A multi-stage gas-liquid separator

Abstract

The present invention discloses a multi-stage gas-liquid separator, which includes a cylinder body. The cylinder body includes an upper shell and a lower shell. The upper shell is provided with an inner cavity exhaust port and an outer cavity exhaust port, and the upper shell is provided with a liquid inlet. The bottom of the lower shell is provided with a liquid discharge port. The upper shell and the lower shell are hermetically connected through a connecting piece; a demisting net is further arranged inside the cylinder body. A secondary separation tube is also arranged inside the cylinder body along the vertical direction, and a separation cavity is formed between the secondary separation tube and the inner wall of the cylinder body. The separation cavity is communicated with the outer cavity exhaust port; a gas accumulation component is arranged in the gas accumulation space, which can be quickly disassembled and replaced when the demisting net is blocked. By arranging the secondary separation tube, a part of the gas is exhausted for the first time through the outer cavity exhaust port, and another part of the gas flows into the secondary separation tube and is exhausted for the second time through the inner cavity exhaust port. This solution does not require multiple demisting nets for multi-stage separation, reducing the possibility of demisting net blockage, and the secondary exhaust improves the separation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-liquid separators, and specifically to a multi-stage gas-liquid separator. Background Art

[0002] During the process of pipeline liquid transportation, gas may be mixed in, or gas may be generated due to the decomposition of chemical substances in the liquid to form a gas-liquid mixture. These gases will affect the subsequent normal production process, so a degassing device needs to be set in the pipeline.

[0003] A gas-liquid separator is a commonly used separation device for separating gas and liquid. Its separation principle includes the gravity sedimentation principle. Since the specific gravities of gas and liquid are different, when the liquid and gas flow together, they tend to separate in the gravity field. The liquid flows downward under the action of gravity and flows out through the bottom liquid discharge port, while the gas forms bubbles and floats upward to be discharged through the exhaust port to achieve separation. The foam arrestor structure is commonly used in gas-liquid separators. Through baffle separation, the separation effect is further enhanced. The principle is that when the gas-liquid mixture flows together, if it encounters an obstruction, the foam arrestor intercepts the gas and causes it to flow in a baffle, and the liquid converges and discharges after passing through the foam arrestor due to inertia.

[0004] The existing gas-liquid separators have the following defects:

[0005] 1. When there are impurities in the gas-liquid mixture, the foam arrestor may become blocked, affecting the separation effect. When blockage occurs, it is difficult to clean the foam arrestor, thereby reducing the overall separation efficiency.

[0006] 2. After single separation by the existing gas-liquid separators, there are still many dispersed bubbles in the liquid phase. It is difficult for the bubbles to converge, and multiple separations need to be carried out through multiple foam arrestors, resulting in low separation efficiency. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-stage gas-liquid separator with good separation effect, and all internal parts of the gas-liquid separator can be conveniently disassembled and cleaned to effectively prevent blockage.

[0008] To achieve the above object, the present invention provides the following technical solution: A multi-stage gas-liquid separator, comprising a cylinder body, the cylinder body includes an upper housing and a lower housing, the upper housing is provided with an inner cavity exhaust port and an outer cavity exhaust port, and the upper housing is provided with a liquid inlet, the bottom of the lower housing is provided with a liquid discharge port, and the upper housing and the lower housing are hermetically connected through a connecting member; a fixed position is provided on one side of the cylinder body near the inner cavity exhaust port, and a demisting net is further arranged inside the cylinder body, the demisting net matches the inner diameter of the cylinder body, and the demisting net is detachably connected to the fixed position; a secondary separation tube is further arranged inside the cylinder body along the vertical direction, the secondary separation tube penetrates through the demisting net, and a separation cavity is formed between the secondary separation tube and the inner wall of the cylinder body, and the separation cavity is communicated with the outer cavity exhaust port; the secondary separation tube includes a connection end and an air inlet end, the connection end is communicated with the inner cavity exhaust port, the air inlet end forms a gas gathering space with the bottom of the cylinder body, and a gas gathering component is arranged in the gas gathering space, and the gas gathering component is used to drive the bubbles to converge and flow into the secondary separation tube from the air inlet end.

