0037] In some embodiments of this application, such as Figures 2-4 , Figure 6 and Figure 7 As shown, the inner diameter of the first inner cylinder 200 gradually decreases from top to bottom, and the outer diameter of the spiral plate 400 also gradually decreases from top to bottom. The outer diameter of the spiral plate 400 refers to its maximum diameter. This arrangement further reduces the cross-sectional area of ​​the spiral flow channel 401 from top to bottom, thereby more effectively increasing the medium velocity at a given flow rate, increasing centrifugal force, further optimizing the oil-gas separation effect, and improving the overall oil-gas separation efficiency.

[0038] Optionally, the first inner cylinder 200 is a tapered cylinder that is larger at the top and smaller at the bottom. For example, the first inner cylinder 200 can be a frustum structure that is larger at the top and smaller 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.

[0039] In some embodiments of this application, such as Figure 2 , Figure 4 and Figure 5 As shown, the vertical oil-gas separator also includes a second inner cylinder 510, which is disposed inside the housing 100 and below the first inner cylinder 200. The inner diameter of the second inner cylinder 510 gradually decreases from top to bottom. By providing the second inner cylinder 510 with the above-described structure below the first inner cylinder 200, the second inner cylinder 510 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 the side wall of the second inner cylinder 510 to the bottom of the housing 100.

[0040] It is understandable that 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 510, the gas would have to go through various collisions before it could finally flow 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 the second inner cylinder 510, 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.

[0041] Specifically, the second inner cylinder 510 is coaxially arranged with the outer cylinder 110, the first inner cylinder 200, and the air outlet pipe 320. The second inner cylinder 510 has openings at both the top and bottom. Optionally, the second inner cylinder 510 is a tapered cylinder that is larger at the top and smaller at the bottom. For example, the second inner cylinder 510 can be a frustum structure that is larger at the top and smaller at the bottom.

[0042] Optionally, a gap is provided between the outer wall of the second inner cylinder 510 and the inner wall of the housing 100. This arrangement facilitates the downward flow of oil on the inner wall of the housing 100 to the bottom of the housing 100 for subsequent processing.

[0043] In some embodiments of this application, such as Figure 2 , Figure 4 and Figure 5 As shown, the vertical oil-gas separator also includes a baffle 520, which is installed at the lower opening of the second inner cylinder 510. Gaps are provided between the two sides of the baffle 520 and the inner wall of the lower opening of the second inner cylinder 510. By setting the baffle 520, its top surface forms a gas reflector, which, in conjunction with the second inner cylinder 510, gathers the medium from 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 gaps between the two sides of the baffle 520 and the inner wall of the lower opening of the second inner cylinder 510 facilitate the downward flow of separated oil to the bottom of the housing 100 for subsequent processing.

[0044] 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 second inner cylinder 510 and the baffle 520 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 and making the oil sump more stable, thereby improving the sensing accuracy of the level sensor.

[0045] In some embodiments of this application, such as Figure 2As shown, an oil outlet pipe 610 is provided at the lower end of the housing 100, and the oil outlet pipe 610 passes through the housing 100. By providing the oil outlet pipe 610, the oil collected at the bottom of the housing 100 can flow out through the oil outlet pipe 610.

[0046] Optional, such as Figure 1 As shown, a sight glass 620 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.

[0047] Optional, such as Figure 1 and Figure 2 As shown, the lower end of the housing 100 is provided with a blind tube 630 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 630 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.

[0048] Optional, such as Figure 4 As shown, the lower end of the housing 100 is provided with a connector 640 for connecting an oil level switch or a temperature sensor. Specifically, an oil level switch can be connected through the connector 640 to control the working state of the vertical oil-gas separator; or, a temperature sensor can be connected through the connector 640 to detect the temperature of the oil collected at the bottom of the housing 100.

[0049] 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.

[0050] This application also provides a screw chiller, which includes a vertical oil-gas separator. The specific structure of the vertical oil-gas separator is as described in the above embodiments. Since this screw chiller adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0051] In summary, the vertical oil-gas separator provided in this application can improve oil-gas separation efficiency, optimize internal pressure loss, and improve oil level detection accuracy, thereby significantly improving the overall performance of the vertical oil-gas separator and enhancing the reliability of the screw chiller using this vertical oil-gas separator.

[0052] 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.

[0053] 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, include: Casing (100); The first inner cylinder (200) is disposed inside the shell (100); An air intake pipe (310) is inserted through the housing (100) and communicates with the upper 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 upper 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). The spiral plate (400) is spirally wound around the central axis of the air outlet pipe (320), and the pitch of the spiral plate (400) gradually decreases from top to bottom.

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

3. The vertical oil-gas separator according to claim 1, characterized in that, The vertical oil-gas separator also includes a second inner cylinder (510), which is disposed inside the housing (100) and below the first inner cylinder (200). The inner diameter of the second inner cylinder (510) gradually decreases from top to bottom.

4. The vertical oil-gas separator according to claim 3, characterized in that, A gap is provided between the outer wall of the second inner cylinder (510) and the inner wall of the shell (100).

5. The vertical oil-gas separator according to claim 3, characterized in that, The vertical oil-gas separator also includes a baffle (520), which is installed at the lower opening of the second inner cylinder (510). There is a gap between the two sides of the baffle (520) and the inner wall of the lower opening of the second inner cylinder (510).

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 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 air inlet pipe (310) is located at the upper end of the housing (100), and the end face of the air inlet pipe (310) that communicates with the first inner cylinder (200) is higher than the lower end face of the air outlet pipe (320).

8. The vertical oil-gas separator according to claim 7, characterized in that, The lower end of the housing (100) is provided with an oil outlet pipe (610), which passes through the housing (100); And / or, the lower end of the housing (100) is provided with a sight glass (620); And / or, the lower end of the housing (100) is provided with a blind tube (630) for inserting an electric heating element; And / or, the lower end of the housing (100) is provided with a connector (640) for connecting an oil level switch or a temperature sensor.

9. 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), wherein the upper end cover (120) and the lower end cover (130) are respectively detachably installed on the top opening and the bottom opening of the outer cylinder (110).

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

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