A biological pool recirculation gate device

Abstract

This utility model relates to the field of wastewater treatment technology, specifically to a backflow gate device in a biological treatment tank. It includes an internal backflow gate, a submersible jet mixer located in front of the gate, and a radar velocity meter located behind the gate. By measuring the flow velocity and related data from the radar velocity meter, the backflow ratio within the biological treatment tank can be quantitatively calculated. Controlling the opening of the internal backflow gate and the power of the submersible jet mixer effectively achieves precise regulation of the backflow ratio. Simultaneously, a water passage hole is provided on the wall below the internal backflow gate. The submersible jet mixer can be raised and lowered. When in the downward position, it engages with the water passage hole; when in the upward position, it engages with the internal backflow gate. This utility model provides more convenient and accurate regulation of backflow within the biological treatment tank during use. It also ensures the stability of equipment operation, and the degree of redundancy effectively avoids the risk of biological treatment tank shutdown, facilitating practical application in production.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a backflow gate device in a biological tank. Background Technology

[0002] In the biological wastewater treatment process, ammonia nitrogen in the wastewater undergoes nitrification in the aerobic tank, and then the nitrified liquid is returned to the anoxic tank to complete the denitrification process. In actual wastewater treatment, the above process is achieved through the arrangement of anoxic and aerobic corridors, as shown in the appendix to the instruction manual. Figure 1 As shown.

[0003] To control the nitrification liquor recirculation, i.e., the internal recirculation flow rate, an internal recirculation gate is installed at the water passage between the aerobic and anoxic tanks. The internal recirculation flow rate is controlled by the opening degree of the internal recirculation gate. However, in actual production and operation, since the valve opening degree and the internal recirculation flow rate are not linearly related, it is often necessary to make multiple and repeated adjustments when adjusting the internal recirculation flow rate. The gate adjustment is quite complicated, which increases the workload of internal recirculation adjustment and makes it difficult to ensure the accuracy of the adjustment.

[0004] In addition, in actual production, in order to ensure the stable operation of the equipment, it is necessary to regularly inspect and maintain the equipment. Taking the internal return gate as an example, it is necessary to conduct full-process opening and closing tests, etc. There are certain risks in the process. Since the internal return gate generally needs to maintain a certain opening degree in daily use, but in the full-process test, it will be adjusted to a smaller or larger opening degree. In the infrequently used position, the internal return gate may get stuck. Once the internal return gate gets stuck at a small opening degree, the nitrification liquid return flow will be less or interrupted, which will make the biological tank risk shutting down, and the resulting losses are incalculable.

[0005] Therefore, it is necessary to make certain modifications to the existing internal return gate. On the one hand, this will make the control of the internal return flow more convenient and accurate. On the other hand, through certain redundancy design, the operational risk of the internal return gate being blocked at a small opening will be reduced. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a biological pool internal recirculation gate device, so as to achieve quick and accurate control of internal recirculation flow and avoid the risk of biological pool shutdown when the internal recirculation gate is blocked at a small opening.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a biological pool internal reflux gate device, comprising an internal reflux gate, which is arranged on both sides and below the water passage from the aerobic pool to the anoxic pool of the biological pool. It also includes a flow propulsion device located in front of the internal reflux gate and a radar flow velocity meter located behind the internal reflux gate. The flow propulsion device includes a submersible flow propeller, which can be raised and lowered. A water passage hole is provided on the wall below the water passage. During the raising and lowering process, the submersible flow propeller can cooperate with the internal reflux gate and the water passage hole respectively.

[0008] Furthermore, the walls on both sides of the water passage are the first wall and the second wall, respectively, and the wall below the water passage is the third wall; an installation platform is provided between the first wall and the second wall, and an inner return gate is installed between the third wall and the installation platform. The upper part of the inner return gate is connected to the motor reducer on the installation platform, and the lower part of the inner return gate is supported by the third wall.

[0009] Furthermore, the water passage hole is located on the third wall.

[0010] Furthermore, the upper part of the submersible thruster is connected to a guide rod, the guide rod is connected to a lead screw, the lead screw is connected to a lead screw jack on the installation platform, and limit devices are provided on both sides of the lead screw below the installation platform to limit the rotation direction of the lead screw.

