Water treatment sludge tank discharge level control device and control method

Abstract

The present application relates to a kind of water treatment sludge tank discharge liquid level control device and control method, including outer sleeve, inner rotating cylinder and rotary drive device, wherein inner rotating cylinder is located in outer sleeve, rotary drive device is located on the upper end of outer sleeve, and the inner rotating cylinder is driven to rotate by the rotary drive device, one side of the outer sleeve is provided with discharge groove, multiple discharge holes are sequentially provided on the inner rotating cylinder along the height direction, and each discharge hole is located in the height range of the discharge groove, as seen along the axial direction of the inner rotating cylinder, each discharge hole is arranged at equal angle along the circumferential direction, and the highest discharge hole and the lowest discharge hole form drainage closed part between them.The liquid level regulating height range of the present application is greatly increased, and more flexible and accurate continuous discharge control can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a water treatment sludge tank discharge liquid level control device and control method. BACKGROUND

[0002] A large amount of sludge is generated during the operation of a sewage treatment plant. The main sources of sludge are the discharge of excess sludge from biochemical tanks and the physicochemical sludge generated by flocculation reaction. These sludge is discharged into a sludge storage tank for temporary storage. After a period of time, the supernatant is discharged to the front end of the system, and the settled sludge is sent to a sludge dewatering system for dewatering treatment. The traditional supernatant discharge is fixed level discharge. Generally, a sludge storage tank will have three levels of high, medium and low discharge ports. When discharging, the corresponding height of the discharge port valve needs to be opened according to the liquid level. However, the above fixed level discharge port structure can only control the discharge by controlling the opening of the discharge port, and it cannot achieve more accurate continuous control of the discharge. SUMMARY

[0003] The purpose of the present application is to provide a water treatment sludge tank discharge liquid level control device and control method, which greatly increases the liquid level adjustment height range and can achieve more flexible and accurate continuous discharge control.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] A water treatment sludge tank discharge liquid level control device, comprising an outer sleeve, an inner rotating cylinder and a rotating drive device, wherein the inner rotating cylinder is arranged in the outer sleeve, the rotating drive device is arranged on the upper end of the outer sleeve, and the inner rotating cylinder is driven to rotate by the rotating drive device, one side of the outer sleeve is provided with a discharge groove, a plurality of discharge holes are arranged on the inner rotating cylinder along the height direction in sequence, and each discharge hole is arranged within the height range of the discharge groove, and as viewed along the axial direction of the inner rotating cylinder, each discharge hole is arranged at equal angles along the circumferential direction, and a drainage closed part is formed between the highest discharge hole and the lowest discharge hole.

[0006] The upper end of the outer sleeve is provided with a mounting seat, and the rotating drive device is arranged on the mounting seat, the inner upper end of the inner rotating cylinder is provided with a rotating connecting piece, and the power shaft of the rotating drive device is fixedly connected with the rotating connecting piece after penetrating through the mounting seat.

[0007] A plurality of insertion blocks are arranged on the rotating connecting piece, and a plurality of insertion holes are arranged on the upper end of the inner rotating cylinder, and each insertion block is inserted into the corresponding insertion hole.

[0008] A drainage hole numbering disc is arranged in the mounting seat, and the drainage hole numbering disc is sleeved on the power shaft of the rotating drive device, and a transparent window is arranged on the upper side of the mounting seat for observing the display number of the drainage hole numbering disc.

[0009] The power shaft of the rotating drive device is sleeved with a first gear, a manual screw rod is rotatably arranged on the upper side of the mounting seat, and a second gear is sleeved on the manual screw rod, the first gear and the second gear are engaged, and the first gear and the second gear are arranged in the mounting seat.

[0010] The mounting seat comprises an upper cover plate, a connecting sleeve and a lower cover plate connected in sequence from top to bottom.

[0011] The edge of the discharge hole is provided with a discharge hole sealing ring, and the upper end and the lower end of the inner rotating cylinder are each provided with a sealing ring.

[0012] The upper end and the lower end of the outer sleeve are each provided with a flange.

[0013] The rotating drive device sends a signal to the control system through the sludge interface meter and the liquid level meter in the sludge pool to control rotation.

