CN112871467B

CN112871467B - Gas protection system and gas protection method of centrifugal machine

Info

Publication number: CN112871467B
Application number: CN202011537273.1A
Authority: CN
Inventors: 王丽丽
Original assignee: Hebei Chemical and Pharmaceutical College
Current assignee: Hebei Chemical and Pharmaceutical College
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2022-07-15
Anticipated expiration: 2040-12-23
Also published as: CN112871467A

Abstract

The invention provides a gas protection system and a gas protection method of a centrifuge. The protective gas supply unit comprises a gas supply ring fixedly arranged in the centrifuge, a connection ring fixedly arranged on a filter basket of the centrifuge and a gas distribution pipeline which is arranged on the filter basket and is communicated with the connection ring. The gas supply ring and the connection ring are coaxial with the filter basket and are arranged oppositely, the gas supply ring is provided with a plurality of gas nozzles opposite to the connection ring, the connection ring is provided with a gas inlet, and protective gas sprayed out of the gas nozzles enters the connection cavity through the gas inlet and then enters the gas distribution pipe to be discharged through the gas outlet. The gas protection system of the centrifugal machine can improve the distribution effect of the protective gas in the centrifugal machine, thereby improving the explosion-proof protection performance of the gas protection system of the centrifugal machine.

Description

Gas protection system and gas protection method of centrifugal machine

Technical Field

The invention relates to the technical field of centrifuges, in particular to a gas protection system of a centrifuge. The invention also relates to a gas protection method.

Background

The centrifuge is an important device used for solid-liquid separation of materials in the fields of chemical industry, medicine and the like, and the principle of the centrifuge is that liquid in solid material flow is thrown out of a filter screen of a filter basket of the centrifuge by utilizing high-speed rotation to realize solid-liquid separation.

Because the centrifuge usually runs in an explosion-proof area, inert gases such as nitrogen and the like are needed to inflate the inner cavity of the centrifuge so as to form an explosion-proof gas protection system for the centrifuge.

In the existing gas protection system of the centrifugal machine, in the actual use process, a gas replacement device introduces protective gas such as nitrogen into the inner cavity of the centrifugal machine in a continuous large-flow mode, so that the oxygen content concentration of the inner cavity of the centrifugal machine meets the explosion-proof safety requirement. Meanwhile, the air outlet of the air supply pipeline in the centrifuge is arranged in a manner that the rotation of the filter basket and the occupied space of the filter basket are considered, so that the arrangement is limited, the number of arranged outlets is small, and the air route is simple. The gas supply to the centrifuge chamber is further increased to ensure that the protective gas is distributed over the entire chamber of the centrifuge in a timely manner. This not only causes the waste of nitrogen gas, and the performance of flame proof protection is influenced.

Disclosure of Invention

In view of this, the present invention is directed to provide a gas protection system of a centrifuge, so as to improve a distribution effect of a protection gas in the centrifuge, thereby facilitating an improvement of an explosion suppression protection performance of the gas protection system of the centrifuge.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a gas protection system of a centrifugal machine comprises a protection gas supply unit for supplying protection gas into the centrifugal machine and an oxygen content detection unit for collecting sample gas from the centrifugal machine to detect the oxygen content of the sample gas;

the protective gas supply unit comprises a gas supply ring which is communicated with a gas supply source of the protective gas and is fixedly arranged in the centrifuge, a connection ring which is fixedly arranged on a filter basket of the centrifuge, and a gas distribution pipeline which is arranged on the filter basket and is communicated with a connection cavity of the connection ring, wherein the gas distribution pipeline is provided with a gas outlet;

the gas supply ring and the connection ring are coaxial with the filter basket and are arranged opposite to each other, the gas supply ring is provided with a plurality of gas nozzles opposite to the connection ring, the connection ring is provided with a gas inlet, the protective gas sprayed out from the gas nozzles enters the connection cavity through the gas inlet, and can enter the gas distribution pipeline under the centrifugal action formed by the rotation of the filter basket and then is discharged from the gas outlet.

Furthermore, the gas distribution pipeline is two branches which are arranged in central symmetry by taking the axis of the filter basket as a center.

