WO2011110053A1

WO2011110053A1 - Centrifugal vacuum degassing device and method

Info

Publication number: WO2011110053A1
Application number: PCT/CN2011/000369
Authority: WO
Inventors: 王文兵
Original assignee: 北京瞬节科技有限公司
Priority date: 2010-03-09
Filing date: 2011-03-08
Publication date: 2011-09-15
Also published as: CN102188840B; CN102188840A

Abstract

A centrifugal vacuum degassing device and method are provided. The device comprises a shell (100) defining an inner cavity. The shell (100) has a liquid inlet (200) for feeding the liquid to be degassed into the inner cavity and a gas evacuation outlet (400) for evacuating gas from the inner cavity. The gas evacuation outlet (400) is connected with a vacuum evacuation device. A rotary wheel device (104) is arranged between the liquid inlet (200) and the gas evacuation outlet (400) within the inner cavity and can rotate about a rotating axis (155). The rotary wheel device (104) is provided with a couple of gas sidewall (106) and liquid sidewall (108) facing each other along the direction of the rotating axis (155), between which a gas-liquid passage connecting the liquid inlet (200) with the gas evacuation outlet (400) is defined. A plurality of extending pieces (111, 112) in opposite directions are extended from the gas sidewall (106) and/or liquid sidewall (108) and used to stir the gas and liquid within the gas-liquid passage in the rotary wheel device (104) to generate a rotary motion. The gas and liquid are separated from each other under the centrifugal effect. The separated gas reaches the gas evacuation outlet (400), while the degassed liquid flows to a liquid collecting trough (107) under the effect of the centrifugal force. The liquid collecting trough (107) is located at the inner surface of the shell (100) in the vicinity of the rotary wheel device (104) and connected with a liquid outlet (300) for discharging the liquid.

Description

Centrifugal vacuum degassing device and method

Technical field

[01] The present application relates to a method and apparatus for removing a dissolved gas (including water vapor) in a liquid by applying a higher degree of vacuum in a centrifugal field. The technique of the present application is particularly suitable for various lubricating oils and insulating oils. The vacuum degassing and dehydration treatment of the hydraulic oil can of course be used in other occasions where the liquid needs to be vacuum degassed.

Background technique

[02] The process of vacuum degassing a liquid is usually to introduce the liquid into a closed vacuum tank with a certain degree of vacuum, and the volatile gas (including water vapor) in the liquid is volatilized into the space inside the vacuum tank. The vacuum device draws out the gas to maintain the vacuum inside the vacuum tank. The liquid falls to the bottom of the vacuum tank by gravity, and the vacuum tank is usually discharged by a pump. In order to improve the efficiency of equipment utilization, the usual vacuum processing system is continuously operated, that is, the key processes such as liquid entering the vacuum tank, evacuating the pump, and discharging the liquid at the bottom of the vacuum tank are continuously performed.

[03] Although the above vacuum treatment process has been widely used, it has obvious deficiencies, mainly because the vacuum tank has a large volume, and the entire system has many equipments, which is not economical. Of course, there have been some improved processes and equipment. For example, the utility model application "centrifugal vacuum degasser (application No. 200620025731. 2)" and utility model application "centrifugal vacuum degasser (application number 01232266. 0)" utility model application" centrifugal vacuum degasser (application number 89207335 7) "Disclosed a centrifugal vacuum degasser that uses vacuum to treat gases in drilling fluids. The invention patent application "method for controlling the combination of a centrifugal pump and a vacuum pump and a gas separation centrifugal pump (Application No. 96196 074. 4)" discloses another centrifugal pump for pumping pulp, which performs vacuum degassing while pumping A similar combination of a centrifugal pump and a vacuum pump is also disclosed in U.S. Patent Nos. 5,151,010, 5,152,663, 5,366,347, 5,842,833. In the application of the above patents, centrifugal vacuum equipment was used to replace the conventional vacuum tank and the bottom drain pump of the empty tank. Some of them also integrated the vacuum pump, which greatly reduced the volume of the treatment system. However, the above patented technology is mainly for degassing a liquid containing microbubbles, and is characterized in that a bubble-like gas already exists in the liquid, the gas is relatively easily removed, and the working vacuum is also low.