[0014] A control method of the water treatment sludge pool discharge liquid level control device, comprising the following steps:

[0015] Step one: compare the liquid level meter reading L2 with the initial calculated liquid level height L0 in the pool, the initial calculated liquid level height L0 in the pool is flush with the bottom edge of the highest drain (501), if L2 is greater than L0, proceed to the next calculation, otherwise continue to compare;

[0016] Step two: compare whether the difference between the two sludge interface meter readings L1 at the interval setting time is less than the set stable difference, if the difference between the two sludge interface meter readings L1 is less than the stable difference, proceed to the next calculation, otherwise continue to compare;

[0017] Step three: take the highest drain as the initial number 1, number each drain from top to bottom, and calculate the drain number N corresponding to the sludge interface meter reading L1 according to the following formula:

[0018] N = n - [(L1 - L3) / d1] (1);

[0019] In the above formula (1), [(L1 - L3) / d1] takes the integer part of the calculation result, and d1 is the height of a single drain;

[0020] In the above formula (1), L3 is the lowest discharge liquid level in the pool, and the lowest discharge liquid level L3 in the pool is flush with the bottom edge of the lowest drain, and L3 is calculated as follows:

[0021] L3 = L0 - d1 × (n - 1) (2);

[0022] In the above formula (1), n is the number of drains, and n is calculated as follows:

[0023] n = d2 / d1 (3);

[0024] In the above formula (3), d2 is the height of the slot of the outer sleeve;

[0025] Step four: the rotation driving device is started, and is rotated by c1+c2 degrees every set time t1, c1+c2 is the included angle of the adjacent two drainage ports, the rotation driving device is stopped after rotating the Nth time, and after the set time t2, the rotation driving device is reversely rotated to reset to the original position.

[0026] The advantages and positive effects of the present application are:

[0027] 1. The present application controls the rotation of the inner rotating cylinder through the rotation driving device, and the drainage port at the corresponding height of the inner rotating cylinder is exposed from the slot on one side of the outer sleeve to realize drainage, and the present application can be provided with multiple drainage ports along the height direction of the inner rotating cylinder, each drainage port is arranged in the height range of the slot, so that the entire slot height is covered, compared with the fixed liquid level discharge port mode in the prior art, the liquid level adjustment height range of the present application is greatly increased, and more flexible and accurate continuous discharge control can be realized.

[0028] 2. The present application can realize automatic control discharge, without too much human operation, and the automation level is greatly improved.

[0029] 3. The present application has compact overall structure, and can be integrally installed at a suitable position in the sludge pool. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a perspective view of the present application,

[0031] Figure 2 is Figure 1 is an exploded view of the present application,

[0032] Figure 3 is Figure 2 is an exploded view of the rotation driving device and the mounting seat in the present application,

[0033] Figure 4 is Figure 2 is an enlarged view of A in the present application,

[0034] Figure 5 is Figure 2 is a planar development view of the inner rotating cylinder in the present application,

[0035] Figure 6 is a use state view of the present application.

[0036] Among them, 1 is the rotary drive device, 2 is the mounting base, 201 is the upper cover plate, 2011 is the transparent window, 2012 is the manual screw hole, 202 is the drain outlet numbering plate, 203 is the first gear, 204 is the connecting sleeve, 205 is the lower cover plate, 206 is the second gear, 3 is the rotary connector, 301 is the insert block, 4 is the outer sleeve, 401 is the slot, 402 is the flange, 5 is the inner rotating cylinder, 501 is the drain outlet, 5011 is the drain outlet sealing ring, 502 is the sealing ring, 503 is the insertion hole, 6 is the sludge interface gauge, 7 is the level gauge, 8 is the discharge pipe, and 9 is the sludge tank. Detailed Implementation

[0037] The invention will now be described in further detail with reference to the accompanying drawings.

