Three-phase separation device and sewage treatment system

Abstract

The utility model discloses a three-phase separation device and a sewage treatment system. The three-phase separation device comprises a shell, wherein an accommodating cavity is formed in the shell; the first chamber is arranged at the top of the accommodating cavity and is used for being communicated with a first discharge channel; the second cavity is arranged below the first cavity and communicated with the first cavity, an inlet channel is arranged on the cavity wall of the second cavity, and the inlet channel is configured to be used for conveying mixed materials into the second cavity and enabling the mixed materials to form rotational flow in the containing cavity; the third chamber is arranged below the second chamber and is communicated with the second chamber; and the filtering assembly is arranged between the second chamber and the third chamber. Compared with the prior art, the phase separation device and the sewage treatment system provided by the utility model have the advantages that the mixed material output by the biological tank can be separated, the condition of sludge accumulation on the surface of the sedimentation tank can be reduced, and the sludge is prevented from influencing the sewage treatment effect.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and more specifically, to a three-phase separation device and a sewage treatment system. Background Art

[0002] A certain amount of wastewater will be generated during the production of paper-making reconstituted tobacco. This wastewater is generally discharged in compliance with the standards using the process of pretreatment + IC anaerobic reactor + A / O biological pool + sedimentation tank + Fenton reaction pool.

[0003] The mixed material output by the biological pool is specifically a mixed solution of gas-sludge-liquid. At present, the mixed material output by the biological pool is directly output to the sedimentation tank. The specific gravity of the sludge is low, resulting in a large amount of floating sludge on the surface of the sedimentation tank. The floating sludge suspended on the surface of the sedimentation tank is difficult to clean. After accumulating for a certain period of time, it will produce odor and affect the effect of sewage treatment.

[0004] Therefore, there is an urgent need for a three-phase separation device and a sewage treatment system that can reduce the accumulation of sludge on the surface of the sedimentation tank and prevent the sludge from affecting the sewage treatment effect. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a three-phase separation device and a sewage treatment system, which can separate the mixed materials output from the biological pool, reduce the accumulation of sludge on the surface of the sedimentation tank, and avoid the sludge affecting the sewage treatment effect.

[0006] The technical solutions provided by this application are as follows:

[0007] A three-phase separation device, comprising:

[0008] A housing having an accommodating cavity therein;

[0009] A first chamber disposed at the top of the accommodating cavity and used for collecting a first material;

[0010] A second chamber is disposed below the first chamber and communicated with the first chamber, wherein an inlet channel is disposed on a chamber wall of the second chamber, and the inlet channel is configured to: transport the mixed material into the second chamber so that the mixed material forms a swirling flow in the accommodating chamber;

[0011] a third chamber disposed below the second chamber and communicating with the second chamber;

[0012] A filter component is disposed between the second chamber and the third chamber and is used to separate a third material.

[0013] Preferably, the mixed material flows into the second chamber through the inlet channel, and an initial direction of the mixed material entering the second chamber has a preset angle with a radial direction of the second chamber.

[0014] Preferably, an initial direction in which the mixed material enters the second chamber is perpendicular to a radial direction of the second chamber.

[0015] Preferably, the filter assembly comprises:

[0016] A coarse filter element disposed in the accommodating cavity and connected to the housing;

[0017] A fine filter element is arranged below the coarse filter element and fixedly connected to the housing.

[0018] Preferably, it also includes:

[0019] a first discharge channel communicated with the first chamber and used for discharging the first material;

[0020] a second discharge channel for discharging a second material, the second discharge channel being used to communicate with the second chamber, and an inlet of the second discharge channel being arranged above the inlet channel;

[0021] A third discharge channel is communicated with the bottom of the third chamber and is used for discharging the third material.

[0022] Preferably, the first discharge channel is used to discharge gas, the second discharge channel is used to discharge sludge, and the third discharge channel is used to discharge liquid.

[0023] Preferably, the third chamber is in a conical shape, and an inner diameter of the third chamber gradually decreases in a direction away from the second chamber.

[0024] Preferably, it also includes:

[0025] A viewing window is provided at the top of the first chamber.

[0026] A sewage treatment system, comprising the three-phase separation device described in any one of the above items;

[0027] a biological tank connected to the inlet channel for outputting the mixed material;

[0028] a sludge tank in communication with the second discharge passage;

[0029] A sedimentation tank is connected to the third discharge channel.

[0030] Preferably, it also includes:

[0031] A first channel for connecting the biological pool and the sedimentation pool, wherein the first channel is provided with a first switch;

[0032] a second channel for connecting the first channel with the inlet channel, wherein the second channel is provided with a second switch;

[0033] A third channel is used to connect the third exhaust channel with the first channel, and a third switch is arranged on the third channel.