[0009] By adopting the above technical solution, the demisting net is installed on the upper side section of the lower housing through the fixed position, the connection end of the secondary separation tube is communicated with the inner cavity exhaust port of the upper housing, the air inlet end passes through the demisting net and extends to the gas gathering space, and after the upper housing and the lower housing are butted, they are hermetically connected through a connecting member, and the demisting net can be quickly installed and replaced; during operation, the gas-liquid mixture is injected into the separation cavity from the liquid inlet of the upper housing, due to the action of gravity, the liquid moves downward and passes through the demisting net, a part of the gas is separated by baffle flow through the demisting net and generates an upward floating movement, and the first exhaust is carried out through the outer cavity exhaust port in the separation cavity above the demisting net; another part of the gas passes through the demisting net, and together with the liquid, it moves downward to the gas gathering space along with the liquid inlet driving force, the liquid is discharged through the bottom of the lower housing, the gas gathering component drives the bubbles to converge and flow into the secondary separation tube from the air inlet end, and generates an upward buoyancy force to move upward, and the second exhaust is carried out through the inner cavity exhaust port. This solution does not require multiple demisting nets for multi-stage separation, reduces the possibility of demisting net blockage, and improves the separation efficiency through the second exhaust.

[0010] Preferably, a first spiral sheet is arranged around the secondary separation tube in the separation cavity, the first spiral sheet is used to provide centrifugal power, a centrifugal cavity is formed between the first spiral sheet and the cylinder body, and the centrifugal cavity is arranged on the lower side of the demisting net.

[0011] By adopting the above technical solution, the gas-liquid mixture generates centrifugal force by means of the spiral, so that the gas and the liquid are separated due to different specific gravities. Under the action of gravity and centrifugal force, the liquid with a larger specific gravity in the centrifugal cavity migrates to the inner walls on both sides of the lower housing to form a liquid film, and the gas with a smaller specific gravity moves towards the center of the secondary separation tube to converge into a gas core and continues to move downward.

[0012] Preferably, the gas-gathering component includes an upper conical plate, a lower conical plate, and a driving part. The lower conical plate is attached to the bottom of the upper conical plate, and the air inlet end extends to the bottom of the lower conical plate. The upper conical plate is fixedly connected to the inner wall of the cylinder, and the lower conical plate is rotatably connected to the inner wall of the cylinder. The driving part is used to drive the lower conical plate to rotate. The upper conical plate is provided with a first flow port, and the lower conical plate is provided with a blocking part and a second flow port. When the driving part drives the lower conical plate to rotate to the first position, the second flow port communicates with the first flow port. When the driving part drives the lower conical plate to move to the second position, the blocking part cuts off the first flow port.

[0013] By adopting the above technical solution, the gas and liquid in the centrifugal chamber are separated and continue to move downward. The driving part drives the lower conical plate to rotate to the first position. At this time, the second flow port and the first flow port communicate, and the gas-liquid mixture continues to move along the first flow port to the gas-gathering space. The driving part drives the lower conical plate to move to the second position, so that the blocking part cuts off the first flow port. The gas-gathering component drives the bubbles to continue to converge. At this time, the bubbles float upward under the action of gravity. Since the blocking part blocks the first flow port, the converged and floating bubbles enter the secondary separation tube from the air inlet end. The heights of the upper conical plate and the lower conical plate gradually decrease from the center to both sides, further giving the bubbles a tendency to float upward and converge to the center, which is beneficial to the scattered bubbles converging into gas nuclei and entering the secondary separation tube from the air inlet end.

[0014] Preferably, the driving part includes a micro motor and a bottom support position. The bottom support position is fixedly connected to the lower conical plate and is rotatably connected to the inner wall of the cylinder. The micro motor is fixed on the outer wall of the cylinder near the liquid discharge port. A first rotating shaft is fixed to the output end of the micro motor, a second rotating shaft is fixed to the bottom support position, and the first rotating shaft and the second rotating shaft are rotationally connected through bevel gears.