[0038] like Figures 1 to 6 As shown, the present invention includes an outer sleeve 4, an inner rotating sleeve 5, and a rotation drive device 1, wherein the inner rotating sleeve 5 is disposed within the outer sleeve 4, the rotation drive device 1 is disposed at the upper end of the outer sleeve 4, and the inner rotating sleeve 5 is driven to rotate by the rotation drive device 1, as shown. Figure 1 As shown, the outer sleeve 4 has a long, narrow slot 401 along its height direction on one side. The inner rotating cylinder 5 has multiple drain outlets 501 arranged sequentially along its height direction, with each drain outlet 501 located within the height range of the slot 401. Viewed along the axial direction of the inner rotating cylinder 5, the drain outlets 501 are arranged at equal angles along the circumference, i.e., as shown... Figure 5 As shown, when the inner rotating cylinder 5 unfolds into a plane, the drain outlets 501 are distributed in a stepped manner, and a drainage closure with a horizontal width of H is formed between the highest and lowest drain outlets 501. During operation, the rotary drive device 1 controls the rotation of the inner rotating cylinder 5 according to the liquid level in the sludge tank 9, causing the drain outlets 501 at corresponding heights on the inner rotating cylinder 5 to be exposed through the slot 401 on one side of the outer sleeve 4 to drain water. When the drainage closure rotates to the position of the slot 401, the drainage closure blocks the slot 401, and the invention stops draining. Figure 4 As shown, in this embodiment, there are five drain outlets 501 along the height direction of the inner rotating cylinder 5, and the included angle between each drain outlet 501 is 60° when viewed along the axial direction of the inner rotating cylinder 5.

[0039] like Figures 2 to 3 As shown, in this embodiment, the upper end of the outer sleeve 4 is provided with a mounting base 2, and the rotary drive device 1 is provided on the mounting base 2. The upper end of the inner rotating cylinder 5 is provided with a rotary connector 3, and the power shaft 101 of the rotary drive device 1 passes through the mounting base 2 and is fixedly connected to the rotary connector 3. The rotary connector 3 is driven to rotate by the rotary drive device 1, thereby driving the inner rotating cylinder 5 to rotate.

[0040] As shown in Figures 2 to 3 In this embodiment, four insertion blocks 301 are arranged in cross shape on the rotating connecting piece 3, and Figure 2 and Figure 5 As shown in the figure, four insertion holes 503 are arranged on the upper end of the inner rotating cylinder 5, and each insertion block 301 is inserted into the corresponding insertion hole 503, so as to realize the connection between the rotating connecting piece 3 and the upper end of the inner rotating cylinder 5.

[0041] As shown in Figures 2 to 3 In this embodiment, a drainage port number plate 202 is arranged in the mounting seat 2, and the drainage port number plate 202 is sleeved on the power shaft 101 of the rotating driving device 1. A transparent window 2011 is arranged on the upper side of the mounting seat 2 for observing the number displayed by the internal drainage port number plate 202.

[0042] As shown in Figures 2 to 3 In this embodiment, a first gear 203 is sleeved on the power shaft 101 of the rotating driving device 1. A manual screw rod is rotatably arranged on the upper side of the mounting seat 2, and a second gear 206 is sleeved on the manual screw rod. The first gear 203 and the second gear 206 are engaged. When the present application is powered off, the operator can rotate the manual screw rod by using a hexagonal wrench, and then manually adjust the angle of the inner rotating cylinder 5 through the torque transmission of the second gear 206 and the first gear 203. At this time, the rotating driving device 1 cooperates to adaptively rotate. When the present application is working normally, the manual screw rod is driven to rotate freely by the power shaft 101, which does not affect the adjustment of the inner rotating cylinder 5. The first gear 203 and the second gear 206 are arranged in the mounting seat 2.

[0043] As shown in Figures 2 to 3 In this embodiment, the mounting seat 2 includes an upper cover plate 201, a connecting sleeve 204 and a lower cover plate 205 connected in sequence from top to bottom, and the upper cover plate 201, the connecting sleeve 204 and the lower cover plate 205 enclose a cavity. The drainage port number plate 202, the first gear 203 and the second gear 206 are arranged in the cavity. The upper cover plate 201 is provided with the transparent window 2011 and a manual screw rod hole 2012 through which the manual screw rod passes.

[0044] As shown in Figure 5 In this embodiment, a drainage port sealing ring 5011 is arranged on the edge of the drainage port 501. In addition, as shown in Figure 2 The upper end and the lower end of the inner rotating cylinder 5 are both provided with a sealing ring 502, and the sealing ring 502 and the drainage port sealing ring 5011 are used to ensure the sealing between the inner rotating cylinder 5 and the outer sleeve 4.

