Self-reflux gas-liquid separation device and fractionation equipment

Abstract

The utility model discloses a self-backflow gas-liquid separation device which comprises a device body and a backflow piece, the device body is provided with a flow guide piece spirally extending in the height direction H of the device body, a separation cavity is formed in the device body, and the flow guide piece is located in the separation cavity. The inner wall of the separation cavity is matched with the flow guide part to form a separation flow channel, the separation flow channel is provided with a turbulent flow baffle in a protruding mode towards the inner side, in the height direction H, the backflow part is arranged in the separation cavity and located below the flow guide part, and the output portion of the backflow part extends towards the bottom of the device body and protrudes out of the device body. Meanwhile, the utility model further discloses fractionation equipment applying the self-backflow gas-liquid separation device, the separated and collected liquid can be discharged in time, the good gas-liquid separation capacity is kept all the time, and the structure is simple.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas liquid separation device field especially relates to self reflux gas liquid separation device and fractionating equipment. BACKGROUND

[0002] The gas liquid separator is a kind of equipment for separating gas and liquid mixture, is widely used in various industrial scenes, especially when separating removal steam droplet entrained in gas, while the liquid separated and collected is introduced into the bottom of separator under the action of its gravity and discharged.

[0003] At present, the gas liquid separation mode used more is cyclone type, it is a kind of more traditional spiral centrifugal separation mode, the liquid with larger specific gravity is separated out by centrifugal force, and liquid is accumulated in the bottom of separator.And the gas liquid separation capacity of this gas liquid separator is reduced by the accumulation of liquid, and the utilization rate of separation cavity is reduced. UTILITY MODEL CONTENT

[0004] In order to overcome at least one of the defects described in the prior art, the utility model provides a self reflux gas liquid separation device and fractionating equipment, which can discharge the separated and collected liquid in time and always maintain good gas liquid separation capacity, and the structure is simple.

[0005] The utility model discloses the technical scheme that is used to solve its problem is:

[0006] A self reflux gas liquid separation device, comprising:

[0007] Device body, the device body has the flow guide piece that spirally extends along the height direction H of the device body, the device body is provided with separation chamber, the flow guide piece is located in the inside of the separation chamber, and the cavity inner wall of the separation chamber cooperates with the flow guide piece to form the separation flow channel, the separation flow channel is provided with spoiler baffle that protrudes inwards;

[0008] Reflux piece, in the height direction H, the reflux piece is arranged in the inside of the separation chamber, and the reflux piece is located below the flow guide piece, and the output part of the reflux piece extends towards the bottom of the device body and protrudes the device body.

[0009] In some embodiments of the utility model, the device body also has input port and output port, the input port and the output port are communicated with the separation flow channel, in the height direction H, the input port is located at the bottom of the device body, and the output port is located at the top of the device body.

[0010] In some embodiments of this utility model, in the height direction H, the output portion of the return member extends outside the coverage area of ​​the input port, and the output portion penetrates the bottom of the device body.

[0011] In some embodiments of this utility model, the output portion of the return element extends toward and through the input port.

[0012] In some embodiments of this utility model, the reflux member includes a collection section and a guide pipe. The guide pipe is the output section of the reflux member and is connected to the collection section. The guide member can guide liquid to flow to the collection section.

[0013] In some embodiments of this utility model, the cross-sectional opening size of the collecting part gradually decreases from the side near the guide member along a first direction W, where the first direction W is opposite to the height direction H.

[0014] In some embodiments of this utility model, the bottom of the device body is a conical structure, and the cross-sectional opening size of the bottom of the device body gradually decreases from the side near the guide member along the first direction W, so that a fluid channel is formed between the bottom of the device body and the collecting part, and the fluid channel and the input port are both connected to the separation channel.

[0015] In some embodiments of this utility model, the flow guide includes a spiral conductor and a central support extending along the height direction H. The spiral conductor is wound around the central support and extends spirally along the height direction H. The spiral conductor is fixedly connected to the inner wall of the separation chamber.

[0016] In some embodiments of this utility model, the end of the central support near the return member is flush with the opening of the collecting part, or the end of the central support near the return member extends into the interior of the collecting part.

[0017] This utility model also discloses a fractionation device, including the above-mentioned self-reflux gas-liquid separation device.

