Horizontal screw centrifuge with odor extraction device at liquid outlet

Abstract

The utility model discloses a horizontal screw centrifuge with a liquid outlet provided with an odor extraction device. The horizontal screw centrifuge comprises a base, a housing covering the base, a rotary drum rotatably connected to the base, a screw propeller rotatably connected to the interior of the rotary drum, the liquid outlet is formed in the base, and the odor extraction device is installed at the liquid outlet. The odor extraction device comprises a vertical cylinder, a connecting bent pipe is fixed to the middle of the odor extraction device, the inlet end of the connecting bent pipe and the liquid outlet are installed together, a first taper pipe with the small upper portion and the large lower portion is fixed to the top end of the vertical cylinder, and a second taper pipe with the small lower portion and the large upper portion is fixed to the bottom end of the vertical cylinder. Mounting flanges are fixed at the top end of the first taper pipe and the bottom end of the second taper pipe; and an air extractor is mounted on the mounting flange at the top end. The device can perform odor removal treatment on the separated clarified liquid, and is worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to a centrifuge, in particular to a horizontal screw centrifuge with a liquid outlet provided with an odor extraction device. Background Art

[0002] The horizontal spiral decanter centrifuge is abbreviated as horizontal spiral centrifuge. It is a highly efficient centrifugal separation equipment. The working principle of the horizontal spiral centrifuge is as follows: the raw liquid (sludge that has been mixed with flocculants) enters the feed section of the screw propeller axially from the rotation center of the centrifuge through the feed pipe. It is accelerated and redirected by the accelerating cone inside the high-speed rotating spiral body, and the various liquids are evenly mixed and thrown radially into the high-speed rotating drum. Under the action of the centrifugal force field that is thousands of times greater than gravity, the solid phase with a larger specific gravity in the raw liquid quickly settles to the wall of the drum, while the clear liquid with a smaller specific gravity is squeezed to the center of the drum. The centrifuge drum and the screw propeller rotate at high speed in the same direction, but their speeds are different, and there is a certain speed difference. Due to the speed difference between the drum and the screw propeller, the solid phase is pushed to the cone outlet by the screw propeller and discharged out of the machine, while the clear liquid, under the push of the raw liquid that continuously enters the centrifuge, passes through the overflow hole at the large end of the drum to the liquid outlet and is discharged out of the machine. The clear liquid discharged through the liquid outlet may contain odor or toxic gas dissolved in it, which will be mixed in the discharged clear liquid and collected together, so that the collected clear liquid will emit a foul odor and possible toxic gas will evaporate.

[0003] Chinese utility model patent CN 214183590 U discloses a high-dryness horizontal screw centrifuge, which includes a cover shell, a drum rotatably connected inside the cover shell, and a spiral propeller rotatably connected inside the drum with a speed difference from that of the drum; the drum and the spiral propeller are both driven to rotate by a motor, the drum includes a pipe and a connected second conical tube, the taper direction of the pipe and the second conical tube are consistent; the spiral propeller includes a cylinder, a first spiral propeller blade and a second spiral propeller blade continuous with the first spiral propeller blade are spirally fixed on the cylinder, the outer contour of the first spiral propeller blade is conical and consistent with the taper of the pipe, and the outer contour of the second spiral propeller blade is conical and consistent with the taper of the second conical tube; a cavity located between the first spiral propeller blade and the second spiral propeller blade is provided on the cylinder, a material inlet is provided on the cavity, a material inlet pipe is provided in the cylinder, and a feed outlet located at the cavity is provided at the inner end of the material inlet pipe; a liquid outlet is provided on the left side of the first spiral propeller blade of the drum, and a slag discharge outlet is provided on the right side of the second spiral propeller blade of the drum. The liquid outlet of the horizontal screw centrifuge does not recover the odor or toxic gas from the clear liquid, so that the clear liquid containing the odor or toxic gas is collected and the normal separation liquid recovery standard cannot be achieved. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the above-mentioned prior art and provide a horizontal screw centrifuge with an odor extraction device at the liquid outlet, which separates the odor from the liquid in the clarified liquid through the negative pressure working principle, thereby meeting the demand that the odor or toxic gas in the clarified liquid can be stripped away, so that the discharged clarified liquid is cleaner.