[0015] By adopting the above technical solution, the micro motor drives the first rotating shaft to rotate, thereby driving the second rotating shaft to rotate, causing the bottom support position fixed to the second rotating shaft to rotate, and driving the lower conical plate to alternately move between the first position and the second position.

[0016] Preferably, a second spiral blade is arranged on the second rotating shaft. The second spiral blade is located in the gas-gathering space and is used for secondary centrifugation of the gas-liquid mixture.

[0017] By adopting the above technical solution, the gas-liquid mixture rebounds and continues to move upward after moving to the bottom of the lower housing through the first flow port. During this process, some larger bubbles are scattered and float upward. When the second rotating shaft rotates, the second spiral blade generates a secondary centrifugal force and driving force. The liquid with a larger specific gravity moves to both sides and moves upward, and the gas with a smaller specific gravity continues to converge into a gas nucleus toward the center of the second rotating shaft. The gas nucleus continues to move upward and enters the secondary separation tube from the air inlet end.

[0018] Preferably, a fixing groove is provided inside the upper housing along the vertical direction. The liquid inlet and the inner cavity exhaust port are both communicated with the fixing groove, and the connecting end is matched with the inner wall of the fixing groove; an external thread is provided outside the upper housing, and a clamping block is provided on the outer side of one end of the lower housing close to the upper housing. The connecting member is an external nut, and the external nut is sleeved at the junction of the upper housing and the lower housing and is threadedly connected to the upper housing, and is clamped and fixed by the clamping block.

[0019] By adopting the above technical solution, the connecting end of the secondary separation tube is installed on the upper housing through the fixing groove, and the installed upper housing and the lower housing are butted, and the external nut is tightened until the external nut abuts against the clamping block, so as to realize the sealed connection of the upper housing and the lower housing.

[0020] Preferably, a plurality of engaging portions are provided around the outside of the mist eliminator net. A groove matching the plurality of engaging portions is provided at one end of the lower housing close to the upper housing, and the engaging portions are used to support the groove; the groove is L-shaped, and the groove includes an extension groove opened in the radial direction of the inner wall of the lower housing, and the extension groove is used to clamp and fix the engaging portions.

[0021] By adopting the above technical solution, the mist eliminator net is placed in the matching groove through the plurality of engaging portions, and the mist eliminator net is rotated so that the plurality of extension grooves clamp and fix the engaging portions.

[0022] Preferably, the bottom support position includes a plurality of fixing ribs and a fixing ring, and the fixing ring is matched with the inner diameter of the lower housing; the plurality of fixing ribs are arranged around the fixing ring, and the center of the fixing ring is fixedly connected to the second rotating shaft; the lower conical plate is provided with insertion holes matching the plurality of fixing ribs, and the lower conical plate is clamped to the plurality of fixing ribs through the insertion holes.

[0023] By adopting the above technical solution, the lower conical plate is clamped to the plurality of fixing ribs through the insertion holes, so that the lower conical plate is connected to the fixing ring through the fixing ribs, and the fixing ring is placed at the bottom of the lower housing.

[0024] Preferably, the inner diameter ratio of the secondary separation tube to the lower housing is 1 / 2 - 1 / 3.

[0025] By adopting the above technical solution, the best flow area of the gas-liquid mixture is provided.

[0026] Beneficial effects:

[0027] In the present invention, the connecting end of the secondary separation tube is installed on the upper housing through a fixing groove; the mist eliminator is placed in a groove matching the lower housing through a plurality of engaging parts, and the mist eliminator is rotated to tightly fix the engaging parts of the mist eliminator through a plurality of extending grooves, and the upper housing and the lower housing are hermetically connected through an external nut; when there are impurities in the gas-liquid mixture, causing the mist eliminator to become blocked and affecting the separation effect, the rapid separation and replacement of the mist eliminator can be realized.