[0018] In summary, the self-reflux gas-liquid separation device provided by this utility model has the following technical effects:

[0019] By configuring a return flow element below the flow guide, the flowing liquid separated during the process of gas flowing through the separation channel formed by the separation chamber and the flow guide is discharged in a timely manner, thus maintaining good gas-liquid separation capability. This solves the problem that the gas-liquid separation capability of existing gas-liquid separators decreases due to the accumulation of stored liquid, improves the utilization rate of the separation chamber, and ensures that the gas-liquid separation capability of the self-returning gas-liquid separator remains in good condition. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the cross section structure schematic view of self reflux gas-liquid separation device of the utility model;

[0021] Figure 2 It is the first structure schematic view of self reflux gas-liquid separation device of the utility model;

[0022] Figure 3 It is the second structure schematic view of self reflux gas-liquid separation device of the utility model.

[0023] Icon: 1-device body, 11-flow guide piece, 111-spiral conductor, 112-center support, 12-separation chamber, 13-input port, 14-output port, 15-sealing cover, 16-maintenance port, 17-device top wall, 18- circumferential side wall, 19-device bottom wall, 10-external port, 2-reflux piece, 21-collection part, 22-flow guide pipe, 31-separation flow channel, 32-fluid passage, 33-turbulent baffle, 41- fastening piece, 42-fastening bayonet. DETAILED DESCRIPTION

[0024] In order to better understand and implement, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model.

[0025] In the description of the utility model, it needs to be explained that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0027] Specifically according to Figure 1The utility model discloses a self reflux gas liquid separation device, including device body 1 and reflux piece 2, wherein, device body 1 has device top wall 17, peripheral side wall 18 and device bottom wall 19, peripheral side wall 18 extends along the peripheral side direction of device top wall 17, and device top wall 17 and device bottom wall 19 are respectively arranged on the two opposite sides of peripheral side wall 18, and device top wall 17, peripheral side wall 18 and device bottom wall 19 are cooperatively enclosed to form the separation chamber 12 of device body 1, and the direction from device bottom wall 19 to device top wall 17 along the central axis of device body 1 is the height direction H of device body 1. Preferably, device bottom wall 19 is integrally formed with peripheral side wall 18 to ensure the structural strength and airtightness of device body 1, and device top wall 17 is detachably connected (such as bolt connection, screw connection, clamping connection, etc.) with peripheral side wall 18 to facilitate opening the separation chamber 12 for internal maintenance and cleaning.

[0028] In the embodiment, please refer to Figure 1 Device body 1 also has flow guide piece 11 spirally extending along the height direction H of device body 1, flow guide piece 11 is located in the interior of separation chamber 12, and the inner wall of separation chamber 12 cooperates with flow guide piece 11 to form separation flow channel 31, so that the gas carrying steam droplets will flow along the extension direction of separation flow channel 31 after entering separation chamber 12, which is conducive to condensing the steam droplets in the gas into large water droplets attached to separation flow channel 31, and flowing along separation flow channel 31 and gathering into flowing liquid under the action of gravity of large water droplets. The self reflux gas liquid separation device has the following unexpected effects:

[0029] On the one hand, the spiral separation flow channel 31 can change the direction and speed of the gas during flow, forming strong turbulence, which can effectively destroy the thermal resistance boundary layer, improve the heat transfer coefficient, and thus realize more efficient heat transfer and enhance the mixing and heat exchange effect of the fluid. On the other hand, for the gas carrying steam droplets, the spiral separation flow channel 31 can use the action of centrifugal force to make the gas-liquid two-phase produce different motion trajectories, wherein the gas or lighter liquid components will tend to the central region of separation flow channel 31, and the heavier liquid will be offset to the inner wall of separation chamber 12, achieving the purpose of gas-liquid separation.

[0030] In addition, the spiral separation flow channel 31 can realize a longer flow path in the limited space of the separation chamber 12, so that the gas carrying small water droplets of steam has a greatly increased flow path in the separation chamber 12, increasing the contact area and action time between the gas and the inner wall of the cavity of the separation chamber 12 or the flow guide 11, and also improving the space utilization and heat exchange efficiency, so that the self-reflux gas-liquid separation device is more compact and portable. At the same time, the spiral separation flow channel 31 formed by the flow guide 11 and the inner wall of the cavity of the separation chamber 12 has certain advantages in mechanical properties. The spiral shape can withstand greater pressure and torque, making the entire structure more stable and reliable. Under some high pressure, high temperature or high load working conditions, the spiral separation flow channel 31 can effectively disperse stress, reduce the risk of deformation and damage of the self-reflux gas-liquid separation device, and improve the safety and reliability of the self-reflux gas-liquid separation device.