Further, the gas distribution pipeline extends along the end face of the filter basket in the radial direction, bends after reaching the side face of the filter basket, and extends to the front end of the filter basket from the side face of the filter basket; the air outlets are arranged on the air distribution pipeline at intervals.

Further, the air inlets are continuous annular openings.

Furthermore, a plurality of blades are arranged in the connection cavity at intervals around the axis of the connection ring, and the outer ends of the blades are inclined away from the corresponding radial direction against the rotation direction of the filter basket.

Furthermore, the protective gas supply unit has a first air supply pipeline and a second air supply pipeline which are respectively communicated with the air supply source, and the first air supply pipeline and the second air supply pipeline are controlled to be selectable to be communicated with the air inlet pipe.

Furthermore, a switching valve is arranged between the air inlet pipe and the first air supply pipeline and between the air inlet pipe and the second air supply pipeline, and a throttle valve is installed on the first air supply pipeline.

Furthermore, a first gas production point, a second gas production point and a third gas production point are arranged in the centrifuge corresponding to a discharge mechanism, a feeding pipeline and a liquid outlet unit of the centrifuge; the first gas production point, the second gas production point and the third gas production point are controlled to be alternatively communicated with a gas production main pipeline of the oxygen content detection unit.

Compared with the prior art, the invention has the following advantages:

according to the gas protection system of the centrifugal machine, the supplied protective gas is transmitted to the protective gas supply unit 3 through the gas supply ring and the connection ring rotating along with the filter basket, and the gas distribution pipeline rotates along with the filter basket in the centrifugal machine, so that the protective gas can be rapidly and uniformly distributed in the whole inner cavity of the centrifugal machine through the gas outlets formed in the gas distribution pipeline, the distribution effect of the protective gas in the centrifugal machine can be improved, and the explosion-proof protection performance of the gas protection system of the centrifugal machine is improved.

Meanwhile, a plurality of blades arranged at intervals are arranged in the connection cavity of the connection ring, so that the fan blades can be used, the connection ring rotates at a high speed along with the filter basket, and the protective gas entering the connection cavity forms high pressure in the gas distribution pipeline side of the connection cavity due to centrifugal action and the driving of the blades, so that the protective gas can smoothly enter the gas distribution pipeline communicated with the connection cavity and can be rapidly and uniformly discharged into the inner cavity of the centrifuge through the gas outlet.

Another objective of the present invention is to provide a gas protection method, which is applied to the gas protection system of the centrifuge of the present invention, wherein the gas supply unit of the centrifuge can respectively supply gas to the centrifuge through the first gas supply pipeline and the second gas supply pipeline; a first gas production point, a second gas production point and a third gas production point are arranged in the centrifuge corresponding to a discharge mechanism, a feeding pipeline and a liquid outlet unit of the centrifuge, and the first gas production point, the second gas production point and the third gas production point are controlled to be communicated with an oxygen content detection unit of the centrifuge; in the discharging stage of the centrifuge, the oxygen content detection unit detects the sample gas collected by the first gas collection point; in the liquid outlet stage of the centrifuge, the oxygen content detection unit detects the sample gas collected by the third gas collection point; in other operation stages of the centrifuge, the oxygen content detection unit detects the sample gas collected by the second gas collection point.

Furthermore, the air supply flow of the first air supply pipeline is smaller than that of the second air supply pipeline, and the second air supply pipeline supplies air to the centrifuge in the preparation stage, the discharge stage and the liquid outlet stage of the centrifuge; in other operation stages of the centrifuge, the centrifuge is supplied with gas from the first gas supply line.