[0005] The utility model adopts a technical solution to solve the technical problem: the horizontal screw centrifuge with an odor extraction device at a liquid outlet comprises a base, a cover shell is closed on the base, a drum is rotatably connected to the base, a spiral propeller is rotatably connected inside the drum and has a speed difference with the drum, a liquid outlet is provided on the base, and the odor extraction device is installed at the liquid outlet; the odor extraction device comprises a vertical cylinder, a connecting elbow is fixed to the middle of the odor extraction device, the inlet end of the connecting elbow is installed together with the liquid outlet, a first conical tube with a smaller upper portion and a larger lower portion is fixed to the top end of the vertical cylinder, a second conical tube with a smaller lower portion and a larger upper portion is fixed to the bottom end of the vertical cylinder, the top end of the first conical tube and the bottom end of the second conical tube are both fixed with mounting flanges; and an air pump is installed on the top mounting flange. The function of the odor extraction device here is to perform vacuum when the clear liquid is discharged, so that the odor or toxic gas in the clear liquid is separated from the clear liquid, so that the clear liquid discharged from the second cone tube is odorless, meets the qualified emission standards, and can also achieve the purpose of classified collection and treatment; the vacuum pump here can play the role of vacuuming the negative pressure on the top of the vertical cylinder.

[0006] Further improvements are made to the vertical cylinder, with a pair of upper and lower shelves fixed within. Both shelves are tilted upward, a first passageway is defined between the lower side shelf and the right inner wall of the vertical cylinder, and a second passageway is defined between the upper side shelf and the left inner wall of the vertical cylinder. Activated carbon plates are mounted on the tops of both shelves, and both shelves are located above the outlet of the connecting elbow. The purpose of the upward tilted shelves, the first passageway, and the second passageway is to create a vacuum in the upper portion of the vertical cylinder, thereby separating the exhaust and harmful gases in the clarified liquid and removing the odor and harmful gases in the clarified liquid.

[0007] As a further improvement, a baffle is fixed within the vertical cylinder, located below the outlet of the connecting elbow and arranged at a downward inclination. A third passage is provided between the baffle and the left inner wall of the vertical cylinder. The baffle, the downward inclination of the baffle, and the third passage ensure that the clarified liquid flowing out of the liquid outlet is retained within the vertical cylinder for a longer period of time, thereby achieving better extraction of odorous and toxic gases.

[0008] The beneficial effects of the utility model are:

[0009] 1). After the material is centrifuged, the clear liquid flowing out of the liquid outlet can be used to extract odor and toxic gases;

[0010] 2). It can filter odor and toxic gases with activated carbon to eliminate odor;

[0011] 3). It can prolong the retention time of the clear liquid, thereby achieving a better effect of extracting odor and toxic gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 The three-dimensional Figure 1 ;

[0014] Figure 3 The three-dimensional Figure 2 ;

[0015] Figure 4 It is a side view of the utility model;

[0016] Figure 5 This is a front view of the odor extraction device in the utility model;

[0017] Figure 6 This is a top view of the odor extraction device in the present invention;

[0018] Figure 7 It is a cross-sectional schematic diagram of the odor extraction device in the present invention.

[0019] Explanation of the reference numerals: base 1, cover 2, drum 3, screw propeller 4, odor extraction device 5, vertical cylinder 5-1, first cone tube 5-1a, second cone tube 5-1b, connecting elbow 5-2, mounting flange 5-3, shelf 6, first through channel 7, second through channel 8, activated carbon plate 9, baffle 10, third through channel 11, vacuum pump 12. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Referring to the accompanying drawings: This horizontal screw centrifuge with an odor extraction device at a liquid outlet comprises a base 1, a cover 2 is closed on the base 1, a drum 3 is rotatably connected to the base 1, a screw propeller 4 with a speed difference from that of the drum 3 is rotatably connected inside the drum 3, a liquid outlet 1-1 is provided on the base 1, and an odor extraction device 5 is installed at the liquid outlet 1-1; the odor extraction device 5 comprises a vertical cylinder 5-1, a connecting elbow 5-2 is fixed to the middle of the odor extraction device 5, the inlet end of the connecting elbow 5-2 is installed together with the liquid outlet 1-1, a first tapered tube 5-1a with a small upper part and a large lower part is fixed to the top of the vertical cylinder 5-1, a second tapered tube 5-1b with a small lower part and a large upper part is fixed to the bottom end of the vertical cylinder 5-1, the top of the first tapered tube 5-1a and the bottom of the second tapered tube 5-1b are both fixed with mounting flanges 5-3, and an air extractor 12 is installed on the top mounting flange 5-3.