[0045] As shown in Figure 2 As shown in the figure, flanges 402 are arranged on the upper end and the lower end of the outer sleeve 4.Figure 1 As shown, the flange 402 at the upper end of the outer sleeve 4 is fixedly connected to the mounting base 2, as... Figure 6 As shown, the flange 402 at the lower end of the outer sleeve 4 is connected to a drain pipe 8.

[0046] The working principle of this invention is as follows:

[0047] like Figure 6 As shown, during operation, the invention is placed in the sludge tank 9, and the rotary drive device 1 controls the rotation of the inner rotating cylinder 5 according to the liquid level in the sludge tank 9, causing the drain outlet 501 at the corresponding height on the inner rotating cylinder 5 to be exposed through the slot 401 on one side of the outer sleeve 4 to achieve drainage. When the drainage closure part rotates to the position of the slot 401, the drainage closure part blocks the slot 401, and the invention stops drainage. Figure 4 As shown, the present invention has multiple drain outlets 501 along the height direction of the inner rotating cylinder 5, and each drain outlet 501 is located within the height range of the slot 401, thereby covering the entire height of the slot 401. Therefore, compared with the fixed liquid level discharge outlet method in the prior art, the liquid level adjustment height range of the present invention is greatly increased, and more flexible and accurate continuous discharge control can be achieved.

[0048] like Figure 6 As shown, the sludge tank 9 is equipped with a sludge interface gauge 6 and a liquid level gauge 7. In this invention, the sludge interface gauge 6 and the liquid level gauge 7 send signals to the control system to control the rotation of the rotary drive device 1. The sludge interface gauge 6 is used to detect the height of the sludge-water interface, and the liquid level gauge 7 is used to detect the liquid level. The sludge interface gauge 6 and the liquid level gauge 7 are both technologies known in the art and are commercially available products.

[0049] like Figure 2 As shown, in this embodiment, the width of the slot 401 of the outer sleeve 4 is set to a2, and the height is d2, as follows: Figure 4 As shown, in this embodiment, the width of each drain outlet 501 is set to a1, and the height is set to d1. Furthermore, looking along the axial direction of the outer sleeve 4, the included angle between two adjacent drain outlets 501 is set to c1 + c2, where c1 is the included angle corresponding to the width a1 of the drain outlet 501, and c2 is the included angle corresponding to the gap a0 between two adjacent drain outlets 501. The above parameters have the following relationship:

[0050] 1. Since each drain outlet 501 covers the entire height of the slot 401, the number n of drain outlets 501 can be determined by the height d2 of the slot 401 and the height d1 of the drain outlets 501:

[0051] n = d2 / d1;

[0052] In this embodiment, the initial calculated liquid level height in the pool is L0, which is flush with the bottom edge of the highest drainage outlet 501. The lowest discharge liquid level in the pool is L3, which is flush with the bottom edge of the lowest drainage outlet 501. Thus, L3 = L0 - d1 x (n - 1).

[0053] L3 = L0 - d1 x (n - 1).

[0054] In this embodiment, the reading of the sludge interface meter 6 is L1, and the reading of the liquid level meter 7 is L2. The reading L2 of the liquid level meter 7 can be used to determine whether to start the automatic control program. When the reading L2 of the liquid level meter 7 is greater than L0, the automatic control program is started. The reading L1 of the sludge interface meter 6 can be used to determine whether the sludge deposition on the bottom of the pool is stable. If the difference between the readings L1 of the sludge interface meter 6 at two intervals of a set time is greater than a set stable difference, the sludge deposition is not stable. Only when the difference between the readings L1 of the sludge interface meter 6 at two intervals of a set time is less than a set stable difference, it is indicated that the sludge deposition is stable, and the next calculation can be started.

[0055] The control method of the present application comprises the following steps:

[0056] Step one: compare the reading L2 of the liquid level meter 7 with the initial calculated liquid level height L0 in the pool, which is flush with the bottom edge of the highest drainage outlet 501. If L2 is greater than L0, proceed to the next calculation, otherwise continue to compare.

[0057] Step two: compare whether the difference between the readings L1 of the sludge interface meter 6 at two intervals of a set time is less than a set stable difference. If the difference between the readings L1 of the sludge interface meter 6 is less than the stable difference, proceed to the next calculation, otherwise continue to compare.