Compared with the prior art, the gas protection method provided by the invention has the following advantages:

according to the gas protection method, through the arrangement of the two gas supply pipelines and the three gas production points, different gas supply pipelines can be used according to the requirements of the centrifuge on the protection gas in different operation stages, and the proper gas production points are selected according to key points of oxygen content increase easily occurring in the centrifuge in different stages so as to accurately monitor the oxygen content condition in the centrifuge, so that the gas supply to the centrifuge is adjusted in time, the explosion-proof protection performance of a gas protection system of the centrifuge is improved, and the consumption of the protection gas is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and to reference the drawings in a manner that enables them to be referred to, whether or not they are explicitly described or shown in their relative positions. In the drawings:

fig. 1 is a schematic view of an overall structure of a centrifuge according to a first embodiment of the present invention;

FIG. 2 is a schematic view of the centrifuge of FIG. 1 after removal of the housing and lid;

fig. 3 is a schematic perspective view of a connection ring and a gas distribution pipeline disposed on a filter basket according to a first embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a gas supply ring and a gas inlet pipe thereof according to a first embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a centrifuge according to a first embodiment of the present invention;

FIG. 6 is a partial enlarged view of portion A of FIG. 5;

FIG. 7 is a schematic diagram of the overall configuration of a gas shield system according to a first embodiment of the present invention;

description of reference numerals:

1. a centrifuge; 10. a rotating shaft; 11. a filter basket; 100. a machine cover; 101. a discharging mechanism; 102. a feed line; 103. a liquid outlet unit; 104. a bearing;

2. a shielding gas supply unit; 200. a first air supply line; 201. a second gas supply line; 202. a throttle valve; 203. a switching valve; 204. an air inlet pipe; 21. a gas supply ring; 210. an annular cavity; 211. an air jet port; 22. a docking ring; 220. an air inlet; 221. a blade; 222. a docking chamber; 23. a gas distribution pipeline; 230. an air outlet;

3. an oxygen content detection unit; 301. a first gas production point; 302. a second gas production point; 303. a third gas production point; 304. a first on-off valve; 305. a second on-off valve; 306. a third shutoff valve; 307. a gas production main pipeline; 308. and (4) exhausting the gas.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. are used based on the orientation or positional relationship shown in the drawings, they are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The embodiment relates to a gas protection system of a centrifugal machine, which can improve the distribution effect of protective gas in the centrifugal machine, thereby being beneficial to the improvement of the explosion-proof protection performance of the gas protection system of the centrifugal machine.

The gas protection system comprises a protection gas supply unit for supplying protection gas into the centrifugal machine and an oxygen content detection unit for collecting sample gas from the centrifugal machine to detect the oxygen content of the sample gas.

The protective gas supply unit comprises a gas supply ring which is communicated with a gas supply source of the protective gas and is fixedly arranged in the centrifuge, a connection ring which is fixedly arranged on a filter basket of the centrifuge, and a gas distribution pipeline which is arranged on the filter basket and is communicated with a connection cavity of the connection ring. An air outlet is arranged on the air distribution pipeline to discharge protective gas into the inner cavity of the centrifuge.

The gas supply ring and the connection ring are coaxially arranged with the filter basket and are arranged oppositely; the gas supply ring is provided with a plurality of gas nozzles which are opposite to the connection ring, the connection ring is provided with a gas inlet, the protective gas sprayed out of the gas nozzles enters the connection cavity through the gas inlet, and can enter the gas distribution pipeline under the centrifugal action formed by the rotation of the filter basket and then is discharged from the gas outlet.

Based on the above design concept, an exemplary structure of the centrifuge of the present embodiment is shown in fig. 1 and 2, and exemplary structures of the gas supply ring 21 and the connection ring 22 of the gas protection system are shown in fig. 3 to 6.

As shown in fig. 7, the centrifuge is provided with a shielding gas supply unit 2 and an oxygen content detection unit 3. The shielding gas supply unit 2 includes a shielding gas preparation function or introduces a shielding gas from the outside, and the shielding gas may be an inert gas such as nitrogen. The shielding gas supply unit 2 includes a gas feed ring 21 communicating with a gas supply source of the shielding gas, and the gas feed ring 21 is provided inside the centrifuge 1, and may be mounted on a casing of the centrifuge 1, for example. The gas supply ring 21 is connected to a gas inlet pipe 204, and the gas inlet pipe 204 penetrates the casing of the centrifuge 1 to be partially exposed to the outside of the centrifuge 1, and is connected to a gas supply source of the shielding gas.