[0011] Furthermore, the limiting device includes a limiting rod, the upper end of which is fixedly connected to the lower part of the mounting platform, a limiting block is provided below the limiting rod, one end of the connecting rod is fixedly connected to the lead screw, and the other end of the connecting rod is connected to a limiting ring, which is sleeved on the limiting rod.

[0012] Furthermore, an upward limit switch is installed below the installation platform, and a downward limit switch is installed on one side above the screw jack. Mating blocks that cooperate with the upward and downward limit switches are respectively installed on the screw. The upward and downward limit switches are connected to a local PLC, which is connected to the screw jack. When the mating block above the screw touches the downward limit switch, the submersible thruster engages with the water passage hole. When the mating block below the screw touches the upward limit switch, the submersible thruster engages with the internal return gate.

[0013] The beneficial effects of this utility model are: it makes the control of the reflux in the biological tank more convenient and accurate during use, bringing convenience to the user, and also ensuring the stability of the equipment operation. The redundancy design can effectively avoid the risk of biological tank shutdown, making it easy to apply in actual production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the existing biological pool structure (with a schematic diagram of the installation position of the internal backflow gate) involved in this utility model;

[0015] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 3 This is a utility model Figure 2 Cross-sectional view of plane AA;

[0017] Figure 4 This is a schematic diagram of the submersible propeller structure of this utility model.

[0018] The names corresponding to each mark in the diagram:

[0019] 1. Anoxic tank; 2. Aerobic tank; 3. Internal reflux gate; 31. Motor reducer; 4. First wall; 5. Second wall; 6. Installation platform; 61. Radar flow meter; 7. Flow propulsion device; 71. Submersible flow propulsion device; 72. Guide rod; 73. Lead screw; 74. Lead screw jack; 75. Limiting device; 751. Limiting rod; 752. Limiting block; 753. Connecting rod; 754. Limiting ring; 8. Third wall; 9. Water passage hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0021] Embodiments of this utility model:

[0022] like Figure 1-4 As shown, in this embodiment, the backflow gate 3 is installed at the connection between the end of the aerobic tank 2 and the front end of the anoxic tank 1 in the biological pool.

[0023] In this embodiment, an installation platform 6 is provided on both sides of the water passage connecting the aerobic tank 2 to the anoxic tank 1. The two sides are a first wall 4 and a second wall 5, respectively. A third wall 8 is provided at the bottom of the water passage. An internal return gate 3 is located between the first wall 4 and the second wall 5. The lower part of the internal return gate 3 is connected to the third wall 8, and the upper part of the internal return gate 3 is connected to the motor reducer 31 above the installation platform 6.

[0024] A flow-pushing device 7 is provided on one side of the installation platform 6. The flow-pushing device 7 includes a submersible flow-pushing device 71. The upper part of the submersible flow-pushing device 71 is connected to a guide rod 72. The upper part of the guide rod 72 is connected to a lead screw 73. The lead screw 73 is connected to a lead screw jack 74 on the installation platform 6. A limit device 75 is provided below the installation platform 6 to cooperate with the lead screw 73. A limit rod 751 is provided in the limit device 75. The upper part of the limit rod 751 is fixedly connected to the lower part of the installation platform 6. A limit block 752 is provided below the limit rod 751. A connecting rod 753 is provided on the lead screw 73. The connecting rod 753 is connected to a limit ring 754. The limit ring 754 is sleeved on the limit rod 751.

[0025] A water passage hole 9 is provided on the third wall 8. During the up-and-down movement of the screw jack 74 driving the submersible thruster 71, it can cooperate with the water passage hole 9 and the inner return gate 3 respectively. In one embodiment of this utility model, an upward limit switch is provided below the installation platform 6 and a downward limit switch is provided on one side of the screw jack 74. The limit switches are connected to the field PLC. When the mating block on the screw contacts the limit switch, the up and down movement of the screw can be limited. In this embodiment, the downward position can be set to cooperate with the water passage hole 9, and the upward position can be set to cooperate with the inner return gate 3 (near the middle of the inner return gate 3).

[0026] In another embodiment of this utility model, a radar flow meter 61 is installed on the mounting platform 6. The radar flow meter 61 is used to monitor the flow velocity of the water behind the internal backflow gate 3.