[0034] The three-phase separation device provided by the utility model is firstly provided with a shell, a first chamber and a second chamber, wherein a receiving chamber is provided in the shell, the first chamber is provided at the top of the receiving chamber, the second chamber is provided below the first chamber, and the second chamber is communicated with the first chamber, and an inlet channel is also provided on the chamber wall of the second chamber, the inlet channel is communicated with the second chamber, and the inlet channel is configured to: be used for conveying the mixed material into the second chamber, the mixed material forms a vortex along the inner wall of the receiving chamber in the receiving chamber, and under the action of gravity, the mixed material can be layered in the mixing chamber according to the specific gravity of the material, and the first material with the lightest specific gravity enters the first chamber. Secondly, a third chamber and a filter assembly are also provided, wherein the third chamber is provided below the second chamber, and the third chamber is communicated with the second chamber, and the filter assembly is provided between the second chamber and the third chamber, and under the action of the filter assembly, the second material and the third material are separated, and the third material enters the third chamber through the filter assembly, and the second material is retained in the second chamber, thereby realizing the separation of the mixed material.

[0035] The mixed material discharged from the biological pool of the present application is specifically a three-phase mixed solution of gas, liquid and sludge. After the mixed material enters the second chamber through the inlet channel, the gas in the mixed material enters the first chamber, the sludge remains in the second chamber, and the liquid enters the third chamber. The liquid in the third chamber is transported to the sedimentation tank, which can reduce the accumulation of sludge on the surface of the sedimentation tank and avoid the sludge affecting the sewage treatment effect. It can be seen that compared with the prior art, the three-phase separation device in the embodiment of the utility model can separate the mixed material output from the biological pool, reduce the accumulation of sludge on the surface of the sedimentation tank, and avoid the sludge affecting the sewage treatment effect.

[0036] The present application also provides a sewage treatment system, including the above-mentioned three-phase separation device, which can also achieve the above-mentioned technical effects and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of a three-phase separation device provided in an embodiment of the utility model;

[0039] Figure 2 A cross-sectional schematic diagram of a second chamber provided in an embodiment of the utility model;

[0040] Figure 3 A structural schematic diagram of a sewage treatment system provided in an embodiment of the utility model.

[0041] Figure numerals: 1. shell; 2. first chamber; 3. second chamber; 4. inlet channel; 5. third chamber; 61. coarse filter element; 62. fine filter element; 71. first discharge channel; 72. second discharge channel; 73. third discharge channel; 8. visual window; 100. three-phase separation device; 200. biological pool; 300. sludge pool; 400. sedimentation tank; 500. first channel; 510. first switch; 600. second channel; 610. second switch; 700. third channel; 710. third switch. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and 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 therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0046] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0047] The embodiments of the present invention are written in a progressive manner.

[0048] like Figure 1 to Figure 2 As shown, an embodiment of the utility model provides a three-phase separation device, including a shell 1 with an accommodating chamber therein; a first chamber 2 arranged at the top of the accommodating chamber, the first chamber 2 is used to communicate with the first discharge channel 71; a second chamber 3 arranged below the first chamber 2 and communicated with the first chamber 2, an inlet channel 4 is arranged on the cavity wall of the second chamber 3, and the inlet channel 4 is configured to: transport the mixed material into the second chamber 3, and allow the mixed material to form a vortex in the accommodating chamber; a third chamber 5 arranged below the second chamber 3 and communicated with the second chamber 3; and a filter component arranged between the second chamber 3 and the third chamber 5.

[0049] The mixed material output from the biological pool is specifically a mixed solution of air-sludge-liquid. At present, the mixed material output by the biological pool is directly output to the sedimentation tank. A large amount of floating mud often appears on the surface of the sedimentation tank. The reason for the large amount of floating mud on the surface of the sedimentation tank is: the liquid level of the sedimentation tank is 4 meters high on the horizontal plane, and the mixed material in the biological pool enters the sedimentation tank from the bottom of the sedimentation tank, which will inevitably take away some aerobic bacteria in the biological pool. At the same time, the water volume in the pipeline is not always full. The self-flowing water (with aerobic bacteria) is mixed with the air in the pipeline to form internal flotation in the pipeline. The aerobic bacteria with lighter specific gravity are mixed with the bubbles. When they flow into the sedimentation tank, they are suspended on the upper surface of the sedimentation tank. Because the suspended aerobic bacteria cannot settle and be discharged, they accumulate for a certain period of time to form floating mud on the surface of the secondary sedimentation tank. It is difficult to clean the sludge suspended on the surface of the secondary sedimentation tank. After accumulating for a certain period of time, it will produce odor and affect the sewage treatment effect.