Meanwhile, a connection ring 22 is fixedly installed on the filter basket 11 of the centrifuge 1, a gas distribution pipeline 23 is arranged on the filter basket 11, the gas distribution pipeline 23 is communicated with a connection cavity 222 of the connection ring 22, and a gas outlet 230 is formed in the gas distribution pipeline 23.

The air supply ring 21 and the connection ring 22 are both annular, and the rotating shaft 10 of the centrifuge 1 is mounted on the casing of the centrifuge 1 through a bearing 104, and is fixedly connected with the filter basket 11 after passing through the ring of the air supply ring 21, so as to drive the filter basket 11 to rotate and spin-dry the material. Meanwhile, the gas supply ring 21 and the connection ring 22 are coaxially arranged with the filter basket 11, and are arranged oppositely. As shown in fig. 2, fig. 3 and fig. 4, the gas supply ring 21 is provided with a plurality of gas nozzles 211 facing the connection ring 22, the connection ring 22 is provided with gas inlets 220, the protective gas ejected from the gas nozzles 211 enters the connection cavity 222 of the connection ring 22 through the gas inlets 220, and enters the gas distribution pipeline 23 due to the centrifugal action formed by the rotation of the filter basket 11, and is discharged into the inner cavity of the centrifuge 1 through the gas outlet 230.

The gas distribution pipeline 23 can change the position in the centrifuge 1 along with the rotation of the filter basket 11, so that the protection gas can be rapidly and uniformly distributed in the inner cavity of the whole centrifuge 1 by arranging a plurality of gas outlets 230 on the gas distribution pipeline 23; therefore, the number of the gas distribution pipes 23 can be reduced to a few or one. As shown in fig. 3 in combination with fig. 5, in the present embodiment, the gas distribution pipe 23 is two branches arranged in a central symmetry manner with respect to the axis of the filter basket 11. The two gas distribution pipelines 23 extend along the end surface of the filter basket 11 in the radial direction, are bent after reaching the side surface of the filter basket 11, and then extend to the front end of the filter basket 11 from the side surface of the filter basket 11. The air outlets 230 on the same air distribution pipeline 23 are a plurality of air distribution pipelines 23 arranged at intervals; preferably, one is provided near the inner end of the filter basket 11 and one is provided near the outer end (i.e., the side of the filter basket 11 close to the cover 100), and the air distribution pipeline 23 is bent at the outer end of the filter basket 11, and an air outlet 230 is provided at the tail end of the air distribution pipeline 23. The two branch gas pipelines 23 are arranged, so that the good dynamic balance performance of the filter basket 11 is favorably maintained, and the protective gas in the connection cavity 222 of the connection ring 22 can be uniformly thrown away and uniformly enter the two branch gas pipelines 23; the air distribution pipeline 23 is arranged along the outer surface of the filter basket 11, so that the drying of materials in the filter basket 11 is not influenced, and the air distribution pipeline 23 can extend to the front end of the filter basket 11, so that the arrangement of the air outlet 230 in the whole area of the inner cavity of the centrifuge 1 is facilitated.

Further, as shown in FIGS. 3 and 4, the gas inlet 220 is a continuous annular opening. The gas inlets 220 are formed as continuous annular openings, so that when the connecting ring 22 rotates with the filter basket 11, the gas outlets 211 of the gas supply ring 21 can still face the gas inlets 220, so that the protective gas entering the annular cavity 210 from the gas inlet pipe 204 can be sprayed from the gas outlets 211 and mostly enter the connecting cavity 222.

In order to improve the efficiency of the protective gas in the connection chamber 222 flowing into the gas distribution pipeline 23, a plurality of blades 221 are arranged in the connection chamber 222 at intervals around the axis of the ring connection ring 22, and the outer ends of the blades 221 are inclined away from the corresponding radial direction against the rotation direction of the filter basket 11. The plurality of blades 221 arranged at intervals are arranged in the connection cavity 222, so that the fan blades can be used, the connection ring 22 rotates at a high speed along with the filter basket 11, and the protective gas entering the connection cavity 222 forms high pressure inside the gas distribution pipeline 23 side of the connection cavity 222 due to the centrifugal effect and the driving of the blades 221, so that the protective gas can smoothly enter the gas distribution pipeline 23 communicated with the connection cavity 222, and is rapidly and uniformly discharged into the inner cavity of the centrifuge 1 through the gas outlet 230.