[0022] A pair of upper and lower shelves 6 are fixed in the vertical cylinder 5-1. Both shelves 6 are set to be upwardly tilted. A first through channel 7 is opened between the lower side shelf 6 and the right inner wall of the vertical cylinder 5-1, and a second through channel 8 is opened between the upper side shelf 6 and the left inner wall of the vertical cylinder 5-1. Activated carbon plates 9 are installed on the top of the two shelves 6. Both shelves 6 are located above the outlet of the connecting elbow 5-2.

[0023] A baffle 10 is fixed inside the vertical cylinder 5-1. The baffle 10 is located below the outlet of the connecting elbow 5-2. The baffle 10 is tilted downward. A third passage 11 is opened between the baffle 10 and the left inner wall of the vertical cylinder 5-1.

[0024] The working principle of the utility model is as follows: when the spiral propeller 4 and the drum 3 are used to separate the solid and liquid of the material, the drum 3 and the spiral propeller 4 rotate at a certain differential speed in the same direction at a high speed, and the material is continuously introduced into the inner cylinder of the spiral propeller 4 from the material inlet pipe and accelerated into the drum 3. Under the action of strong centrifugal force, the heavier solid phase is deposited on the inner wall of the drum 3 to form a sediment layer. The spiral propeller blades on the spiral propeller 4 rotate and push the deposited solid phase continuously to the cone section of the drum 3 and pass through the slag discharge end. The clear liquid is discharged, and the clear liquid approaches the inner wall side of the drum 3 and continuously moves toward the right side and overflows through the liquid outlet at the other end of the drum 3, then enters the connecting elbow 5-2, and then enters the vertical cylinder 5-1. At this time, there is an air pump 12 running above the vertical cylinder 5-1, and the upper part of the vertical cylinder 5-1 is vacuumed and negatively pressurized. The clear liquid is slightly blocked by the baffle 10, which can effectively increase the retention time of the clear liquid in the vertical cylinder 5-1, thereby achieving better separation and treatment of odor and toxic gases (such as Figure 7 As shown), and activated carbon plates 9 are installed on the top of the two shelves 6, which can effectively eliminate odors, so that the clear liquid flowing out of the second cone tube 5-1b meets the discharge and recovery requirements, which is worthy of promotion and application.

[0025] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A horizontal screw centrifuge with an odor extraction device at a liquid outlet, comprising a base (1), a cover (2) covering the base (1), a drum (3) rotatably connected to the base (1), and a spiral propeller (4) rotatably connected to the drum (3) with a speed difference from that of the drum (3), wherein: The base (1) is provided with a liquid outlet (1-1), and an odor extraction device (5) is installed at the liquid outlet (1-1); The odor extraction device (5) comprises a vertical cylinder (5-1), a connecting elbow (5-2) is fixed in the middle of the odor extraction device (5), the inlet end of the connecting elbow (5-2) is installed together with the liquid outlet (1-1), a first cone tube (5-1a) with a small top and a large bottom is fixed at the top of the vertical cylinder (5-1), a second cone tube (5-1b) with a small bottom and a large top is fixed at the bottom of the vertical cylinder (5-1), and a mounting flange (5-3) is fixed at the top of the first cone tube (5-1a) and the bottom of the second cone tube (5-1b); an air extractor (12) is installed on the mounting flange (5-3) at the top.

2. The decanter centrifuge with a liquid outlet equipped with an odor extraction device according to claim 1, characterized in that: A pair of upper and lower shelves (6) are fixed in the vertical cylinder (5-1), and both shelves (6) are tilted upward. A first through passage (7) is opened between the lower shelf (6) and the right inner wall of the vertical cylinder (5-1), and a second through passage (8) is opened between the upper shelf (6) and the left inner wall of the vertical cylinder (5-1). Activated carbon plates (9) are installed on the top ends of the two shelves (6), and both shelves (6) are located above the outlet of the connecting elbow (5-2).

3. The decanter centrifuge with a liquid outlet equipped with an odor extraction device according to claim 2, characterized in that: A baffle (10) is fixed inside the vertical cylinder (5-1), the baffle (10) is located below the outlet of the connecting elbow (5-2), the baffle (10) is arranged to be tilted downward, and a third passage (11) is opened between the baffle (10) and the left inner wall of the vertical cylinder (5-1).

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