[0028] In the present invention, by providing a secondary separation tube, the gas-liquid mixture is injected into the separation chamber from the liquid inlet of the upper housing. A part of the gas is subjected to baffle separation through the mist eliminator and generates a floating motion, and the first exhaust is carried out through the outer chamber exhaust port in the upper part of the separation chamber of the mist eliminator; another part of the gas passes through the mist eliminator and moves downward with the liquid along with the liquid inlet driving force to the gas gathering space. The liquid is drained through the bottom of the lower housing, and the gas floats upward and is subjected to secondary exhaust through the inner chamber exhaust port, thereby improving the gas-liquid separation efficiency through the secondary exhaust.

[0029] In the present invention, by providing a gas gathering assembly in the gas gathering space, the gas-liquid mixture moves downward with the liquid along with the liquid inlet driving force to the gas gathering space, and the gas gathering assembly drives the bubbles to converge and flow into the secondary separation tube from the air inlet end, overcoming the problem that there are many scattered bubbles in the traditional liquid phase and the bubbles are difficult to converge, and improving the separation efficiency. Description of the Drawings

[0030] Figure 1 is a cross-sectional view of a multi-stage gas-liquid separator of the present invention;

[0031] Figure 2 is a schematic external structure diagram of a multi-stage gas-liquid separator of the present invention;

[0032] Figure 3 is a diagram showing the positional relationship between the mist eliminator and the groove of a multi-stage gas-liquid separator of the present invention;

[0033] Figure 4 is a schematic structural diagram of the upper conical plate of a multi-stage gas-liquid separator of the present invention;

[0034] Figure 5 is a schematic structural diagram of the lower conical plate of a multi-stage gas-liquid separator of the present invention;

[0035] Figure 6 is a multi-stage gas-liquid separator of the present invention Figure 1 at the structure diagram at A;

[0036] Figure 7 is a diagram showing the positional relationship between the fixing ring and the fixing rib of a multi-stage gas-liquid separator of the present invention.

[0037] In the figure: 1. Upper housing; 11. Inner cavity exhaust port; 12. Outer cavity exhaust port; 13. Liquid inlet; 2. Lower housing; 21. Liquid discharge port; 22. Groove; 23. Extension groove; 3. Connecting nut; 4. Mist eliminator mesh; 41. Engaging portion; 5. Secondary separation tube; 51. First spiral fin; 52. Connecting end; 53. Air inlet end; 6. Gas gathering assembly; 61. Upper conical plate; 611. First flow port; 62. Lower conical plate; 621. Blocking portion; 622. Second flow port; 623. Insertion hole; 7. Driving portion; 71. Micro motor; 72. First rotating shaft; 73. Second rotating shaft; 74. Second spiral fin; 8. Bottom support position; 81. Fixed rib; 82. Fixed ring. Detailed implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Next, a detailed description of an embodiment of the present invention will be given:

[0040] As Figure 1 and Figure 2 shown, a multi-stage gas-liquid separator includes a cylinder body, the cylinder body includes an upper housing 1 and a lower housing 2, the upper housing 1 is provided with an inner cavity exhaust port 11 and an outer cavity exhaust port 12, and the upper housing 1 is provided with a liquid inlet 13. The bottom of the lower housing 2 is provided with a liquid discharge port 21. The upper housing 1 and the lower housing 2 are hermetically connected through a connecting member; a fixed position is provided on one side of the cylinder body interior close to the inner cavity exhaust port 11. A mist eliminator mesh 4 is also provided inside the cylinder body. The mist eliminator mesh 4 matches the inner diameter of the cylinder body, and the mist eliminator mesh 4 is detachably connected to the fixed position; a secondary separation tube 5 is also provided inside the cylinder body along the vertical direction. The secondary separation tube 5 penetrates through the mist eliminator mesh 4, and a separation cavity is formed between the secondary separation tube 5 and the inner wall of the cylinder body. The separation cavity is communicated with the outer cavity exhaust port 12; the secondary separation tube 5 includes a connecting end 52 and an air inlet end 53. The connecting end 52 is communicated with the inner cavity exhaust port 11, and an air gathering space is formed between the air inlet end 53 and the bottom of the cylinder body. A gas gathering assembly 6 is provided in the air gathering space. The gas gathering assembly 6 is used to drive the bubbles to converge and flow into the secondary separation tube 5 from the air inlet end 53. Preferably, the ratio of the inner diameters of the secondary separation tube 5 and the lower housing 2 is 1 / 2 - 1 / 3; providing the best flow area for the gas-liquid mixture.