[0050] In order to solve the above problems, the three-phase separation device provided by the utility model is firstly provided with a shell 1, a first chamber 2 and a second chamber 3, wherein a accommodating chamber is provided in the shell 1, the first chamber 2 is provided at the top of the accommodating chamber, the second chamber 3 is provided below the first chamber 2, and the second chamber 3 is communicated with the first chamber 2, and an inlet channel 4 is also provided on the cavity wall of the second chamber 3, the inlet channel 4 is communicated with the second chamber 3, and the inlet channel 4 is configured as: for conveying the mixed material to the second chamber 3, the mixed material forms a vortex along the inner wall of the accommodating chamber in the accommodating chamber, and under the action of gravity, the mixed material can be layered in the mixing chamber according to the specific gravity of the material, and the first material with the lightest specific gravity enters the first chamber 2. Secondly, a third chamber 5 and a filtering component are also provided, wherein the third chamber 5 is provided below the second chamber 3, and the third chamber 5 is communicated with the second chamber 3, and the filtering component is provided between the second chamber 3 and the third chamber 5. Under the action of the filtering component, the second material and the third material are separated, and the third material enters the third chamber 5 through the filtering component, and the second material is retained in the second chamber 3, thereby realizing the separation of the mixed material.

[0051] After the mixed material discharged from the biological pool of the present application enters the second chamber 3 through the inlet channel 4, the gas in the mixed material enters the first chamber 2, the sludge remains in the second chamber 3, and the liquid enters the third chamber 5. The liquid in the third chamber 5 is transported to the sedimentation tank, which can reduce the accumulation of sludge on the surface of the sedimentation tank and avoid the sludge affecting the sewage treatment effect. It can be seen that compared with the prior art, the three-phase separation device in the embodiment of the utility model can separate the mixed material output from the biological pool, reduce the accumulation of sludge on the surface of the sedimentation tank, and avoid the sludge affecting the sewage treatment effect.

[0052] As a specific implementation method, the mixed material in the embodiment of the utility model enters the second chamber 3 through the inlet channel 4 and is separated. The mixed material enters the second chamber 3 along the initial direction at a certain speed and forms a vortex in the second chamber 3. At this time, there is a preset angle between the initial direction of the mixed material and the radial direction of the second chamber 3. The liquid with a larger specific gravity in the mixed material is thrown to the inner wall of the accommodating chamber by the inertial centrifugal force, and under the action of gravity, it falls to the bottom of the accommodating chamber with the downward vortex, and enters the third chamber 5 after being filtered by the filter assembly. The sludge with a smaller specific gravity becomes an ascending inner vortex and moves toward the top of the second chamber 3. An air column under negative pressure is formed in the center of the inner vortex, and the gas in the air column is released from the mixed material and enters the first chamber 2.

[0053] Furthermore, the preset angle between the initial direction of the mixed material and the radial direction of the second chamber 3 is specifically between 70° and 110°, preferably between 85° and 95°.

[0054] Furthermore, as one of the more preferred embodiments, the preset angle between the initial direction of the mixed material in the embodiment of the utility model and the radial direction of the second chamber 3 is specifically 90°. The mixed material enters the accommodating chamber along the tangent direction of the second chamber 3. Because the discharge port of the biological pool is higher than the inlet of the separator, the potential energy of the mixed material is converted into kinetic energy, and the mixture forms a vortex along the separator wall in the separator. According to the difference in specific gravity, the gas and most of the sludge in the mixed material can be separated.

[0055] As one specific implementation method, the filter component in the embodiment of the utility model includes a coarse filter element 61 and a fine filter element 62, wherein the coarse filter element 61 is arranged in the accommodating cavity, and the coarse filter element 61 is fixedly connected to the shell 1, the coarse filter element 61 is used to perform preliminary filtering on the mixed material in the second chamber 3, and the fine filter element 62 is arranged below the coarse filter element 61, and the fine filter element 62 is fixedly connected to the shell 1, and the mixed material is filtered again by the fine filter element 62.

[0056] Furthermore, the coarse filter element 61 and the fine filter element 62 in the embodiment of the utility model adopt any one of a baffle and a filter screen, which can be selected according to the use conditions.