[0031] Further, please refer to Figure 1 In the height direction H of the device body 1, the reflux member 2 is arranged inside the separation chamber 12, and the reflux member 2 is located below the flow guide 11, so that the flowing liquid can drop into the reflux member 2 under the action of gravity. The output part of the reflux member 2 extends towards the bottom of the device body 1 and protrudes from the device body 1. The output part of the reflux member 2 is connected to the fractionation equipment. That is, the flowing liquid is refluxed into the fractionation equipment under the guidance of the reflux member 2.

[0032] In this way, the flowing liquid will not drop and accumulate on the bottom of the cavity inside the separation chamber 12, achieving the purpose of timely discharging the flowing liquid from the separation chamber 12. Thus, the problem of the gas-liquid separation capacity of the existing gas-liquid separator being reduced due to the accumulation of the liquid is solved, the utilization rate of the separation cavity is improved, and the gas-liquid separation capacity of the self-reflux gas-liquid separation device is maintained in a good state, so that the small water droplets of steam in the gas entering the separation chamber 12 can be continuously separated out. At the same time, the structure of the self-reflux gas-liquid separation device is simple and easy to produce, and the refluxing flowing liquid is separated from the gas carrying small water droplets of steam transported into the separation cavity, thereby avoiding the risk of interference between the flowing liquid and the gas.

[0033] Further, please refer to Figure 1 , Figure 2 and Figure 3As shown, the device body 1 also has an input port 13 and an output port 14, both of which communicate with the separation flow channel 31, the input port 13 is located at the bottom of the device body 1, that is, the input port 13 is arranged on the device bottom wall 19 of the device body 1, and the output port is located at the top of the device body 1, that is, the output port is arranged on the device top wall 17 of the device body 1. Specifically, the input port 13 and the output port 14 are provided with flange structures for bolted connection of the connecting pipe, and the gas entering the separation flow channel 31 from the input port 13 will spiral upward along the height direction H of the device body 1, so that the time of heat exchange between the gas and the outside of the device body 1 is increased, ensuring that the heat exchange between the gas and the outside of the device body 1 is more sufficient, and at the same time, the flow speed of the gas in the separation flow channel 31 is slowed down, thereby facilitating the condensation and adhesion of the steam droplets entrained in the gas in the separation flow channel 31.

[0034] It should be noted that the specific embodiments will be described in detail Figure 1 The above-mentioned reflux member 2 includes a collection part 21 and a flow guide pipe 22, the flow guide pipe 22 being an output part of the reflux member 2, wherein the flow guide pipe 22 has a first pipe connecting part, a second pipe connecting part and a pipe body, the first pipe connecting part and the second pipe connecting part are respectively arranged at two opposite ends of the pipe body, the second pipe connecting part is used to connect a fractionating device, the first pipe connecting part is fixedly connected with the collection part 21, and the first pipe connecting part of the flow guide pipe 22 is connected with the collection part 21, the cross-sectional opening size of the collection part 21 is greater than that of the flow guide pipe 22, in the height direction H of the device body 1, the collection part 21 is located at a middle part below the flow guide member 11, and the cross-sectional opening of the collection part 21 covers part of the collection part 21, so that most or all of the flow guide member 11 can guide the liquid flow into the collection part 21, and finally be guided by the flow guide pipe 22 to the fractionating device outside the device body 1.

[0035] As a preferred mode of the present embodiment, as shown in Figure 1 , Figure 2 and Figure 3 shown, in the height direction H of the device body 1, the output part of the reflux member 2 extends outside the coverage range of the input port 13, and the output part penetrates the bottom of the device body 1, that is, the pipe body of the flow guide pipe 22 extends along the second direction and penetrates the device bottom wall 19, the second direction being consistent with the radial direction of the input port 13, or the pipe body of the flow guide pipe 22 extends along the third direction and penetrates the device bottom wall 19, the third direction being inclined to the direction of the cross-sectional opening of the collection part 21. It can be understood that the pipe body of the flow guide pipe 22 is integrally formed with the device bottom wall 19 of the device body 1, so as to ensure the stability of the connection between the reflux member 2 and the device body 1. In this way, the flowing liquid entering the collection part 21 is guided to the outside of the device body 1.