[0041] Specifically, as Figure 3As shown, a number of engaging portions 41 are circumferentially provided on the outer side of the mist eliminator net 4, and a groove 22 matching the number of engaging portions 41 is provided at one end of the lower housing 2 close to the upper housing 1. The engaging portions 41 are used to support the groove 22. The groove 22 is provided in an L shape and includes an extension groove 23 opened in the radial direction of the inner wall of the lower housing 2. The extension groove 23 is used to tightly fix the engaging portions 41. The mist eliminator net 4 is placed in the matching groove 22 through a number of engaging portions 41, and the mist eliminator net 4 is rotated so that a number of extension grooves 23 tightly fix the engaging portions 41.

[0042] Specifically, as Figure 7 shown, the bottom support 8 includes a number of fixing ribs 81 and a fixing ring 82. The fixing ring 82 matches the inner diameter of the lower housing 2. A number of fixing ribs 81 are arranged around the fixing ring 82, and the center of the fixing ring 82 is fixedly connected to the second rotating shaft 73. The lower conical plate is provided with insertion holes matching the number of fixing ribs 81, and the lower conical plate is clamped to the number of fixing ribs 81 through the insertion holes. The lower conical plate is clamped to the number of fixing ribs 81 through the insertion holes 623, so that the lower conical plate 62 is connected to the fixing ring 82 through the fixing ribs 81, and the fixing ring 82 is placed at the bottom of the lower housing 2.

[0043] The mist eliminator net 4 is installed on the cross-section of the lower housing 2 through the fixing position. The connection end 52 of the secondary separation pipe 5 is communicated with the inner cavity exhaust port 11 of the upper housing 1. The air inlet end 53 passes through the mist eliminator net 4 and extends to the gas gathering space. After the upper housing 1 and the lower housing 2 are butted, they are hermetically connected through a connecting member. The mist eliminator net 4 can be quickly installed and replaced. As a preferred embodiment, a fixing groove is provided inside the upper housing 1 in the vertical direction. The liquid inlet 13 and the inner cavity exhaust port 11 are both communicated with the fixing groove. The connection end 52 matches the inner wall of the fixing groove. An external thread is provided on the outside of the upper housing 1, and a clamping block is provided on the outer side of one end of the lower housing 2 close to the upper housing 1. The connecting member is an external nut. The external nut is sleeved at the junction of the upper housing 1 and the lower housing 2 and is threadedly connected to the upper housing 1 and is tightly fixed through the clamping block. The connection end 52 of the secondary separation pipe 5 is installed on the upper housing 1 through the fixing groove, and the installed upper housing 1 and the lower housing 2 are butted, and the external nut is tightened until the external nut abuts against the clamping block to realize the sealed connection of the upper housing 1 and the lower housing 2.

[0044] During operation, the gas-liquid mixture is injected into the separation chamber from the liquid inlet 13 of the upper housing 1. Due to the action of gravity, the liquid moves downward and passes through the mist eliminator 4. A part of the gas passes through the mist eliminator 4 for baffle separation and generates an upward floating motion. The upper part of the separation chamber above the mist eliminator 4 performs the first exhaust through the outer chamber exhaust port 12. Another part of the gas passes through the mist eliminator 4 and moves downward with the liquid along with the liquid inlet driving force to the gas accumulation space. The liquid is drained through the bottom of the lower housing 2. The gas accumulation assembly 6 drives the gas bubbles to converge and flow into the secondary separation tube 5 from the gas inlet end 53, and generates an upward buoyancy force to move upward, and performs the second exhaust through the inner chamber exhaust port 11. The outer chamber exhaust port 12 and the inner chamber exhaust port 11 are both provided with a determination assembly, and this determination assembly is preferably a liquid level sensor and a gas valve. When the liquid level sensor obtains that the liquid height is lower than the safety height value, the gas valve opens. When the liquid level sensor obtains that the liquid height is higher than the safety height value, the gas valve closes, which can prevent the liquid from being discharged from the outer chamber exhaust port 12 or the inner chamber exhaust port 11 together with the gas. This determination assembly is a prior art and will not be elaborated here.