[0057] As one of the specific implementations, the coarse filter element 61 in the embodiment of the utility model is preferably a baffle, and the two ends of the baffle are respectively connected to the two sides of the accommodating chamber, and the baffle includes a plurality of baffle blocks arranged at intervals along the cross-sectional direction of the accommodating chamber, and the distance between two adjacent baffle blocks is 10cm to 30cm. Among them, the baffle blocks include a first folding plate and a second folding plate connected to each other, and there is a certain angle between the first folding plate and the second folding plate, and the directions of the first folding plate and the second folding plate are different. When the mixed material hits the first folding plate at a certain speed, the first folding plate can be used to preliminarily separate the liquid with a heavier specific gravity from the gas. Under the action of gravity, the separated liquid hits the second folding plate and is further separated by the second folding plate, and the separation effect is better.

[0058] Furthermore, the baffle in the embodiment of the utility model is arranged at an angle, and the angle between the first folding plate and the axis of the accommodating cavity is specifically 55° to 65°.

[0059] Furthermore, the fine filter 62 in the embodiment of the utility model is preferably a filter screen, the filter gap of the filter screen is preferably 6 cm to 8 cm, and the filter screen is provided with small inclined plates with an interval of 6 cm to 8 cm, and the angle is specifically 60° to 80°, which is equivalent to a honeycomb inclined pipe network. It can further achieve the separation of mud, gas and water, the gas enters the first chamber 2, the mud floats on the top of the second chamber 3, and the water enters the third chamber 5.

[0060] In the above structure, as one of the embodiments, the three-phase separation device in the embodiment of the utility model further includes a first discharge channel 71, a second discharge channel 72 and a third discharge channel 73, wherein the first discharge channel 71 is used to communicate with the first chamber 2 for discharging the first substance in the first chamber 2, and the second discharge channel 72 is used to communicate with the second chamber 3 for discharging the second substance in the second chamber 3. The inlet of the second discharge channel 72 is arranged above the inlet channel 4, and the mixed material entering the accommodating chamber through the inlet channel 4 forms a vortex in the second chamber 3 for stratification. The first substance with the lowest specific gravity enters the first chamber 2, the second substance moves upward to the upper layer of the second chamber 3, and the third substance moves downward to the lower layer of the second chamber 3 and is filtered through the filter assembly; the third discharge channel 73 is connected to the bottom of the third chamber 5, and the third discharge channel 73 is used to discharge the third substance.

[0061] Furthermore, it should be noted that if the first substance is a gas, the first discharge channel 71 may be an opening disposed at the top of the accommodating chamber, or may be an air pipe. If the first substance is a non-toxic gas that can be discharged directly, the first discharge channel 71 may refer to the opening at the top of the accommodating chamber. If the first substance is a toxic gas that cannot be discharged directly, it may also be output to a subsequent gas treatment process through an air pipe.

[0062] More specifically, the three-phase separation device provided in the embodiment of the utility model is arranged between the biological pool and the sedimentation tank. When the mixed material discharged from the biological pool is separated by the three-phase separation device, the first substance is specifically gas, the second substance is specifically sludge, and the third substance is specifically liquid. That is, the first discharge channel 71 is used to discharge gas, the second discharge channel 72 is used to discharge sludge, and the third discharge channel 73 is used to discharge liquid.

[0063] Furthermore, as one implementation mode, the third chamber 5 in the embodiment of the utility model is specifically conical in shape, and the inner diameter of the third chamber 5 gradually decreases in the direction away from the second chamber 3 .

[0064] Furthermore, the second chamber 3 in the present practical embodiment is specifically cylindrical in shape.

[0065] As a more specific implementation, the three-phase separation device in the embodiment of the utility model further includes a visual window 8, wherein the visual window 8 is arranged at the top of the first chamber 2, and the operator can observe the situation in the accommodating chamber through the visual window 8.

[0066] Furthermore, the three-phase separation device in the embodiment of the utility model further comprises an upper cover, at least a portion of which is made of a transparent material, and the transparent upper cover forms a visual window 8 for the operator to observe intuitively.

[0067] As a specific implementation manner, the three-phase separation device in the embodiment of the utility model further includes a bracket, wherein the bracket is arranged at the bottom of the shell 1 for supporting the shell 1 .

[0068] As one specific implementation method, a maximum water level line is arranged on the inner wall of the accommodating cavity in the embodiment of the utility model.

[0069] Please Figure 3 As shown, the utility model also provides a sewage treatment system, including the above-mentioned three-phase separation device 100, a biological pool 200, a sludge pool 300 and a sedimentation pool 400, wherein the biological pool 200 is connected to the inlet channel 4, and the biological pool 200 is used to output the mixed material; the sludge pool 300 is used to communicate with the second discharge channel 72, and is used to receive the sludge discharged from the second chamber 3; the sedimentation pool 400 is connected to the third discharge channel 73, and is used to receive the liquid discharged through the third discharge channel 73. The sludge and gas in the mixed material are removed by the three-phase separation device 100, so as to prevent the floating mud from entering the sedimentation pool 400 to affect the removal efficiency of the sedimentation pool 400, and at the same time, the generation of odor in the sedimentation pool 400 can be effectively reduced.