[04] The vacuum degassing process is widely used in the vacuum degassing of lubricating oils, insulating oils and hydraulic oils, especially for the removal of free and dissolved gases (including air and moisture). substance). The vacuum degassing unit is combined with the filter unit to form an oil purification treatment device, usually called a vacuum oil filter. When the vacuum degassing unit is working, the higher the vacuum, the more thorough the dehydration and degassing.

[05] According to the relationship between the vacuum degree in the vacuum tank and the boiling point of the liquid in the corresponding vacuum environment, this paper divides the vacuum state into

"Higher vacuum" and "lower vacuum". The higher vacuum referred to herein refers to the liquid entering the vacuum chamber under the vacuum condition. The experience produces a strong boiling phenomenon, so that a large amount of gas including water vapor can be quickly overflowed for the purpose of relatively rapid and thorough degassing and dehydration; while the lower vacuum described herein refers to the vacuum. Under the condition, the liquid entering the vacuum chamber does not have a strong boiling phenomenon, and the volatile gas such as water vapor is mainly removed by increasing the specific surface area of the liquid in the vacuum tank, mainly by evaporation of the surface of the liquid gas.

[06] Existing vacuum oil filters are all degassed using a vacuum tank. In the actual operation of the existing vacuum oil filter, higher vacuum work also brings some negative problems.

[07] First, under higher vacuum conditions, the gas becomes very thin and bulky. When there is more gas in the oil, serious foam problems can occur in the vacuum tank. When the foam is long, a large amount of foamy oil can easily enter the vacuum pump from the vacuum tube at the top of the vacuum tank, causing a serious oil accident, which may cause very serious consequences in some cases. Although the installation of a foam detection sensor in a vacuum tank can detect and avoid the problem of running oil, the bubble detection sensor sometimes produces an error signal.

[08] The second is that under high vacuum conditions, the oil drain pump at the bottom of the vacuum tank works in a very unfavorable state due to the small static pressure head of the oil and the large volume of the oil foaming. The noise and vibration are large, and the cavitation The problem is serious and it is impossible to work reliably for a long time.

[09] The third is that under certain conditions, when the vacuum oil filter is operated at a higher vacuum, the percentage of water vapor in the evolved gas is higher. The vacuum pump selected by some equipment cannot remove such a high concentration of water vapor. .

[10] In order to avoid the above problems, most vacuum oil filter machines usually release some air to the vacuum system through manual adjustment valves or automatic gas ballast valves during actual operation, and properly reduce the vacuum degree of the system to maintain the normal operation of the equipment. Running. However, this will significantly reduce the vacuum in the vacuum tank, seriously affecting the efficiency of the entire vacuum degassing system.

[11] In order to compensate for the low efficiency of degassing and dehydration under low vacuum conditions, most vacuum oil filters are equipped with high-power heaters, usually heating the oil to 50-80 ° C to obtain a relatively satisfactory degassing Dehydration efficiency. However, high-power heating is at the expense of wasting energy. Obviously, it is contrary to the concept of energy saving and environmental protection.

[12] Due to possible safety hazards such as running oil, most domestic vacuum oil filters need to be on duty at the time of operation, that is, the operator cannot leave the running oil filter.

[13] utility model patent "vacuum oil filter gas mixing and dehydration device" (CN200820100047. 5) is an optimization scheme based on heating and aeration technology, using aeration to increase the surface area of the liquid in the vacuum tank to improve dewatering efficiency, It is a typical representative of better prior art.