[0045] This solution does not require multiple mist eliminators 4 for multi-stage separation, reducing the possibility of blockage of the mist eliminator 4, and the second exhaust improves the separation efficiency.

[0046] Specifically, as Figure 4 、 Figure 5 and Figure 6 shown, a first spiral fin 51 is arranged around the secondary separation tube 5 in the separation chamber. The first spiral fin 51 is used to provide centrifugal force. A centrifugal chamber is formed between the first spiral fin 51 and the cylinder body, and the centrifugal chamber is arranged on the lower side of the mist eliminator 4. The gas accumulation assembly 6 includes an upper conical plate, a lower conical plate and a driving part 7. The bottom of the lower conical plate is attached to the bottom of the upper conical plate, and the gas inlet end 53 extends to the bottom of the lower conical plate. The upper conical plate is fixedly connected to the inner wall of the cylinder body, and the lower conical plate is rotatably connected to the inner wall of the cylinder body. The driving part 7 is used to drive the lower conical plate to rotate. The upper conical plate is provided with a first flow port 611. The lower conical plate is provided with a blocking part 621 and a second flow port 622. When the driving part 7 drives the lower conical plate to rotate to the first position, the second flow port 622 communicates with the first flow port 611. When the driving part 7 drives the lower conical plate to move to the second position, the blocking part 621 cuts off the first flow port 611.

[0047] When the gas-liquid mixture passes through the mist eliminator 4, the spiral generates centrifugal force, causing the gas and liquid to separate due to different specific gravities. Under the action of gravity and centrifugal force, the liquid with a larger specific gravity in the centrifugal chamber migrates downward along the inner walls on both sides of the lower housing 2 to form a liquid film, while the gas with a smaller specific gravity moves towards the center of the secondary separation tube 5, converges into a gas core, and continues to move downward. The driving part 7 drives the lower conical plate to rotate to the first position. At this time, the second flow port 622 is communicated with the first flow port 611, and the gas-liquid mixture continues to move along the first flow port 611 to the gas accumulation space. The driving part 7 drives the lower conical plate to move to the second position, so that the blocking part 621 cuts off the first flow port 611. The gas accumulation component 6 drives the bubbles to continue to converge. At this time, the bubbles float upward under the action of gravity. Since the blocking part 621 blocks the first flow port 611, the converged and floating bubbles enter the secondary separation tube 5 from the air inlet end 53. The heights of the upper conical plate and the lower conical plate gradually decrease from the center to both sides, further giving the bubbles a tendency to float upward and converge towards the center, which is beneficial for the scattered bubbles to converge into a gas core and enter the secondary separation tube 5 from the air inlet end 53.

[0048] Specifically, the driving part 7 includes a micro motor 71 and a bottom support position 8. The bottom support position 8 is fixedly connected to the lower conical plate and rotatably connected to the inner wall of the cylinder body. The micro motor 71 is fixed on the outer wall of the cylinder body near the liquid discharge port 21. A first rotating shaft 72 is fixed to the output end of the micro motor 71. A second rotating shaft 73 is fixed to the bottom support position 8, and the first rotating shaft 72 and the second rotating shaft 73 are rotationally connected by bevel gears. A second spiral blade 74 is arranged on the second rotating shaft 73. The second spiral blade 74 is located in the gas accumulation space, and the second spiral blade 74 is used for secondary centrifugation of the gas-liquid mixture. The micro motor 71 drives the first rotating shaft 72 to rotate, thereby driving the second rotating shaft 73 to rotate, causing the bottom support position 8 fixed to the second rotating shaft 73 to rotate, and driving the lower conical plate to alternately move between the first position and the second position. The gas-liquid mixture moves to the bottom of the lower housing 2 through the first flow port 611 and then rebounds and moves upward. During this process, some larger bubbles are scattered and float upward. When the second rotating shaft 73 rotates, the second spiral blade 74 generates secondary centrifugal force and driving force. The liquid with a larger specific gravity moves towards both sides and upward, while the gas with a smaller specific gravity continues to converge towards the center of the second rotating shaft 73 to form a gas core, and the gas core continues to move upward and enters the secondary separation tube 5 from the air inlet end 53.