[0036] As another preferred mode of the present embodiment, the output site of the reflux member 2 extends towards and penetrates the input port 13, and the pipe body of the flow guide pipe 22 is fixedly connected with the flange structure of the input port 13, so that the flowing liquid entering the collection portion 21 can be guided to the outside of the device body 1.

[0037] It can be understood that the cross-sectional opening size of the collection portion 21 gradually decreases from the side close to the flow guide member 11 along the first direction W opposite to the height direction H of the device body 1, and the collection portion 21 is preferably in a conical hopper structure, and the cross-sectional opening of the side of the collection portion 21 close to the flow guide member 11 is wider than the cross-sectional opening of the side of the collection portion 21 away from the flow guide member 11. In this way, under the action of the collection portion 21, the flowing liquid entering the collection portion 21 gradually converges to the position of the collection portion 21 for connecting the first pipe joint portion. Since the cross-sectional opening size of the flow guide pipe 22 is much smaller than the cross-sectional opening size of the collection portion 21, it is helpful to control the flow rate and flow of the flowing liquid, so as to accurately reflux and deliver the flowing liquid to the fractionation equipment.

[0038] Further, as shown in Figure 1 , the bottom of the device body 1 is in a conical structure, i.e., the device bottom wall 19 is in a conical structure, which can be a circular cone or a pyramid. The cross-sectional opening size of the bottom of the device body 1 gradually decreases from the side close to the flow guide member 11 along the first direction W, and the cross-sectional opening shape of the device bottom wall 19 is preferably adapted to the cross-sectional opening shape of the collection portion 21, so that a fluid passage 32 is formed between the bottom of the device body 1 and the collection portion 21, and the fluid passage 32 and the input port 13 are both in communication with the separation flow channel 31. In this way, the gas entering the separation flow channel 31 from the input port 13 will be directed by the fluid passage 32 into the separation flow channel 31, thereby ensuring the smoothness and stability of the gas flowing in the separation chamber 12.

[0039] Preferably, as shown in Figure 1 , the flow guide member 11 includes a spiral conductor 111 and a central support 112 extending along the height direction H of the device body 1, and the spiral conductor 111 is arranged around the central support 112 and extends spirally along the height direction H of the device body 1, and is fixedly connected with the inner wall of the separation chamber 12. The fixed connection here can be an abutting connection, a clamping connection or a welding connection. Preferably, the spiral conductor 111 is integrally formed with the central support 112 to ensure the structural strength of the flow guide member 11 as a whole. It should be noted that the flow guide member 11 in the present embodiment is separately produced with the peripheral wall 18, which can greatly reduce the manufacturing difficulty of the device body 1, thereby reducing the production cost of the device body 1.

[0040] It can be understood that, in the height direction H of the device body 1, the side of the spiral conductor 111 close to the center pillar 112 is lower than the side of the spiral conductor 111 away from the center pillar 112, so that the steam droplets in the gas condense and gather to form flowing liquid on the side of the spiral conductor 111 close to the center pillar 112, and then the flowing liquid accurately drips into the collection part 21 along the outer side wall of the center pillar 112, thereby better ensuring that all the flowing liquid flows back into the collection part 21 of the flow guide 11.

[0041] Of course, the end of the center pillar 112 of the flow guide 11 close to the reflux part 2 is flush with the opening of the collection part 21, or the end of the center pillar 112 close to the reflux part 2 extends into the interior of the collection part 21, which can also ensure that all the flowing liquid flows back into the collection part 21 of the flow guide 11.