Summary of the invention

[14] To this end, the present invention provides a centrifugal vacuum degassing apparatus comprising a housing defining an inner chamber, the housing having a liquid inlet for inputting a liquid to be degassed into the inner chamber and a An air suction port for extracting gas from the inner cavity, the air suction port is configured to be connected to an evacuation device, and a rotation axis is disposed between the liquid inlet port and the air suction port in the inner cavity a rotating wheel device having a pair of side walls facing each other in the direction of the rotation axis, one of which One side wall is adjacent to the air suction port and is called a gas side wall, and the other side wall is called a liquid side wall. The wheel device defines a gas-liquid passage between the liquid side wall and the air side wall. From the liquid inlet to the suction port, a plurality of extension members projecting from the gas side wall and/or the liquid side wall for agitating gas and liquid in the gas-liquid passage in the rotating device The rotary motion is generated, the gas and the liquid are separated from each other by centrifugation, the separated gas reaches the suction port, and the degassed liquid flows under centrifugal force to the inner surface of the casing adjacent to the rotating device. a sump, the sump is connected to a liquid outlet for discharging liquid.

[15] The present invention also relates to a liquid centrifugal vacuum degassing method comprising the following steps:

(a) injecting a liquid into a container, the liquid forming a liquid level surface in the container, that is, an interface between the liquid phase and the gas phase, the container defining a gas phase space and a liquid phase above and below the liquid level surface Space

(b) evacuating the gas phase space from a position in the gas phase space away from the liquid level surface. This position is called pumping. The vacuum is applied to the container to dissolve the dissolved gas and volatile substances in the liquid from the liquid. Out, when the gas escapes, the gas is entrained with foam and liquid droplets, thereby forming a gas-liquid two-phase mixture and entering the gas phase space, forming a gas-liquid two-phase flow of the mixture flowing to the suction port;

(c) passing the gas-liquid two-phase flow through a wheel device disposed between the suction port and the liquid level surface to rotate about an axis of rotation, the wheel device driving the gas-liquid two-phase The high-speed rotation of the flow causes centrifugal force to be strongly separated into gas and liquid, and the separated gas flows from the rotary device to the suction port;

(d) The separated gas is withdrawn from the suction port, and the liquid drawn by the centrifugal force is returned to the liquid phase space of the container or sent out of the container.

[16] The present invention utilizes centrifugal force generated in a rotating wheel chamber in a vacuum chamber to suppress a large amount of foam generated by a liquid under a relatively high vacuum condition; the structure of the rotating wheel device is designed to "fall" the liquid in a centrifugal field. In the "drop" process, the gas in the liquid can be released more fully to promote the separation of the liquid and the gas; the outer edge of the runner device is designed with an impeller and volute structure similar to a centrifugal pump, or a centrifugal vortex The structure of the pump can discharge the vacuum-treated liquid to the vacuum chamber at a certain pressure; the flashed gas is further separated from the entrained liquid droplets through the gas centrifugal purification zone; and the generated gas is continuously extracted by the vacuum pump at the gas outlet, To maintain the vacuum chamber maintained at a higher vacuum.

[17] High-efficiency gas-liquid separation of higher vacuum in a centrifugal field in a revolving device is a core of the present invention. Under the action of the centrifugal force, the gas and liquid boiling in a higher vacuum environment are thrown to the outside of the runner device. The liquid specific gravity is much larger than that of the gas, and is concentrated on the outside by the centrifugal force, and can flow out from the outside of the runner device. In order to conveniently discharge the liquid out of the vacuum chamber, the outer side of the runner device is designed as the impeller structure of the centrifugal pump, and the vacuum chamber casing close to the impeller is designed as a centrifugal pump volute structure, which can conveniently transport the degassed liquid. Exit the vacuum chamber. The gas released in the reel device is subjected to much less centrifugal force and is concentrated at the opposite inner side and can be led out from the side of the reel device.

[18] In order to facilitate the description of the technology for implementing the present invention, the structure of the runner device can be roughly divided into three functional areas, namely, a gas-liquid mixed flash zone, a liquid centrifugal delivery zone, and a gas centrifugal purification zone; [19] Main working principle of gas-liquid mixed flash zone: Introduce the liquid to be treated in the gas-liquid mixed flash zone of the runner device, and transmit a certain peripheral velocity to the liquid during rotation, so that the liquid is under the action of centrifugal force Lateral movement. The liquid introduced into the reel device can be designed to eject the liquid obliquely in a direction of rotation with a set of nozzles, so that the liquid has a certain initial velocity when entering the reel device, thereby improving energy utilization. The number of nozzles is preferably 2-8, preferably 2-4.