[0049] Working principle:

[0050] During installation, the connecting end 52 of the secondary separation tube 5 is installed on the upper housing 1 through the fixing groove; the mist eliminator 4 is placed in the matching groove 22 of the lower housing 2 through a plurality of engaging portions 41, and the mist eliminator 4 is rotated to make a plurality of extension grooves 23 clamp and fix the engaging portions 41 of the mist eliminator 4. The upper housing 1 and the lower housing 2 are butted, and the external nut is tightened until the external nut abuts against the clamping block, so as to realize the sealed connection of the upper housing 1 and the lower housing 2.

[0051] During operation, the gas-liquid mixture is injected into the separation chamber from the liquid inlet 13 of the upper housing 1. Due to the action of gravity, the liquid moves downward and passes through the mist eliminator 4. A part of the gas is separated by baffle flow through the mist eliminator 4 and generates an upward floating movement. The upper part of the separation chamber on the mist eliminator 4 performs the first exhaust through the outer chamber exhaust port 12; another part of the gas passes through the mist eliminator 4. The gas-liquid mixture generates centrifugal force by means of a spiral, so that the gas and the liquid are separated due to different specific gravities. Under the action of gravity and centrifugal force, the liquid with a larger specific gravity in the centrifugal chamber migrates to the inner walls on both sides of the lower housing 2 to form a liquid film, and the gas with a smaller specific gravity moves towards the center of the secondary separation tube 5 to converge into a gas core and continues to move downward. The gas and the liquid in the centrifugal chamber are separated and continue to move downward. The driving part 7 drives the lower conical plate to rotate to the first position. At this time, the second flow port 622 and the first flow port 611 are communicated, and the gas-liquid mixture continues to move along the first flow port 611 to the gas gathering space; the driving part 7 drives the lower conical plate to move to the second position, so that the blocking part 621 cuts off the first flow port 611, and the gas gathering assembly 6 drives the bubbles to continue to converge. At this time, the bubbles float upward under the action of gravity. Since the blocking part 621 blocks the first flow port 611, the converged and floating bubbles enter the secondary separation tube 5 from the air inlet end 53. The heights of the upper conical plate and the lower conical plate gradually decrease from the center to both sides, further giving the bubbles a tendency to float upward and converge towards the center, which is beneficial to the scattered bubbles converging into a gas core and entering the secondary separation tube 5 from the air inlet end 53. The gas gathering assembly 6 drives the bubbles to converge and flow into the secondary separation tube 5 from the air inlet end 53, and generates an upward buoyancy force to move upward, and performs the second exhaust through the inner chamber exhaust port 11.