[0058] Step three: number the drainage outlets 501 from top to bottom, taking the highest drainage outlet 501 as the initial number 1, and calculate the number N of the drainage outlet 501 corresponding to the reading L1 (i.e. the sludge-water interface) of the sludge interface meter 6 according to the following formula:

[0059] N = n - [(L1 - L3) / d1] (1);

[0060] In the above formula (1), [(L1 - L3) / d1] takes the integer part of the calculation result, and d1 is the height of a single drainage outlet 501.

[0061] In the above formula (1), L3 is the lowest discharge liquid level in the pool, which is flush with the bottom edge of the lowest drainage outlet 501. L3 is calculated as follows:

[0062] L3 = L0 - d1 x (n - 1) (2);

[0063] In the above formula (1), n is the number of drainage outlets 501, which is calculated as follows:

[0064] n = d2 / d1 (3);

[0065] In the above formula (3), d2 is the height of the slot 401 of the outer sleeve 4;

[0066] Step four: the rotation driving device 1 is started, and is rotated by c1+c2 degrees every set time t1, c1+c2 is the included angle of the adjacent two water discharge ports 501, the rotation driving device 1 is stopped after being rotated for the Nth time, and the rotation driving device 1 is reversely rotated to reset to the original position after a set time t2.

[0067] The following application example is listed for further illustration.

[0068] In the application example, the depth of the sewage pool 9 is 4.0 meters, the initial calculated liquid level height L0 in the pool is 2.6 meters, the height d2 of the slot of the outer sleeve 4 is 2 meters, the width a2 is 0.3 meters, the number of the water discharge ports 501 arranged on the inner rotating cylinder 5 is 5, the height d1 of a single water discharge port 501 is 0.4 meters, and the width a1 is 0.3 meters.

[0069] Step one: the reading L2 of the liquid level meter 7 obtained by the control system is 3.2 meters, L2>L0, and the automatic control program is started to calculate the next step;

[0070] Step two: the stable difference is set to 0.3 meters in the application example, the reading L1 of the sludge interface meter 6 is initially 2.8 meters, and the reading is 1.6 meters after half an hour, at this time, 2.8-1.6=1.2 meters>the stable difference 0.3 meters, and the next step is not calculated, and the reading L1 of the sludge interface meter 6 is 1.5 meters after another half an hour, at this time, 1.6-1.5=0.1 meters<the stable difference 0.3 meters, and the condition is met, and the next step is calculated;

[0071] Step three: the number N of the water discharge port 501 corresponding to the reading L1 of the sludge interface meter 6 (i.e. the water and sludge interface) is calculated:

[0072] The lowest discharge liquid level L3 in the pool is 2.6-0.4×(5-1)=1.0 meters;

[0073] The number of the water discharge ports 501 is 5, and thus:

[0074] N=5-[(1.5-1.0) / 0.4]=4.0, wherein [(1.5-1.0) / 0.4] takes the integer part of the calculation result as 1.0;

[0075] Step four: the rotation driving device 1 is started, and is rotated by 60° every 30 minutes, the water is discharged from the water discharge ports 501 1-4 from top to bottom in turn, a total of 4 times, and the rotation driving device 1 is reversely rotated to reset to the initial position after 30 minutes after the 4 times of rotation are completed.