As shown in fig. 7, the centrifuge 1 is further provided with an oxygen content detecting unit 3, an oxygen content detecting instrument is arranged in the oxygen content detecting unit 3, the sample gas collected from the centrifuge 1 enters the oxygen content detecting instrument to detect the oxygen content in the sample gas, when the oxygen content exceeds a preset value, the explosion-proof performance in the centrifuge 1 is not satisfactory, and a shielding gas needs to be timely supplemented into the centrifuge 1 through the shielding gas supply unit 2.

In the present embodiment, the shielding gas supply unit 2 has a first air supply line 200 and a second air supply line 201 respectively communicated with the air supply source, and the first air supply line 200 and the second air supply line 201 are controlled to be alternatively communicated with the air inlet pipe 204. Set up first air supply line 200 and second air supply line 201 in the protective gas supply unit 2, through different pipe diameters or add and establish throttling arrangement, can make the flux of first air supply line 200 be less than the flux of second air supply line 201 to protective gas supplies the situation of change of demand to select different air supply lines in the centrifuge 1, does benefit to the consumption of saving protective gas.

Specifically, a switching valve 203 is provided between the intake pipe 204 and the first and second

air supply lines

200 and 201, and the switching valve 203 may be a three-position three-way or three-position five-way solenoid valve and may be switched among three states, i.e., the intake pipe 204 is cut off, the intake pipe 204 is connected to the first air supply line 200, and the intake pipe 204 is connected to the second air supply line 201. The first gas supply line 200 is provided with a throttle valve 202 for adjusting the ventilation flow of the first gas supply line 200, the first gas supply line 200 is used when a small flow of shielding gas is required in the centrifuge 1, and the second gas supply line 201 is used for supplying gas to the gas supply ring 21 when a large flow of shielding gas is required. Through the setting of choke valve 202 and diverter valve 203, can switch over first air supply line 200 or second air supply line 201 for the air inlet pipe 204 air feed in a flexible way to the air feed flow of adjustable first air supply line 200 makes the protective gas supply unit 2 be convenient for control, and can satisfy centrifuge 1 different ground protective gas supply requirements, does benefit to the use amount that saves protective gas.

In the sample gas collection pipeline configuration of the oxygen content detection unit 3, preferably, a first gas collection point 301, a second gas collection point 302 and a third gas collection point 303 are arranged inside the centrifuge 1 corresponding to the discharge mechanism 101, the feed pipeline 102 and the liquid outlet unit 103 of the centrifuge 1. As shown in fig. 1 and 7, the first gas collection point 301 is disposed near the discharge mechanism 101 to deal with the situation that the protective gas at the position is seriously lost and can become the highest position of the oxygen content in the centrifuge 1 at the discharge stage of the centrifuge 1; the second gas production point 302 is arranged near the feeding pipeline 102, and can obtain the oxygen content condition of the position near the center of the inner cavity of the centrifuge 1 (namely the position farthest from each gas outlet 230); the third gas collection point 303 is disposed near the liquid outlet unit 103 to deal with the situation that the protective gas at the position is seriously lost and becomes the highest position of the oxygen content in the centrifuge 1 during the liquid outlet stage of the centrifuge 1. The first gas production point 301, the second gas production point 302 and the third gas production point 303 are alternatively communicated with a gas production main pipeline 307 of the oxygen content detection unit 3 through branch pipelines. For example, a first on-off valve 304, a second on-off valve 305, and a third on-off valve 306 are respectively installed on each branch line. After sample gas at a certain collection point enters the oxygen content detection instrument through the gas production main pipeline 307, the detected tail gas is discharged to the outside through the exhaust pipe 308.

Set up second gas production point 302 in the feed line 102 department that is located centrifuge 1 inner chamber middle part, set up first gas production point 301 and third gas production point 303 in discharge mechanism 101, go out liquid unit 103 etc. because of the ejection of compact with go out the position that protective gas runs off easily, can form the gaseous oxygen content detection to the inside key point of centrifuge 1, according to centrifuge 1's different operation stage, select the oxygen content in the different gas production point detection gas, can form the accurate control to the gaseous condition of protective gas in centrifuge 1, in order to do benefit to the performance that promotes flame proof protection.