[20] In a rotating gas-liquid mixed flash zone, the liquid to be degassed is strongly boiled under high vacuum conditions and evaporates rapidly, producing a large volume of gas with a low volume and low density. In this area, the structure of the runner device can be varied and can be designed in almost any regular or irregular shape, as long as the liquid with bubbles can pass smoothly and the gas can be separated. The basic requirements of the application of the present invention can be met.

[21] The degassed liquid flows to the liquid centrifugal delivery zone outside the reel unit. The centrifugal delivery area of the runner device is designed as a suitable centrifugal pump impeller structure, and the corresponding position of the vacuum chamber casing is designed to be the volute structure of the centrifugal pump. The separated liquid can be pressurized with the principle of a centrifugal pump. The vacuum chamber is sent out. As an alternative to the centrifugal pump structure, the centrifugal pump structure can also be changed to the structure of a centrifugal vortex pump, and the degassed liquid can also be pumped out of the vacuum chamber by centrifugal force.

The beneficial effects of the invention:

[22] The above technical solution better solves the problems of the prior art that the risk of running oil is large, the volume is large, the heating power is large, etc. The vacuum oil filter machine adopting the technology has small volume and low operating energy consumption. In the case of automatic control of the programmable controller (PLC), it can be operated unattended, and the technical and economic advantages are significant.

[23] The present technology also involves some other related technologies in implementing applications.

[24] First, the transfer of power to a vacuum chamber with a higher vacuum involves vacuum sealing technology. At present, the common vacuum transmission technology includes magnetic transmission technology and magnetic fluid seal transmission technology. The immersion motor or shielded motor can also be used to directly place the power unit into the vacuum chamber. These sealed transmission technologies are rigorous and reliable. In addition, some mechanical sealing techniques can be applied, but the heat dissipation of the sealing surface needs to be solved.

[25] Secondly, for the generation of higher vacuum, there are also many types of vacuum pumps that can be selected, mainly based on the designed vacuum and the pumping flow rate and the composition of the gas. Vacuum pumps commonly used in vacuum oil filters include liquid ring vacuum pumps, rotary vane vacuum pumps, slide valve vacuum pumps, claw vacuum pumps, and screw types. If more water vapor needs to be extracted, most of the water vapor can be condensed and separated by a condensing method of the refrigerator, and the remaining gas is extracted by the vacuum pump, which can reduce the adverse effect of the water vapor on the vacuum pump and reduce the working load of the vacuum pump.

[26] In addition, in order to make the technology of the present invention a complete and practical product, in addition to the aforementioned components of a degassing unit such as a vacuum chamber or a vacuum pump including a reel device, a filter, a pipe and a valve are required, Sensors such as flow pressure and temperature, electronic control units with PLC, and bases can be used to form a practical vacuum oil filter. These supporting facilities are available in a variety of technical options. Those skilled in the industry can combine the specific applications with experience. Preferably, a suitable product is provided in conjunction with the degassing unit of the present invention and will not be described in detail herein.

[27] The technical solutions of the present application are further described below with reference to the accompanying drawings.

DRAWINGS

Figure 1 is a perspective view of the outer contour of a centrifugal vacuum degasser of the present invention.

[29] Figure 2 is a block diagram of an optimized implementation of an oil-impeding motor-driven runner.

Figure 3 is an enlarged view of the runner device of Figure 2;

4 is a structural view of another embodiment of a reel device.

Figure 5 is a block diagram showing still another embodiment of the reel device.