[0042] As a preferred mode of the present embodiment, as shown in Figure 1 The above-mentioned separation flow channel 31 is provided with a turbulence baffle 33 protruding inward. Specifically, the number of turbulence baffles 33 is preferably multiple, and the multiple turbulence baffles 33 are uniformly distributed along the extension direction of the separation flow channel 31. Of course, the turbulence baffles 33 can be alternatively provided on the spiral conductor 111, or alternatively provided on the center pillar 112, that is, the turbulence baffles 33 extend from the peripheral side wall 18 of the center pillar 112 to the inner wall of the separation chamber 12, or alternatively provided on the inner wall of the separation chamber 12, that is, the turbulence baffles 33 extend from the inner wall of the separation chamber 12 to the center pillar 112, or alternatively provided in any two or any three of the above-mentioned modes, and the multiple turbulence baffles 33 are staggered.

[0043] In this way, the stable flow state of the gas carrying steam droplets in the separation flow channel 31 can be destroyed, the relative speed between the gas and the liquid is increased, and the effect of the centrifugal force is enhanced. The steam droplets in the gas are more easily thrown to the inner wall of the separation chamber 12 under the action of the centrifugal force, thereby achieving more efficient separation of the gas and the liquid, especially for the separation of small droplets. The content of the droplets carried in the gas can be effectively reduced, and the separation efficiency can be improved. At the same time, the turbulence baffles 33 can also form local vortex and backflow zones in the separation flow channel 31, so that smaller steam droplets have more opportunities to collide and coalesce with each other to form larger droplets / beads. The large droplets / beads are more easily separated from the gas under the combined action of gravity and centrifugal force, thereby further improving the degree of gas-liquid separation and improving the purity of the separated gas and liquid.

[0044] In addition, the spoiler baffle 33 can play a role of blocking and intercepting, preventing the liquid from being entrained by the airflow again, and ensuring that the separated steam droplets or large droplets can smoothly flow out along the extension direction of the separation flow channel 31, thereby improving the stability and reliability of the gas-liquid separation. It also effectively changes the flow field structure in the separation flow channel 31 arranged in a spiral, making the distribution of the airflow and the steam droplets more uniform. In this way, it can avoid the situation of local high or low flow rate, reduce the vortex and dead zone caused by uneven flow field, improve the working efficiency and performance of the entire gas-liquid separation device, and make the gas-liquid separation process more stable and efficient.

[0045] In some embodiments, specifically according to Figure 2 As shown in Figs. 1-3, the device body 1 also has a sealing cover 15, and the device body 1 is provided with an inspection opening 16 communicating with the separation flow channel 31, so that the inspector can view the inside of the separation flow channel 31 and the separation chamber 12 through the inspection opening 16, improving the convenience of inspection. Further, the sealing cover 15 is arranged on the inspection opening 16. Specifically, the inspection opening 16 is provided with an end cover flange protruding outwardly of the device body 1, and the end cover flange is detachably connected with the sealing cover 15 to ensure the sealing of the separation chamber 12. It can be understood that the detachable connection is preferably configured with a fastening piece 41 on the outer side wall of the end cover flange, and the peripheral edge of the sealing cover 15 is provided with a fastening bayonet 42, so that the fastening piece 41 is clamped in the fastening bayonet 42, so that the sealing cover 15 is firmly covered on the inspection opening 16. Specifically, the fastening piece 41 includes a fastening body, a fastening hinge end and a fastening clamping end arranged at both ends of the fastening body, and the fastening hinge end of the fastening body is hingedly connected with the fastening body. Turn the fastening body to make the fastening body inserted into the inside of the fastening bayonet 42, and the fastening clamping end abuts against the top side of the sealing cover 15. The structure is simple and easy to assemble. Of course, in addition to the cooperation of the fastening piece 41 and the fastening bayonet 42 to achieve clamping, other clamping structures can also be used. The detachable connection can also be selected as a bolt connection, and can also be connected by using a hinge component.