The gas protection system of the centrifuge, according to the embodiment, the gas supply ring 21 and the connection ring 22 rotating along with the filter basket 11 are fixedly arranged, the supplied protective gas is transmitted to the protective gas supply unit 23, and as the gas distribution pipeline 23 rotates along with the filter basket 11 in the centrifuge 1, the gas outlet 230 formed in the gas distribution pipeline 23 can be used for rapidly and uniformly distributing the protective gas to the whole inner cavity of the centrifuge 1, so that the distribution effect of the protective gas in the centrifuge 1 can be improved, and the improvement of the explosion-proof protection performance of the gas protection system of the centrifuge is facilitated.

Example two

The embodiment relates to a gas protection method of a centrifuge, which is applied to the gas protection system of the centrifuge described in the first embodiment.

Referring to the first embodiment, the shielding gas supply unit 2 of the centrifuge 1 may supply gas to the centrifuge 1 through the first air supply line 200 and the second air supply line 201, respectively. Corresponding to the discharging mechanism 101, the feeding pipeline 102 and the liquid outlet unit 103 of the centrifuge 1, a first gas sampling point 301, a second gas sampling point 302 and a third gas sampling point 303 are arranged in the centrifuge 1, and the first gas sampling point 301, the second gas sampling point 302 and the third gas sampling point 303 are controlled to be on or off by means of electromagnetic on-off valves and the like, and can be alternatively communicated with the oxygen content detection unit 3 of the centrifuge 1 so as to detect the oxygen content of the sample gas in the centrifuge 1.

In order to form accurate oxygen content measurement on the protective gas in the centrifuge 1, in the discharging stage of the centrifuge 1, the oxygen content detection unit 3 detects the sample gas collected by the first gas collection point 301; in the liquid outlet stage of the centrifuge 1, the oxygen content detection unit 3 detects the sample gas collected by the third gas collection point 303; in other operating phases of the centrifuge 1, the oxygen content detection unit 3 detects the sample gas collected at the second gas collection point 302. Meanwhile, in the two air supply pipelines of the shielding gas supply unit 2, the air supply flow of the first air supply pipeline 200 is smaller than the air supply flow of the second air supply pipeline 201, and the second air supply pipeline 201 supplies air to the centrifuge 1 in the preparation stage, the discharging stage and the liquid outlet stage of the centrifuge 1; during other operational phases of the centrifuge 1, the centrifuge 1 is supplied with air from the first air supply line 200.

Through the setting of two air supply lines and three gas production points, can use different air supply lines to protective gas's demand condition according to the different operation stages of centrifuge 1, according to the key point that the oxygen content increases easily appears in each different stage centrifuge 1, the oxygen content condition in proper gas production point is with accurate monitoring centrifuge 1 is being selected, thereby in time adjusting the air feed to centrifuge 1, do benefit to the flame proof barrier propterty that improves centrifuge's gas protection system, and help reducing the consumeing of protective gas.

By adopting the gas protection method of the embodiment, the consumption of the protective gas is reduced, and the explosion-proof protection performance of the gas protection system of the centrifugal machine can be improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A gas protection system of a centrifuge comprises a protection gas supply unit (2) for supplying protection gas into the centrifuge (1), and an oxygen content detection unit (3) for collecting sample gas from the centrifuge (1) to detect the oxygen content of the sample gas; the method is characterized in that:

the protective gas supply unit (2) comprises a gas supply ring (21) communicated with a gas supply source of the protective gas and fixedly arranged in the centrifuge (1), an access ring (22) fixedly arranged on a filter basket (11) of the centrifuge (1), and a gas distribution pipeline (23) arranged on the filter basket (11) and communicated with an access cavity (222) of the access ring (22), wherein a gas outlet (230) is formed in the gas distribution pipeline (23);

the gas supply ring (21) and the connection ring (22) are coaxial with the filter basket (11) and are arranged opposite to each other, a plurality of gas nozzles (211) opposite to the connection ring (22) are formed in the gas supply ring (21), a gas inlet (220) is formed in the connection ring (22), the protective gas sprayed out of the gas nozzles (211) enters the connection cavity (222) through the gas inlet (220), can enter the gas distribution pipeline (23) due to the centrifugal effect formed by the rotation of the filter basket (11), and is discharged through the gas outlet (230);

the gas supply ring (21) is communicated with a gas inlet pipe (204), and the gas inlet pipe (204) penetrates through the shell of the centrifuge (1) and is partially exposed out of the centrifuge (1) so as to be communicated with a gas supply source of the protective gas.