Figure 6 is a block diagram showing still another embodiment of the reel device.

detailed description

[34] The embodiment shown in FIG. 2 is a structural view of a degassing device for driving an optimized embodiment of the reel device 104 with an oil immersion motor 150, the optimized application of which is the degassing of the insulating oil and Dehydration, of course, can also be used in some other suitable occasions. The following is an example of insulating oil. The upper end of the degassing device is connected to the pipe port or the suction port 400 of the vacuum pump, the side is the liquid outlet or the liquid suction port 300, and the lower portion is the oil inlet port or the liquid inlet port 200. After the vacuum pump is started, the insulating oil to be treated enters from the oil inlet 200 at the lower portion of the device, and the gas-liquid mixture flashes into the runner device 104 through the gap between the outer casing of the oil-immersing motor 150 and the casing 100 of the degassing device. Steaming area. The gas evaporates quickly under the action of a higher vacuum in the runner. Under the action of centrifugation, the liquid in the gas-liquid mixed flash zone flows or emanate radially outward, and after reaching the liquid centrifugal delivery zone, the oil is sent out by the principle of a centrifugal pump. The gas enters the gas centrifugal purification zone through the opening of the gas wall of the gas-liquid mixed flash zone. In the gas centrifugal purification zone, a small amount of oil droplets carried in the gas are sucked to the outside by the centrifugal force, and are merged with other liquids through the gap between the runner device and the volute 107 of the deaerator. The fluid at the outlet has a certain pressure and can be connected to the filter via the line valve system. The purified gas is connected to the vacuum pump inlet via a piping system to achieve rapid gas-liquid separation under high vacuum conditions.

[35] As shown in Fig. 1, a vacuum centrifugal degasser includes a casing 100, a liquid inlet 200, an exhaust port 400, and a liquid outlet 300.

As shown in Fig. 2, the housing 100 defines a hollow interior that is covered by an upper cover 130 to seal. A power unit 150 such as a motor is mounted in the inner chamber, and the power unit is fixed to the casing 100.

[37] The power unit 150 has an output shaft 102 having an axis of rotation 155. A rotary wheel device 104 is fixedly mounted on the output shaft 102, and the rotary wheel device 104 is located in the hollow inner cavity. The wheel device 104 There are two radially extending side walls 106 and 108, of which the side wall 106 is adjacent to the suction port 400, referred to as the air side wall; and the other side wall 108 is referred to as the liquid side wall. .

A plurality of concentric annular plates 112 project upwardly from the liquid side wall 108, and a plurality of concentric annular plates 111 project downwardly from the gas side walls 106. The annular plates 111 and 112 are interposed with each other but do not touch the opposite side walls 106 and 108.

A plurality of through holes 116 are formed in the gas side plate 106, thereby allowing the suction port 400 to communicate with the gas and liquid passages defined by the gas wall 106, the liquid side wall 108, and the annular plates 111, 112.

[40] A plurality of vanes 122 are formed above the gas wall 106, which on the one hand exert a circular motion on the gas or gas-liquid mixture between the vanes and on the other hand provide a radial flow passage for these gases or gas-liquid mixtures.

The working principle of the centrifugal degasser of the present invention will now be described. Liquid is injected into the interior of the housing 100 through the inlet port 200, where the liquid contains dissolved gases, moisture, and other volatile materials. The inner cavity of the housing 100 is evacuated by the air suction port 400, and the motor 150 is actuated to rotate the rotary wheel device 104. Under the action of the vacuum of the cavity, the dissolved gas and moisture and the volatile matter begin to form bubbles which, along with the liquid, enter the wheel device 104 in the direction indicated by the arrow 101, that is, into the gas wall 106, the liquid side wall 108, and The annular plates 111 and 112 define a gas-liquid passage.

[42] The gas-liquid mixture entering the gas-liquid passage is rotated by the runner device 104, and under the strong action of the centrifugal force, the gas-liquid mixture is accelerated to be separated into gas and liquid, because the liquid density is larger than the gas. More, especially in high vacuum environments.

[43] Therefore, the liquid flows and gathers radially outward through the tortuous path formed between the rings i l l and 112 (such as an arrow)

105 is shown), and the evolved gas is collected in the plenum space 118 in the reel unit 104, and the gas is thereby discharged to the suction port 400 in the direction of the arrow 103 via the through hole 116 in the gas wall 106. Thereby, the liquid is continuously degassed, and the evolved gas is continuously withdrawn from the inner cavity of the casing 100.

[44] The gas sent from the runner device 104 through the through hole 116 may still be more or less entrained with liquid, where the gas-liquid mixture is rotated by the blades 122 and further subjected to centrifugal separation.