[0046] In some embodiments, specifically according to Figure 2 and Figure 3 As shown in Figs. 1-3, the device body 1 also has a sealing cover 15, and the device body 1 is provided with an inspection opening 16 communicating with the separation flow channel 31, so that the inspector can view the inside of the separation flow channel 31 and the separation chamber 12 through the inspection opening 16, improving the convenience of inspection. Further, the sealing cover 15 is arranged on the inspection opening 16. Specifically, the inspection opening 16 is provided with an end cover flange protruding outwardly of the device body 1, and the end cover flange is detachably connected with the sealing cover 15 to ensure the sealing of the separation chamber 12. It can be understood that the detachable connection is preferably configured with a fastening piece 41 on the outer side wall of the end cover flange, and the peripheral edge of the sealing cover 15 is provided with a fastening bayonet 42, so that the fastening piece 41 is clamped in the fastening bayonet 42, so that the sealing cover 15 is firmly covered on the inspection opening 16. Specifically, the fastening piece 41 includes a fastening body, a fastening hinge end and a fastening clamping end arranged at both ends of the fastening body, and the fastening hinge end of the fastening body is hingedly connected with the fastening body. Turn the fastening body to make the fastening body inserted into the inside of the fastening bayonet 42, and the fastening clamping end abuts against the top side of the sealing cover 15. The structure is simple and easy to assemble. Of course, in addition to the cooperation of the fastening piece 41 and the fastening bayonet 42 to achieve clamping, other clamping structures can also be used. The detachable connection can also be selected as a bolt connection, and can also be connected by using a hinge component.

[0047] Based on the structure and connection relationship of the self-reflux gas-liquid separation device, the inventor also discloses a fractionating equipment comprising the self-reflux gas-liquid separation device.

[0048] The technical means disclosed by the utility model scheme is not limited to the technical means disclosed by the above-mentioned embodiments, and also includes technical solutions composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the technical field, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A self-refluxing gas-liquid separation device, characterized by, The device comprises: a device body (1) having a flow guide (11) spirally extending along a height direction H of the device body (1), the device body (1) being provided with a separation chamber (12), the flow guide (11) being located inside the separation chamber (12), and the inner wall of the separation chamber (12) cooperating with the flow guide (11) to form a separation flow channel (31), the separation flow channel (31) being provided with a spoiler (33) protruding inwardly on the inner side; a reflux member (2) located inside the separation chamber (12) in the height direction H, and the reflux member (2) being located below the flow guide (11), the output part of the reflux member (2) extending towards the bottom of the device body (1) and protruding out of the device body (1).

2. The self-refluxing gas-liquid separation device of claim 1, wherein: The device body (1) further has an input port (13) and an output port (14), both of which communicate with the separation flow channel (31), the input port (13) being located at the bottom of the device body (1) in the height direction H, and the output port (14) being located at the top of the device body (1).

3. The self-refluxing gas-liquid separation device of claim 2, wherein: In the height direction H, the output part of the reflux member (2) extends out of the coverage range of the input port (13), and the output part penetrates through the bottom of the device body (1).

4. The self-refluxing gas-liquid separation device of claim 2, wherein: The output part of the reflux member (2) extends towards the input port (13) and penetrates through the input port (13).

5. The self-refluxing gas-liquid separation device according to claim 2 or 3 or 4, characterized in that: The reflux member (2) comprises a collection part (21) and a flow guide pipe (22), the flow guide pipe (22) being the output part of the reflux member (2), the flow guide pipe (22) communicating with the collection part (21), and the flow guide (11) being capable of guiding liquid flow to the collection part (21).

6. The self-refluxing gas-liquid separation device of claim 5, wherein: The cross-sectional opening size of the collection part (21) gradually decreases along a first direction W from the side close to the flow guide (11), and the first direction W is opposite to the height direction H.

7. The self-refluxing gas-liquid separation device of claim 6, wherein: The bottom of the device body (1) is in a conical shape structure, and the cross-sectional opening size of the bottom of the device body (1) gradually decreases along the first direction W from the side close to the flow guide (11), so that a fluid passage (32) is formed between the bottom of the device body (1) and the collection part (21), and the fluid passage (32) and the input port (13) both communicate with the separation flow channel (31).

8. The self-refluxing gas-liquid separation device of claim 5, wherein: The flow guide (11) comprises a spiral conductor (111) and a center support (112) extending along the height direction H, the spiral conductor (111) being arranged around the center support (112) and spirally extending along the height direction H, and the spiral conductor (111) being fixedly connected to the inner wall of the separation chamber (12).

9. The self-refluxing gas-liquid separation device of claim 8, wherein: The end of the center support (112) close to the reflux member (2) is flush with the opening of the collection part (21), or the end of the center support (112) close to the reflux member (2) extends into the inside of the collection part (21).

10. Fractionation apparatus characterised in that: The self-refluxing gas-liquid separation device according to any one of claims 1 to 9.

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