2. The gas protection system of a centrifuge according to claim 1, wherein: the gas distribution pipelines (23) are two branches which are arranged in a central symmetry mode by using the axis of the filter basket (11).

3. The gas protection system of a centrifuge according to claim 2, wherein: the gas distribution pipeline (23) extends along the end face of the filter basket (11) in the radial direction, bends after reaching the side face of the filter basket (11), and then extends to the front end of the filter basket (11) from the side face of the filter basket (11); the air outlets (230) are arranged on the air distribution pipeline (23) at intervals.

4. The gas protection system of a centrifuge according to claim 1, wherein: the air inlet (220) is a coherent annular opening.

5. The gas protection system of a centrifuge according to claim 1, wherein: a plurality of blades (221) which are provided with rings and are arranged at intervals around the axis of the connection ring (22) are arranged in the connection cavity (222), and the outer ends of the blades (221) are deviated from the corresponding radial direction against the rotation direction of the filter basket (11) and are arranged in an inclined manner.

6. Gas protection system for centrifuges according to any of claims 1-5, characterized in that: the protective gas supply unit (2) is provided with a first air supply pipeline (200) and a second air supply pipeline (201) which are respectively communicated with the air supply source, and the first air supply pipeline (200) and the second air supply pipeline (201) are controlled to be alternatively communicated with the air inlet pipe (204).

7. The gas protection system of a centrifuge according to claim 6, wherein: the air inlet pipe (204) with first air supply pipeline (200) with be equipped with diverter valve (203) between second air supply pipeline (201), install throttle valve (202) on first air supply pipeline (200).

8. The gas protection system of a centrifuge according to claim 6, wherein: a first gas production point (301), a second gas production point (302) and a third gas production point (303) are arranged in the centrifuge (1) corresponding to a discharge mechanism (101), a feeding pipeline (102) and a liquid outlet unit (103) of the centrifuge (1); the first gas production point (301), the second gas production point (302) and the third gas production point (303) are controlled to be communicated with a gas production main pipeline (307) of the oxygen content detection unit (3) alternatively.

9. A gas protection method of a centrifuge is characterized in that: the method is applied in a gas protection system of a centrifuge according to any of claims 1 to 8, wherein a protective gas supply unit (2) of the centrifuge (1) can respectively supply gas to the centrifuge (1) via a first gas supply line (200) and a second gas supply line (201); a first gas production point (301), a second gas production point (302) and a third gas production point (303) are arranged in the centrifuge (1) corresponding to a discharge mechanism (101), a feed pipeline (102) and a liquid outlet unit (103) of the centrifuge (1), and the first gas production point (301), the second gas production point (302) and the third gas production point (303) are controlled to be communicated with an oxygen content detection unit (3) of the centrifuge (1) alternatively; in the discharging stage of the centrifuge (1), the oxygen content detection unit (3) detects the sample gas collected by the first gas collection point (301); in the liquid outlet stage of the centrifuge (1), the oxygen content detection unit (3) detects the sample gas collected by the third gas collection point (303); in other operating phases of the centrifuge (1), the oxygen content detection unit (3) detects the sample gas collected at the second gas collection point (302).

10. The gas-protecting method according to claim 9, characterized in that: the air supply flow of the first air supply pipeline (200) is smaller than the air supply flow of the second air supply pipeline (201), and the second air supply pipeline (201) supplies air to the centrifuge (1) in the preparation stage, the discharging stage and the liquid outlet stage of the centrifuge (1); in other operating phases of the centrifuge (1), the centrifuge (1) is supplied with gas from the first gas supply line (200).