[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A multi-stage gas-liquid separator, comprising a cylinder body, characterized in that: The cylinder body includes an upper shell (1) and a lower shell (2). The upper shell (1) is provided with an inner cavity exhaust port (11) and an outer cavity exhaust port (12), and the upper shell (1) is provided with a liquid inlet (13). The bottom of the lower shell (2) is provided with a liquid discharge port (21). The upper shell (1) and the lower shell (2) are hermetically connected through a connecting piece. A fixed position is provided on one side of the cylinder body near the inner cavity exhaust port (11). A demisting net (4) is also arranged inside the cylinder body. The demisting net (4) matches the inner diameter of the cylinder body, and the demisting net (4) is detachably connected to the fixed position. A secondary separation tube (5) is further arranged inside the cylinder body along the vertical direction. The secondary separation tube (5) penetrates through the demisting net (4), and a separation cavity is formed between the secondary separation tube (5) and the inner wall of the cylinder body. The separation cavity is communicated with the outer cavity exhaust port (12). The secondary separation tube (5) includes a connecting end (52) and an air inlet end (53). The connecting end (52) is communicated with the inner cavity exhaust port (11). The air inlet end (53) forms a gas gathering space with the bottom of the cylinder body. A gas gathering component (6) is arranged in the gas gathering space. The gas gathering component (6) is used to drive bubbles to flow into the secondary separation tube (5) from the air inlet end (53). A first spiral fin (51) is arranged around the secondary separation tube (5) in the separation cavity. The first spiral fin (51) is used to provide centrifugal force. A centrifugal cavity is formed between the first spiral fin (51) and the cylinder body. The centrifugal cavity is arranged on the lower side of the demisting net (4). The gas gathering component (6) includes an upper conical plate, a lower conical plate and a driving part (7). The lower conical plate fits with the bottom of the upper conical plate. The air inlet end (53) extends to the bottom of the lower conical plate. The upper conical plate is fixedly connected to the inner wall of the cylinder body. The lower conical plate is rotatably connected to the inner wall of the cylinder body. The driving part (7) is used to drive the lower conical plate to rotate. The upper conical plate is provided with a first flow port (611). The lower conical plate is provided with a blocking part (621) and a second flow port (622). When the driving part (7) drives the lower conical plate to rotate to the first position, the second flow port (622) is communicated with the first flow port (611). When the driving part (7) drives the lower conical plate to move to the second position, the blocking part (621) cuts off the first flow port (611). The driving part (7) includes a micro motor (71) and a bottom support position (8). The bottom support position (8) is fixedly connected to the lower conical plate and is rotatably connected to the inner wall of the cylinder body. The micro motor (71) is fixed on the outer wall of the cylinder body near the liquid discharge port (21). A first rotating shaft (72) is fixed to the output end of the micro motor (71). A second rotating shaft (73) is fixed to the bottom support position (8). The first rotating shaft (72) and the second rotating shaft (73) are rotationally connected through bevel gears. A second spiral fin (74) is arranged on the second rotating shaft (73). The second spiral fin (74) is located in the gas gathering space. The second spiral fin (74) is used to perform secondary centrifugation on the gas-liquid mixture.

2. The multi-stage gas-liquid separator according to claim 1, wherein: A fixing groove is arranged inside the upper shell (1) in the vertical direction. The liquid inlet (13) and the inner cavity exhaust port (11) are both communicated with the fixing groove, and the connecting end (52) matches the inner wall of the fixing groove; an external thread is arranged outside the upper shell (1), and a clamping block is arranged on the outer side of one end of the lower shell (2) close to the upper shell (1). The connecting piece is an external nut, and the external nut is sleeved at the joint of the upper shell (1) and the lower shell (2) and is threadedly connected with the upper shell (1) and is tightly fixed by the clamping block.

3. The multi-stage gas-liquid separator according to claim 2, characterized in that: A plurality of engaging parts (41) are arranged around the outer side of the mist catching net (4). A groove (22) matching the plurality of engaging parts (41) is arranged at one end of the lower shell (2) close to the upper shell (1). The engaging parts (41) are used for supporting the groove (22); the groove (22) is arranged in an L shape and includes an extension groove (23) opened in the radial direction of the inner wall of the lower shell (2), and the extension groove (23) is used for tightly fixing the engaging parts (41).

4. The multi-stage gas-liquid separator according to claim 3, wherein: The bottom support position (8) includes a plurality of fixing ribs (81) and a fixing ring (82). The fixing ring (82) matches the inner diameter of the lower shell (2); the plurality of fixing ribs (81) are arranged around the fixing ring (82), and the center of the fixing ring (82) is fixedly connected with the second rotating shaft (73); the lower conical plate is provided with insertion holes matching the plurality of fixing ribs (81), and the lower conical plate is clamped with the plurality of fixing ribs (81) through the insertion holes.

5. The multi-stage gas-liquid separator according to claim 1, wherein: The inner diameter ratio of the secondary separation tube (5) to the lower shell (2) is 1 / 2 - 1 / 3.

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