[45] In the sump 107 in which the continuously separated liquid in the reel device 104 is swung radially from the inner wall of the casing 100, the liquid should be withdrawn in time. To this end, a portion of the casing 100 surrounding the revolving device 104 is formed in the shape of a volute, that is, an annular sump 107, and the sump is in communication with the liquid outlet 300.

4 shows another embodiment of the present invention, which differs from the embodiment shown in FIGS. 2 and 3 in that the concentric annular plate 111 of FIGS. 2 and 3 is replaced by a bolt and a post 126. 112.

Figure 5 shows a further embodiment of the invention, which differs from Figures 2 and 3 in that the concentric annular plates 111 and 112 of Figures 2 and 3 are replaced by blades 128, with concentric cone panels. 129 and the gap 116' therebetween replace the gas side plate 106 of Figures 2 and 3 and the through hole 116 therein.

Figure 6 shows a further embodiment of the invention, where the spiral plate 128 replaces the concentricities shown in Figures 2 and 3. Annular plates 111 and 112.

[49] In the above embodiment of the reel device, the liquid centrifugal delivery zone is located radially outward of the gas-liquid mixed flash zone, and the gas centrifugal purification zone is located above the gas-liquid mixed flash zone. Another solution is that the structure of the runner device is that the gas centrifugal purification zone, the gas-liquid mixed flash zone, and the liquid centrifugal delivery zone are radially arranged from the inside to the outside, because the structural principle of each zone is the same, More details will be described.

[50] Of course, the structure of the gas-liquid mixed flash zone will have a greater impact on the working effect. According to different application conditions, optimization can be performed. For example, in the case where the foaming phenomenon is not serious, in order to improve the effect of the degassing separation, the gas-liquid mixed flash zone of the runner device shown in FIG. 2 and FIG. 3 is designed to gradually drop the liquid in the centrifugal field, step by step. Separate structure. The gas-liquid mixing flash zone of the runner device shown in Fig. 4 is designed with a plurality of cylinders, and the gas-liquid mixed flash zone generally has a relatively smooth flow passage, and can be adapted to applications with relatively more foam. In the case where the liquid produces too much gas, particularly in the case of excessive foam, the area can be designed to resemble a centrifugal pump impeller to speed up liquid discharge. In short, as long as the effect of transferring energy to the liquid, evaporating and separating the liquid, and adapting to the actual working condition can be realized, the change of the linear structure of the gas-liquid mixed flash zone can be said to be endless, continuous or intermittent, regular or irregular, It is possible to open or not open the blade, and even a porous filler can be placed. The specific structure of the gas-liquid mixed flash zone cannot be completely listed here.

[51] The gas separated by evaporation enters the gas centrifugal purification zone. The gas centrifugal purification zone plays an important role in preventing liquid from entering the vacuum pump from the vacuum line. As shown in Fig. 2 and Fig. 3, the separated gas is further subjected to gas-liquid separation through a plurality of rotating blades integrated with the rotating device, thereby ensuring that the gas flowing from the vacuum chamber to the vacuum pump is hardly contained. liquid. The blades of the gas centrifugal purification zone can also have many shapes, but the straight blades are the simplest and most practical. The number of blades may also be more or less, but too small a number will reduce the gas-liquid separation effect, and an excessive amount will increase the weight of the runner device and affect the smooth flow of the gas. In general, the number of blades can be selected from 3 to 40 pieces, preferably from 6 to 16 pieces.

[52] The above-mentioned structure of the runner device composed of the gas-liquid mixed flash zone, the liquid centrifugal delivery zone, and the gas centrifugal purification zone has been optimized for various applications, and it is easy to ensure safe and reliable operation of the equipment. However, the division of these functional areas is divided for ease of description. It is relatively speaking. Sometimes they can be crossed. For example, in the gas-liquid mixed flash zone, there may be the same blades as the centrifugal pump. It can extend all the way to the liquid centrifugal delivery zone; the blades of the gas centrifugal purification zone can also extend to the gas-liquid mixed flash zone.