[0027] The principle of this utility model is as follows:

[0028] During use, the internal recirculation ratio can be adjusted by controlling the opening of the internal recirculation gate 3 and the power of the submersible propeller 71 (the propeller is frequency-converted). In conjunction with the radar flow meter 61 (which is an existing device), the internal recirculation flow rate can be calculated and controlled by monitoring the water flow velocity, pool size, water level (a water level gauge is installed on site), and inlet flow rate.

[0029] In the traditional control process of the internal return gate 3, it is difficult to accurately control the internal return ratio because the gate opening and the internal return flow are not linear. Based on the opening of the internal return gate 3, the internal return ratio can be controlled by adjusting the submersible thruster 71. The two work together to achieve more accurate and convenient control.

[0030] In actual production, a certain amount of redundancy design is necessary to ensure the stability of process operation. The water passage hole 9 on the third wall 8 can also provide a certain amount of return flow when the gate is blocked (if the gate is blocked at a small opening during the whole process operation or test), avoiding the risk of the biological tank shutting down. However, the return flow that can be provided by the water passage hole 9 on the third wall 8 alone is limited. Therefore, the submersible thruster 71 can be lowered to the front end of the water passage hole 9 to further increase the return flow, which plays a positive role in ensuring the stable operation of the process.

[0031] This utility model involves a screw jack 74, a submersible thruster 71, a radar flow meter 61, and limit switches, all of which are existing and mature devices. This utility model does not make any improvements to these devices, so they will not be described in detail here.

Claims

1. A biological tank internal recirculation gate device, comprising an internal recirculation gate (3), wherein the internal recirculation gate (3) is arranged attached to the walls on both sides and below the water passage from the aerobic tank (2) to the anoxic tank (1) of the biological tank, characterized in that: It also includes a flow propulsion device (7) located in front of the inner return gate (3) and a radar flow meter (61) located behind the inner return gate (3); the flow propulsion device (7) includes a submersible flow propeller (71), which can be raised and lowered, and a water passage hole (9) is provided on the wall below the water passage. During the raising and lowering process, the submersible flow propeller (71) can cooperate with the inner return gate (3) and the water passage hole (9) respectively.

2. The biological pool recirculation gate device according to claim 1, characterized in that: The walls on both sides of the water passage are the first wall (4) and the second wall (5), respectively, and the wall below the water passage is the third wall (8); an installation platform (6) is set between the first wall (4) and the second wall (5), and the inner return gate (3) is installed between the third wall (8) and the installation platform (6). The upper part of the inner return gate (3) is connected to the motor reducer (31) on the installation platform (6), and the lower part of the inner return gate (3) is connected to the third wall (8).

3. The biological pool recirculation gate device according to claim 2, characterized in that: The water passage hole (9) is located on the third wall (8).

4. The biological pool recirculation gate device according to claim 2, characterized in that: The submersible thruster (71) is connected to the guide rod (72) at the top, the guide rod (72) is connected to the lead screw (73), the lead screw (73) is connected to the lead screw jack (74) on the mounting platform (6), and limit devices (75) are provided on both sides of the lead screw (73) below the mounting platform (6). The limit devices (75) limit the rotation direction of the lead screw (73).

5. The biological pool recirculation gate device according to claim 4, characterized in that: The limiting device (75) includes a limiting rod (751), the upper end of which is fixedly connected to the lower part of the mounting platform (6), a limiting block (752) is provided below the limiting rod (751), one end of the connecting rod (753) is fixedly connected to the lead screw (73), and the other end of the connecting rod (753) is connected to the limiting ring (754), which is sleeved on the limiting rod (751).

6. The biological pool recirculation gate device according to claim 4, characterized in that: An upward travel switch is provided below the installation platform (6), and a downward travel switch is provided on one side above the screw jack (74). A mating block is provided on the screw (73) to cooperate with the upward travel switch and the downward travel switch. The upward travel switch and the downward travel switch are respectively connected to the field PLC, and the field PLC is connected to the screw jack (74). When the mating block above the screw (73) touches the downward travel switch, the submersible thruster (71) cooperates with the water passage hole (9). When the mating block below the screw (73) touches the upward travel switch, the submersible thruster (71) cooperates with the internal return gate (3).

Images