[0070] In the above system, as one of the implementation modes, the sewage treatment system in the embodiment of the utility model also includes a first channel 500 for connecting the biological pool 200 and the sedimentation pool 400, and a first switch 510 is arranged on the first channel 500; a second channel 600 for connecting the first channel 500 and the inlet channel 4, and a second switch 610 is arranged on the second channel 600; a third channel 700 for connecting the third discharge channel 73 and the first channel 500, and a third switch 710 is arranged on the third channel 700.

[0071] Specifically, the separation of the mixed material discharged from the biological pool 200 by the three-phase separation device 100 specifically includes the following steps:

[0072] When the first switch 510 is turned on and the second switch 610 is closed, the mixed material output from the biological pool 200 enters the separator through the inlet channel 4 to form a vortex. Under the action of the filtering component, the floating sludge is in the upper layer of the second chamber 3, the gas enters the first chamber 2 and is discharged through the first discharge channel 71, and the filtered liquid enters the third chamber 5.

[0073] When the third switch 710 is turned on, the liquid enters the sedimentation tank 400 through the third discharge channel 73 .

[0074] The floating mud is observed through the visual window 8. When the floating mud in the second chamber 3 reaches a certain amount, the third switch 710 is closed. Under the action of the vortex, the floating mud enters the sludge pool 300 through the second discharge channel 72.

[0075] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-phase separation device, characterized in that: include, A housing (1) having an accommodating cavity therein; A first chamber (2) disposed at the top of the accommodating cavity and used for collecting a first material; A second chamber (3) is arranged below the first chamber (2) and communicated with the first chamber (2), an inlet channel (4) is arranged on the chamber wall of the second chamber (3), and the inlet channel (4) is configured to: transport the mixed material into the second chamber (3), so that the mixed material forms a swirling flow in the accommodating chamber; a third chamber (5) disposed below the second chamber (3) and communicating with the second chamber (3); A filter component is arranged between the second chamber (3) and the third chamber (5) and is used to separate a third material.

2. The three-phase separation device according to claim 1, characterized in that: The mixed material flows through the inlet channel (4) into the second chamber (3), and there is a preset angle between the initial direction of the mixed material entering the second chamber (3) and the radial direction of the second chamber (3).

3. The three-phase separation device according to claim 2, characterized in that: The initial direction in which the mixed material enters the second chamber (3) is perpendicular to the radial direction of the second chamber (3).

4. The three-phase separation device according to any one of claims 1 to 3, characterized in that: The filtering component comprises: A coarse filter element (61) disposed in the accommodating cavity and connected to the housing (1); A fine filter element (62) is disposed below the coarse filter element (61) and is fixedly connected to the housing (1).

5. The three-phase separation device according to claim 4, characterized in that: Also includes: A first discharge channel (71) communicated with the first chamber (2) and used for discharging a first material; a second discharge channel (72) for discharging a second material, the second discharge channel (72) being used to communicate with the second chamber (3), and an inlet of the second discharge channel (72) being arranged above the inlet channel (4); A third discharge channel (73) is communicated with the bottom of the third chamber (5) and is used to discharge the third material.

6. The three-phase separation device according to claim 5, characterized in that: The first discharge channel (71) is used to discharge gas, the second discharge channel (72) is used to discharge sludge, and the third discharge channel (73) is used to discharge liquid.

7. The three-phase separation device according to claim 5, characterized in that: The third chamber (5) is specifically in a conical shape, and the inner diameter of the third chamber (5) gradually decreases in a direction away from the second chamber (3).

8. The three-phase separation device according to claim 5, characterized in that: Also includes: A visual window (8) is provided on the top of the first chamber (2).

9. A sewage treatment system, characterized in that: A three-phase separation device (100) comprising any one of claims 5 to 8; A biological pool (200) connected to the inlet channel for outputting the mixed material; a sludge tank (300) in communication with the second discharge channel; A sedimentation tank (400) is connected to the third discharge channel.

10. The sewage treatment system according to claim 9, characterized in that: Also includes: A first channel (500) for connecting the biological pool (200) and the sedimentation pool (400), wherein the first channel (500) is provided with a first switch (510); a second channel (600) for connecting the first channel (500) with the inlet channel, the second channel (600) being provided with a second switch (610); A third channel (700) is used to connect the third discharge channel with the first channel (500), and a third switch (710) is provided on the third channel (700).

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