[53] The above-mentioned revolving device can also be applied in a combination of a plurality of parallels or the like.

The drawings and the description of the drawings are merely specific embodiments of the invention. It will be apparent that those skilled in the art can make various modifications to the specific embodiments in accordance with the inventive concept.

Claims

Claim t,

A centrifugal vacuum degassing device comprising a housing defining an inner chamber, the housing having a liquid inlet for inputting a liquid to be degassed into the inner chamber and a chamber for extracting from the inner chamber a suction port of the gas for connecting to a vacuuming device, wherein a rotating wheel device rotatable about an axis of rotation is disposed between the liquid inlet and the suction port in the inner cavity, The turning device has a pair of side walls facing each other in the direction of the rotation axis, one of the side walls abutting the suction port and being referred to as a gas side wall, and the other side wall is referred to as a liquid side wall, The runner device defines a gas-liquid passage between the liquid side wall and the gas side wall to fluidly communicate the liquid inlet to the suction port, and protrude from the gas side wall and/or the liquid side wall , for stirring the gas and liquid in the gas-liquid passage in the rotating device to make a rotary motion, the gas and the liquid are separated from each other by centrifugation, and the separated gas reaches the suction port, and the degassed liquid is Flowing to the runner with centrifugal force A sump at the inner surface of the casing adjacent to the apparatus, the sump being connected to a liquid outlet for discharging the liquid.

2. The apparatus according to claim 1, wherein a plurality of through holes are formed in the side wall of the gas, so that a gas-liquid passage defined by the turning device is in communication with the air suction port.

3. The device according to claim 1 or 2, wherein the sump is shaped to: cooperate with the structure and rotation of the runner device to generate a certain pressure on the liquid in the sump, forcing The liquid here flows out of the inner cavity of the housing through the liquid outlet.

4. The device according to claim 3, wherein the projecting member is an annular plate extending from the air side wall and the liquid side wall and surrounding the rotation axis, and the opposite protrusions The annular plates are interpenetrated in the direction of the axis of rotation, but there is still a certain gap from the opposite side walls.

5. Apparatus according to claim 4 wherein a gap is formed between the sealing plate extending radially inwardly from the housing and the liquid side wall of the wheel means.

6. Apparatus according to claim 5 wherein a plurality of vanes are mounted axially outwardly from the airwall of the runner assembly, said vanes being 6-16, evenly distributed circumferentially.

The device according to claim 4, wherein the position of the through hole on the air side wall is located at the outermost two adjacent annular plates among the annular plates extending on the air side wall between.

8. A liquid centrifugal vacuum degassing method comprising the steps of: (a) injecting a liquid into a container, the liquid forming a liquid level surface in the container, that is, an interface between the liquid phase and the gas phase, the container defining a gas phase space and a liquid phase above and below the liquid level surface space;

(b) evacuating the gas phase space from a position in the gas phase space away from the liquid level surface, the position being called a pumping port, and vacuuming the container to allow gas and volatile substances dissolved in the liquid to escape from the liquid, When the gas escapes, the gas is entrained with foam and droplets, thereby forming a gas-liquid two-phase mixture and entering the gas phase space to form a gas-liquid two-phase flow of the mixture flowing to the suction port;

9. The method according to claim 8, wherein the liquid sucked to the inner wall of the container by the centrifugal force flows under gravity to the liquid phase space of the container.

10. The method according to claim 8, wherein the liquid drawn by the centrifugal force is accumulated in the volute formed around the rotating device of the container and forms a hydrostatic pressure, and the accumulated liquid is in the It is returned to the liquid phase space of the container by static pressure or sent out of the container.

The method according to any one of claims 8 to 10, wherein the rotating wheel device in the step (c) defines a radial tortuous path for the gas-liquid two-phase flow, so that the gas-liquid two-phase flow Flowing outside the revolving device along the tortuous path under the action of centrifugal force.

12. The method according to any one of the preceding claims, wherein, as the two-phase flow and the separated liquid flow along the radial meandering passage, the separated gas simultaneously escapes from the meandering passage and flows to the Pumping port.