Claims

1. A control method for a water treatment sludge pond effluent level control device, characterized by: The water treatment sludge pool discharge liquid level control device comprises an outer sleeve (4), an inner rotating cylinder (5) and a rotating drive device (1), wherein the inner rotating cylinder (5) is arranged in the outer sleeve (4), the rotating drive device (1) is arranged at the upper end of the outer sleeve (4), the inner rotating cylinder (5) is driven to rotate by the rotating drive device (1), one side of the outer sleeve (4) is provided with a slot (401), a plurality of drainage openings (501) are arranged on the inner rotating cylinder (5) in sequence along the height direction, each drainage opening (501) is arranged within the height range of the slot (401), and each drainage opening (501) is arranged at an equal angle along the circumferential direction as viewed along the axial direction of the inner rotating cylinder (5), and a drainage closing part is formed between the highest drainage opening (501) and the lowest drainage opening (501). The rotating drive device (1) sends a signal to a control system through a sludge interface meter (6) and a liquid level meter (7) in a sludge pool (9) to control rotation. The control method of the water treatment sludge pool discharge liquid level control device comprises the following steps: Step one: compare the liquid level meter (7) reading L2 with the initial calculated liquid level height L0 in the pool, the initial calculated liquid level height L0 in the pool is flush with the bottom edge of the highest drainage opening (501), if L2 is greater than L0, proceed to the next calculation, otherwise continue to compare; Step two: compare whether the difference between the two sludge interface meter (6) readings L1 at the interval set time is less than the set stable difference, if the difference between the two sludge interface meter (6) readings L1 is less than the set stable difference, proceed to the next calculation, otherwise continue to compare; Step three: take the highest drainage opening (501) as the initial number 1, number each drainage opening (501) from top to bottom, and calculate the drainage opening (501) number N corresponding to the sludge interface meter (6) reading L1 according to the following formula: N=n-[(L1-L3) / d1] (1); In the above formula (1), [(L1-L3) / d1] takes the integer part of the calculation result, and d1 is the height of a single drainage opening (501); In the above formula (1), L3 is the lowest discharge liquid level in the pool, and the lowest discharge liquid level L3 in the pool is flush with the bottom edge of the lowest drainage opening (501), and L3 is calculated as follows: L3=L0-d1×(n-1) (2); In the above formula (1), n is the number of drainage openings (501), and n is calculated as follows: n=d2 / d1 (3); In the above formula (3), d2 is the height of the slot (401) of the outer sleeve (4); Step four: start the rotating drive device (1), and rotate c1+c2 degrees every set time t1, c1+c2 is the included angle of two adjacent drainage openings (501), stop after the rotating drive device (1) rotates the Nth time, and then reverse the rotating drive device (1) to reset to the original position after a set time t2.

2. The control method of the water treatment sludge pond discharge level control apparatus according to claim 1, characterized by: The upper end of the outer sleeve (4) is provided with a mounting seat (2), and the rotating drive device (1) is arranged on the mounting seat (2), the inner end of the upper end of the inner rotating cylinder (5) is provided with a rotating connecting piece (3), and the power shaft (101) of the rotating drive device (1) penetrates through the mounting seat (2) and is fixedly connected with the rotating connecting piece (3).

3. The control method of the water treatment sludge pond discharge level control apparatus according to claim 2, characterized by: A plurality of insertion blocks (301) are arranged on the rotating connecting piece (3), and a plurality of insertion holes (503) are arranged on the upper end of the inner rotating cylinder (5), and each insertion block (301) is inserted into the corresponding insertion hole (503).

4. The control method of the water treatment sludge pond discharge level control apparatus according to claim 2, characterized by: A drainage hole numbering disc (202) is arranged in the mounting seat (2), the drainage hole numbering disc (202) is sleeved on the power shaft (101) of the rotating driving device (1), and a transparent window (2011) for observing the number displayed by the drainage hole numbering disc (202) is arranged on the upper side of the mounting seat (2).

5. The control method of the water treatment sludge pond discharge level control apparatus according to claim 2, characterized by: A first gear (203) is sleeved on the power shaft (101) of the rotating driving device (1), a manual screw rod is rotatably arranged on the upper side of the mounting seat (2), a second gear (206) is sleeved on the manual screw rod, the first gear (203) and the second gear (206) are engaged, and the first gear (203) and the second gear (206) are arranged in the mounting seat (2).

6. The control method of the water treatment sludge pond discharge level control apparatus according to claim 2, characterized by: The mounting seat (2) comprises an upper cover plate (201), a connecting sleeve (204) and a lower cover plate (205) connected in sequence from top to bottom.

7. The control method of the water treatment sludge pond discharge level control apparatus according to claim 1, characterized by: A drainage hole sealing ring (5011) is arranged on the edge of the drainage port (501), and a sealing ring (502) is arranged on the upper end and the lower end of the inner rotating cylinder (5).

8. The control method of the water treatment sludge pond discharge level control apparatus according to claim 1, characterized by: Flanges (402) are arranged on the upper end and the lower end of the outer sleeve (4).

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